cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Open Multi-Access Network Platform with Dynamic Task Offloading and Intelligent Resource Monitoring
Creators: name: Tachibana, Takuji
name: Sawada, Kazuki
name: Fujii, Hiroyuki
name: Maruyama, Ryo
name: Yamada, Tomonori
name: Fujii, Masaaki
name: Fukuda, Toshimichi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: We constructed an open multi-access network platform using open-source hardware and software. The open multi-access network platform is characterized by the flexible utilization of network functions, integral management and control of wired and wireless access networks, zero-touch provisioning, intelligent resource monitoring, and dynamic task offloading. We also propose an application-driven dynamic task offloading that utilizes intelligent resource monitoring to ensure effective task processing in edge and cloud servers. For this purpose, we developed a mobile application and server applications for the open multi-access network platform. To investigate the feasibility and availability of our developed platform, we experimentally and analytically evaluated the effectiveness of application-driven dynamic task offloading and intelligent resource monitoring. The experimental results demonstrated that application-driven dynamic task offloading could reduce real-time task response time and traffic over metro and core networks.
Kr Isotopic Compositions in Stardust SiC grains and AGB Winds
Creators: name: Tonchev, A.
name: Iliadis, C.
name: Raut, R.
name: Karakas, A.I.
name: Buntain, J.
name: Lugaro, M.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2012

description: Krypton (Kr) is a heavy noble gas that does not chemically react and hence does not condense into dust. However, it is found in trace amounts inside stardust silicon carbide (SiC) grains in meteorites, which are believed to have condensed in the C-rich envelopes of low-mass asymptotic giant branch (AGB) stars. The measured isotopic composition of Kr clearly reveals the signature of the s (slow neutron-capture) process. It is likely that Kr is ionised and implanted in stardust SiC grains via stellar winds in two different evolutionary phases: one during the AGB phase in small grains showing low 86Kr/82Kr, and another during the post-AGB phase in large grains showing high 86Kr/82Kr ratios. The low 86Kr/82Kr ratios observed in stardust SiC grains can be explained by model predictions of AGB winds. On the other hand, to explain the high 86Kr/82Kr ratios we need to look at the material in the winds of the post-AGB phase. We present Kr isotopic compositions predicted by s-process AGB-star models of different masses and metallicities, and compare them to data from stardust SiC grains. We find that to match the high 86Kr/82Kr ratios observed in the large grains, a proton ingestion during the thermal pulse (TP) may be required. We also find that the 84Kr(n,γ)85Kr neutron-capture cross section should to be lower than the current estimate in order for our models to match the pure s-process value.
Two distinct kinetic regimes for the relaxation of light-induced superconductivity in La$_{1.675}$Eu$_{0.2}$Sr$_{0.125}$CuO$_{4}$
Creators: name: Hunt, C. R.
name: Nicoletti, D.
name: Kaiser, S.
name: Takayama, T.
name: Takagi, H.
name: Cavalleri, A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We address the kinetic competition between charge striped order and superconductivity in La$_{1.675}$Eu$_{0.2}$Sr$_{0.125}$CuO$_{4}$. Ultrafast optical excitation is tuned to a mid-infrared vibrational resonance that destroys charge order and promptly establishes transient coherent interlayer coupling in this material. This effect is evidenced by the appearance of a longitudinal plasma mode reminiscent of a Josephson plasma resonance. We find that coherent interlayer coupling can be generated up to the charge order transition $T_{CO} \approx$ 80 K, far above the equilibrium superconducting transition temperature of any lanthanide cuprate. Two key observations are extracted from the relaxation kinetics of the interlayer coupling. Firstly, the plasma mode relaxes through a collapse of its coherence length and not its density. Secondly, two distinct kinetic regimes are observed for this relaxation, above and below spin order transition $T_{SO} =$ 25 K. Especially, the temperature independent relaxation rate observed below $T_{SO}$ is anomalous and suggests coexistence of superconductivity and stripes rather than competition. Both observations support arguments that a low temperature coherent stripe (or pair density wave) phase suppresses c-axis tunnelling by disruptive interference rather than by depleting the condensate.
description: 14 pages, 4 figures (main text), supplementary added to v2: 6 pages, 5 figures
Fock space associated to Coxeter group of type B
Creators: name: Bożejko, Marek
name: Ejsmont, Wiktor
name: Hasebe, Takahiro
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary 46L53, Secondary 46L54, 60G51, 60H05

