cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Flare echos from relaxation shocks in perturbed relativistic jets
Creators: name: de Clairfontaine, Gaëtan Fichet
name: Meliani, Zakaria
name: Zech, Andreas
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: One of the main scenarios to account for the multi-wavelength flux variability observed in relativistic jets of AGNs is based on diffusive shock acceleration of a population of relativistic electrons on internal shocks of various origins. Any complete AGN emission scenario has to be able to explain the wide range of observed variability time scales between the radio and gamma-ray band. In addition constraints are also provided by very-long-baseline interferometry (VLBI), which shows a large variety of moving and standing emission zones with distinct behaviors. We aim to characterize the evolution of stationary and moving emission zones in the jet and to study their multi-wavelength signatures through emission maps and light curves. We focus our study on flare events that occur during strong interactions between moving ejecta and stationary recollimation shocks. We simulate relativistic jets with the magneto-hydrodynamic code MPI-AMRVAC and inject non-thermal particle distributions of electrons in shock regions. We follow the propagation of a moving shock and its interactions with a structure of standing re-collimation shocks in the jet. Synchrotron emission and radiative transfer are calculated in the post-processing code RIPTIDE for given observation angles and frequencies. We demonstrate the appearance of trailing components behind the leading moving shock. The latter destabilizes the jet, causing the emergence of oscillating standing shocks and relaxation shocks. Emissions from these regions can dominate the overall flux or lead to flare echos in the light curve. Another observational marker of relaxation shocks appears in time-distance plots of bright VLBI components of the jet. Our scenario provides a plausible explanation for radio VLBI observations of the radio-galaxy 3C 111 where trailing components have been observed during a radio outburst event in 1997.
description: 13 pages, 12 figures
Dielectric properties and stratigraphy of regolith in the lunar South Pole-Aitken basin: Observations from the Lunar Penetrating Radar
Creators: name: Feng, Jianqing
name: Siegler, Matthew. A.
name: White, Mackenzie N.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: We examine data obtained by the Lunar Penetrating Radar (LPR) onboard the Chang'E-4 (CE-4) mission to study the dielectric properties and stratigraphy of lunar regolith on the far side of the Moon. The data collected from January 2019 to September 2020 were processed to generate a 540 m radargram. The travel velocity of the radar signal and the permittivity of the regolith were deduced from hyperbolas in the radargram. As CE-4 LPR detected distinct planar reflectors, we evaluated the dielectric loss from the maximum penetration depth based on the radar equation. The derived dielectric properties are compared with the measurements of Apollo samples and Chang'E-2 microwave radiometer observations. The results suggest that regolith at the landing site has a permittivity of 2.64-3.85 and a loss tangent of 0.0032-0.0044, indicating that the local regolith is composed of a fine-grained, low-loss material that is much more homogeneous than that found at the Chang'E-3 landing site. The total thickness of weathered material is 40 m, with several regolith layers and a buried craternidentified in the reconstructed subsurface structure. These layers clearly record a series of impact events from the adjacent regions. We suggest that the top layer is primarily made up of the ejecta from a large crater 140 km away. In contrast, the material source of other thinner layers comes from nearby smaller craters.
description: 9 pages, 9 figures
Bayesian clustering of multiple zero-inflated outcomes
Creators: name: Franzolini, Beatrice
name: Cremaschi, Andrea
name: Boom, Willem van den
name: De Iorio, Maria
Publisher: name: arXiv
Year: 2022
Subjects: subject: Methodology (stat.ME)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Several applications involving counts present a large proportion of zeros (excess-of-zeros data). A popular model for such data is the Hurdle model, which explicitly models the probability of a zero count, while assuming a sampling distribution on the positive integers. We consider data from multiple count processes. In this context, it is of interest to study the patterns of counts and cluster the subjects accordingly. We introduce a novel Bayesian nonparametric approach to cluster multiple, possibly related, zero-inflated processes. We propose a joint model for zero-inflated counts, specifying a Hurdle model for each process with a shifted Negative Binomial sampling distribution. Conditionally on the model parameters, the different processes are assumed independent, leading to a substantial reduction in the number of parameters as compared to traditional multivariate approaches. The subject-specific probabilities of zero-inflation and the parameters of the sampling distribution are flexibly modelled via an enriched finite mixture with random number of components. This induces a two-level clustering of the subjects based on the zero/non-zero patterns (outer clustering) and on the sampling distribution (inner clustering). Posterior inference is performed through tailored MCMC schemes. We demonstrate the proposed approach on an application involving the use of the messaging service WhatsApp.
