cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Radio and X-ray Shocks in Clusters of galaxies
Creators: name: Hong, Sungwook E.
name: Kang, Hyesung
name: Ryu, Dongsu
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Radio relics detected in the outskirts of galaxy clusters are thought to trace radio-emitting relativistic electrons accelerated at cosmological shocks. In this study, using the cosmological hydrodynamic simulation data for the large-scale structure formation and adopting a diffusive shock acceleration (DSA) model for the production of cosmic-ray (CR) electrons, we construct mock radio and X-ray maps of simulated galaxy clusters that are projected in the sky plane. Various properties of shocks and radio relics, including the shock Mach number, radio spectral index and luminosity are extracted from the synthetic maps and compared with observations. A substantial fraction of radio and X-ray shocks identified in these maps involve multiple shock surfaces along line of sights (LoSs), and the morphology of shock distributions in the maps depends on the projection direction. Among multiple shocks in a given LoS, radio observations tend to pick up stronger shocks with flatter radio spectra, while X-ray observations preferentially select weaker shocks with larger kinetic energy flux. As a result, the shock Mach numbers and locations derived from radio and X-ray observations could differ from each other in some cases. We also find that the distributions of the spectral index and radio power of the synthetic radio relics are somewhat inconsistent with those of observed real relics; a bit more radio relics have been observed closer to the cluster core and with steeper spectral indices. We suggest the inconsistency could be explained, if very weak shocks with $M_s \la 2$ accelerate CR electrons more efficiently, compared to the DSA model adopted here.
description: accepted for publication in ApJ
Advancement of Additive Manufacturing for Monopropellant Catalyst Beds
Creators: name: Orth, Michael R
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: classificationCode: 400199
subject: Aerospace engineering not elsewhere classified

description: Monolithic catalyst beds have been used extensively in other industries and are gaining interest for space propulsion applications. Additive manufacturing of monolithic supports allows for catalyst beds with a wider range of geometries than could be produced using conventional methods, potentially allowing for higher performance monoliths that can compete with conventional packed beds in performance. Achieving these gains requires a consistent, even, and well-adhering washcoating procedure for the additively manufactured supports, one which works well on varied geometry and on support materials that can be readily printed. I conducted an extensive development process on improving methods of surface preparation and coating for high temperature ceramic monoliths that resulted in improvements in the state of the art. The materials and methods used are appropriate for rocket grade hydrogen peroxide, hydrazine, or other monopropellants with similar operating temperatures. Using existing published coating methods resulted in uneven coating distribution and poor adhesion. I demonstrate that this was due to the substrate surface morphology producing a hydrophobic effect. Surface morphology plays a significant role in coating coverage and adhesion and differences in initial support surfaces likely account for much of the variation in results seen across the literature. I present a method of controlled thermochemical surface etching using pure sodium hydroxide at 420°C that can reliably produce a roughened hydrophilic surface from a variety of starting morphologies. I also present several modifications to the primer formulation that improve evenness of coverage, the most significant of which is the inclusion of a surfactant at a concentration of 1 g per 36 g water. The surface treatment and coating formulation improvements combine well and produce an even coating with strong adhesion to the substrate. I also conducted preliminary work on the investigation of novel geometric designs for monolithic catalyst beds, and on the reactivity of different transition metal oxide catalysts for rocket grade hydrogen peroxide decomposition.
(Quasi)-exact-solvability on the sphere $S^n$
Creators: name: Miller,, Willard
name: Turbiner, Alexander V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 22E70, 16G99, 37J35, 37K10, 33C45, 17B60

description: An Exactly-Solvable (ES) potential on the sphere $S^n$ is reviewed and the related Quasi-Exactly-Solvable (QES) potential is found and studied. Mapping the sphere to a simplex it is found that the metric (of constant curvature) is in polynomial form, and both the ES and the QES potentials are rational functions. Their hidden algebra is $gl_n$ in a finite-dimensional representation realized by first order differential operators acting on $RP^n$. It is shown that variables in the Schrödinger eigenvalue equation can be separated in spherical coordinates and a number of the integrals of the second order exists assuring the complete integrability. The QES system is completely-integrable for $n=2$ and non-maximally superintegrable for $n\ge 3$. There is no separable coordinate system in which it is exactly solvable. We point out that by taking contractions of superintegrable systems, such as induced by Wigner-Inönü Lie algebra contractions, we can find other QES superintegrable systems, and we illustrate this by contracting our $S^n$ system to a QES non-maximal superintegrable system on Euclidean space $E^n$, an extension of the Smorodinsky-Winternitz potential.
description: 18 pages
title: Plasmas for High Speed Flow Control
Creators: name: Romain, Joussot
name: Sandra, Coumar
name: Viviana, Lago
Publisher: name: ONERA
Year: 2015
Subjects: RAREFIED SUPERSONIC FLOW
PLASMA FLOW CONTROL
ATMOSPHERIC ENTRY
ELECTRIC DISCHARGE
ARC JET
EXPERIMENTAL INVESTIGATION