description: In this article we construct a generalized Gaussian process coming from Coxeter groups of type B. It is given by creation and annihilation operators on an $(α,q)$-Fock space, which satisfy the commutation relation $$ b_{α,q}(x)b_{α,q}^\ast(y)-qb_{α,q}^\ast(y)b_{α,q}(x)=\langle x, y\rangle I+α\langle \overline{x}, y \rangle q^{2N}, $$ where $x,y$ are elements of a complex Hilbert space with a self-adjoint involution $x\mapsto\bar{x}$ and $N$ is the number operator with respect to the grading on the $(α,q)$-Fock space. We give an estimate of the norms of creation operators. We show that the distribution of the operators $b_{α,q}(x)+b_{α,q}^\ast(x)$ with respect to the vacuum expectation becomes a generalized Gaussian distribution, in the sense that all mixed moments can be calculated from the second moments with the help of a combinatorial formula related with set partitions. Our generalized Gaussian distribution associates the orthogonal polynomials called the $q$-Meixner-Pollaczek polynomials, yielding the $q$-Hermite polynomials when $α=0$ and free Meixner polynomials when $q=0$.
description: 22 pages, 6 figures
title: Investigation on dynamics of drillstring systems from random viewpoint
Creators: name: Qiu, Hongyuan
Publisher: name: Memorial University of Newfoundland
Year: 2023

description: Drillstrings are one of the critical components used for exploring and exploiting oil and gas reservoirs in the petroleum industry. As being very long and slender, the drillstring experiences various vibrations during the drilling operation, and these vibrations are random in essence. The first part of the thesis focuses on stochastic stick-slip dynamics of the drill bit by a finite element model and a single degree of freedom drillstring model in Chapters 3 and 4, respectively. In the single degree of freedom model, the path integration (PI) method is firstly used to obtain the probability density evolution of the dynamic response. Then Monte Carlo (MC) simulation is used for validating PI results and conducting the parametric study. The second step of my research is to study the stochastic dynamics of a vertical, multiple degrees of freedom drillstring system. The work of this part is presented in Chapter 5. The novelty of this work relies on the fact that it is the first time that the statistic linearization method is applied to a drillstring system in the bit-rock interaction to find an equivalent linear dynamic system which is then solved with the stochastic Newmark algorithm. After that, the stick-slip and bit-bounce phenomena are analyzed from random viewpoint. The third step of my research move on to directional drilling. A static study of directional drillstring from random viewpoint is presented in Chapter 6. The finite element method (FEM) based on the soft string model is employed and built. Then two strategies are taken to model the random component for hoisting drag calculation. The purpose of this work is to analyze the effects of the random component on hoisting drag calculation by the MC simulation method.
Air Entrainment in Dynamic Wetting: Knudsen Effects and the Influence of Ambient Air Pressure
Creators: name: Sprittles, James E.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Recent experiments on coating flows and liquid drop impact both demonstrate that wetting failures caused by air entrainment can be suppressed by reducing the ambient gas pressure. Here, it is shown that non-equilibrium effects in the gas can account for this behaviour, with ambient pressure reductions increasing the gas' mean free path and hence the Knudsen number $Kn$. These effects first manifest themselves through Maxwell slip at the gas' boundaries so that for sufficiently small $Kn$ they can be incorporated into a continuum model for dynamic wetting flows. The resulting mathematical model contains flow structures on the nano-, micro- and milli-metre scales and is implemented into a computational platform developed specifically for such multiscale phenomena. The coating flow geometry is used to show that for a fixed gas-liquid-solid system (a) the increased Maxwell slip at reduced pressures can substantially delay air entrainment, i.e. increase the `maximum speed of wetting', (b) unbounded maximum speeds are obtained as the pressure is reduced only when slip at the gas-liquid interface is allowed for and (c) the observed behaviour can be rationalised by studying the dynamics of the gas film in front of the moving contact line. A direct comparison to experimental results obtained in the dip-coating process shows that the model recovers most trends but does not accurately predict some of the high viscosity data at reduced pressures. This discrepancy occurs because the gas flow enters the `transition regime', so that more complex descriptions of its non-equilibrium nature are required. Finally, by collapsing onto a master curve experimental data obtained for drop impact in a reduced pressure gas, it is shown that the same physical mechanisms are also likely to govern splash suppression phenomena.
description: Accepted for publication in the Journal of Fluid Mechanics
STARLIB: A website tutorial
Creators: name: Iliadis, C.
name: Sallaska, A.L.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2012