National Survey on Energy and Environment: Fall 2009
Creators: name: University Of Michigan Center For Local, State
Publisher: name: Roper Center for Public Opinion Research
Year: 2020

description: Average temperature on earth is increasing (2); earth warming due to human activity/natural patterns in earth's environment (1); global warming serious problem (1); concern about issue of global warming (climate change) (6); agree/disagree with various statements about global warming (climate change) (5); responsibility for taking actions to reduce global warming (3); agree/disagree with various statements about global warming policies (7); affect of religious beliefs on opinion about government dealing with global warming (1); various ways state governments can reduce emissions of green house gases (6); policies to limit emission of greenhouse gases (7); cap and trade proposal (3); carbon fuels tax (3); willing to pay extra money in order for more renewable energy to be produced (1); primary source for national/world news (1); political partisanship (1).
Methods for NSD3(PWWP1) and histone H3 interaction cellular assay
Creators: name: Szewczyk, Magdalena
Publisher: name: Zenodo
Year: 2020
Subjects: NSD3, PWWP1, NanoBRET assay, H3K36 methylation

description: Methods for NSD3(PWWP1) and histone H3 interaction cellular assay posted on openlabnotebooks.org.
$Herschel$ investigation of cores and filamentary structures in the Perseus molecular cloud
Creators: name: Zhang, Chang
name: Zhang, Guo-Yin
name: Li, Jin-Zeng
name: Li, Xue-Mei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Cores and filamentary structures are the prime birthplaces of stars, and play key roles in the process of star formation. Latest advances in the methods of multi-scale source and filament extraction, and in making high-resolution column density map from $Herschel$ multi-wavelength observations enable us to detect the filamentary network structures in highly complex molecular cloud environments. The statistics for physical parameters shows that core mass strongly correlates with core dust temperature, and $M/L$ strongly correlates with $M/T$, which is in line with the prediction of the blackbody radiation, and can be used to trace evolutionary sequence from unbound starless cores to robust prestellar cores. Crest column densities of the filamentary structures are clearly related with mass per unit length ($M_{\rm line}$), but are uncorrelated by three orders ranging from $\sim 10^{20}$ to $\sim 10^{22}$ $ \rm cm^{-2}$ with widths. Full width at half maximum (FWHM) have a median value of 0.15 pc, which is consistent with the 0.1 pc typical inner width of the filamentary structures reported by previous research. We find $\sim $70\% of robust prestellar cores (135/199) embedded in supercritical filaments with $M_{\rm line}>16~M_{\odot}/{\rm pc}$, which implies that the gravitationally bound cores come from fragmentation of supercritical filaments. And on the basis of observational evidences that probability distribution function (PDF) with power-law distribution in the Perseus south is flatter than north, YSO number is significantly less than that in the north, and dust temperature difference. We infer that south region is more gravitationally bound than north region.
description: 15 pages, 9 figures, accepted for publication in RAA
Fully heavy pentaquark states in constituent quark model
Creators: name: An, Hong-Tao
name: Luo, Si-Qiang
name: Liu, Zhan-Wei
name: Liu, Xiang
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The LHCb collaboration reported a fully charmed tetraquark state X(6900) in the invariant mass spectrum of $J/ψ$ pairs in 2020. This discovery inspires us to further study the fully heavy pentaquark system. In this work, we investigate systematically all possible configurations for ground fully heavy pentaquark system via the variational method in the constituent quark model. According to our calculations, we further analyze the relative lengths between quarks and the contributions to the pentaquark masses from different terms of the Hamiltonian. We think no stable states exist in fully heavy pentaquark system. We hope that our study will be helpful to explore for fully heavy pentaquark states.