description: This paper presents experimental activities focused on supersonic flow control with
plasma and MHD actuators. This work is carried out at ICARE, a laboratory located
at the CNRS Campus in Orleans. The study of aerothermodynamic physics, one of the
research fields of ICARE, is conducted with the experimental platform FAST consisting
of three supersonic/hypersonic wind tunnels involved in aerothermodynamic testing for
hypersonic flight and space technology.
description: AerospaceLab Journal, Issue 10, December 2015; ISSN: 2107-6596
title: Numerical Modeling of Dielectric Barrier Discharge Based Plasma Actuators for Flow Control : the COPAIER/CEDRE Example
Creators: name: Guillaume, Dufour
name: Francois, Rogier
Publisher: name: ONERA
Year: 2015
Subjects: PLASMA ACTUATORS
DIELECTRIC BARRIER DISCHARGE
FLOW CONTROL
NUMERICAL MODELING
COPAIER
CEDRE

description: Numerical simulation of active flow control using plasma actuators is dependent
upon the development of models accounting for the effects of the actuators on the
flow. These can be obtained either by using experimental results coupled with strong
assumptions regarding the plasma force distribution, or through numerical simulation.
The objective of this paper is to investigate the characteristics of DBD plasma source
terms obtained using direct numerical simulation. Using ONERA\'s in-house plasma
solver COPAIER, we propose an insight of a complete chain of numerical models,
ranging from the plasma discharge description to the computation of a DBD-induced
ionic wind.
description: AerospaceLab Journal, Issue 10, December 2015; ISSN: 2107-6596
title: Analyse der Yosys Prozesse, die Verilog in die interne Datenstruktur RTLIL konvertieren
Creators: name: Parnow, Christopher
Publisher: name: Hochschulbibliothek der Technischen Hochschule Köln
Year: 2022
Subjects: subject: 000 Allgemeines, Informatik, Informationswissenschaft
subject: 600 Technik, Medizin, angewandte Wissenschaften

description: Das Ziel der vorliegenden Arbeit besteht darin, die Frage zu beantworten wie Yosys Verilog einliest und daraus RTLIL generiert. Mit der Beantwortung dieser Frage, soll die Datenstruktur RTLIL und die Verknüpfung zu einem Verilog Design besser verstanden werden. Dafür wurde das Frontend von Yosys untersucht und die Datenstruktur RTLIL näher eleuchtet. Als Ergebnis konnte festgehalten werden, dass die AstNode Datenstruktur eine wesentliche Rolle bei der Konvertierung von Verilog zu RTLIL spielt, und mit deren Hilfe beim Einlesen ein abstrakter Syntaxbaum gebildet wird. Allein der Typ des Knotens beeinflusst, wie der RTLIL Generator damit umgeht. Weiter ist die Generierung von RTLIL::Cell Objekten als erster Schritt zur Synthese zu verstehen, da sie durch Technologie Mapping reale Komponenten abbilden können
description: The aim of this thesis is to answer the question of how Yosys reads Verilog and generates RTLIL. By answering this question, the data structure RTLIL and the link to a hardware design written in Verilog should be better understood. For this purpose, the front end of Yosys and the data structure RTLIL was examined more closely. The result of this analysis is that the AstNode structure plays an essential role in the conversion from Verilog to RTLIL and is used to form an abstract syntax tree during read in. Only the type of the node influences how the RTLIL generator handles it. Furthermore, the generation of RTLIL::Cell objects are to be understood as a first step towards synthesis, as they can introduce real components by means of technology mapping.
Liquid crystalline growth within a phase-field crystal model
Creators: name: Tang, Sai
name: Praetorius, Simon
name: Backofen, Rainer
name: Voigt, Axel
name: Yu, Yan-Mei
name: Wang, Jincheng
Publisher: name: arXiv
Year: 2015
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: By using a phase-field crystal (PFC) model, the liquid-crystal growth of the plastic triangular phase is simulated with emphasis on crystal shape and topological defect formation. The equilibrium shape of a plastic triangular crystal (PTC) grown from a isotropic phase is compared with that grown from a columnar/smectic A (CSA) phase. While the shape of a PTC nucleus in the isotropic phase is almost identical to that of a classical PFC model, the shape of a PTC nucleus in CSA is affected by the orientation of stripes in the CSA phase, and irregular hexagonal, elliptical, octagonal, and rectangular shapes are obtained. Concerning the dynamics of the growth process we analyse the topological structure of the nematic-order, which starts from nucleation of $+\frac{1}{2}$ and $-\frac{1}{2}$ disclination pairs at the PTC growth front and evolves into hexagonal cells consisting of $+1$ vortices surrounded by six satellite $-\frac{1}{2}$ disclinations. It is found that the orientational and the positional order do not evolve simultaneously, the orientational order evolves behind the positional order, leading to a large transition zone, which can span over several lattice spacings.
description: 8 pages; 8 figures
New insights into the problem with a singular drift term in the complex Langevin method
Creators: name: Nishimura, Jun
name: Shimasaki, Shinji
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The complex Langevin method aims at performing path integral with a complex action numerically based on complexification of the original real dynamical variables. One of the poorly understood issues concerns occasional failure in the presence of logarithmic singularities in the action, which appear, for instance, from the fermion determinant in finite density QCD. We point out that the failure should be attributed to the breakdown of the relation between the complex weight that satisfies the Fokker-Planck equation and the probability distribution associated with the stochastic process. In fact, this problem can occur in general when the stochastic process involves a singular drift term. We show, however, in a simple example that there exists a parameter region in which the method works although the standard reweighting method is hardly applicable.
description: 4 pages, 2 figures; (v2) comments added, final version published in PRD
title: Applications of Dielectric Barrier Discharges and Plasma Synthetic Jet Actuators at ONERA
Creators: name: Francois, Chedevergne
name: Gregoire, Casalis
name: Olivier, Leon
name: Maxime, Forte
name: Francois, Laurendeau
name: Natacha, Szulga
name: Olivier, Vermeersch
name: Estelle, Piot
Publisher: name: ONERA
Year: 2015
Subjects: PLASMA ACTUATOR
DBD
DIELECTRIC BARRIER DISCHARGE
PSJ
PLASMA SYNTHETIC JET
FLOW CONTROL

