cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A model for the epitaxial growth of graphene on 6H-SiC
Creators: name: Ming, Fan
name: Zangwill, Andrew
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We introduce a kinetic model for the growth of epitaxial graphene on 6H-SiC. The model applies to vicinal surfaces composed of half-unit-cell height steps where experiment shows that step flow sublimation of SiC promotes the formation and growth of graphene strips parallel to the step edges. The model parameters are effective energy barriers for the nucleation and subsequent propagation of graphene at the step edges. Using both rate equations and kinetic Monte Carlo simulations, two distinct growth regimes emerge from a study of the layer coverage and distribution of top-layer graphene strip widths as a function of total coverage, vicinal angle, and the model parameters. One regime is dominated by the coalescence of strips. The other regime is dominated by a novel "climb-over" process which facilitates the propagation of graphene from one terrace to the next. Comparing our results to scanning microscopy studies will provide the first quantitative insights into the kinetics of growth for this unique epitaxial system.
description: 6 pages 7 figures
Nuclear Magnetic Resonance Measurements in High Flat-top Pulsed Magnetic Field up to 40 T at WHMFC
Creators: name: Wei, Wenqi
name: Liu, Qinying
name: Yuan, Le
name: Zhang, Jian
name: Liu, Shiyu
name: Zhou, Rui
name: Luo, Yongkang
name: Han, Xiaotao
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Nuclear magnetic resonance (NMR) technique benefits from high magnetic field not only due to the field-enhanced measurement sensitivity and resolution, but also because it is a powerful tool to investigate field-induced physics in modern material science. In this study, we successfully performed NMR measurements in high flat-top pulsed magnetic field (FTPMF) up to 40 T. A two-stage corrected FTPMF with fluctuation less than 10 mT and duration longer than 9 ms was established. Besides, a Giga-Hz NMR spectrometer and a sample probe suitable for pulsed-field condition were developed. Both free-induction-decay and spin-echo sequences were exploited for the measurements. The derived $^{93}$Nb NMR results show that the stability and homogeneity of the FTPMF reach an order of 10$^2$ ppm / 10 ms and 10$^2$ ppm / 10 mm$^3$ respectively, which is approaching a degree of maturity for some researches on condensed matter physics.
description: 8 pages, 9 figures
Low-Frequency Noise Mitigation and Bandgap Engineering using Seismic Metamaterials for Terrestrial Gravitational Wave Observatories
Creators: name: Oh, John J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Gravitational-wave now became one of the important observational methods for studying the Universe since its first detection. However, the ground-based observatories have an inherent barrier to their detection frequency band due to the seismic and gravity gradient noises nearby the perturbation of the surroundings. A recent intriguing development of artificial structures for media called metamaterial is opening a new branch of wave mechanics and its application in various fields, in particular, suggesting a novel way of mitigating noises by controlling the media structure for propagating waves. In this paper, we propose a novel framework for handling noises in ground-based gravitational wave detectors by using wave mechanics under metamaterial media. Specifically, we suggest an application of the bandgap engineering technique for mitigating the underground effects of acoustic noises resulting from the seismic vibration in the KAGRA gravitational wave observatory.
description: 7pages, 5figures
title: Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¼ÐµÑÐ¾Ð´Ð¸ÐºÐ¸ Ð¾ÑÐµÐ½ÐºÐ¸ ÑÐ¸ÑÐºÐ¾Ð² Ð½Ð° Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ð¸ Ð½Ð° Ð¿ÑÐ¸Ð¼ÐµÑÐµ ÐÐÐ Â«Ð¢Ð¸ÑÐ°Ð½ ÐÐÐÐÐÐÐ ÐÐÐÂ»
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Development of the methodology of risk assessment at enterprises by the example of LLC Titan Engineering
Creators: name: ÐÐ¾Ð±Ð°Ð½Ð¾Ð²Ð°, ÐÐ°ÑÐ¸Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2018
Subjects: ÐÑ ÑÐ°Ð½Ð° ÑÑÑÐ´Ð°
Ð­Ð½ÐµÑÐ³ÐµÑÐ¸ÐºÐ°
Ð¾ÑÐµÐ½ÐºÐ° ÑÐ¸ÑÐºÐ¾Ð²
ÑÑÐ»Ð¾Ð²Ð¸Ñ ÑÑÑÐ´Ð°
Ð°Ð½Ð°Ð»Ð¸Ð· ÑÐ°Ð±Ð¾ÑÐ¸Ñ Ð¼ÐµÑÑ
Ð¼ÐµÑÐ¾Ð´Ð¸ÐºÐ° Ð¾ÑÐµÐ½ÐºÐ¸ Ð¿ÑÐ¾ÑÐµÑÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½ÑÑ ÑÐ¸ÑÐºÐ¾Ð²