description: 19 pages
Solving the Initial Value Problem of Ordinary Differential Equations by Lie Group based Neural Network Method
Creators: name: Wen, Ying
name: Chaolu, Temuer
name: Wang, Xiangsheng
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: To combine a feedforward neural network (FNN) and Lie group (symmetry) theory of differential equations (DEs), an alternative artificial NN approach is proposed to solve the initial value problems (IVPs) of ordinary DEs (ODEs). Introducing the Lie group expressions of the solution, the trial solution of ODEs is split into two parts. The first part is a solution of other ODEs with initial values of original IVP. This is easily solved using the Lie group and known symbolic or numerical methods without any network parameters (weights and biases). The second part consists of an FNN with adjustable parameters. This is trained using the error back propagation method by minimizing an error (loss) function and updating the parameters. The method significantly reduces the number of the trainable parameters and can more quickly and accurately learn the real solution, compared to the existing similar methods. The numerical method is applied to several cases, including physical oscillation problems. The results have been graphically represented, and some conclusions have been made.
РАЗРАБОТКА ПОВОРОТНОГО АКТУАТОРА С ИСПОЛЬЗОВАНИЕМ «УМНЫХ» МАТЕРИАЛОВ
Creators: name: Пинегин И. Р.
name: Усов Д. И.
name: Павлова А. Д.
name: Овчинникова В. А.
Publisher: name: Союз машиностроителей России. Национальная научно-техническая конференция
Year: 2020
Subjects: высокоточные электродвигатели
микроэлектродвигатели
магнитострикция
оптические системы
поворотный актуатор
галфенол
магнитомягкие сплавы

description: В работе предложены исследования прутков галфенола 18,4 % Ga, произведенных методом Бриджмана — Стокбаргера. Результаты исследования показали коэффициент магнитострикции от 50 до 55 частей на миллион. На основе данных показаний были составлены графики зависимости максимального проектного удлинения галфенола от напряженности. Были проведены расчеты по разработке прецизионного поворотного актуатора с использованием проектного варианта галфенола с удлинением до 1 %.
Dynamic Structure Estimation from Bandit Feedback using Nonvanishing Exponential Sums
Creators: name: Ohnishi, Motoya
name: Ishikawa, Isao
name: Kuroki, Yuko
name: Ikeda, Masahiro
Publisher: name: arXiv
Year: 2022
Subjects: subject: Discrete Mathematics (cs.DM)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: This work tackles the dynamic structure estimation problems for periodically behaved discrete dynamical system in the Euclidean space. We assume the observations become sequentially available in a form of bandit feedback contaminated by a sub-Gaussian noise. Under such fairly general assumptions on the noise distribution, we carefully identify a set of recoverable information of periodic structures. Our main results are the (computation and sample) efficient algorithms that exploit asymptotic behaviors of exponential sums to effectively average out the noise effect while preventing the information to be estimated from vanishing. In particular, the novel use of the Weyl sum, a variant of exponential sums, allows us to extract spectrum information for linear systems. We provide sample complexity bounds for our algorithms, and we experimentally validate our theoretical claims on simulations of toy examples, including Cellular Automata.
description: 35 pages, 9 figures
ЦИФРОВОЕ ПРИЕМНОЕ УСТРОЙСТВО КОРОТКОВОЛНОВОГО ДИАПАЗОНА НА ОТЕЧЕСТВЕННОЙ ЭЛЕМЕНТНОЙ БАЗЕ
Creators: name: Глинкин И. А.
name: Литвинов С. В.
name: Мудрик Д. С.
Publisher: name: Союз машиностроителей России. Национальная научно-техническая конференция
Year: 2020
Subjects: импортозамещение
приемник
КВ-диапазон
российские компоненты

description: В данных материалах представлен облик приемника прямого преобразования частоты коротковолнового диапазона на российских электронных компонентах, приведено описание и обоснование выбранной структуры построения приемного устройства и его составных частей. При разработке максимально использовались решения, позволяющие обеспечить заданные характеристики аппаратуры при минимизации ее габаритов и стоимости. Также разработка учитывает успешный опыт создания приемной аппаратуры с применением отечественной элементной базы.
