cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Breakdown of the generalized Gibbs ensemble for current-generating quenches
Creators: name: Mierzejewski, Marcin
name: Prelovsek, Peter
name: Prosen, Tomaz
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We establish a relation between two hallmarks of integrable systems: the relaxation towards the generalized Gibbs ensemble (GGE) and the dissipationless charge transport. We show that the former one is possible only if the so called Mazur bound on the charge stiffness is saturated by local conserved quantities. As an example we show how a non--GGE steady state with a current can be generated in the one-dimensional model of interacting spinless fermions with a flux quench. Moreover an extended GGE involving the quasi-local conserved quantities can be formulated for this case.
The equation of state and symmetry energy of low density nuclear matter
Creators: name: Hagel, K.
name: Natowitz, J. B.
name: Röpke, G.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The symmetry energy of nuclear matter is a fundamental ingredient in the investigation of exotic nuclei, heavy-ion collisions and astrophysical phenomena. A recently developed quantum statistical (QS) approach that takes the formation of clusters into account predicts low density symmetry energies far above the usually quoted mean field limits. A consistent description of the symmetry energy has been developed that joins the correct low-density limit with values calculated from quasi-particle approaches valid near the saturation density. The results are confronted with experimental values for free symmetry energies and internal symmetry energies, determined at sub-saturation densities and temperatures below 10 MeV using data from heavy-ion collisions. There is very good agreement between the experimental symmetry energy values and those calculated in the QS approach
description: 16 pages, 10 figures. arXiv admin note: text overlap with arXiv:0908.2344
N2O Mass Flow Modelling: State-of-the-Art and The New Dual SPC Model
Creators: name:  SIMONE LA LUNA
name:   DAVIDE ZUIN
name:   FILIPPO MAGGI
name:   LUCA MAGNI
name:   NICOLA FOLETTI
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: GREEN PROPELLANT
MASS FLOW RATE
SELF-PRESSURIZATION
PROPULSION

description: In recent years it is becoming increasingly important to expand knowledge about green propulsion and develop the technology of self-pressurization, considering their potential to replace hydrazine. Among the family of green propellants, one promising candidate to replace hydrazine is Nitrous Oxide which owns an interesting property: self-pressurization. This added value makes Nitrous Oxide one of the most \'green\' propellants used in the new space market, where the miniaturization trend requires storability, simplicity, lightness, and reliability in terms of propulsion unit.1 In this paper a study on the mass flow behavior during the discharge process using Nitrous Oxide is presented. The research combines three interconnected aspects: an overview of mass flow rate models presents in the scientific panorama, the development of a new mathematical model, and a preliminary experimental validation. The proposed Dual SPC model offers improved accuracy, enhancing the design and performance optimization of hybrid rocket systems.
WA-L36. Letter from David Insall to Andrew Williamson
Creators: name: Insall, David
Publisher: name: Zenodo
Year: 2023

description: Sent from Sultan’s Armed Forces, Muscat 06/10/1972; © Williamson Collection Project Notes: letter canvassing Williamson for the role of Director of Antiquities and explaining the current situation in Oman. The Historical Association was formed in late 1971 with the aim to “protect Oman’s historical buildings and archaeological sites from the ravages of development”. The Association included government officials and ex-pats. There was a possible plan to form a government Department of Antiquities with funding (with a view to tourism development and heritage protection) and to establish a National Museum. The building earmarked for the National Museum was currently being used by the Ministry of Economy. The provisional plan was to appoint a distinguished Omani general with some historical knowledge to the post of Director of Antiquities and Head of the National Museum, but various members of the Oman Historical Association were keen to bring in someone with professional historical/archaeological training from Europe. Stronach suggested Williamson as a potentially suitable candidate. Insall was prepared to act as the interlocutor
Status of the Zee-Babu model for neutrino mass and possible tests at a like-sign linear collider
Creators: name: Schmidt, Daniel
name: Schwetz, Thomas
name: Zhang, He
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We provide an updated scan of the allowed parameter space of the two-loop Zee-Babu model for neutrino mass. Taking into account most recent experimental data on $μ\to eγ$ as well as the mixing angle $θ_{13}$ we obtain lower bounds on the masses of the singly and doubly charged scalars of between 1 to 2 TeV, with some dependence on perturbativity and fine-tuning requirements. This makes the scalars difficult to observe at LHC with 14 TeV even with optimistic assumptions on the luminosity, and would require a multi-TeV linear collider to see the scalar resonances. We point out, however, that a sub-TeV linear collider in the like-sign mode may be able to observe lepton flavour violating processes such as $e^- e^- \to μ^- μ^-$ due to contact interactions induced by the doubly charged scalar with masses up to around 10 TeV. We investigate the possibility to distinguish the Zee-Babu model from the Higgs triplet model using such processes.
description: 12 pages, 7 figures
Design of a 2-axis thrust stand for thrust vectoring diagnostics of an ECR thruster
Creators: name:  ETIENNE GOURCEROL
name:   VICTOR DESANGLES
name:   DENIS PACKAN
name:   FREDDY GABORIAU
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: ELECTRIC PROPULSION
ECR THRUSTER
THRUST VECTORING
2-AXIS THRUST STAND