description: Ð¡Ð¾Ð³Ð»Ð°ÑÐ½Ð¾ Ð´ÐµÐ¹ÑÑÐ²ÑÑÑÐµÐ¼Ñ Ð·Ð°ÐºÐ¾Ð½Ð¾Ð´Ð°ÑÐµÐ»ÑÑÑÐ²Ñ Ð Ð¾ÑÑÐ¸Ð¹ÑÐºÐ¾Ð¹ Ð¤ÐµÐ´ÐµÑÐ°ÑÐ¸Ð¸ Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ Ð¾ÑÑÐ°Ð½Ñ ÑÑÑÐ´Ð° ÑÐ°Ð±Ð¾ÑÐ¾Ð´Ð°ÑÐµÐ»Ñ ÐºÐ°Ð¶Ð´Ð¾Ð³Ð¾ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ñ Ð´Ð¾Ð»Ð¶ÐµÐ½ Ð¾Ð±ÐµÑÐ¿ÐµÑÐ¸ÑÑ ÑÑÐ½ÐºÑÐ¸Ð¾Ð½Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ ÑÐ¸ÑÑÐµÐ¼Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¾ÑÑÐ°Ð½Ð¾Ð¹ ÑÑÑÐ´Ð° (Ð¡Ð£ÐÐ¢). Ð¦ÐµÐ»ÑÑ Ð¼Ð°Ð³Ð¸ÑÑÐµÑÑÐºÐ¾Ð¹ Ð´Ð¸ÑÑÐµÑÑÐ°ÑÐ¸Ð¸ ÑÐ²Ð»ÑÐµÑÑÑ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¼ÐµÑÐ¾Ð´Ð¸ÐºÐ¸ Ð´Ð»Ñ Ð¾ÑÐµÐ½ÐºÐ¸ ÑÐ¸ÑÐºÐ° Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ Ð¾ÑÑÐ°Ð½Ñ ÑÑÑÐ´Ð° Ð² ÐÐÐ Â«Ð¢Ð¸ÑÐ°Ð½ ÐÐ½Ð¶Ð¸Ð½Ð¸ÑÐ¸Ð½Ð³Â». Ð ÑÐ¾Ð´Ðµ Ð²ÑÐ¿Ð¾Ð»Ð½ÐµÐ½Ð¸Ñ ÑÐ°Ð±Ð¾ÑÑ Ð°Ð½Ð°Ð»Ð¸Ð·Ð¸ÑÐ¾Ð²Ð°Ð½Ð° ÑÑÑÐµÑÑÐ²ÑÑÑÐ°Ñ ÑÐ¸ÑÑÐµÐ¼Ð° Ð¾ÑÑÐ°Ð½Ñ ÑÑÑÐ´Ð° Ð½Ð° Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ð¸, ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ð° Ð¼ÐµÑÐ¾Ð´Ð¸ÐºÐ° Ð¾ÑÐµÐ½ÐºÐ¸ ÑÐ¸ÑÐºÐ¾Ð² Ð½Ð° Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ð¸, Ð°Ð¿ÑÐ¾Ð±Ð¸ÑÐ¾Ð²Ð°Ð½Ð° Ð¸ Ð²Ð½ÐµÐ´ÑÐµÐ½Ð° Ð¼ÐµÑÐ¾Ð´Ð¸ÐºÐ° Ð¾ÑÐµÐ½ÐºÐ¸ ÑÐ¸ÑÐºÐ¾Ð² Ð½Ð° Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ð¸ ÐÐÐ Â«Ð¢Ð¸ÑÐ°Ð½ ÐÐ½Ð¶Ð¸Ð½Ð¸ÑÐ¸Ð½Ð³Â».
description: According to the current legislation of the Russian Federation in the field of labor protection, the employer of each enterprise must ensure the functioning of the OSH management system.
The aim of the master's thesis is to develop a methodology for risk assessment in the field of labor protection in OOO Titan Engineering. In the course of the work, the existing OSH system at the enterprise was analyzed, a methodology for risk assessment at the enterprise was developed, and a risk assessment methodology was developed at the enterprise of LLC Titan Engineering.
Results from electrostatic calibrations for measuring the Casimir force in the cylinder-plane geometry
Creators: name: Wei, Q.
name: Dalvit, D. A. R.
name: Lombardo, F. C.
name: Mazzitelli, F. D.
name: Onofrio, R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report on measurements performed on an apparatus aimed to study the Casimir force in the cylinder-plane configuration. The electrostatic calibrations evidence anomalous behaviors in the dependence of the electrostatic force and the minimizing potential upon distance. We discuss analogies and differences of these anomalies with respect to those already observed in the sphere-plane configuration. At the smallest explored distances we observe frequency shifts of non-Coulombian nature preventing the measurement of the Casimir force in the same range. We also report on measurement performed in the parallel plane configuration, showing that the dependence on distance of the minimizing potential, if present at all, is milder than in the sphere-plane or cylinder-plane geometries. General considerations on the interplay between the distance-dependent minimizing potential and the precision of Casimir force measurements in the range relevant to detect the thermal corrections for all geometries are finally reported.
Passerella ciclopedonale d’attraversamento sui binari
Creators: name: Codiroli, Filippo
Publisher: name: Scuola Universitaria della Svizzera Italiana (SUPSI)
Year: 2019

description: La situazione attuale riguardante la mobilità ciclopedonale nella stazione di Lugano-Paradiso, implica l’utilizzo del sottopassaggio ubicato in Via E. Bosia per attraversare l’infrastruttura ferroviaria. Il dispendioso percorso ha portato a molte riflessioni sulla necessità di un collegamento diretto che avrebbe incrementato la sicurezza e l’efficienza dei diversi flussi di percorso. Una passerella ciclopedonale permette di far fronte alle esigenze esposte dalle ferrovie federali. A tale scopo è stato progettato un collegamento che rispetti, in primo luogo, i vincoli dettati dalla presenza della linea elettrica ferroviaria e in secondo luogo, le esigenze legate ad estetica ed efficienza.
Come educare al Language Awareness una classe di lingua: approcci plurilingue nella Scuola Media
Creators: name: Figini, Eleonora
Publisher: name: Scuola Universitaria della Svizzera Italiana (SUPSI)
Year: 2014

description: Questo lavoro di diploma mi ha offerto la possibilità di lavorare con le lingue, con un approccio aperto in cui le preconoscenze dei miei allievi sono diventate la base da cui partire per costruire nuove conoscenze in ambito linguistico. Un insegnamento plurilinguista che valorizza tutte le lingue e tutte le culture rappresenta un’alternativa alle monoculture. Attraverso attività di sensibilizzazione verso le lingue conosciute dagli alunni ho tentato di verificare se fosse possibile valorizzare le lingue rappresentate in classe e cambiare una certa attitudine negativa nei confronti di alcune lingue poco amate, tra cui il tedesco. I risultati sono stati positivi per ciò che concerne il coinvolgimento e la crescita di motivazione degli alunni per attività basate sulla presenza di più lingue nella stessa lezione; l’interferenza linguistica riscontrata durante alcune attività è sicuramente un limite da tenere in considerazione. Questa ricerca ha contribuito a rendermi consapevole degli aspetti positivi e dei limiti di un percorso basato sul plurilinguismo, che dovrebbe tuttavia sempre essere accolto come opportunità di crescita formativa, personale e sociale. Relatore: Gé Stoks. Materia: Tedesco.