description: This paper focuses on two plasma actuators, developed at ONERA: the DBD actuator
(Dielectric Barrier Discharge) and the PSJ actuator (Plasma Synthetic Jet). At
the DMAE (Modeling for Aerodynamics and Energetics Department), DBD actuation is
investigated for laminar/transition purposes. The results presented deal with 2D configurations
including both experimental and modeling works. As regards the activities
on the PSJ actuator, most of the work is dedicated to the detailed characterization of
the general physics involved in such an actuator. Similarly to the DBD activities, both
experimental and modeling investigations are performed in order to be able to develop
efficient control strategies using the PSJ actuator.
description: AerospaceLab Journal, Issue 10, December 2015; ISSN: 2107-6596
CUESTIONARIO SOBRE ESTRÉS Y ESTRATEGIAS DE AFRONTAMIENTO DE LOS PROFESIONALES DE ENFERMERÍA
Creators: name: Franco, Eduardo
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 520304
subject: Health psychology

description: Spanish research instrument used in the research called: Psychometric properties of the Brief-COPE Inventory and factors associated with COVID-19-related perceived stress in Peruvian nurses
The myth of the Digital Earth between fragmentation and wholeness
Creators: name: Ballatore, Andrea
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Daring predictions of the proximate future can establish shared discursive frameworks, mobilize capital, and steer complex processes. Among the prophetic visions that encouraged and accompanied the development of new communication technologies was the "Digital Earth," described in a 1998 speech by Al Gore as a high-resolution representation of the planet to share and analyze detailed information about its state. This article traces a genealogy of the Digital Earth as a techno-scientific myth, locating it in a constellation of media futures, arguing that a common subtext of these envisionments consists of a dream of wholeness, an afflatus to overcome perceived fragmentation among humans, and between humans and the Earth.
description: Web: http://wi.mobilities.ca/myth-of-the-digital-earth
Signal from noise retrieval from one and two-point Green's function - comparison
Creators: name: Drogosz, Zbigniew
name: Jurkiewicz, Jerzy
name: Łukaszewski, Grzegorz
name: Nowak, Maciej A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Applications (stat.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We compare two methods of eigen-inference from large sets of data, based on the analysis of one-point and two-point Green's functions, respectively. Our analysis points at the superiority of eigen-inference based on one-point Green's function. First, the applied by us method based on Pad?e approximants is orders of magnitude faster comparing to the eigen-inference based on uctuations (two-point Green's functions). Second, we have identified the source of potential instability of the two-point Green's function method, as arising from the spurious zero and negative modes of the estimator for a variance operator of the certain multidimensional Gaussian distribution, inherent for the two-point Green's function eigen-inference method. Third, we have presented the cases of eigen-inference based on negative spectral moments, for strictly positive spectra. Finally, we have compared the cases of eigen-inference of real-valued and complex-valued correlated Wishart distributions, reinforcing our conclusions on an advantage of the one-point Green's function method.
description: 14 pages, 8 figures, 3 tables
Real-time quantum trajectories for classically allowed dynamics in strong laser fields
Creators: name: Plimak, L. I.
name: Ivanov, Misha Yu.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Both the physical picture of the dynamics of atoms and molecules in intense infrared fields and its theoretical description use the concept of electron trajectories. Here we address a key question which arises in this context: Are distinctly quantum features of these trajectories, such as the complex-valued coordinates, physically relevant in the classically allowed region of phase space, and what is their origin? First, we argue that solutions of classical equations of motion can account for quantum effects. To this end, we construct an exact solution to the classical Hamilton-Jacobi equation which accounts for dynamics of the wave packet, and show that this solution is physically correct in the limit $\hbar \to 0$. Second, we show that imaginary components of classical trajectories are directly linked to the finite size of the initial wavepacket in momentum space. This way, if the electronic wavepacket produced by optical tunneling in strong infrared fiels is localised both in coordinate and momentum, its motion after tunneling {\em ipso facto\/} cannot be described with purely classical trajectories -- in contrast to popular models in the literature.
description: Submitted to J. Mod. Opt
Nodal solutions for the Choquard equation
Creators: name: Ghimenti, Marco
name: Van Schaftingen, Jean
Publisher: name: arXiv
Year: 2015
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35J91, 35J20