description: The design of a 2-axis thrust stand for thrust vectoring diagnostics of an ECR thruster is presented. The instrument consists in two nulled dual pendulum stages. A mechanical model and the transfer function of a dual pendulum stage are computed to predict the response of the thrust stand. Only the actuation gain can increase the amplitude of the response, but the geometrical parameters and the mass repartition of the thrust stand as well as the rotational stiffness of the pivots can be tuned to increase the signal-to-noise ratios.
Gravitino Problem in Supergravity Chaotic Inflation and SUSY Breaking Scale after BICEP2
Creators: name: Nakayama, Kazunori
name: Takahashi, Fuminobu
name: Yanagida, Tsutomu T.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Gravitinos are generically produced by inflaton decays, which place tight constraints on inflation models as well as supersymmetry breaking scale. We revisit the gravitino production from decays of the inflaton and the supersymmetry breaking field, based on a chaotic inflation model suggested by the recent BICEP2 result. We study cosmological constraints on thermally and non-thermally produced gravitinos for a wide range of the gravitino mass, and show that there are only three allowed regions of the gravitino mass: $m_{3/2}\lesssim 16$eV, $m_{3/2}\simeq 10$--$1000$TeV and $m_{3/2}\gtrsim 10^{13}$GeV.
description: 18 pages, 1 figure
Repetitive Femtosecond Laser Energy deposition for Supersonic Flow Control
Creators: name:  PAUL QUENTIN ELIAS
name:   KHIAR
name:   SEVERAC
name:   MORILHAT
name:   LUYSSEN
name:   TOBELI
name:   BUR
name:   DOUDET
name:   WATTELLIER
name:   BIZET
name:   ANDRE
name:   MAHIEU
name:   MYSYROWICZ
name:   HOUARD
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: LASER
SUPERSONIC
ENERGY DEPOSITION
FEMTOSECOND

description: Laser energy deposition using femtosecond laser pulses can generate long (-50-60 mm) heated filaments. In a previous experiment, we have shown how these filaments can induce a significant transient reduction of the drag of a supersonic blunt-nose body. However, due to the low repetition rate of the laser, no cumulative or quasi-steady state effect was observed. ONERA, LOA and Phasics are preparing a new experiment using a state-of-the-art picosecond laser, which operates at 1 kHz. The goal of this new study is to investigate the effect of a repetitive energy deposition on the steady-state aerodynamic coefficients, especially the drag coefficient. This paper details the principles of this experiment and the first simulations obtained to prepare the test campaign, which should start this fall.
Nanoscale Imaging of High‐Field Magnetic Hysteresis in Meteoritic Metal Using X‐Ray Holography
Creators: name: Blukis, R.
name: Pfau, B.
name: Günther, Christian
name: Hessing, P.
name: Eisebitt, Stefan
name: Einsle, J.
name: Harrison, R. J.
Publisher: name: Technische Universität Berlin
Year: 2020
Subjects: subject: 550 Geowissenschaften
subject: X‐ray holography
subject: cloudy zone
subject: Tazewell meteorite

description: Stable paleomagnetic information in meteoritic metal is carried by the “cloudy zone”: ~1–10 μm‐wide regions containing islands of ferromagnetic tetrataenite embedded in a paramagnetic antitaenite matrix. Due to their small size and high coercivity (theoretically up to ~2.2 T), the tetrataenite islands carry very stable magnetic remanence. However, these characteristics also make it difficult to image their magnetic state with the necessary spatial resolution and applied magnetic field. Here, we describe the first application of X‐ray holography to image the magnetic structure of the cloudy zone of the Tazewell IIICD meteorite with spatial resolution down to ~40 nm and in applied magnetic fields up to ±1.1 T, sufficient to extract high‐field hysteresis data from individual islands. Images were acquired as a function of magnetic field applied both parallel and perpendicular to the surface of a ~100 nm‐thick slice of the cloudy zone. Broad distributions of coercivity are observed, including values that likely exceed the maximum applied field. Horizontal offsets in the hysteresis loops indicate an interaction field distribution with half width of ~100 mT between the islands in their room temperature single‐domain state, providing a good match to first‐order reversal curve diagrams. The results suggest that future models of remanence acquisition in the cloudy zone should take account of strong interactions in order to extract quantitative estimates of the paleofield.
Buoyancy and Penrose Process Produce Jets from Rotating Black Holes
Creators: name: Semenov, V. S.
name: Dyadechkin, S. A.
name: Heyn, M. F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: 85A04