description: STARLIB is a new, next-generation reaction-rate library that provides a tabular, up-to-date database that supplies not only the recommended rate and its factor uncertainty but also the rate distribution (i.e., its probability density function). The library structure is based on Monte-Carlo method to calculate reaction rates. This method uses experimental nuclear physics data as inputs and yields the reaction rate output probability density function at a given temperature. From the cumulative distribution of rate probability densities, the low, median, and high rates are rigorously defined. Here, we detail a method for accessing STARLIB on the Internet at starlib.physics.unc. edu. The three main components of the website include the Rate Library, Rate Calculator, and Details. Within the Rate Library, one may access STARLIB itself. Monte Carlo reaction rate simulations may be run on our server from the Rate Calculator page. Pertinent information on STARLIB is given on the Details page. In this article, an overview of STARLIB is presented, and each website component is discussed in depth.
The "Green Bean" Galaxy SDSS J224024.1--092748: Unravelling the emission signature of a quasar ionization echo
Creators: name: Davies, Rebecca L.
name: Schirmer, Mischa
name: Turner, James E. H.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: "Green Bean" Galaxies (GBs) are the most [O III]-luminous type-2 active galactic nuclei (AGN) at z~0.3. However, their infrared luminosities reveal AGN in very low activity states, indicating that their gas reservoirs must be ionized by photons from a recent high activity episode - we are observing quasar ionization echoes. We use integral field spectroscopy from the Gemini Multi-Object Spectrograph to analyse the 3D kinematics, ionization state, temperature and density of ionized gas in the GB SDSS J224024.1-092748. We model the emission line spectrum of each spaxel as a superposition of up to three Gaussian components and analyse the physical properties of each component individually. Two narrow components, tracing the velocity fields of the disc and an ionized gas cloud, are superimposed over the majority of the galaxy. Fast shocks produce hot ($T_e$ $\geq$ 20,000 K), dense ($n_e$ $\geq$ 100 cm$^{-3}$), turbulent ($σ$ $\geq$ 600 km s$^{-1}$), [O III]-bright regions with enhanced [N II]/H$α$ and [S II]/H$α$ ratios. The most prominent such spot is consistent with a radio jet shock-heating the interstellar medium. However, the AGN is still responsible for $\geq$ 82 per cent of the galaxy's total [O III] luminosity, strengthening the case for previous quasar activity. The ionized gas cloud has a strong kinematic link to the central AGN and is co-rotating with the main body of the galaxy, suggesting that it may be the remnant of a quasar-driven outflow. Our analysis of J224024.1-092748 indicates that GBs provide a unique fossil record of the transformation from the most luminous quasars to weak AGN.
description: 24 pages, 15 figures, accepted for publication in MNRAS; affiliations and acknowledgements updated
Current status of the 22Ne+α s-process neutron source
Creators: name: Iliadis, C.
name: Longland, R.
Publisher: name: Institute of Physics Publishing
Year: 2012

description: The reaction rates of the s-process neutron producing 22Ne(α,n)25Mg reaction and its competing 22Ne(α, γ)26Mg reaction are needed to accurately predict nucleosynthesis in massive stars and Asymptotic Giant Branch stars. Here, we present a re-evaluation of the reaction rates by incorporating recent data and by using a Monte Carlo uncertainty propagation method. The effect of those results on nucleosynthesis in massive stars is studied. We show that our new rates lead to similar final abundances, but with significantly reduced uncertainties in comparison to literature rates.
Raman spectroscopy at the edges of multilayer graphene
Creators: name: Li, Q. -Q.
name: Zhang, X.
name: Han, W. -P.
name: Lu, Y.
name: Shi, W.
name: Wu, J. -B.
name: Tan, P. -H.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Edges naturally exist in a single-layer graphene sample. Similarly, individual graphene layers in a multilayer graphene sample contribute their own edges. We study the Raman spectrum at the edge of a graphene layer laid on n layer graphene (nLG). We found that the D band observed from the edge of the top graphene layer exhibits an identical line shape to that of disordered (n+1)LG induced by ion-implantation. Based on the spectral features of the D and 2D bands, we identified two types of alignment configurations at the edges of mechanically-exfoliated bilayer and trilayer graphenes, whose edges are well-aligned from their optical images.
description: 9 pages, 2 figures
A Mess of Memory System Benchmarking, Simulation and Application Profiling
Creators: name: Esmaili-Dokht, Pouya
Publisher: name: Zenodo
Year: 2024
Subjects: memory systems
computer architecture
benchmarking
simulation
CXL
Application profiling

description: This is a the content of git repository for Mess benchmark and Mess simulator on 11th of September of 2024. The git is going to be updated continuesly.
Formalizing Size-Optimal Sorting Networks: Extracting a Certified Proof Checker
Creators: name: Cruz-Filipe, Luís
name: Schneider-Kamp, Peter
Publisher: name: arXiv
Year: 2015
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Since the proof of the four color theorem in 1976, computer-generated proofs have become a reality in mathematics and computer science. During the last decade, we have seen formal proofs using verified proof assistants being used to verify the validity of such proofs. In this paper, we describe a formalized theory of size-optimal sorting networks. From this formalization we extract a certified checker that successfully verifies computer-generated proofs of optimality on up to 8 inputs. The checker relies on an untrusted oracle to shortcut the search for witnesses on more than 1.6 million NP-complete subproblems.
description: IMADA-preprint-cs
Cross-section measurements of the 86Kr(γ, n) reaction to probe the s-process branching at 85Kr
Creators: name: Iliadis, C.
name: Tonchev, A.P.
name: Tornow, W.
name: Banu, A.
name: Raut, R.
name: Schwengner, R.
name: Rusev, G.
name: Kelley, J.H.
Publisher: name: Institute of Physics Publishing
Year: 2012