description: We consider the general Choquard equations $$ -Δu + u = (I_α\ast |u|^p) |u|^{p - 2} u $$ where $I_α$ is a Riesz potential. We construct minimal action odd solutions for $p \in (\frac{N + α}{N}, \frac{N + α}{N - 2})$ and minimal action nodal solutions for $p \in (2,\frac{N + α}{N - 2})$. We introduce a new minimax principle for least action nodal solutions and we develop new concentration-compactness lemmas for sign-changing Palais--Smale sequences. The nonlinear Schrödinger equation, which is the nonlocal counterpart of the Choquard equation, does not have such solutions.
description: 23 pages, revised version with additional details and symmetry properties of odd solutions
title: Mechanisms of Ethylene Flame Propagation Enhancement by O2(a1g)
Creators: name: Timothy, Ombrello
name: Nikolay, Popov
Publisher: name: ONERA
Year: 2015
Subjects: SINGLET DELTA OXYGEN (O2(A1G))
FLAME SPEED ENHANCEMENT
PLASMA-ASSISTED COMBUSTION
QUENCHING RATES
KINETIC MECHANISM

description: Recently estimated and updated quenching rates of O2(a1g) by H and H2 have been
added to a known and validated combustion mechanism to predict enhancement
of C2H4 flame propagation in the presence of O2(a1g). The results of experiments that
targeted the isolated enhancement of O2(a1g) on C2H4 flame propagation were used
as a means to compare the effects of different chain-initiation, chain-branching, and
quenching rates. The ratio of chain-branching to quenching rates of 0.25 to 0.33 for
H+O2(a1g) was found to accurately predict the enhancement trends found in the C2H4
flame propagation experiments. The results suggest that flame propagation enhancement
of hydrocarbon fuels may not be strongly dependent on the reactions of intermediate
hydrocarbon fragments with O2(a1g) since the dominant pathways may solely lie with
primary radicals such as H.
description: AerospaceLab Journal, Issue 10, December 2015; ISSN: 2107-6596
Rigid Supersymmetry from Conformal Supergravity in Five Dimensions
Creators: name: Pini, Alessandro
name: Rodriguez-Gomez, Diego
name: Schmude, Johannes
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the rigid limit of 5d conformal supergravity with minimal supersymmetry on Riemannian manifolds. The necessary and sufficient condition for the existence of a solution is the existence of a conformal Killing vector. Whenever a certain $SU(2)$ curvature becomes abelian the backgrounds define a transversally holomorphic foliation. Subsequently we turn to the question under which circumstances these backgrounds admit a kinetic Yang-Mills term in the action of a vector multiplet. Here we find that the conformal Killing vector has to be Killing. We supplement the discussion with various appendices.
description: 23 pages
title: Experiments on Plasma-Assisted Combustion in a Supersonic Flow : Optimization of Plasma Position in Relation to the Fuel Injector
Creators: name: Konstantin, Savelkin
name: Dimitry, Yarantsev
name: Sergey B, Leonov
Publisher: name: ONERA
Year: 2015
Subjects: PLASMA-ASSISTED COMBUSTION
SUPERSONIC COMBUSTOR
INJECTION-IGNITION MODULE
TDLAS MEASUREMENTS

description: The results of an experimental study of plasma-induced ethylene ignition and
flameholding in a supersonic model combustor are presented in the paper. The
experimental combustor has a cross-section of 72 mm (width) x 60 mm (height)
and length of 600 mm. The fuel is directly injected into the supersonic airflow
through wall orifices. The flow parameters are : Mach number M=2, static pressure
Pst=160-250 Torr, stagnation temperature T0=300 K and total air flow rate Gair0.9
kg/s. The near-surface quasi-DC electrical discharge is generated by a series of
flush-mounted electrodes, providing an electrical power deposition of Wpl=3-24kW.
The scope of the experiments includes the characterization of the discharge interacting
with the main flow and fuel injection jet, a parametric study of ignition and flame
front dynamics and a comparison of three plasma generation schemes: the first two
examine upstream and downstream locations of plasma generators in relation to the
fuel injectors. The third pattern follows a novel approach of a combined mixing/ignition
technique, where the electrical discharge is distributed along the fuel jet, starting
within the fuel injector. The last pattern demonstrates a significant advantage in terms
of the flameholding limit. The experiments are supported by gas temperature and H2O
vapor concentration measurements by Tunable Diode-Laser Absorption Spectroscopy
(TDLAS). The technique studied in this work has weighty potential for high-speed combustion
applications, including cold start/restart of scramjet engines and support of the
transition regime in a dual-mode scramjet and during off-design operation.
description: AerospaceLab Journal, Issue 10, December 2015; ISSN: 2107-6596
Decay of transverse correlations in quantum Heisenberg models
Creators: name: Björnberg, Jakob E.
name: Ueltschi, Daniel
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We study a class of quantum spin systems that includes the $S=\tfrac12$ Heisenberg and XY-models, and prove that two-point correlations exhibit exponential decay in the presence of a transverse magnetic field. The field is not necessarily constant, it may be random, and it points in the same direction. Our proof is entirely probabilistic and it relies on a random-loop-representation of the correlation functions, on stochastic domination, and on first-passage percolation.
description: 9 pages
On reflected Stratonovich stochastic differential equations
Creators: name: Slominski, Leszek
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H20, 60G17

description: We study the problem of existence, uniqueness and approximation of solutions of finite dimensional Stratonovich stochastic differential equations with reflecting boundary condition driven by semimartingales with jumps. As an application we generalize known results on the Wong-Zakai type approximations.
title: Легкая атлетика для начинающих
Creators: name: ELS IPR BOOKS
Publisher: name: Новосибирский государственный университет экономики и управления «НИНХ»
Year: 2021

description: В учебно-методическом пособии представлены основы легкой атлетики, в частности ходьбы, бега и прыжка для начинающих. Издание содержит теоретические положения направлений легкой атлетики, иллюстрированные подводящие и базовые упражнения, направленные на освоение техники бега, ходьбы и прыжка, а также программы комплексных тренировок. Издание адресовано студентам, изучающим дисциплину «Элективные дисциплины по физической культуре и спорту» по направлению «Легкая атлетика» для очной, очно-заочной и заочной форм обучения.
title: Ignition of Lean Air / Hydrocarbon Mixtures at Low Temperature by a Single Corona Discharge Nanosecond Pulse
Creators: name: Sabrina, Bentaleb
name: Nicole, Blin-Simiand
name: Pascal, Jeanney
name: Lionel, Magne
name: Nicolas, Moreau
name: Stephane, Pasquiers
name: Pierre, Tardiveau
Publisher: name: ONERA
Year: 2015
Subjects: NANOSECOND CORONA DISCHARGE
LOW TEMPERATURE PLASMA
IGNITION
PROPANE
N-HEPTANE

description: A great number of experimental studies have demonstrated that non-thermal plasmas
produced by high voltage pulse discharges, running at a given pulse repetition
frequency, are able to ignite air / hydrocarbon mixtures at a low initial temperature and
atmospheric pressure. In this paper, we show that ignition can also be achieved using
a single nanosecond pulse corona discharge generated under a very strong overvoltage.
Experiments were conducted in air / propane and air / n-heptane mixtures. For
such a discharge, ignition of n-heptane requires less released electrical energy than
propane and lean mixtures can be completely burnt with reasonable energy values of
several tens of mJ. Extended flame kernels or several points of ignition can be induced.
For n-heptane, we have developed a simplified combustion model using a reduced mechanism,
enabling us to suggest a kinetic explanation for ignition at a low temperature.
In particular, it appears that oxygen atoms produced in the plasma induce a significant
reduction of the ignition time. This model lays the foundation for a more complete
study, including the production of other active species by the discharge, such as the
first excited state of the oxygen atom, or even dissociation products of the hydrocarbon
molecule following electron collisions or quenching of the nitrogen excited states.
description: AerospaceLab Journal, Issue 10, december 2015; ISSN: 2107-6596
Magic distances in the blockade mechanism of Rydberg p and d states
Creators: name: Vermersch, Benoît
name: Glaetzle, Alexander W.
name: Zoller, Peter
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that the Rydberg blockade mechanism, which is well known in the case of s states, can be significantly different for p and d states due to the van der Waals couplings between different Rydberg Zeeman sublevels and the presence of a magnetic-field. We show, in particular, the existence of magic distances corresponding to the laser-excitation of a superposition of doubly excited states.
description: 14 pages
Extraordinary acoustic transmission via supercoupling and self-interference cancellation
Creators: name: Byrne, Matthew Scott
Publisher: name: The University of Texas at Austin
Year: 2021
Subjects: Supercoupling
Metamaterials
Acoustic
Self-interference cancellation
Self-sensing
Nondestructive evaluation
Simultaneous transmit and receive