A probabilistic approach to the asymptotics of the length of the longest alternating subsequence
Creators: name: Houdré, Christian
name: Restrepo, Ricardo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 60C05, 60F05, 60G15, 60G17, 05A16

description: Let $LA_{n}(τ)$ be the length of the longest alternating subsequence of a uniform random permutation $τ\in[n]$. Classical probabilistic arguments are used to rederive the asymptotic mean, variance and limiting law of $LA_{n}(τ)$. Our methodology is robust enough to tackle similar problems for finite alphabet random words or even Markovian sequences in which case our results are mainly original. A sketch of how some cases of pattern restricted permutations can also be tackled with probabilistic methods is finally presented.
description: Final version with a new title and various extensions
Are inertial vacua equivalent in Lorentz-violating theories? Does it matter?
Creators: name: Costa, Bruno Arderucio
name: Bonder, Yuri
name: Juárez-Aubry, Benito A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Several approaches to quantum gravity suggest violations of Lorentz symmetry as low-energy signatures. This article uses a concrete Lorentz-violating quantum field theory to study different inertial vacua. We show that they are unitarily inequivalent and that the vacuum in one inertial frame appears, in a different inertial frame, to be populated with particles of arbitrarily high momenta. At first sight, this poses a critical challenge to the physical validity of Lorentz-violating theories, since we do not witness vacuum excitations by changing inertial frames. Nevertheless, we demonstrate that inertial Unruh-De Witt detectors are insensitive to these effects. We also discuss the Hadamard condition for this Lorentz-violating theory.
description: Revised and extended version. 12 pages, 1 figure
title: ÐÐ¾Ð½ÐµÑÐ½Ð¾-ÑÐ»ÐµÐ¼ÐµÐ½ÑÐ½Ð¾Ðµ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ Ð¿Ð¾Ð²ÐµÐ´ÐµÐ½Ð¸Ñ Ð³Ð¸Ð¿ÐµÑÑÐ¿ÑÑÐ³Ð¾Ð³Ð¾ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ð°, Ð¿Ð¾Ð´Ð²ÐµÑÐ¶ÐµÐ½Ð½Ð¾Ð³Ð¾ ÑÐ¶Ð¸Ð¼Ð°ÑÑÐ¸Ð¼ Ð½Ð°Ð³ÑÑÐ·ÐºÐ°Ð¼
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Finite element modeling of the behavior of a hyperelastic material subjected to compressive loads
Creators: name: ÐÑÐ°ÑÐ¾Ð²ÑÐºÐ°Ñ, ÐÐ°ÑÑÑ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: Ð½ÐµÐ»Ð¸Ð½ÐµÐ¹Ð½ÑÐµ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ñ
Ð¿Ð°ÐºÐµÑ
Ð½ÐµÐ¾-Ð³ÑÐº
Ð¼ÑÐ½Ð¸-ÑÐ¸Ð²Ð»Ð¸Ð½
ÐµÐ¾Ñ
Ð³Ð¸Ð¿ÐµÑÑÐ¿ÑÐ³Ð°Ñ Ð¼Ð¾Ð´ÐµÐ»Ñ
Ð·Ð°Ð´Ð°ÑÐ° Ð»ÑÐ¼Ðµ
nonlinear materials
packer
neo-hooke
mooney-rivlin
yeoh
hyperelastic model
the lame problem

description: Ð¢ÐµÐ¼Ð° ÑÐ°Ð±Ð¾ÑÑ - ÐÐ¾Ð½ÐµÑÐ½Ð¾-ÑÐ»ÐµÐ¼ÐµÐ½ÑÐ½Ð¾Ðµ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ Ð¿Ð¾Ð²ÐµÐ´ÐµÐ½Ð¸Ñ Ð³Ð¸Ð¿ÐµÑÑÐ¿ÑÑÐ³Ð¾Ð³Ð¾ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ð°, Ð¿Ð¾Ð´Ð²ÐµÑÐ¶ÐµÐ½Ð½Ð¾Ð³Ð¾ ÑÐ¶Ð¸Ð¼Ð°ÑÑÐ¸Ð¼ Ð½Ð°Ð³ÑÑÐ·ÐºÐ°Ð¼. Ð§Ð¸ÑÐ»ÐµÐ½Ð½ÑÐµ ÑÐ°ÑÑÐµÑÑ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÑÑ Ð¿ÑÐ¸ Ð¿Ð¾Ð¼Ð¾ÑÐ¸ Ð¼ÐµÑÐ¾Ð´Ð° ÐºÐ¾Ð½ÐµÑÐ½ÑÑ ÑÐ»ÐµÐ¼ÐµÐ½ÑÐ¾Ð² Ð² Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ðµ ANSYS. Ð ÑÐ°Ð±Ð¾ÑÐµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ñ Ð¼ÐµÑÐ¾Ð´Ñ ÑÐ¸ÑÐ»ÐµÐ½Ð½Ð¾Ð³Ð¾ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð³Ð¸Ð¿ÐµÑÑÐ¿ÑÑÐ³Ð¸Ñ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ð¾Ð² Ñ Ð¿Ð¾Ð¼Ð¾ÑÑÑ ÑÐ¿ÑÑÐ³Ð¸Ñ Ð¿Ð¾ÑÐµÐ½ÑÐ¸Ð°Ð»Ð¾Ð² ÐÐµÐ¾-ÐÑÐºÐ°, ÐÑÐ½Ð¸-Ð Ð¸Ð²Ð»Ð¸Ð½Ð° Ð¸ ÐÐ¾ÑÐ°, Ð¿ÑÐ¾Ð¸Ð·Ð²ÐµÐ´ÐµÐ½Ð° Ð°Ð¿Ð¿ÑÐ¾ÐºÑÐ¸Ð¼Ð°ÑÐ¸Ñ ÑÐºÑÐ¿ÐµÑÐ¸Ð¼ÐµÐ½ÑÐ°Ð»ÑÐ½ÑÑ Ð´Ð°Ð½Ð½ÑÑ Ñ ÑÐµÐ»ÑÑ Ð½Ð°Ð¹ÑÐ¸ ÐºÐ¾Ð½ÑÑÐ°Ð½ÑÑ Ð´Ð»Ñ ÑÐ¿ÑÑÐ³Ð¸Ñ Ð¿Ð¾ÑÐµÐ½ÑÐ¸Ð°Ð»Ð¾Ð², ÑÐ¸ÑÐ»ÐµÐ½Ð½Ð¾ Ð¸ Ð°Ð½Ð°Ð»Ð¸ÑÐ¸ÑÐµÑÐºÐ¸ ÑÐµÑÐµÐ½Ð° Ð·Ð°Ð´Ð°ÑÐ° ÐÑÐ¼Ðµ Ð´Ð»Ñ Ð³Ð¸Ð¿ÐµÑÑÐ¿ÑÑÐ³Ð¸Ñ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ð¾Ð², ÑÐµÑÐµÐ½Ð¸Ðµ Ð·Ð°Ð´Ð°ÑÐ¸ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¾ Ð½Ð° ÑÑÑÐ¾Ð¹ÑÐ¸Ð²Ð¾ÑÑÑ, ÐºÑÐ¾Ð¼Ðµ ÑÐ¾Ð³Ð¾, ÑÐµÑÐµÐ½Ð° Ð·Ð°Ð´Ð°ÑÐ° ÐÑÐ¼Ðµ Ð´Ð»Ñ ÑÐ¾Ð½ÐºÐ¾ÑÑÐµÐ½Ð½Ð¾Ð³Ð¾ Ð³Ð¸Ð¿ÐµÑÑÐ¿ÑÑÐ³Ð¾Ð³Ð¾ ÑÐ¸Ð»Ð¸Ð½Ð´ÑÐ°. Ð¢Ð°ÐºÐ¶Ðµ Ð² ÑÐ°Ð±Ð¾ÑÐµ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´Ð¸ÑÑÑ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ Ð½Ð°Ð¿ÑÑÐ¶ÐµÐ½Ð½Ð¾-Ð´ÐµÑÐ¾ÑÐ¼Ð¸ÑÐ¾Ð²Ð°Ð½Ð½Ð¾Ð³Ð¾ ÑÐ¾ÑÑÐ¾ÑÐ½Ð¸Ñ Ð¿Ð°ÐºÐµÑÐ°.
description: The topic of the graduate qualification work is the finite element modeling of the behavior of a hyperelastic material subjected to compressive loads. Numerical calculations are performed using the finite element method in the ANSYS program. The work considers methods for numerical simulation of hyperelastic materials using the hyperelastic models of Neo-Hooke, Mooney-Rivlin and Eoh, the fitting the experimental data curve in order to find constants for hyperelastic models, analytical and numerical solution of the Lame problem for hyperelastic materials, analysis of the solution stability, in addition, the Lame problem for a thin-walled hyperelastic cylinder is solved. The work also includes modeling of the deformed state of the packer.
Cooperation principle, stability and bifurcation in random complex dynamics
Creators: name: Sumi, Hiroki
Publisher: name: arXiv
Year: 2010
Subjects: subject: Dynamical Systems (math.DS)
subject: Complex Variables (math.CV)
subject: Geometric Topology (math.GT)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 37F10, 37H10

description: We investigate random complex dynamics of rational or polynomial maps on the Riemann sphere. We show that regarding random complex dynamics of polynomials, generically, the chaos of the averaged system disappears at any point in the Riemann sphere due to the automatic coopeartion of many kinds of maps in the system, even though each map of the system has a chaotic part. Moreover, we show that (1) the set of stable systems is open and dense in the space of random dynamical systems of polynomials, and (2) for a stable system, there exist at most finitely many minimal sets and each minimal set is attracting. These (1) and (2) solve a random analogy of the most famous open conjecture in complex dynamics "hyperbolic rational maps are dense in the space of rational maps." Furthermore, we show that for a stable system, the orbit of a Hölder continuous function under the transition operator tends exponentially fast to the finite-dimensional space $U$ of finite linear combinations of unitary eigenvectors of the transition operator. From this, we obtain that the spectrum of the transition operator acting on the space of Hölder continuous functions has a gap between the set of unitary eigenvalues and the rest. Combining this with the perturbation theory for linear operators, we obtain that for a stable system constructed by a finite family of rational maps, the projection to the space $U$ depends real-analytically on the probability parameters. By taking a partial derivative of the function of probability of tending to a minimal set with respect to a probability parameter, we introduce a complex analogue of the Takagi function, which is a new concept. Many new phenomena which can hold in random complex dynamics but cannot hold in usual iteration dynamics of a single rational map are found and systematically investigated.