description: For the first time, cross-section measurements were carried out for the 86Kr(γ, n) reaction in order to probe the s-process branching point nucleus 85Kr. The branching point nuclei in the s-process path are of importance in testing and constraining the nucleosynthesis models. Cross-section measurement for the photoneutron reaction on the neighbouring stable isotope is carried out to deduce the aforesaid neutron capture cross-section, as has been adopted in the present case of 85Kr branching point. The cross-section results from the 86Kr(γ, n) reaction were compared with the statistical model calculations using TALYS code.
The Private and Public Correlation Cost of Three Random Variables with Collaboration
Creators: name: Chitambar, Eric
name: Hsieh, Min-Hsiu
name: Winter, Andreas
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In this paper we consider the problem of generating arbitrary three-party correlations from a combination of public and secret correlations. Two parties -- called Alice and Bob -- share perfectly correlated bits that are secret from a collaborating third party, Charlie. At the same time, all three parties have access to a separate source of correlated bits, and their goal is to convert these two resources into multiple copies of some given tripartite distribution $P_{XYZ}$. We obtain a single-letter characterization of the trade-off between public and private bits that are needed to achieve this task. The rate of private bits is shown to generalize Wyner's classic notion of common information held between a pair of random variables. The problem we consider is also closely related to the task of secrecy formation in which $P_{XYZ}$ is generated using public communication and local randomness but with Charlie functioning as an adversary instead of a collaborator. We describe in detail the differences between the collaborative and adversarial scenarios.
description: Cleaned up a few details in the achievability proof
Calculus for Fourier Integral Operators in generalized SG classes
Creators: name: Coriasco, S.
name: Toft, J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 35A18, 35S30, 42B05, 35H10

description: We construct a calculus for generalized $\mathbf{SG}$ Fourier integral operators, extending known results to a broader class of symbols of $\mathbf{SG}$ type. In particular, we do not require that the phase functions are homogeneous. We also prove the $L^2(\mathbf{R}^{d})$-boundedness of the generalized $\mathbf{SG}$ Fourier integral operators having regular phase functions and amplitudes uniformly bounded on $\mathbf{R}^{2d}$.
description: 42 pages. arXiv admin note: substantial text overlap with arXiv:1307.6249
Reaction rates for the s-process neutron source 22Ne + α
Creators: name: Longland, R.
name: Iliadis, C.
name: Karakas, A.I.
Publisher: name: American Physical Society
Year: 2012

description: The 22Ne(α,n)25Mg reaction is an important source of neutrons for the s-process. In massive stars responsible for the weak component of the s-process, 22Ne(α,n)25Mg is the dominant source of neutrons, both during core helium burning and in carbon-shell burning. For the main s-process component produced in asymptotic giant branch (AGB) stars, the 13C(α,n)16O reaction is the dominant source of neutrons operating during the interpulse period, with the 22Ne+α source affecting mainly the s-process branchings during a thermal pulse. Rate uncertainties in the competing 22Ne(α,n)25Mg and 22Ne(α,γ)26Mg reactions result in large variations of s-process nucleosynthesis. Here, we present up-to-date and statistically rigorous 22Ne+α reaction rates using recent experimental results and Monte Carlo sampling. Our new rates are used in postprocessing nucleosynthesis calculations both for massive stars and AGB stars. We demonstrate that the nucleosynthesis uncertainties arising from the new rates are dramatically reduced in comparison to previously published results, but several ambiguities in the present data must still be addressed. Recommendations for further study to resolve these issues are provided.
Cross-section measurement of 9Be(γ,n)8Be and implications for α+α+n→9Be in the r process
Creators: name: Karwowski, H.J.
name: Clegg, T.B.
name: Howell, C.R.
name: Tompkins, J.R.
name: Arnold, C.W.
name: Rich, G.C.
name: Iliadis, C.
Publisher: name: American Physical Society
Year: 2012

description: Models of the r process are sensitive to the production rate of 9Be because, in explosive environments rich in neutrons, α(αn,γ) 9Be is the primary mechanism for bridging the stability gaps at A=5 and A=8. The α(αn,γ)9Be reaction represents a two-step process, consisting of α+α→8Be followed by 8Be(n,γ)9Be. We report here on a new absolute cross-section measurement for the 9Be(γ,n)8Be reaction conducted using a highly efficient, 3He-based neutron detector and nearly monoenergetic photon beams, covering energies from Eγ=1.5 MeV to Eγ=5.2 MeV, produced by the High Intensity γ-ray Source of Triangle Universities Nuclear Laboratory. In the astrophysically important threshold energy region, the present cross sections are 40% larger than those found in most previous measurements and are accurate to ±10% (95% confidence). The revised thermonuclear α(αn,γ)9Be reaction rate could have implications for the r process in explosive environments such as type II supernovae.
XAI and Digital Competence (Sub-project2_Experiment1)
Creators: name: Boerman, Sophie C.
name: Chenyue Wang
name: Kroon, Anne C.
name: De Vreese, Claes
name: Moeller, Judith
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Social and Behavioral Sciences
subject: Communication
subject: Communication Technology and New Media
subject: Human-AI Interaction
subject: Digital Competence
subject: Recommender System
subject: Explainable AI