description: Supercoupling is a widely researched topic in wave engineering, which has been used to build coupling channels that can, in principle, support total transmission and complete phase uniformity, independent of the length of the channel. This has generally been accomplished by employing dispersion in media that display a near-zero index. In the field of acoustics, prior works have required the presence of periodic embedded resonators, such as membranes or Helmholtz resonators, in order to observe near-zero properties. Here it is shown, theoretically and experimentally, that supercoupling can occur in an acoustic channel without the presence of embedded resonators. A compressibility-near-zero (CNZ) acoustic channel was observed to show remarkable properties analogous to those found in electromagnetics. Furthermore, these principles are employed to develop an acoustic power divider, which takes advantage of the CNZ properties of the channel to also exhibit phase invariance at the output. In the next section, another extraordinary acoustic transmission phenomenon is explored, regarding the potential for sending and receiving from a single acoustic transducer at the same time and at the same frequency. This is made possible through an electrical circuit that is designed to cancel self-interfering signals in acoustic measurement systems. Systems that employ self-interference cancellation (SIC) are often referred to as simultaneous transmit and receive (STAR) or in-band full duplex (IBFD) systems, which have recently enabled sending and receiving of Radio Frequency (RF) signals at the same time and at the same frequency. This has led to commercialization efforts with the promise of doubling the throughput of traditional radio systems including Wi-Fi and 5G cellular communications. Prior to these advances, researchers in vibration control explored self-sensing actuator systems, also referred to as sensoriactuators or sensorless control systems. Inspired by these developments, these approaches are combined and extended to explore STAR functionality in an acoustic measurement system. First, self-interference cancellation (SIC) is applied to time-domain measurements to demonstrate the potential for a practical, single-transducer ultrasonic nondestructive evaluation (NDE) system to measure echo returns while it is actively transmitting at the same frequency. Theoretical models and experimental results are presented and discussed.
Casimir, Gravitational and Neutron Tests of Dark Energy
Creators: name: Brax, Philippe
name: Davis, Anne-Christine
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate laboratory tests of dark energy theories which modify gravity in a way generalising the inverse power law chameleon models. We make use of the tomographic description of such theories which captures $f(R)$ models in the large curvature limit, the dilaton and the symmetron. We consider their effects in various experiments where the presence of a new scalar interaction may be uncovered. More precisely, we focus on the Casimir, Eot-wash and neutron experiments. We show that dilatons, symmetrons and generalised chameleon models are efficiently testable in the laboratory. For generalised chameleons, we revise their status in the light of forthcoming Casimir experiments like CANNEX in Amsterdam and show that they are within reach of detection.
description: 30 pages, 5 figures
Living as a family caregiver of someone with Huntington's disease : a scoping review
Creators: name: Menier, Mégane
name: Denoyelle, Iris
name: Antoine, Pascal
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Health Psychology
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: This registration concerns a scoping review of studies dealing with the experience of the spouse carer of someone suffering from Huntington's disease.
Porous LSCF/Dense 3YSZ Interface Fracture Toughness Measured by Single Cantilever Beam Wedge Test
Creators: name: Wang, Xin
name: He, Fei
name: Chen, Zhangwei
name: Atkinson, Alan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences
subject: 74K35

description: Sandwich specimens were prepared by firing a thin inter-layer of porous La0.6Sr0.4Co0.2Fe0.8O3-d (LSCF) to bond a thin tetragonal yttria-stabilised zirconia (YSZ) beam to a thick YSZ substrate. Fracture of the joint was evaluated by introducing a wedge between the two YSZ adherands so that the stored energy in the thin YSZ cantilever beam drives a stable crack in the adhesive bond and allows the critical energy release rate for crack extension (fracture toughness) to be measured. The crack path in most specimens showed a mixture of adhesive failure (at the YSZ-LSCF interface) and cohesive failure (within the LSCF). It was found that the extent of adhesive fracture increased with firing temperature and decreased with LSCF layer thickness. The adhesive failures were mainly at the interface between the LSCF and the thin YSZ beam and FEM modelling revealed that this is due to asymmetric stresses in the LSCF. Within the firing temperature range of 1000-1150C, the bonding fracture toughness appears to have a strong dependence on firing temperature. However, the intrinsic adhesive fracture toughness of the LSCF/YSZ interface was estimated to be 11 Jm2 and was not firing temperature dependent within the temperature range investigated.
description: 13 figures, 1 table, journal paper published
title: Challenges in Combustion for Aerospace Propulsion
Creators: name: Dupoirieux, Francis
name: Cochet, Alain
name: Bodoc, Virginel
name: Brossard, Christophe
name: Dessornes, Olivier
name: Guin, Christian
name: Lecourt, Renaud
name: Orain, Mikael
name: Vincent-Randonnier, Axel
name: Grisch, Frederic
name: Boukhalfa, Mourad
name: Cabot, Gilles
name: Renou, Bruno
name: Vandel, Alexis
name: Le Pichon, Thomas
name: Laverdant, Alain
name: Scherrer, Dominique
name: Ferrier, Marc
name: Moule, Yann
name: Sabelnikov, Vladimir
name: Fiorina, Benoit
name: Vie, Aymeric
name: Franzelli, Benedetta
name: Darabiha, Nasser
name: Massot, Marc
name: Dayma, Guillaume
name: Dagaut, Philippe
name: Moureau, Vincent
name: Vervisch, Luc
name: Berlemont, Alain
name: Riber, Eleonore
name: Cuenot, Benedicte
name: Vicquelin, Ronan
name: Lartigue, Ghislain
name: Figuer, Alexandre
name: Mery, Yoann
name: Lamouroux, Jean
name: Richard, Stephane
name: Gicquel, Laurent
name: Schmitt, Thomas
name: Candel, Sebastien
name: Bertier, Nicolas
name: Geigle, Klaus Peter
name: Eberle, Christian
name: Gerlinger, Peter
name: Ortega, Ismael
name: Delhaye, David
name: Ouf, Francois-Xavier
name: Ferry, Daniel
Publisher: name: ONERA
Year: 2016
Subjects: AIRCRAFT PROPULSION
ROCKET PROPULSION
COMBUSTION
RESEARCH IN COMBUSTION
COMBUSTION FACILITIES
COMBUSTION MODELING