description: Published in Adv. Math. 234 (2013) 697--734. 40 pages, 6 figures
Correlated phenomena studied by ARPES : from 3d to 4f systems
Creators: name: Zonno, Marta
Publisher: name: University of British Columbia
Year: 2020

description: The physics of strongly correlated materials is at the heart of current condensed matter research. The inclusion of interactions in these materials between electron themselves or with other excitations intertwines various degrees of freedom (orbital, spin, charge and lattice), leading to a number of novel phenomena like Mott-Hubbard and charge-transfer insulators, high-temperature superconductivity and mixed-valence and Kondo physics. This thesis focuses on the study of two classes of correlated materials: copper-oxide high-temperature superconductors, whose correlated physics is driven by the localized nature of the half-filled Cu 3d-orbitals, and the rare-earth hexaborides, which are characterized by the strongly correlated 4f-shell. Recently, it has been shown that the interplay between different mechanisms underlying the formation of the superconducting condensate in the hole-doped bi-layer Bi₂Sr₂CaCu₂O₈₊δ can be addressed in the time domain by means of time- and angle-resolved photoemission spectroscopy (TR-ARPES). Using this technique, the primary role of phase coherence has been established. By exploiting the same dynamical experimental approach, we show that such scenario also describes the ultrafast collapse of superconductivity in the single-layer compound Bi₂Sr₂CuO₆₊δ. Moreover, by performing a comprehensive study on different doping levels of both single- and bi-layer compounds, we provide new insights on the temperature evolution of the nodal quasiparticle spectral weight. The second part of the thesis focuses on electron-doped cuprates, addressing the putative relation between the spectroscopically observed pseudogap and the robust antiferromagnetic order. Employing TR-ARPES as a tool to perform a detailed temperature dependent investigation allows us to explicitly link the momentum-resolved pseudogap spectral features to the evolution of the short-range spin-fluctuations in the optimally-doped Nd₂-xCe₂CuO₄. Lastly, we make use of chemical substitution to investigate the mixed-valent character of the rare-earth hexaboride SmxLa₁-xB₆ series. Our combined ARPES and x-ray absorption measurements reveal a departure from a monotonic evolution of the Sm valence as a function of x and the possible emergence of a mixed-valent impurity regime.
Will ALMA Reveal the True Core Mass Function of Protoclusters?
Creators: name: Padoan, Paolo
name: Pelkonen, Veli-Matti
name: Juvela, Mika
name: Haugbølle, Troels
name: Nordlund, Åke
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Characterizing prestellar cores in star-forming regions is an important step towards the validation of theoretical models of star formation. Thanks to their sub-arcsecond resolution, ALMA observations can potentially provide samples of prestellar cores up to distances of a few kpc, where regions of massive star formation can be targeted. However, the extraction of real cores from dust-continuum observations of turbulent star-forming clouds is affected by complex projection effects. In this work, we study the problem of core extraction both in the idealized case of column-density maps and in the more realistic case of synthetic 1.3\,mm ALMA observations. The analysis is carried out on 12 regions of high column density from our 250 pc simulation. We find that derived core masses are highly unreliable, with only {\em a weak correlation between the masses of cores selected in the synthetic ALMA maps and those of the corresponding three-dimensional cores}. The fraction of real three-dimensional cores detected in the synthetic maps increases monotonically with mass and remains always below 50\%. Above $\sim 1\,M_{\odot}$, the core mass function derived from the column-density maps is steeper than that of the three-dimensional cores, while the core mass function from the synthetic ALMA maps has a slope closer to that of the real three-dimensional cores. Because of the mass uncertainties, proper guidance from realistic simulations is essential if ALMA observations of protoclusters at kpc distances are to be used to test star-formation models.
description: 20 pages, 21 figures, MNRAS, in press
Analysis of the new Crystal Ball data on $K^-p\toπ^0Λ$ reaction with beam momenta of $514\sim 750$ MeV/$c$
Creators: name: Gao, Puze
name: Zou, B. S.
name: Sibirtsev, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The Crystal Ball Collaboration has recently reported the differential cross sections and $Λ$ polarization for the reaction $K^-p\rightarrow π^0Λ$ using an incident $K^-$ beam with momenta between 514 and 750 MeV/$c$. We make a partial wave analysis for this process with an effective Lagrangian approach and study the properties of some $Σ$ resonances around this energy range. With the inclusion of the 4-star resonances $Σ(1189)$, $Σ^*(1385)$, $Σ(1670){3\over 2}^-$, $Σ(1775){5\over 2}^-$, as well as a $Σ(1635){1\over 2}^+$, which is compatible with the 3-star $Σ(1660){1\over 2}^+$ in PDG, our results can well reproduce the experimental data. The parameters on the $Σ$ resonances and related couplings are studied.
description: Polarization data from the Crystal Ball Collaboration are included for the fit
Continuous-Time Quantum Walks: Models for Coherent Transport on Complex Networks
Creators: name: Muelken, Oliver
name: Blumen, Alexander
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: This paper reviews recent advances in continuous-time quantum walks (CTQW) and their application to transport in various systems. The introduction gives a brief survey of the historical background of CTQW. After a short outline of the theoretical ideas behind CTQW and of its relation to classical continuous-time random walks (CTRW) in Sec.~2, implications for the efficiency of the transport are presented in Sec.~3. The fourth section gives an overview of different types of networks on which CTQW have been studied so far. Extensions of CTQW to systems with long-range interactions and with static disorder are discussed in section V. Systems with traps, i.e., systems in which the walker's probability to remain inside the system is not conserved, are presented in section IV. Relations to similar approaches to the transport are studied in section VII. The paper closes with an outlook on possible future directions.
description: review article to appear in Physics Reports, 39 pages, 44 figures
title: Understanding resilience in later life in a low resource setting
Creators: name: Population, African
Publisher: name: African Population and Health Research Centre
Year: 2017

description: Estimates indicate that close to 60% of the urban population in Kenya live in slums and informal settlements.
Further, a growing number of migrants are ageing 'in situ', resulting in an increasing number of older people
living in slum areas Ageing in these setting can be challenging particularly given the lack of formal support
systems. Given this context, this study seeks to better understand resilience among older people in coping with
stresses and shocks, and how some are able to adapt, and to emerge with better health and socio-economic outcomes
relative to other older people living in the same environment and exposed to the same conditions. A mixed-methods
approach that combines secondary analysis of qualitative and quantitatve data was used to compare individuals'
exposure to shocks and make causal inferences on factors associated with resilience. For the quantitative arm,
longitudinal data from the Nairobi Urban Heath Demographic and Surveillance System (NUHDSS) were used. The data
were collected between 2006 and 2009 in two slums of Nairobi (Korogocho and Viwandani) on an APHRC research program
titled 'Urbanization, Poverty and Health Dynamics (UPHD).The qualitative arm involved in-depth interviews with a
purposive sample drawn from the survey participants.The in-depth interviews seeked to answer how and why individuals
emerged as most resilient on the one hand, or the most vulnerable to shocks.