description: This pre-registration is composed of three sections: the research background, method, and planned analyses. This study is part of the larger project ‘Understanding XAI as digital competence’, which aims to investigate how explainable AI (XAI) can promote adequate levels of user digital competence so users can cope with AI-driven communication. It includes three sub-projects that build on each other: 1) users’ current levels of AI competence, including users’ AI knowledge, AI skills, and AI perceptions; 2) how people process and respond to different types of explanations of AI systems generated by XAI; and 3) the effects of XAI on user’s digital competence. The current study focuses on the second sub-project and examines how users process and respond to different types of explanations in recommender systems. We plan to conduct an eye-tracking experiment with a 3 (scope of explanation: local vs. global vs. Joint explanation) x 2 (modality of explanation: text-only vs. text & graphic illustration) between-subjects design, and a control group exposed to RS without any explanation. The eye-tracking experiment will take place between February 2023 and April 2023. Ethical approval was obtained for this project by the Ethics Committee at the University of Amsterdam.
Observation of a crossover in kinetic aggregation of Palladium colloids
Creators: name: Ghafari, M.
name: Ranjbar, M.
name: Rouhani, S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We use field emission scanning electron microscope (FE-SEM) to investigate the growth of palladium colloids over the surface of thin films of WO3/glass. The film is prepared by Pulsed Laser Deposition (PLD) at different temperatures. A PdCl2 (aq) droplet is injected on the surface and in the presence of steam hydrogen the droplet is dried through a reduction reaction process. Two distinct aggregation regimes of palladium colloids are observed over the substrates. We argue that the change in aggregation dynamics emerges when the measured water drop Contact Angel (CA) for the WO3/glass thin films passes a certain threshold value, namely CA = 46 degrees, where a crossover in kinetic aggregation of palladium colloids occurs. Our results suggest that the mass fractal dimension of palladium aggregates follows a power-law behavior. The fractal dimension (Df) in the fast aggregation regime, where the measured CA values vary from 27 up to 46 degrees, according to different substrate deposition temperatures, is Df = 1.75 (0.02). This value of Df is in excellent agreement with kinetic aggregation of other colloidal systems in fast aggregation regime. Whereas for the slow aggregation regime, with CA = 58 degrees, the fractal dimension changes abruptly to Df=1.92 (0.03). We have also used a modified Box-Counting method to calculate fractal dimension of gray-level images and observe that the crossover at around CA = 46 degrees remains unchanged.
description: 13 pages, 8 figures
Non-Target Screening of Surface Water Samples to Identify Exposome-Related Pollutants: A Case Study From Luxembourg
Creators: name: Aurich, Dagny
name: Diderich, Philippe
name: Helmus, Rick
name: Schymanski, Emma
Publisher: name: Zenodo
Year: 2023

description: Talk given by Dagny Aurich at the ICNTS in Erding
Gaussian Beam Transmission through a Gyrotropic-Nihility Finely-Stratified Structure
Creators: name: Tuz, Vladimir R.
name: Fesenko, Volodymyr I.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The three-dimensional Gaussian beam transmission through a ferrite-semiconductor finely-stratified structure being under an action of an external static magnetic field in the Faraday geometry is considered. The beam field is represented by an angular continuous spectrum of plane waves. In the long-wavelength limit, the studied structure is described as a gyroelectromagnetic medium defined by the effective permittivity and effective permeability tensors. The investigations are carried out in the frequency band where the real parts of the on-diagonal elements of both effective permittivity and effective permeability tensors are close to zero while the off-diagonal ones are non-zero. In this frequency band the studied structure is referred to a gyrotropic-nihility medium. It is found out that a Gaussian beam keeps its parameters unchanged (beam width and shape) when passing through the layer of such a medium except of a portion of the absorbed energy.
description: 16 pages, 7 figures
Matching of experimental and statistical-model thermonuclear reaction rates at high temperatures
Creators: name: Longland, R.
name: Iliadis, C.
name: Newton, J.R.
Publisher: name: American Physical Society
Year: 2008

description: We address the problem of extrapolating experimental thermonuclear reaction rates toward high stellar temperatures (T>1 GK) by using statistical model (Hauser-Feshbach) results. Reliable reaction rates at such temperatures are required for studies of advanced stellar burning stages, supernovae, and x-ray bursts. Generally accepted methods are based on the concept of a Gamow peak. We follow recent ideas that emphasized the fundamental shortcomings of the Gamow peak concept for narrow resonances at high stellar temperatures. Our new method defines the effective thermonuclear energy range (ETER) by using the 8th, 50th, and 92nd percentiles of the cumulative distribution of fractional resonant reaction rate contributions. This definition is unambiguous and has a straightforward probability interpretation. The ETER is used to define a temperature at which Hauser-Feshbach rates can be matched to experimental rates. This matching temperature is usually much higher compared to previous estimates that employed the Gamow peak concept. We suggest that an increased matching temperature provides more reliable extrapolated reaction rates since Hauser-Feshbach results are more trustwhorthy the higher the temperature. Our ideas are applied to 21 (p,γ), (p,α), and (α,γ) reactions on A=20-40 target nuclei. For many of the cases studied here, our extrapolated reaction rates at high temperatures differ significantly from those obtained using the Gamow peak concept.
Résilience et Entrepreneuriat : Une Analyse Théorique des Dynamiques d'Adaptation et de Survie
Creators: name: Yassine BAAZIZI
name: Mustapha JAAD
name: Reda TAMANINE
name: Hind ENNAJI
Publisher: name: Zenodo
Year: 2024