description: The exact mechanism by which astrophysical jets are formed is still unknown. It is believed that necessary elements are a rotating (Kerr) black hole and a magnetised accreting plasma. We model the accreting plasma as a collection of magnetic flux tubes/strings. If such a tube falls into a Kerr black hole, then the leading portion loses angular momentum and energy as the string brakes, and to compensate for this loss, momentum and energy is redistributed to the trailing portion of the tube.} {We found that buoyancy creates a pronounced helical magnetic field structure aligned with the spin axis. Along the field lines, the plasma is centrifugally accelerated close to the speed of light. This process leads to unlimited stretching of the flux tube since one part of the tube continues to fall into the black hole and simultaneously the other part of the string is pushed outward. Eventually, reconnection cuts the tube, the inner part is filled with new material and the outer part forms a collimated bubble-structured relativistic jet. Each plasmoid can be considered like an outgoing particle in the Penrose mechanism: it carries extracted rotational energy away from the black hole while the falling part with the corresponding negative energy is left inside the ergosphere.
description: 10 pages, 5 figures
Region and Location Based Indexing and Retrieval of MR-T2 Brain Tumor Images
Creators: name: N, Krishna A
name: Prasad, B G
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: In this paper, region based and location based retrieval systems have been implemented for retrieval of MR-T2 axial 2-D brain images. This is done by extracting and characterizing the tumor portion of 2-D brain slices by use of a suitable threshold computed over the entire image. Indexing and retrieval is then performed by computing texture features based on gray-tone spatial-dependence matrix of segmented regions. A Hash structure is used to index all images. A combined index is adopted to point to all similar images in terms of the texture features. At query time, only those images that are in the same hash bucket as those of the queried image are compared for similarity, thus reducing the search space and time.
description: 10 pages
title: Textures Induced by the Coesite-Stishovite Transition and Implications for the Visibility of the X-Discontinuity
Creators: name: Krug, Matthias
name: Saki, Morvarid
name: Ledoux, Estelle
name: Gay, Jeffrey P.
name: Chantel, Julien
name: Pakhomova, Anna
name: Husband, Rachel
name: Rohrbach, Arno
name: Klemme, Stephan
name: Thomas, Christine
name: Merkel, Sébastien
name: Sanchez-Valle, Carmen
Publisher: name: University of Muenster, Institutional Repository MIAMI
Year: 2023
Subjects: subject: 550 Earth sciences

description: The coesite-stishovite phase transition is considered the most plausible candidate to explain the X-discontinuity observed at around 300 km depth in a variety of tectonic settings. Here, we investigate the microstructure in SiO2 across the coesite-stishovite transition in uniaxial compression experiments. We apply the multigrain crystallography technique (MGC) in a laser-heated diamond-anvil cell (LH-DAC) to identify the seismic signature of the transition and the amount of SiO2 in the mantle. While coesite displays weak lattice-preferred orientations (LPO) before the transition, stishovite develops strong LPO characterized by the alignment of [112] axes parallel to the compression direction. However, LPO has little effect on the impedance contrast across the transition, which is up to 8.8% for S-waves in a mid-ocean ridge basalt (MORB) composition at 300 km depth along a normal mantle geotherm, 10 GPa-1700 K. Therefore, 10–50 vol.% of a MORB component, corresponding to 0.6–3.2 vol.% SiO2, mechanically mixed with the pyrolytic mantle would be required to explain the range of impedance (and velocity) contrasts observed for the X-discontinuity. Based on the reflection coefficients computed for the coesite-stishovite transition, we show that the incidence angle or epicentral distance is critical for the detection of silica-containing lithologies in the upper mantle, with highest detection probabilities for small incidence angles. The intermittent visibility of the X-discontinuity may thus be explained by the seismic detectability of the coesite-stishovite transition rather than by absence of the transition or chemical heterogeneities in some specific tectonic settings.
description: Finanziert über die DEAL-Vereinbarung mit Wiley 2019-2022.
Correlations of magnetic features and the torsional pattern
Creators: name: Muraközy, J.
name: Ludmány, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The striking similarity between the cyclic equatorward migration of the torsional oscillation belts and the sunspot activity latitudes inspired several attempts to seek an explanation of the torsional phenomenon in terms of interactions between flux ropes and plasma motions. The aim of the present work is to examine the spatial and temporal coincidences of the torsional waves and the emergence of sunspot magnetic fields. The locations of the shearing latitudes have been compared with the distributions of certain sunspot parameters by using sunspot data of more than two cycles. The bulges of the sunspot number and area distributions tend to be loacted within the 'forward' belts close to their poleward shearing borders. A possible geometry of the magnetic and velocity field interacion is proposed.
description: 4 pages, 3 figures
title: Phytophthora on Alnus spp. (alders)
Creators: name: Marçais, Benoit
name: Husson, Claude
Publisher: name: Julius Kühn-Institut, Bundesforschungsinstitut für Kulturpflanzen, Quedlinburg
Year: 2012