The findings highlighted factors which predispose some individuals to be more or less resilient than others. This
information is useful for programmes seeking to improve the lives of poor people by enhancing their capabilities
and resourcefulness in drawing upon existing capital.
On Conjectures of Classical and Quantum Correlations in Bipartite States
Creators: name: Zhang, Lin
name: Wu, Junde
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, two conjectures which were proposed in [Phys. Rev. A \textbf{82}, 052122(2010)] on the correlations in a bipartite state $ρ^{AB}$ are studied. If the mutual information $I\Pa{ρ^{AB}}$ between two quantum systems $A$ and $B$ before any measurement is considered as the total amount of correlations in the state $ρ^{AB}$, then it can be separated into two parts: classical correlations and quantum correlations. The so-called classical correlations $C\Pa{ρ^{AB}}$ in the state $ρ^{AB}$, defined by the maximizing mutual information between two quantum systems $A$ and $B$ after von Neumann measurements on system $B$, we show that it is upper bounded by the von Neumann entropies of both subsystems $A$ and $B$, this answered the conjecture on the classical correlation. If the quantum correlations $Q\Pa{ρ^{AB}}$ in the state $ρ^{AB}$ is defined by $Q\Pa{ρ^{AB}}= I\Pa{ρ^{AB}} - C\Pa{ρ^{AB}}$, we show also that it is upper bounded by the von Neumann entropy of subsystem $B$. It is also obtained that $Q\Pa{ρ^{AB}}$ is upper bounded by the von Neumann entropy of subsystem $A$ for a class of states.
description: 6 pages, LaTeX, Concluding Remarks is added and some refereces are listed also. To appear in J. Phys. A
Deep learning predicted elliptic flow of identified particles in heavy-ion collisions at the RHIC and LHC energies
Creators: name: Mallick, Neelkamal
name: Prasad, Suraj
name: Mishra, Aditya Nath
name: Sahoo, Raghunath
name: Barnaföldi, Gergely Gábor
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Recent developments on a deep learning feed-forward network for estimating elliptic flow ($v_2$) coefficients in heavy-ion collisions have shown us the prediction power of this technique. The success of the model is mainly the estimation of $v_2$ from final state particle kinematic information and learning the centrality and the transverse momentum ($p_{\rm T}$) dependence of $v_2$. The deep learning model is trained with Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV minimum bias events simulated with a multiphase transport model (AMPT). We extend this work to estimate $v_2$ for light-flavor identified particles such as $π^{\pm}$, $\rm K^{\pm}$, and $\rm p+\bar{p}$ in heavy-ion collisions at RHIC and LHC energies. The number of constituent quark (NCQ) scaling is also shown. The evolution of $p_{\rm T}$-crossing point of $v_2(p_{\rm T})$, depicting a change in meson-baryon elliptic flow at intermediate-$p_{\rm T}$, is studied for various collision systems and energies. The model is further evaluated by training it for different $p_{\rm T}$ regions. These results are compared with the available experimental data wherever possible.
description: Same as the published version
Handle attaching in wrapped Floer homology and brake orbits in classical Hamiltonian systems
Creators: name: Irie, Kei
Publisher: name: arXiv
Year: 2010
Subjects: subject: Symplectic Geometry (math.SG)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 34C25, 53D40

description: The objective of this note is to prove an existence result for brake orbits in classical Hamiltonian systems (which was first proved by S.V.Bolotin) by using Floer theory. To this end, we compute an open string analogue of symplectic homology (so called wrapped Floer homology) of some domains in cotangent bundles, which appear naturally in the study of classical Hamiltonian systems. The main part of the computations is to show invariance of wrapped Floer homology under certain handle attaching to domains.
description: 31 pages, close to the published version
An Overview of Portable Distributed Techniques
Creators: name: Bansal, Sanjay
name: Pandey, Nirved
Publisher: name: arXiv
Year: 2011
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: In this paper, we reviewed of several portable parallel programming paradigms for use in a distributed programming environment. The Techniques reviewed here are portable. These are mainly distributing computing using MPI pure java based, MPI native java based (JNI) and PVM. We will discuss architecture and utilities of each technique based on our literature review. We explored these portable distributed techniques in four important characteristics scalability, fault tolerance, load balancing and performance. We have identified the various factors and issues for improving these four important characteristics.
description: International Journal of Computer Science Issues online at http://www.ijcsi.org
Fermionic Quantum Approximate Optimization Algorithm
Creators: name: Yoshioka, Takuya
name: Sasada, Keita
name: Nakano, Yuichiro
name: Fujii, Keisuke
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum computers are expected to accelerate solving combinatorial optimization problems, including algorithms such as Grover adaptive search and quantum approximate optimization algorithm (QAOA). However, many combinatorial optimization problems involve constraints which, when imposed as soft constraints in the cost function, can negatively impact the performance of the optimization algorithm. In this paper, we propose fermionic quantum approximate optimization algorithm (FQAOA) for solving combinatorial optimization problems with constraints. Specifically FQAOA tackle the constrains issue by using fermion particle number preservation to intrinsically impose them throughout QAOA. We provide a systematic guideline for designing the driver Hamiltonian for a given problem Hamiltonian with constraints. The initial state can be chosen to be a superposition of states satisfying the constraint and the ground state of the driver Hamiltonian. This property is important since FQAOA reduced to quantum adiabatic computation in the large limit of circuit depth p and improved performance, even for shallow circuits with optimizing the parameters starting from the fixed-angle determined by Trotterized quantum adiabatic evolution. We perform an extensive numerical simulation and demonstrates that proposed FQAOA provides substantial performance advantage against existing approaches in portfolio optimization problems. Furthermore, the Hamiltonian design guideline is useful not only for QAOA, but also Grover adaptive search and quantum phase estimation to solve combinatorial optimization problems with constraints. Since software tools for fermionic systems have been developed in quantum computational chemistry both for noisy intermediate-scale quantum computers and fault-tolerant quantum computers, FQAOA allows us to apply these tools for constrained combinatorial optimization problems.