description: Cet article explore le concept de résilience dans le contexte de l'entrepreneuriat, en se concentrant sur les dynamiques d'adaptation et de survie des entrepreneurs face aux défis contemporains. À travers une analyse théorique approfondie, l'article met en lumière les mécanismes par lesquels la résilience permet aux entrepreneurs de surmonter les crises, de rebondir après des échecs, et de transformer les obstacles en opportunités de croissance. Il souligne également l'importance des dimensions psychologiques, cognitives et émotionnelles dans le développement de la résilience entrepreneuriale. En intégrant des perspectives issues de divers domaines, cet article offre de nouvelles pistes pour comprendre comment la résilience peut être cultivée et appliquée dans les pratiques entrepreneuriales.
Q&A on MetaPath
Creators: name: European Food Safety Authority
Publisher: name: Zenodo
Year: 2021
Subjects: subject: pesticides
subject: residues
subject: MetaPath
subject: metabolism studies
subject: http://id.agrisemantics.org/gacs/C284
subject: http://id.agrisemantics.org/gacs/C1841

description: This Excel file contains frequently asked questions related to the MetaPath platform. For more details and background information please consult the EFSA website
description: IT; Xlsx; pesticides.MRL@efsa.europa.eu
Q&A on MetaPath
Creators: name: European Food Safety Authority
Publisher: name: Zenodo
Year: 2023
Subjects: subject: pesticides
subject: residues
subject: MetaPath
subject: metabolism studies
subject: http://id.agrisemantics.org/gacs/C284
subject: http://id.agrisemantics.org/gacs/C1841

description: This Excel file contains frequently asked questions related to the MetaPath platform. The file has been updated with questions from the info session on how to validate files generated with MSS composers for pesticide metabolism studies. For more details and background information please consult the EFSA website
description: IT; Xlsx; pesticides.MRL@efsa.europa.eu
The effects of variations in nuclear processes on type I X-ray burst nucleosynthesis
Creators: name: Moreno, F.
name: Parikh, A.
name: Iliadis, C.
name: José, J.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2008

description: Type I X-ray bursts are violent stellar events that take place in the H/He-rich envelopes of accreting neutron stars. We have investigated the role played by uncertainties in nuclear processes on the nucleosynthesis accompanying these explosive phenomena. Two different approaches have been adopted, in the framework of postprocessing calculations. In the first one, nuclear rates are varied individually within uncertainties. Ten different models, covering the characteristic parameter space for these stellar events, have been considered. The second, somewhat complementary approach involves a Monte Carlo code in which all nuclear rates are randomly varied within uncertainty limits simultaneously. All in all, about 50,000 postprocessing calculations, with a network containing 606 nuclides (H to 113Xe) and more than 3500 nuclear processes, have been performed in this work. A brief comparison between both procedures is outlined together with an overall account of the key nuclear reactions whose uncertainties have the largest impact in our X-ray burst nucleosynthesis studies.
Registries and surveillance models used to screen neonates for congenital anomalies in LMIC settings: a scoping review
Creators: name: Samad, Lubna
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Medicine and Health Sciences
subject: Public Health

description: The purpose of this scoping review is to identify, characterize and map the existing knowledge about (1) congenital anomalies registries and surveillance systems that have been implemented in LMIC settings; and (2) the factors contributing to the success and failures of these models. The findings of this review will provide an evidence base to guide the development of a pilot CAR that is most suited to the specific needs and challenges in Pakistan and that can ultimately be scaled up to a national program integrated into the health systems platform. The pilot CAR will gather epidemiologic data on affected children and use the evidence to inform policymakers, pediatric surgeons, hospital administrators and communities on the magnitude of need and develop pathways for improved care.
Search for the dark photon in $π^0$ decays by the NA48/2 experiment at CERN
Creators: name: Goudzovski, Evgueni
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A sample of $4.687\times 10^6$ fully reconstructed $K^\pm\toπ^\pmπ^0_D$, $π^0_D\toγe^+e^-$ decay candidates in the kinematic range $m_{ee}>10~{\rm MeV}/c^2$ with a negligible background contamination collected by the NA48/2 experiment at CERN in 2003-04 is analysed to search for the dark photon ($A'$) via the decay chain $K^\pm\toπ^\pmπ^0$, $π^0\toγA'$, $A'\to e^+e^-$. No signal is observed, and preliminary exclusion limits on space of dark photon mass $m_A'$ and mixing parameter $\varepsilon^2$ are reported.
description: Talk given at the DHF 2014 conference, Messina, Italy, 24-26 September 2014
Smiling and Likability PSYC 3301
Creators: name: Allor, Helena
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Social and Behavioral Sciences