description: JKI Data Sheets Plant Pests and Diagnosis; 2012/4
title: A note on pigs’ knowledge of hidden objects
Creators: name: Nawroth, Christian
name: Ebersbach, Mirjam
name: Borell, Eberhard Von
Publisher: name: Universität Kassel
Year: 2013
Subjects: subject: physical cognition
subject: object permanence
subject: transpositions
subject: domestic pig
subject: 630
subject: Wahrnehmung
subject: Gebrauchsgegenstand
subject: Kognitive Kompetenz
subject: Schwein

description: Im Origninal: Creative Commons Attribution 3.0 (CC BY 3.0)
Predicting Excitonic Gaps of Semiconducting Single Walled Carbon Nanotubes From a Field Theoretic Analysis
Creators: name: Konik, Robert M.
name: Sfeir, Matthew Y.
name: Misewich, James A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We demonstrate that a non-perturbative framework for the treatment of the excitations of single walled carbon nanotubes based upon a field theoretic reduction is able to accurately describe experiment observations of the absolute values of excitonic energies. This theoretical framework yields a simple scaling function from which the excitonic energies can be read off. This scaling function is primarily determined by a single parameter, the charge Luttinger parameter of the tube, which is in turn a function of the tube chirality, dielectric environment, and the tube's dimensions, thus expressing disparate influences on the excitonic energies in a unified fashion. We test this theory explicitly on the data reported in NanoLetters 5, 2314 (2005) and Phys. Rev. B. 82, 195424 (2010) and so demonstrate the method works over a wide range of reported excitonic spectra.
description: 8 pages, 3 figures, 2 tables
Intrinsic angular momentum for radiating spacetimes which agrees with the Komar integral in the axisymmetric case
Creators: name: Gallo, Emanuel
name: Moreschi, Osvaldo M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Here, we present a new definition of {intrinsic angular momentum} at future null infinity, based on the charge-integral approach. This definition is suitable for the general case of radiating spacetimes without symmetries, which does not suffer from supertranslations ambiguities. In the case of axial symmetry this new definition agrees with the Komar integral.
description: 11 pages
A Novel Hierarchical Ant based QoS aware Intelligent Routing Scheme for MANETS
Creators: name: Sensarma, Debajit
name: Majumder, Koushik
Publisher: name: arXiv
Year: 2013
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: MANET is a collection of mobile devices with no centralized control and no pre-existing infrastructures. Due to the nodal mobility, supporting QoS during routing in this type of networks is a very challenging task. To tackle this type of overhead many routing algorithms with clustering approach have been proposed. Clustering is an effective method for resource management regarding network performance, routing protocol design, QoS etc. Most of the flat network architecture contains homogeneous capacity of nodes but in real time nodes are with heterogeneous capacity and transmission power. Hierarchical routing provides routing through this kind of heterogeneous nodes. Here, routes can be recorded hierarchically, across clusters to increase routing flexibility. Besides this, it increases scalability and robustness of routes. In this paper, a novel ant based QoS aware routing is proposed on a three level hierarchical cluster based topology in MANET which will be more scalable and efficient compared to flat architecture and will give better throughput.
description: 15 pages, 7 figures. arXiv admin note: text overlap with arXiv:1308.2762
Design and development of the ATEMO atmosphere monitoring device.
Creators: name:  FEDERICO TOSON
name:   CARLO BETTANINI
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: EARTH OBSERVATION
AIR POLLUTION
LIGHT POLLUTION
BALLOONS
DRONES

description: The negative impact of climate change is now increasingly felt and discussed. The aerospace sector plays a key role in this issue by investing in research into monitoring technologies. It is in this context that the ATEMO project was born; this PhD project aims to design and assemble a device, which can be integrated on drones or stratospheric balloons, that can provide information, in a given area of interest, on the health of the surrounding vegetation and on light and atmospheric pollution, correlating these variables with each other and integrating existing satellite data. The first year of the study focused on the device assembly and its use for the evaluation of vegetation indices.
WA-L37. Letter from Beatrice de Cardi to Andrew Williamson 1972
Creators: name: de Cardi, Beatrice
Publisher: name: Zenodo
Year: 2023

description: Sent from Council for British Archaeology, London 08/10/1972; © Williamson Collection Project Notes: plans to start new survey in Qatar and Oman and request for Williamson to participate in Qatar. With project proposals attached
Operational Modeling Capacity in European Seas — An EuroGOOS Perspective and Recommendations for Improvement.
Creators: name: Capet, Arthur
name: Fernández, Vicente
name: She, Jun
name: Dabrowski, Tomasz
name: Umgiesser, Georg
name: Staneva, Joanna
name: Mészáros, Lőrinc
name: Campuzano, Francisco
name: Ursella, Laura
name: Nolan, Glenn
name: El Serafy, Ghada
Publisher: name: UNESCO/IOC
Year: 2020
Subjects: subject: Operational oceanography
subject: Ocean modeling
subject: Coastal modeling
subject: Marine services
subject: Ocean observations
subject: Numerical modeling
subject: Parameter Discipline::Physical oceanography