description: Given that combustion involves fuels in which chemical energy is very dense and is able to deliver a very high power/volume ratio, this mode of energy conversion, despite its negative aspects, will remain unavoidable for aerospace propulsion in the long term. One of its negative aspects relates to the conversion into kinetic energy of the heat released by combustion, which yields a thermodynamical efficiency that is necessarily much less than one. The improvement of this efficiency is achieved by increasing the pressure and temperature, which leads to increasingly tougher operating conditions in combustion chambers. Other issues are combustion instabilities, which compromise safety, load comfort and engine lifespan, as well as CO2 and miscellaneous pollutant emissions, combustion noise and ignition or re-ignition during flight. In order to tackle all of these points it is necessary to fully understand the interaction between the many complex physical phenomena involved in combustion systems: turbulence, chemical kinetics, multiphase flow behavior, heat and species diffusion, heat transfer to the walls, radiative transfer and acoustics. This difficult task requires vigorous research activity to be incessantly pursued. This issue of AerospaceLab is aimed at giving the reader an idea of the large field of research in that domain, including works ranging from experimental combustion to physical modelling and numerical simulation of combustion. It is also aimed at convincing the reader that these works are complementary with each other.
description: AerospaceLab Journal, Issue 11, June 2016; ISSN: 2107-6596
RECENT CHANGES IN TEACHER-STUDENT RELATIONSHIPS
Creators: name: Khadjaeva, Naima
Publisher: name: Zenodo
Year: 2024

description: The teacher-student relationship is a fundamental aspect of the educational process and has evolved dramatically in response to societal, technological, and pedagogical changes. This paper examines recent trends in teacher-student relationships, focusing on the impact of digital technology, changes in pedagogical practices, and the influence of social and cultural shifts. Through qualitative research methods, including surveys and interviews conducted with educators and students, the paper identifies key changes in communication styles, expectations, and the nature of authority in classrooms. The findings highlight the potential for improved engagement and learning outcomes while also noting challenges that may arise in these evolving dynamics. The paper concludes with recommendations for fostering positive teacher-student relationships in contemporary educational settings.
Service-Oriented Logic Programming
Creators: name: Tutu, Ionut
name: Fiadeiro, Jose Luiz
Publisher: name: arXiv
Year: 2015
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: We develop formal foundations for notions and mechanisms needed to support service-oriented computing. Our work builds on recent theoretical advancements in the algebraic structures that capture the way services are orchestrated and in the processes that formalize the discovery and binding of services to given client applications by means of logical representations of required and provided services. We show how the denotational and the operational semantics specific to conventional logic programming can be generalized using the theory of institutions to address both static and dynamic aspects of service-oriented computing. Our results rely upon a strong analogy between the discovery of a service that can be bound to an application and the search for a clause that can be used for computing an answer to a query; they explore the manner in which requests for external services can be described as service queries, and explain how the computation of their answers can be performed through service-oriented derivatives of unification and resolution, which characterize the binding of services and the reconfiguration of applications.
Understanding deforestation and its impact on the precipitation patterns of northwestern Belize tropical forests
Creators: name: Ruffe, Danielle Astrid
name: 0000-0002-1710-8144
Publisher: name: The University of Texas at Austin
Year: 2021
Subjects: Deforestation
Remote sensing
Tropical forests
Rainfall patterns
Central America

description: Tropical forest environments in Central America have undergone over 10,000 years of land use change caused by intermittent human occupation periods. The Orange Walk district of northwestern Belize, the area of focus for this study, is located in the Maya Lowlands in the southern Yucatán Peninsula. With the rise of recent large-scale industrialized agriculture, deforestation is rapidly changing environmental dynamics in these tropical forest ecosystems. Research suggests a link between deforested regions and precipitation shifts in regional and local climates. To study these potential impacts, this study analyzes satellite data from Climate Hazards Infrared Precipitation with Station data (CHIRPS) to assess a 23-year precipitation record (1998 – 2020) and analyze the potential relationship between deforestation and hydroclimate. This thesis generated a Google Earth Engine (GEE) script to acquire annual and seasonal cumulative precipitation averages, as well as derive precipitation rates from Hansen’s Global Forest Change dataset in GEE. To evaluate satellite data accuracy, this project collected data from ground rain gauges in the region to run validation assessments on the satellite dataset. This is the first study to analyze deforestation and precipitation shifts in northwestern Belize, a region in the outer tropics (~17 degrees latitude). This research finds a potential significant correlation between deforestation rate increase and precipitation increase, which may be attributed to the increased heterogenous landscape in the region. The temporal scale and spatial resolution represented some limitations with the research; however, this research is helpful in understanding precipitation shifts in response to local deforestation events.
Deployment of the computational environment for ML-INFN on INFN Cloud using GPUs (possibly partitioned)
Creators: name: Vino, Gioacchino
name: Antonacci, Marica
name: Ciangottini, Diego
name: Fornari, Federico
name: Gattari, Mauro
name: Spiga, Daniele
name: Vianello, Enrico
Publisher: name: Zenodo
Year: 2023