Imbalance of Prevalence and Specialty Care for Osteoarthritis for First Nations People in Canada
Creators: name: Barnabe, Cheryl
name: Hemmelgarn, Brenda R.
name: Jones, Catherine Allyson, 1959-
name: Peschken, Christine A.
name: Voaklander, Don
name: Joseph, Lawrence
name: Bernatsky, Sasha, 1967-
name: Esdaile, John
name: Marshall, Deborah A.
Publisher: name: The University of British Columbia
Year: 2020

description: Objective: Estimate the population-based prevalence and healthcare use for osteoarthritis (OA) by First Nations (FN) and non-First Nations (non-FN) in Alberta. Methods: A cohort of adults with OA (≥2 physician claims in 2 years or 1 hospitalization with ICD-9-CM code 715x or ICD-10-CA code M15-19, years 1993-2010) was defined, with FN determination by premium payer status. Prevalence rates (2007/8) were estimated from the cohort and the population registered with the Alberta Health Care Insurance Plan. Rates of outpatient primary care and specialist (orthopedics, rheumatology, internal medicine) visits; arthroplasty (hip and knee); and all-cause hospitalization were estimated. Results: OA prevalence in FN was twice that of the non-FN population (16.1 vs 7.8 cases/100 population; standardized rate ratio (SRR) adjusted for age and sex 2.06, 95%CI 2.00-2.12). The SRR (adjusted for age, sex and location of residence) for primary care visits for OA was nearly double in FN compared to non-FN (SRR 1.88, 95%CI 1.87-1.89), and internal medicine visits were increased (SRR 1.25, 95%CI 1.25-1.26). Visit rates with an orthopedic surgeon (SRR 0.49, 95%CI 0.48-0.50) or rheumatologist (SRR 0.62, 95%CI 0.62-0.63) were substantially lower in FN with OA. Hip and knee arthroplasties were performed less frequently in FN with OA (SRR 0.48, 95%CI 0.47-0.49), but all-cause hospitalization rates were higher (SRR 1.59, 95%CI 1.58-1.60). Conclusion: We estimate a 2-fold higher prevalence of OA in the FN population, with differential healthcare use. Reasons for higher use of primary care and lower use of specialty services and arthroplasty compared to the general population are not yet understood.
ЭЛЕКТРОХРОМНЫЕ НАНОКОМПОЗИТНЫЕ ПЛЕНКИ НА ОСНОВЕ ОКСИДА ГРАФЕНА С УПРАВЛЯЕМЫМИ ОПТИЧЕСКИМИ СВОЙСТВАМИ
Creators: name: Щегольков А. В.
Publisher: name: Союз машиностроителей России. Национальная научно-техническая конференция
Year: 2020
Subjects: электрохромное устройство
оксид графена
триоксид вольфрама

description: В статье представлены результаты исследований оптических свойств нанокомпозитных электрохромных пленок WO3/rGO, полученных техникой спрей пиролиза и остуженных при температуре 300 °C. Установлено влияние различных концентрации GO в составе электрохромной композиции WO3 на изменения оптических свойств пленки. Получены данные изменения оптических свойств нанокомпозитных электрохромных пленок WO3/rGO, содержащих 0; 2,5; 5; 7,5 масс. % GO. Доказано, что с увеличением концентрации GO в составе электрохромной композиции WO3 уменьшается светопропускание.
Bythinella kambosensis Glöer & Hirschfelder, 2020, n. sp.
Creators: name: Glöer, Peter
name: Hirschfelder, Hans-Jürgen
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Bythinellidae
Bythinella
Bythinella kambosensis

description: Bythinella kambosensis n. sp. [fig. 2.4]
 Type locality: Greece, Messenia, western slope of the Taygetos Mountains, spring along the road between Akrogiali and Kambos, about 2.5 km from the turnoff from the coastal road, N 36°56'56.0" / E 22°10'00.8", 222 m a.s.l., 18.04.2018, leg. Hans-Jürgen & Andrea Hirschfelder.