description: An overview of the current European capacity in terms of operational modeling of marine and coastal systems is presented. This overview is compiled from a survey conducted in 2018–2019 among members of EuroGOOS and its related network of Regional Operational Oceanographic Systems, addressing the purposes, context and technical specificities of operational modeling systems. Contributions to the survey were received from 49 organizations around Europe, which represent 104 operational model systems simulating mostly hydrodynamics, biogeochemistry and sea waves. The analysis of contributions highlights the strengths and weaknesses of the current capacity from an operational point of view, and leads to the formulation of recommendations toward the improvement of marine operational modeling services in Europe. In particular, this study highlights the heterogeneity of the European operational modeling capacity in terms of atmospheric and land boundary conditions, its limited deployment for biogeochemical phenomena, and a restricted use of data assimilation methods. In order to improve the accuracy of their simulations, model operators aim toward a further refinement of spatial resolution, and identify the quality and accessibility of forcing data and the suitability of observations for data assimilation as restricting factors. The described issues call for institutional integration efforts and promotion of good practices to homogenize operational marine model implementations, and to ensure that external forcing datasets, observation networks and process formulations and parameterizations are adequately developed to enable the deployment of high-level operational marine and coastal modeling services across Europe.
Poster: K-Nearest Neighbor Algorithm To Identify Cucumber Maturity With Extraction Of One-Order Statistical Features And GrayLevel Co-Occurrence
Creators: name: Syamsudduha Syahrorini
name: Syamsudin, Denny
name: Dwi Hadidjaja Rasjid Saputra
name: Akhmad Ahfas
Publisher: name: Zenodo
Year: 2020

description: This material presented in 2nd ICESE 2020
Molecular dynamics study of the stability of a carbon nanotube atop a catalytic nanoparticle
Creators: name: Verkhovtsev, Alexey V.
name: Schramm, Stefan
name: Solov'yov, Andrey V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: The stability of a single-walled carbon nanotube placed on top of a catalytic nickel nanoparticle is investigated by means of molecular dynamics simulations. As a case study, we consider the $(12,0)$ nanotube consisting of 720 carbon atoms and the icosahedral Ni$_{309}$ cluster. An explicit set of constant-temperature simulations is performed in order to cover a broad temperature range from 400 to 1200 K, at which a successful growth of carbon nanotubes has been achieved experimentally by means of chemical vapor deposition. The stability of the system depending on parameters of the involved interatomic interactions is analyzed. It is demonstrated that different scenarios of the nanotube dynamics atop the nanoparticle are possible depending on the parameters of the Ni-C potential. When the interaction is weak the nanotube is stable and resembles its highly symmetric structure, while an increase of the interaction energy leads to the abrupt collapse of the nanotube in the initial stage of simulation. In order to validate the parameters of the Ni-C interaction utilized in the simulations, DFT calculations of the potential energy surface for carbon-nickel compounds are performed. The calculated dissociation energy of the Ni-C bond is in good agreement with the values, which correspond to the case of a stable and not deformed nanotube simulated within the MD approach.
description: 11 pages, 5 figures; submitted to Eur. Phys. J. D
Multiphase MHD model for electric explosions: Application to lightning protection systems
Creators: name:  FABIEN THOLIN
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: MHD
PLASMA
CFD
LIGHTNING
EXPLOSION
PHASE TRANSITION