description: Accepted for publication in Physical Review Research on March 29, 2023. 16 pages, 8 figures
How media hype affects our physics teaching: A case study on quantum computing
Creators: name: Meyer, Josephine C.
name: Passante, Gina
name: Pollock, Steven J.
name: Wilcox, Bethany R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Physics Education (physics.ed-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Popular media is an unspoken yet ever-present element of the physics landscape and a tool we can utilize in our teaching. It is also well-understood that students enter the physics classroom with a host of conceptions learned from the world at large. It stands to reason, then, to suspect that media coverage may be a major contributing factor to students' views on physical phenomena and the nature of science - one whose influence will only grow amid the 21st century digital age. Yet the role of the media in shaping physics teaching and learning has remained largely unexplored in the physics education research (PER) literature so far. Here, we explore the phenomenon of media hype from a theoretical and practical perspective: how media rhetoric of current topics in science and technology evolves, and how it affects students and instructors. We argue that media hype of cutting-edge science can be a double-edged sword for educators, with the same amped-up rhetoric that motivates students to enter the classroom tending to result in inflated preconceptions of what the science and technology can actually do. We draw on examples related to teaching quantum computing as a case study, though the findings we present should generalize to other topics garnering significant media attention - from exoplanets to graphene to batteries for electric vehicles. We conclude with a set of practical recommendations for physics teachers at all levels who wish to be more cognizant of the role exposure to popular media has on students and to tailor our teaching accordingly.
description: Accepted to The Physics Teacher. This copy has not yet been copy-edited
Supplementary document for Highly-time-resolved FMCW LiDAR with synchronously-nonlinearity-corrected acquisition for dynamic locomotion - 6229089.pdf
Creators: name: Sun, Caiming
name: chen, Zhen
name: Ye, Shusheng
name: Lin, Jing
name: Shi, Wu
name: Li, Binghui
name: Teng, Fei
name: Li, Xuejin
name: Zhang, Aidong
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Photonics, Optoelectronics and Optical Communications

description: Supplement 1
Automatic Alignment in Higher-Order Probabilistic Programming Languages
Creators: name: Lundén, Daniel
name: Çaylak, Gizem
name: Ronquist, Fredrik
name: Broman, David
Publisher: name: arXiv
Year: 2023
Subjects: subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: Probabilistic Programming Languages (PPLs) allow users to encode statistical inference problems and automatically apply an inference algorithm to solve them. Popular inference algorithms for PPLs, such as sequential Monte Carlo (SMC) and Markov chain Monte Carlo (MCMC), are built around checkpoints -- relevant events for the inference algorithm during the execution of a probabilistic program. Deciding the location of checkpoints is, in current PPLs, not done optimally. To solve this problem, we present a static analysis technique that automatically determines checkpoints in programs, relieving PPL users of this task. The analysis identifies a set of checkpoints that execute in the same order in every program run -- they are aligned. We formalize alignment, prove the correctness of the analysis, and implement the analysis as part of the higher-order functional PPL Miking CorePPL. By utilizing the alignment analysis, we design two novel inference algorithm variants: aligned SMC and aligned lightweight MCMC. We show, through real-world experiments, that they significantly improve inference execution time and accuracy compared to standard PPL versions of SMC and MCMC.
Non-Lifshitz invariants corrections to Dzyaloshinskii-Moriya interaction energy
Creators: name: Sticlet, Doru
name: Piéchon, Frédéric
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the continuum limit of two-dimensional chiral magnets in which Dzyaloshinskii-Moriya interaction (DMI) is due to the interplay between a smooth magnetic texture and spin-orbit coupling. The resulting free-energy density of the system contains linear terms in the spatial gradient of the magnetic texture, which mark an instability of the system towards the formation of nontrivial magnetic orders such as skyrmions or chiral domain walls. We perform a microscopic analysis of DMI tensors responsible for this contribution to free energy based on a Berry phase formulation in the mixed space of momentum and position, and reveal that they exhibit non-Lifshitz invariants features. In particular, a perturbation theory shows in the case of Rashba spin-orbit interactions the presence of non-Lifshitz invariants to third order in the small spin-orbit interaction and fourth order in the small exchange coupling. The higher-order terms may even lead to an enhancement of DMI interaction at strong spin-orbit coupling due to divergences in the density of states at the bottom of the conduction band. Finally, we also study the DMI free energy generated from Rashba spin-orbit interaction in different symmetry groups.
description: 17 pages, 2 figures
Kalikow-type decomposition for multicolor infinite range particle systems
Creators: name: Galves, A.
name: Garcia, N. L.
name: Löcherbach, E.
name: Orlandi, E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: We consider a particle system on $\mathbb{Z}^d$ with real state space and interactions of infinite range. Assuming that the rate of change is continuous we obtain a Kalikow-type decomposition of the infinite range change rates as a mixture of finite range change rates. Furthermore, if a high noise condition holds, as an application of this decomposition, we design a feasible perfect simulation algorithm to sample from the stationary process. Finally, the perfect simulation scheme allows us to forge an algorithm to obtain an explicit construction of a coupling attaining Ornstein's $\bar{d}$-distance for two ordered Ising probability measures.