 Type Material: Holotype (ZMH 140682): Shell height 2.95 mm, shell width 1.8 mm. Paratypes from type locality: ZMH (140683/2), coll. Hirschfelder (7 adult, 7 subadult).
 Etymology: The new species is named after Kambos Gorge, into which the source drains.
 Description:
 Shell: The shell is slightly concial ovate with a small apex. The surface is silky. The 4.5-5 whorls are slightly convex with a clear suture. The body whorl takes about 0.75 of shell height. The aperture is ovate, slightly angled at the top, with a sharp peristome. The umbilicus is closed. The shell is 2.7-3.0 mm high and 1.7-1.8 mm broad.
 Differentiating characters: The new species differs from the neighbouring B. taygetensis n. sp. by the stout and more conical shell (length to width ratio of 1.7, which is about 1.8 in B. taygetensis n. sp.) and from most of the Greek species by a charcteristically silky sheen.
 Associated species: Pseudamnicola exilis (Frauenfeld, 1863).
 Distribution: Only known from type locality on the western slope of the Taygetos Mountains.
description: Published as part of Glöer, Peter & Hirschfelder, Hans-Jürgen, 2020, Some new Bythinella spp. from southern Greece (Gastropoda: Bythinellidae), pp. 60-67 in Ecologica Montenegrina 30 on page 64, DOI: 10.37828/em.2020.30.5, http://zenodo.org/record/13231395
Identifying Scenarios in Field Data to Enable Validation of Highly Automated Driving Systems
Creators: name: Reichenbächer, Christian
name: Rasch, Maximilian
name: Kayatas, Zafer
name: Wirthmüller, Florian
name: Hipp, Jochen
name: Dang, Thao
name: Bringmann, Oliver
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Scenario-based approaches for the validation of highly automated driving functions are based on the search for safety-critical characteristics of driving scenarios using software-in-the-loop simulations. This search requires information about the shape and probability of scenarios in real-world traffic. The scope of this work is to develop a method that identifies redefined logical driving scenarios in field data, so that this information can be derived subsequently. More precisely, a suitable approach is developed, implemented and validated using a traffic scenario as an example. The presented methodology is based on qualitative modelling of scenarios, which can be detected in abstracted field data. The abstraction is achieved by using universal elements of an ontology represented by a domain model. Already published approaches for such an abstraction are discussed and concretised with regard to the given application. By examining a first set of test data, it is shown that the developed method is a suitable approach for the identification of further driving scenarios.
description: 9 pages, 5 figures
Low Mass Stars as Tracers of Star and Cluster Formation
Creators: name: Megeath, S. T.
name: Gutermuth, R. A.
name: Kounkel, M. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We review the use of young low mass stars and protostars, or young stellar objects (YSOs), as tracers of star formation. Observations of molecular clouds at visible, infrared, radio and X-ray wavelengths can identify and characterize the YSOs populating these clouds, with the ability to detect deeply embedded objects and all evolutionary stages. Surveys with the Spitzer, Herschel, XMM-Newton and Chandra space telescopes have measured the spatial distribution of YSOs within a number of nearby (< 2.5 kpc) molecular clouds, showing surface densities varying by more than three orders of magnitude. These surveys have been used to measure the spatially varying star formation rates and efficiencies within clouds, and when combined with maps of the molecular gas, have led to the discovery of star-forming relations within clouds. YSO surveys can also characterize the structures, ages, and star formation histories of embedded clusters, and they illuminate the relationship of the clusters to the networks of filaments, hubs and ridges in the molecular clouds from which they form. Measurements of the proper motions and radial velocities of YSOs trace the evolving kinematics of clusters from the deeply embedded phases through gas dispersal, providing insights into the factors that shape the formation of bound clusters. On 100 pc scales that encompass entire star-forming complexes, Gaia is mapping the young associations of stars that have dispersed their natal gas and exist alongside molecular clouds. These surveys reveal the complex structures and motions in associations, and show evidence for supernova driven expansions. Remnants of these associations have now been identified by Gaia, showing that traces of star-forming structures can persist for a few hundred million years.
description: Review article accepted to PASP
СОЗДАНИЕ НА ФГУП «ПО «МАЯК» НОВОГО ПЛАВИТЕЛЯ С ДОННЫМ СЛИВОМ ДЛЯ ОТВЕРЖДЕНИЯ ВАО В БОРОСИЛИКАТНОЕ СТЕКЛО В РАМКАХ НОВОГО КОМПЛЕКСА ОСТЕКЛОВЫВАНИЯ
Creators: name: Шайдуллин С. М.
name: Козлов П. В.
name: Ремизов М. Б.
name: Мелентьев А. Б.
name: Бендасов Д. И.
name: Вербицкий К. В.
name: Чермных А. А.
name: Ребрин М. А.