description: The electrical explosion of metals due to very fast energy deposition mechanisms (laser beam, Joule heating), is at the core of many applications such as lightning protections for aircraft, pulsed power technologies, nuclear fusion (Z machines) or directed energy weapons. However, the modelling of such explosions is very difficult to address since matter, initially in the solid state, may experience rapid phase transitions to liquid state, gas, supercritical state, and finally to plasma state. In addition, when dealing with practical applications, solid mechanics may play a crucial role in the confinement of the electrical explosions. To tackle this complex multiphysical phenomena, an MHD (MagnetoHydroDynamics) multiphase solver has been developed.
Traffic experiment reveals the nature of car-following
Creators: name: Jiang, Rui
name: Hu, Mao-Bin
name: Zhang, H. M.
name: Gao, Zi-You
name: Jia, Bin
name: Wu, Qing-Song
name: Wang, Bing
name: Yang, Ming
Publisher: name: arXiv
Year: 2014
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: As a typical self-driven many-particle system far from equilibrium, traffic flow exhibits diverse fascinating non-equilibrium phenomena, most of which are closely related to traffic flow stability and specifically the growth/dissipation pattern of disturbances. However, the traffic theories have been controversial due to a lack of precise traffic data. We have studied traffic flow from a new perspective by carrying out large-scale car-following experiment on an open road section, which overcomes the intrinsic deficiency of empirical observations. The experiment has shown clearly the nature of car-following, which runs against the traditional traffic flow theory. Simulations show that by removing the fundamental notion in the traditional car-following models and allowing the traffic state to span a two-dimensional region in velocity-spacing plane, the growth pattern of disturbances has changed qualitatively and becomes qualitatively or even quantitatively in consistent with that observed in the experiment.
description: 24 pages, 7 figures
Chemical evolution of classical and ultra-faint dwarf spheroidal galaxies
Creators: name: Vincenzo, Fiorenzo
name: Matteucci, Francesca
name: Vattakunnel, Shaji
name: Lanfranchi, Gustavo A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present updated chemical evolution models of two dwarf spheroidal galaxies (Sculptor and Carina) and the first detailed chemical evolution models of two ultra-faint dwarfs (Hercules and Boötes I). Our results suggest that the dwarf spheroidals evolve with a low efficiency of star formation, confirming previous results, and the ultra-faint dwarfs with an even lower one. Under these assumptions, we can reproduce the stellar metallicity distribution function, the $[α/Fe]$ vs. $[Fe/H]$ abundance patterns and the total stellar and gas masses observed at the present time in these objects. In particular, for the ultra-faint dwarfs we assume a strong initial burst of star formation, with the mass of the system being already in place at early times. On the other hand, for the classical dwarf spheroidals the agreement with the data is found by assuming the star formation histories suggested by the Color-Magnitude diagrams and a longer time-scale of formation via gas infall. We find that all these galaxies should experience galactic winds, starting in all cases before $1$ Gyr from the beginning of their evolution. From comparison with Galaxy data, we conclude that it is unlikely that the ultra-faint dwarfs have been the building blocks of the whole Galactic halo, although more data are necessary before drawing firm conclusions.
description: 19 pages, 14 figures, accepted for publication in MNRAS
title: Phytophthora on Betula spp. (birch)
Creators: name: Lilja, Arja
name: Thinggaard, Kirsten
name: Munda, Alenka
Publisher: name: Julius Kühn-Institut, Bundesforschungsinstitut für Kulturpflanzen, Quedlinburg
Year: 2012

description: JKI Data Sheets Plant Pests and Diagnosis; 2012/5
Superconducting properties of (Ba-K)Fe2As2 single crystals disordered with fast neutron irradiation
Creators: name: Karkin, A. E.
name: Wolf, T.
name: Goshchitskii, B. N.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Resistivity Rho(T), Hall coefficient RH(T), superconducting transition temperature Tc and slopes of the upper critical field dHc2/dT were studied in (Ba1-xKx)Fe2As2 (x = 0.218, 0.356, 0.531) single crystals irradiated with fast neutrons. It is found that dTc/dRhoSC - the rate of decreasing Tc as a function of the RhoSC (RHoSC is the resistivity at T = Tc) - linearly increases with concentration x. Slow changes in the Hall coefficient RH, as well as the quadratic electronic contribution to the resistivity, show that there are no substantial changes in the topology of the Fermi surface caused by irradiation. The slopes of the upper critical field dHc2/dT in ab- and c-directions as a function of RHoSC determined by Hall measurements show a reasonable agreement with a model that suggests constancy of the band parameters.
description: 6 pages, 8 figures
Step by Step instruction guide to assess fire events associated with agriculture using Remote Sensing and Geographical Information System (GIS) technique
Creators: name: Nair, Moorthy
Publisher: name: Zenodo
Year: 2023
Subjects: NASA, Fire, QGIS, VIIRS, MODIS

description: The document provides step-by-step instructions to visualize and retrieve fire events from satellite retrievals using NASA-FIRMS platforms. The guide also demonstrates step-by-step procedure to analyse the satellite retrieved information using QGIS software.
Questionário - Perfil de periódicos indexados LILACS Brasil 2023
Creators: name: BIREME
Publisher: name: Zenodo
Year: 2023
Subjects: periódicos científicos
LILACS
editores LILACS
periódicos LILACS

description: Perguntas enviadas para editores de periódicos indexados no LILACS, para realização do "Perfil dos periódicos indexados no LILACS", em agosto de 2023.
Perturbative Unitarity of Inflationary Models with Features
Creators: name: Cannone, Dario
name: Bartolo, Nicola
name: Matarrese, Sabino
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the pertubative consistency of inflationary models with features with effective field theory methods. By estimating the size of one-loop contributions to the three-point function, we find the energy scale where their contribution is of the same order of the tree-level amplitude. It is well-known that beyond that scale, perturbative unitarity is lost and the theory is no more under theoretical control. Requiring that all the relevant energy scales of the problem are below this cutoff, we derive a strong upper bound on the sharpness of the feature, or equivalently on its characteristic time scale, which is independent on the amplitude of the feature itself. We point out that the sharp features which seem to provide better fits to the CMB power spectrum are already outside this bound, questioning the consistency of the models that predict them.
Sexing up the international
Creators: name: Obendorf, Simon
Publisher: name: University of Lincoln
Year: 2023
Subjects: L400 - Social policy