description: INFN DataCloud Dashboard is a centralized portal that allows system administrators to instantiate services on the INFN Cloud federated infrastructure. The user has a portfolio of services available including the possibility of instantiating a virtual machine already configured for code development using Machine Learning algorithms; this service is called "Computational environment for Machine Learning INFN (ML_INFN)". Once the service has been selected, the user can enter information in the dedicated fields to customize its configuration, such as integration with IAM, the Jupyter image to use, whether to enable the resource monitoring system, mounting a CVMFS repository, deployment and partitioning of a GPU. This last feature, among others, is present in the new version of the service, and adds the possibility of partitioning specific models of Nvidia graphics cards, thus creating a greater number of virtual and less performing GPUs, usable by users of the configured instance of JupyterHub. This allows a user to overcome a previous limitation: multiple users could use JupyterLab instances at the same time only for applications requiring CPU usage or limited to the number of physical GPUs present on the machine. With partitioning, the maximum number of users who can simultaneously use a GPU, to be associated with their JupyterLab instance, has increased, at most, by a factor of 7, when considering the physical Nvidia A100 graphics card. Once the request for the service has been submitted, the portal will provide all the information necessary to access the virtual machine and the configured JupyterHub instance. This presentation was given in the ICT Infrastructures and Distributed Computing track of INFN CCR Workshop 2023.
Connecting CO Intensity Mapping to Molecular Gas and Star Formation in the Epoch of Galaxy Assembly
Creators: name: Li, Tony Y.
name: Wechsler, Risa H.
name: Devaraj, Kiruthika
name: Church, Sarah E.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Intensity mapping, which images a single spectral line from unresolved galaxies across cosmological volumes, is a promising technique for probing the early universe. Here we present predictions for the intensity map and power spectrum of the CO(1-0) line from galaxies at z ~ 2.4 -2.8, based on a parameterized model for the galaxy-halo connection, and demonstrate the extent to which properties of high-redshift galaxies can be directly inferred from such observations. We find that our fiducial prediction should be detectable by a realistic experiment. Motivated by significant modeling uncertainties, we demonstrate the effect on the power spectrum of varying each parameter in our model. Using simulated observations, we infer constraints on our model parameter space with an MCMC procedure, and show corresponding constraints on the LIR-LCO relation and the CO luminosity function. These constraints would be complementary to current high-redshift galaxy observations, which can detect the brightest galaxies but not complete samples from the faint end of the luminosity function. By probing these populations in aggregate, CO intensity mapping could be a valuable tool for probing molecular gas and its relation to star formation in high-redshift galaxies.
description: Updated to match ApJ accepted version, with corrections to figure/table formatting (supersedes the published version, wherever they differ). 14 pages + appendix (22 pages total), 12 figures, 3 tables
title: ONERA Test Facilities for Combustion in Aero Gas Turbine Engines, and Associated Optical Diagnostics
Creators: name: Cochet, Alain
name: Bodoc, Virginel
name: Brossard, Christophe
name: Dessornes, Olivier
name: Guin, Christian
name: Lecourt, Renaud
name: Orain, Mikael
name: Vincent-Randonnier, Axel
Publisher: name: ONERA
Year: 2016
Subjects: TEST FACILITIES
COMBUSTION
OPTICAL DIAGNOSTICS
AERO-GAS TURBINE ENGINE

description: The aim of this paper is to provide an overview of the ONERA test facilities devoted to the study of combustion in gas turbine engines. The objectives of the experimental
studies performed with these test rigs are very ambitious and extend from building
databases for the validation of codes and models used in numerical simulation to
applied research for evaluating the performance of advanced aero injection systems
in mono-sector, multi-sector or full annular combustion chambers. For more than ten
years, aside from standard measurements (i.e., pressure, temperature, mass flow
rates, gas analysis sampling), optical diagnostics have been widely associated with the
test campaigns carried out in these rigs. Many optical methods are now very commonly
used to measure for instance flow velocity fields, size and velocity of droplets, and
the location of combustion zones. Other methods that are more difficult to implement,
or still under development, are being increasingly used or proposed for measuring physical
or chemical parameters, such as temperature, size of soot particles or concentration
of combustion products. Examples of the results obtained with the ONERA test
facilities and optical diagnostics are given, in order to illustrate the studies presented in
this paper.
description: AerospaceLab Journal, Issue 11, June 2016; ISSN: 2107-6596