Publisher: name: Союз машиностроителей России. Национальная научно-техническая конференция
Year: 2020
Subjects: высокоактивные отходы
алюмофосфатное стекло
боросиликатное стекло
эвакуируемый плавитель

description: Описана текущая состояние технологии остекловывания ВАО на радиохимическом производстве ФГУП «ПО «Маяк». Рассмотрены концептуальные и технические решения по развитию технологии остекловывания различных видов жидких ВАО на предприятии. Описаны основные технические отличия перспективного малогабаритного плавителя от установок, эксплуатировавшихся на предприятии ранее. Представлены основные результаты проведенных в 2018—2019 годы испытаний первого опытного образца плавителя и перспективы продолжения работ в данном направлении.
Yet another star in the Albireo system -- The discovery of Albireo Ad
Creators: name: Jack, D.
name: Schröder, K. -P.
name: Mittag, M.
name: Bastian, U.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. Albireo is a well-known bright visual double star. It is still unclear if the components A and B form a gravitationally bound system. The component Albireo A is itself a binary star. The orbital parameters of the Albireo Aa, Ac system have been determined only recently. Thus, Albireo is still of interest for current research. Aims. We aim to present evidence for the detection of a new member in the Albireo system. Furthermore, we aim to determine the orbital parameters and to find further conclusions for the Albireo system. Methods. We used spectroscopic observations of Albireo A obtained with the TIGRE telescope and determined the radial velocities during a period of over three years. We analyzed the radial velocity curve with RadVel to determine the orbital parameters. In addition, we determined the stellar parameters of Albireo Aa with iSpec. Results. We found clear evidence for yet another star in the Albireo system orbiting Albireo Aa with a period of about $P = 371$ days. Several alternative explanations for the periodic radial velocity signal could be discarded. The new companion Albireo Ad is a low mass star of about $0.085~M_\odot$. Conclusions. We conclude that Albireo is a hierarchical multiple star system and remains an interesting object for future observations and studies.
description: 6 pages, 6 figures, accepted for publication in Astronomy & Astrophysics, new version after language editing
ПРИМЕНЕНИЕ ТЕРМООПРАВОК ДЛЯ ОБРАБОТКИ ЗУБЧАТЫХ КОЛЕС ПОВЫШЕННОЙ СТЕПЕНИ ТОЧНОСТИ
Creators: name: Волков М. А.
Publisher: name: Союз машиностроителей России. Национальная научно-техническая конференция
Year: 2020
Subjects: технологическая оправка
термооправка
погрешность базирования
зубообработка
температурная деформация

description: В данной статье анализируется технология изготовления зубчатого венца цилиндрических зубчатых колес 7-й степени точности и ниже на жестких технологических оправках и термооправках. Особое внимание в статье уделено применению термооправок на операции зубофрезерования, принцип работы которой основан на температурной деформации установочной поверхности. Перечислены приборы и материалы, входящие в устройство нагрева термооправки и схему контроля температуры. В статье приведен сравнительный анализ (по их количеству на одну деталь, погрешности базирования, погрешности установки и температурному режиму) жестких технологических оправок и термооправок. Перечислена последовательность основных необходимых действий по обработке зубчатых колес с применением термооправки на зубофрезерном станке. В заключении автором перечислены основные выводы и результаты по технологии применения термооправок для обработки зубчатых колес повышенной степени точности.