description: This thesis takes sexuality as its subject matter and uses a methodology informed by postcolonial studies to explore new possibilities for thinking about the international, its construction, and its contemporary politics. I argue that postcolonial readings of sexuality can impel us to rethink the meanings and politics of international theory and to challenge notions that have come to appear fixed and unchanging. The thesis canvasses how such an intervention might occur – calling especially for a focus on the local and the everyday – and considers both the utility and the limits of the contributions sexuality might make to a rethinking of international theory. My arguments are made with reference to a series of specific examples from contemporary East and Southeast Asia: the nationalistically imbued gendered and sexed figures of the national serviceman and the Singapore Girl in Singapore; the political and social repercussions of the trial of former Malaysian Deputy Prime Minister Anwar Ibrahim on charges of sodomy; newly emerging homosexual identities in Hong Kong; and the connections between sexuality and disease that inform the Thai response to HIV/AIDS. These case studies exemplify some of the ways in which sexuality can work to recast traditional scholarly understandings of the international. They also illuminate a series of aspects that shape the encounter between sexuality and the international, encompassing issues of nationalism, globalization, metaphor, spatiality and knowledge politics. Through my analysis of these issues, I argue for a broadening out of the source materials that inform knowledge about the international and the pursuit of alternative modes of reading processes of international change and exchange. I contend that scholarship of the international needs to pay more attention to instances where the borders separating everyday, national and international spaces break down, and where we might detect new forms of knowledge about the nature, politics and functioning of the international realm.
On a class of $α$-para Kenmotsu manifolds
Creators: name: Srivastava, K.
name: Srivastava, S. K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53D15, 53C25

description: The purpose of this paper is to classify $α$-para Kenmotsu manifolds $M^3$ such that the projection of the image of concircular curvature tensor $L$ in one-dimensional linear subspace of $T_{p}(M^{3})$ generated by $ξ_{p}$ is zero.
description: 9 pages
On countable cofinality of definable chains in Borel partial orders
Creators: name: Kanovei, Vladimir
Publisher: name: arXiv
Year: 2013
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03E15