description: Published in at http://dx.doi.org/10.1214/12-AAP882 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Additional file 3 of Transcriptomic analysis reveals the regulatory role of quorum sensing in the Acinetobacter baumannii ATCC 19606 via RNA-seq
Creators: name: Xiong, Li
name: Yi, Fanli
name: Yu, Qiuju
name: Huang, Xiyue
name: Ao, Keping
name: Wang, Yuanfang
name: Xie, Yi
Publisher: name: figshare
Year: 2022
Subjects: subject: Microbiology
subject: FOS: Biological sciences

description: Additional file 3: Figure S1. The PCA plot by ggplot2. The △abaI mutant and wild type (wt) were clustered into two groups based on the gene expression matrix. Figure S2. Heatmap of the Pearson correlation coefficient between the samples by corrplot. Figure S3. The map of the enriched KEGG pathways from the KEGG database[1, 2]. Green rectangles represented the downregulated genes and red rectangles represented the upregulated genes. Blue boxes represented the genes hyperlinked to KO entries, and white boxes represented the genes which were not hyperlinked to KO entries. (A) Phenylalanine metabolism (ko00360). (B) The type VI secretion system of bacterial secretion system (ko03070). Figure S4. The map of the enriched KEGG pathway “propanoate metabolism (ko00640)” from the KEGG database[1, 2]. Green rectangles represented the downregulated genes and red rectangles represented the upregulated genes. Blue boxes represented the genes hyperlinked to KO entries, and white boxes represented the genes which were not hyperlinked to KO entries.
Macroscopic quantum tunneling in nanoelectromechanical systems
Creators: name: Sillanpaa, Mika A.
name: Khan, Raphael
name: Heikkila, Tero T.
name: Hakonen, Pertti J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The experimental observation of quantum phenomena in mechanical degrees of freedom is difficult, as the systems become linear towards low energies and the quantum limit, and thus reside in the correspondence limit. Here we investigate how to access quantum phenomena in flexural nanomechanical systems which are strongly deflected by a voltage. Near a metastable point, one can achieve a significant nonlinearity in the electromechanical potential at the scale of zero point energy. The system could then escape from the metastable state via macroscopic quantum tunneling (MQT). We consider two model systems suspended atop a voltage gate, namely, a graphene sheet, and a carbon nanotube. We find that the experimental demonstration of the phenomenon is currently possible but demanding, since the MQT crossover temperatures fall in the milli-Kelvin range. A carbon nanotube is suggested as the most promising system.
description: 8 pages
Design, fabrication and large scale qualification of cosmic muon veto scintillator detectors
Creators: name: Saraf, Mandar
name: Chinnappan, Pandi Raj
name: Deodhar, Aditya
name: Jangra, Mamta
name: Krishnamoorthi, J.
name: Majumder, Gobinda
name: Padmavathy, Veera
name: Ravindran, K. C.
name: Shah, Raj Bhupen
name: Shinde, Ravindra
name: Satyanarayana, B.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The INO collaboration is designing a cosmic muon veto detector (CMVD) to cover the mini-ICAL detector which is operational at the IICHEP transit campus, Madurai in South India. The aim of the CMVD is to study the feasibility of building an experiment to record rare events at a shallow depth of around 100 m, and use plastic scintillators to veto atmospheric muons from those produced by the rare interactions within the target mass of the detector. The efficiency of such a veto detector should be better than 99.99% and false positive rate of less than $10^{-5}$. The CMVD is being built using extruded plastic scintillator (EPS) strips to detect and tag atmospheric muons. More than 700 EPS strips are required to build the CMVD. Two EPS strips are pasted together to make a di-counter (DC) and wavelength shifting fibres are embedded inside the EPS strips to trap the scintillation light generated by a passing cosmic ray muon and transmit it as secondary photons to the Silicon Photo-Multipliers (SiPMs) mounted at the two ends of the DCs. Since the efficiency requirement of the veto detector is rather high, it is imperative to thoroughly test each and every component used for building the CMVD. A cosmic ray muon telescope has been setup using the DCs to qualify all the DCs that will be fabricated. In this paper we will discuss the details of the design and fabrication of the DCs, and the cosmic muon setup and the electronics used for their testing and the test results.
Learning Topology-Preserving Data Representations
Creators: name: Trofimov, Ilya
name: Cherniavskii, Daniil
name: Tulchinskii, Eduard
name: Balabin, Nikita
name: Burnaev, Evgeny
name: Barannikov, Serguei
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Algebraic Topology (math.AT)
subject: K-Theory and Homology (math.KT)
subject: Symplectic Geometry (math.SG)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We propose a method for learning topology-preserving data representations (dimensionality reduction). The method aims to provide topological similarity between the data manifold and its latent representation via enforcing the similarity in topological features (clusters, loops, 2D voids, etc.) and their localization. The core of the method is the minimization of the Representation Topology Divergence (RTD) between original high-dimensional data and low-dimensional representation in latent space. RTD minimization provides closeness in topological features with strong theoretical guarantees. We develop a scheme for RTD differentiation and apply it as a loss term for the autoencoder. The proposed method "RTD-AE" better preserves the global structure and topology of the data manifold than state-of-the-art competitors as measured by linear correlation, triplet distance ranking accuracy, and Wasserstein distance between persistence barcodes.
Two-point functions in (loop) quantum cosmology
Creators: name: Calcagni, Gianluca
name: Gielen, Steffen
name: Oriti, Daniele
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The path-integral formulation of quantum cosmology with a massless scalar field as a sum-over-histories of volume transitions is discussed, with particular but non-exclusive reference to loop quantum cosmology. Exploiting the analogy with the relativistic particle, we give a complete overview of the possible two-point functions, pointing out the choices involved in their definitions, deriving their vertex expansions and the composition laws they satisfy. We clarify the origin and relations of different quantities previously defined in the literature, in particular the tie between definitions using a group averaging procedure and those in a deparametrized framework. Finally, we draw some conclusions about the physics of a single quantum universe (where there exist superselection rules on positive- and negative-frequency sectors and different choices of inner product are physically equivalent) and multiverse field theories where the role of these sectors and the inner product are reinterpreted.
description: 29 pages; v2: typos corrected, references added