description: We want to know more about what kinds of factors impact a person's social attraction. It is a common idea that a person can increase how attractive or likable they seem simply by smiling more. The purpose of this study is to observe and study the effect of smiling on a person’s likability/social attraction.
Traffic Hotspot localization in 3G and 4G wireless networks using OMC metrics
Creators: name: Jaziri, Aymen
name: Nasri, Ridha
name: Chahed, Tijani
Publisher: name: arXiv
Year: 2015
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: In recent years, there has been an increasing awareness to traffic localization techniques driven by the emergence of heterogeneous networks (HetNet) with small cells deployment and the green networks. The localization of hotspot data traffic with a very high accuracy is indeed of great interest to know where the small cells should be deployed and how can be managed for sleep mode concept. In this paper, we propose a new traffic localization technique based on the combination of different key performance indicators (KPI) extracted from the operation and maintenance center (OMC). The proposed localization algorithm is composed with five main steps; each one corresponds to the determination of traffic weight per area using only one KPI. These KPIs are Timing Advance (TA), Angle of Arrival (AoA), Neighbor cell level, the load of each cell and the Harmonic mean throughput (HMT) versus the Arithmetic mean throughput (AMT). The five KPIs are finally combined by a function taking as variables the values computed from the five steps. By mixing such KPIs, we show that it is possible to lessen significantly the errors of localization in a high precision attaining small cell dimensions.
description: 7 pages, 7 figures, published in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications 2014 (PIMRC); IEEE International Symposium on Personal, Indoor and Mobile Radio Communications 2014 (PIMRC)
Value-modulated attentional capture is augmented by win-related sensory cues
Creators: name: Meihui Piao
name: Pearson, Daniel
name: Pelley, Mike Le
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Social and Behavioral Sciences
subject: Cognitive Psychology
subject: Psychology
subject: FOS: Psychology

description: This project investigates the influence of win-related sensory cues on attentional capture by reward-related stimuli.
Rota-Baxter type operators, rewriting systems and Gröbner-Shirshov bases
Creators: name: Gao, Xing
name: Guo, Li
name: Sit, William Y.
name: Zheng, Shanghua
Publisher: name: arXiv
Year: 2014
Subjects: subject: Rings and Algebras (math.RA)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: In this paper we apply the methods of rewriting systems and Gröbner-Shirshov bases to give a unified approach to a class of linear operators on associative algebras. These operators resemble the classic Rota-Baxter operator, and they are called {\it Rota-Baxter type operators}. We characterize a Rota-Baxter type operator by the convergency of a rewriting system associated to the operator. By associating such an operator to a Gröbner-Shirshov basis, we obtain a canonical basis for the free algebras in the category of associative algebras with that operator. This construction include as special cases several previous ones for free objects in similar categories, such as those of Rota-Baxter algebras and Nijenhuis algebras.
description: 39 pages
Relay-Selection Improves the Security-Reliability Trade-off in Cognitive Radio Systems
Creators: name: Zou, Yulong
name: Champagne, Benoit
name: Zhu, Wei-Ping
name: Hanzo, Lajos
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We consider a cognitive radio (CR) network consisting of a secondary transmitter (ST), a secondary destination (SD) and multiple secondary relays (SRs) in the presence of an eavesdropper. We rely on careful relay selection for protecting the ST-SD transmission against the eavesdropper with the aid of both single-relay and multi-relay selection. To be specific, only the "best" SR is chosen in the single-relay selection for assisting the secondary transmission, whereas the multi-relay selection invokes multiple SRs for simultaneously forwarding the ST's transmission to the SD. We analyze both the intercept probability and outage probability of the proposed single-relay and multi-relay selection schemes for the secondary transmission relying on realistic spectrum sensing. We also evaluate the performance of classic direct transmission and artificial noise based methods for the purpose of comparison with the proposed relay selection schemes. It is shown that as the intercept probability requirement is relaxed, the outage performance of the direct transmission, the artificial noise based and the relay selection schemes improves, and vice versa. This implies a trade-off between the security and reliability of the secondary transmission in the presence of eavesdropping attacks, which is referred to as the security-reliability trade-off (SRT). Furthermore, we demonstrate that the SRTs of the single-relay and multi-relay selection schemes are generally better than that of classic direct transmission. Moreover, as the number of SRs increases, the SRTs of the proposed single-relay and multi-relay selection approaches significantly improve. Finally, our numerical results show that as expected, the multi-relay selection scheme achieves a better SRT performance than the single-relay selection.
description: 13 pages, IEEE Transactions on Communications, 2014
Reaction rate uncertainties: NeNa and MgAl in AGB stars
Creators: name: Karakas, A.
name: Izzard, R.G.
name: Lugaro, M.
name: Iliadis, C.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2006