description: We prove that in some cases definable chains of Borel partial orderings are necessarily countably cofinal. This includes the following cases: analytic chains, ROD chains in the Solovay model, and $Σ^1_2$ chains in the assumption that $ω_1^{L[x]}
description: 6 pages
Clustering, fronts, and heat transfer in turbulent suspensions of heavy particles
Creators: name: Bec, Jeremie
name: Homann, Holger
name: Krstulovic, Giorgio
Publisher: name: arXiv
Year: 2014
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Heavy inertial particles transported by a turbulent flow are shown to concentrate in the regions where an advected passive scalar, such as temperature, displays very strong front-like discontinuities. This novel effect is responsible for extremely high levels of fluctuations for the passive field sampled by the particles that impacts the heat fluxes exchanged between the particles and the surrounding fluid. Instantaneous and averaged heat fluxes are shown to follow strongly intermittent statistics and anomalous scaling laws.
description: 4 pages, 5 figures
Transient grating spectroscopy of SF6 molecular vibrations
Creators: name: Ferré, Amélie
name: Staedter, David
name: Burgy, Frédéric
name: Dagan, Michal
name: Descamps, Dominique
name: Dudovich, Nirit
name: Petit, Stéphane
name: Soifer, Hadas
name: Blanchet, Valérie
name: Mairesse, Yann
Publisher: name: arXiv
Year: 2014
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Strong field transient grating spectroscopy has shown to be a very versatile tool in time-resolved molecular spectroscopy. Here we use this technique to investigate the high-order harmonic generation from SF6 molecules vibrationally excited by impulsive stimulated Raman scattering. Transient grating spectroscopy enables us to reveal clear modulations of the harmonic emission. This heterodyne detection shows that the harmonic emission generated between 14 to 26 eV is mainly sensitive to two among the three active Raman modes in SF6, i.e. the strongest and fully symmetric nu 1-A1g mode (774 cm-1, 43 fs) and the slowest mode nu5-T2g (524 cm-1, 63 fs). A time-frequency analysis of the harmonic emission reveals additional dynamics: the strength and central frequency of the nu 1 mode oscillate with a frequency of 52 cm-1 (640 fs). This could be a signature of the vibration of dimers in the generating medium. Harmonic 11 shows a remarkable behavior, oscillating in opposite phase, both on the fast (774 cm-1) and slow (52 cm-1) timescales, which indicates a strong modulation of the recombination matrix element as a function of the nuclear geometry. These results demonstrate that the high sensitivity of high-order harmonic generation to molecularvibrations, associated to the high sensitivity of transient grating spectroscopy, make their combination a unique tool to probe vibrational dynamics.
description: Journal of Physics B: Atomic, Molecular and Optical Physics (2014) special issue : Ultrafast electron and molecular dynamics
Estimation of causal effects using instrumental variables with nonignorable missing covariates: Application to effect of type of delivery NICU on premature infants
Creators: name: Yang, Fan
name: Lorch, Scott A.
name: Small, Dylan S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Understanding how effective high-level NICUs (neonatal intensive care units that have the capacity for sustained mechanical assisted ventilation and high volume) are compared to low-level NICUs is important and valuable for both individual mothers and for public policy decisions. The goal of this paper is to estimate the effect on mortality of premature babies being delivered in a high-level NICU vs. a low-level NICU through an observational study where there are unmeasured confounders as well as nonignorable missing covariates. We consider the use of excess travel time as an instrumental variable (IV) to control for unmeasured confounders. In order for an IV to be valid, we must condition on confounders of the IV---outcome relationship, for example, month prenatal care started must be conditioned on for excess travel time to be a valid IV. However, sometimes month prenatal care started is missing, and the missingness may be nonignorable because it is related to the not fully measured mother's/infant's risk of complications. We develop a method to estimate the causal effect of a treatment using an IV when there are nonignorable missing covariates as in our data, where we allow the missingness to depend on the fully observed outcome as well as the partially observed compliance class, which is a proxy for the unmeasured risk of complications. A simulation study shows that under our nonignorable missingness assumption, the commonly used estimation methods, complete-case analysis and multiple imputation by chained equations assuming missingness at random, provide biased estimates, while our method provides approximately unbiased estimates. We apply our method to the NICU study and find evidence that high-level NICUs significantly reduce deaths for babies of small gestational age, whereas for almost mature babies like 37 weeks, the level of NICUs makes little difference. A sensitivity analysis is conducted to assess the sensitivity of our conclusions to key assumptions about the missing covariates. The method we develop in this paper may be useful for many observational studies facing similar issues of unmeasured confounders and nonignorable missing data as ours.
description: Published in at http://dx.doi.org/10.1214/13-AOAS699 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Enhancement of the security of a practical continuous-variable quantum-key-distribution system by manipulating the intensity of the local oscillator
Creators: name: Ma, Xiang-Chun
name: Sun, Shi-Hai
name: Jiang, Mu-Sheng
name: Gui, Ming
name: Zhou, Yan-Li
name: Liang, Lin-Mei
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In a practical continuous-variable quantum-key distribution (CVQKD), the fluctuations of the local oscillator (LO) not only make the normalization of Bob's measurement outcomes difficult, but also can change the signal-to-noise ratio (SNR) of an imperfect balanced homodyne detector (BHD), which may lead the security of a practical system of CVQKD to be compromised severely. In this paper, we propose that the LO intensity can be manipulated by the legitimate parties, i.e., being tuned and stabilized to a required constant value, to eliminate the impact of LO fluctuations and defeat Eve's potential attack on the LO. Moreover, we show that the secret key rate can be increased over a noisy channel, especially the channels of metropolitan QKD networks, by tuning the intensity of LO and thus the SNR of a practical BHD to an optimal value, and we find that, counterintuitively, the requirement on BHD (i.e., high detection efficiency and low electronic noise) can also be reduced in this case. To realize this manipulation, we give a schematic setup which thus can be used to enhance the security of a practical CVQKD system.
description: 7 pages, 5 figures
Sociological approaches to the sexed running body and its construction through magazine and memory 1979-1995
Creators: name: Abbas, Andrea
Publisher: name: University of Lincoln
Year: 2023
Subjects: L216 - Feminism
L300 - Sociology

description: This thesis explores the transforming embodiment of sex that is integral to the development of running/jogging culture between 1979-1995. Actor-network theory, a foucauldian approach and critical realism are each used to elucidate different aspects of running including the way it defines sex through the body, clothing, space and the rules and practices of running, jogging and racing.
Effects of a uniform acceleration on atom-field interactions
Creators: name: Marino, Jamir
name: Noto, Antonio
name: Passante, Roberto
name: Rizzuto, Lucia
name: Spagnolo, Salvatore
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We review some quantum electrodynamical effects related to the uniform acceleration of atoms in vacuum. After discussing the energy level shifts of a uniformly accelerated atom in vacuum, we investigate the atom-wall Casimir-Polder force for accelerated atoms, and the van der Waals/Casimir-Polder interaction between two accelerated atoms. The possibility of detecting the Unruh effect through these phenomena is also discussed in detail.
description: 6 pages. Special Issue: 20th Central European Workshop on Quantum Optics - Stockholm - June 2013