description: We study the effect of uncertainties in the proton-capture reaction rates of the NeNa and MgAl chains on nucleosynthesis due to the operation of hot bottom burning (HBB) in intermediate-mass asymptotic giant branch (AGB) stars. HBB nucleosynthesis is associated with the production of sodium, radioactive 26Al and the heavy magnesium isotopes, and it is possibly responsible for the O, Na, Mg and Al abundance anomalies observed in globular cluster stars. We model HBB with an analytic code based on full stellar evolution models so we can quickly cover a large parameter space. The reaction rates are varied first individually, then all together. This creates a knock-on effect, where an increase of one reaction rate affects production of an isotope further down the reaction chain. We find the yields of 22Ne, 23Na and 26Al to be the most susceptible to current nuclear reaction rate uncertainties.
Horizons and non-local time evolution of quantum mechanical systems
Creators: name: Casadio, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: According to general relativity, trapping surfaces and horizons are classical causal structures that arise in systems with sharply defined energy and corresponding gravitational radius. The latter concept can be extended to a quantum mechanical state simply by means of the spectral decomposition, which allows one to define an associated "horizon wave-function". Since this auxiliary wave-function contains crucial information about the causal structure of space-time, a new proposal is formulated for the time-evolution of quantum states in order to account for the fundamental classical property that outer observers cannot receive signals from inside a horizon. The simple case of a single massive free particle at rest is used throughout the paper as a toy model to illustrate the main ideas.
description: 13 pages, LaTeX with 6 pdf plots in 4 figures. Added comments
Isotopic composition of presolar spinel grain OC2: Constraining intermediate-mass asymptotic giant branch models
Creators: name: Lugaro, M.
name: Iliadis, C.
name: Nittler, L.R.
name: Lattanzio, J.C.
name: Karakas, A.I.
name: Alexander, C.M.O'D.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2006

description: We analyze the O, Mg, Al, Cr and Fe compositions predicted by detailed models of AGB stars of different masses and metallicities and discuss them in the light of the precise measurements of the composition of a single extraordinary presolar spinel grain, named OC2. Large excesses of the heavy Mg isotopes are present in this grain and thus an origin from an intermediate-mass (IM) asymptotic giant branch (AGB) star was previously proposed for it. Our IM-AGB models with temperatures at the base of the convective envelope ≃ 80 - 85 million degrees produce a good match to the composition of OC2 within the uncertainties related to reaction rates. This solution is possible if, in particular, we take the lower limit and the upper limit for the 16O(p,γ )17F and the 17O(p,α) 14N reaction rates, respectively.
Improved angular momentum evolution model for solar-like stars II. Exploring the mass dependence
Creators: name: Gallet, Florian
name: Bouvier, Jérôme
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We developed angular momentum evolution models for 0.5 and 0.8 $M_{\odot}$ stars. The parametric models include a new wind braking law based on recent numerical simulations of magnetised stellar winds, specific dynamo and mass-loss rate prescriptions, as well as core/envelope decoupling. We compare model predictions to the distributions of rotational periods measured for low mass stars belonging to star forming regions and young open clusters. Furthermore, we explore the mass dependence of model parameters by comparing these new models to the solar-mass models we developed earlier. Rotational evolution models are computed for slow, median, and fast rotators at each stellar mass. The models reproduce reasonably well the rotational behaviour of low-mass stars between 1 Myr and 8-10 Gyr, including pre-main sequence to zero-age main sequence spin up, prompt zero-age main sequence spin down, and early-main sequence convergence of the surface rotation rates. Fast rotators are found to have systematically shorter disk lifetimes than moderate and slow rotators, thus enabling dramatic pre-main sequence spin up. They also have shorter core-envelope coupling timescales, i.e., more uniform internal rotation. As to the mass dependence, lower mass stars require significantly longer core-envelope coupling timescale than solar-type ones, which results in strong differential rotation developing in the stellar interior on the early main sequence. Lower mass stars also require a weaker braking torque to account for their longer spin down timescale on the early main sequence, while they ultimately converge towards lower rotational velocities than solar-type stars on the longer term due to their reduced moment of inertia. We also find evidence that the mass-dependence of the wind braking efficiency may be related to a change of the magnetic topology in lower mass stars.
description: 17 pages, 11 figures, accepted for publication in A&A
Spin-dependent recombination and hyperfine interaction at the deep defects
Creators: name: Ivchenko, E. L.
name: Bakaleinikov, L. A.
name: Kalevich, V. K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a theoretical study of optical electron-spin orientation and spin-dependent Shockley-Read-Hall recombination taking into account the hyperfine coupling between the bound-electron spin and the nuclear spin of a deep paramagnetic center. We show that the number of master rate equations for the components of the electron-nuclear spin-density matrix is considerably reduced due to the restrictions imposed by the axial symmetry of the system under consideration. The rate equations describe the Zeeman splitting of the electron spin sublevels in the longitudinal magnetic field, the spin relaxation of free and bound electrons, and the nuclear spin relaxation in the two defect states, with one and two (singlet) bound electrons. The general theory is developed for an arbitrary value of the nuclear spin I, the magnetic-field and excitation-power dependencies of the electron and nuclear spin polarizations are calculated for the particular value of I = 1/2. The role of the nuclear spin relaxation in each of the both defect states is analyzed. The circular polarization and intensity of the edge photoluminescence as well as the dynamic nuclear spin polarization as functions of the excitation power are shown to have bell-shaped forms
description: 22 pages, 5 figures, revised the title of the bottom axis in Fig.5, corrected typos; results unchanged