МНОГОТЕМБРОВЫЙ МЕХАНИЧЕСКИЙ МУЗЫКАЛЬНЫЙ ИНСТРУМЕНТ С ГОРИЗОНТАЛЬНОЙ КНОПОЧНОЙ КЛАВИАТУРОЙ
Creators: name: Амелюшкин И. А.
name: Чесноков В. И.
Publisher: name: Союз машиностроителей России. Национальная научно-техническая конференция
Year: 2020
Subjects: механическая система
управление давлением воздуха
меха
педали
клавиатура

description: Разработана концепция нового музыкального инструмента, которая обладает значительными преимуществами в сравнении с аналогами, прототипами и традиционными инструментами. С помощью предложенных в работе диаграмм сравнительного анализа музыкальных инструментов наглядно показаны преимущества оригинальных решений. Созданы опытные модели многотембрового музыкального инструмента, описаны модификации его конструкции. Приведен обзор существующих аналогов и описание преимуществ нового инструмента по сравнению с известными аналогами, прототипами и традиционными инструментами.
Power laws prevail in medical ultrasound
Creators: name: Parker, Kevin J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Medical Physics (physics.med-ph)
subject: Biological Physics (physics.bio-ph)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Major topics in medical ultrasound rest on the physics of wave propagation through tissue. These include fundamental treatments of backscatter, speed of sound, attenuation, and speckle formation. Each topic has developed its own rich history, lexicography, and particular treatments. However, there is ample evidence to suggest that power law relations are operating at a fundamental level in all the basic phenomena related to medical ultrasound. This review paper develops, from literature over the past 60 years, the accumulating theoretical basis and experimental evidence that point to power law behaviors underlying the most important tissue-wave interactions in ultrasound and in shear waves which are now employed in elastography. The common framework of power laws can be useful as a coherent overview of topics, and as a means for improved tissue characterization.
description: 25 pages, 6 figures
ИНДУСТРИЯ 4.0 ПРИ ПРОВЕДЕНИИ ТЕХНИЧЕСКОГО ОБСЛУЖИВАНИЯ МНОГОЦЕЛЕВЫХ СТАНКОВ
Creators: name: Ковалев А. В.
Publisher: name: Союз машиностроителей России. Национальная научно-техническая конференция
Year: 2020
Subjects: техническое обслуживание
износ
индустрия 4.0
прогнозирование
тренд
диагностика
цифровая среда

description: В данной работе рассмотрены комплексные решения, позволяющие повысить производительность металлообрабатывающего оборудования за счет эффективного технического обслуживания на основе анализа динамических процессов, связанных с эксплуатацией оборудования. Сбор, хранение и анализ данных осуществляется в среде Индустрия 4.0 с помощью облачных ресурсов и встроенных средств диагностики. Автоматизация работы ремонтных служб позволяет оптимизировать сроки между плановыми обслуживаниями, снизить количество аварийных остановов, улучшить качество обслуживания и степень надежности оборудования с сохранением его технологических параметров.
Magnetotransport due to conductivity fluctuations in non-magnetic ZrTe2 nanoplates
Creators: name: Wang, Jie
name: Wang, Yihao
name: Wu, Min
name: Li, Junbo
name: Miao, Shaopeng
name: Hou, Qingyi
name: Li, Yun
name: Zhou, Jianhui
name: Zhu, Xiangde
name: Xiong, Yimin
name: Ning, Wei
name: Tian, Mingliang
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Transition metal dichalcogenides with nontrivial band structures exhibit various fascinating physical properties and have sparked intensively research interest. Here, we performed systematic magnetotransport measurements on mechanical exfoliation prepared ZrTe2 nanoplates. We revealed that the negative longitudinal magnetoresistivity observed at high field region in the presence of parallel electric and magnetic fields could stem from the conductivity fluctuations due to the excess Zr in the nanoplates. In addition, the parametric plot, the planar Hall resistivity as function of the in-plane anisotropic magnetoresistivity, has an ellipse-shaped pattern with shifted orbital center, which further strengthen the evidence for the conductivity fluctuations. Our work provides some useful insights into transport phenomena in topological materials.
description: 23 pages, 5 figures
Profit-Maximizing A/B Tests
Creators: name: McDonnell Feit, Elea
name: Berman, Ron
Publisher: name: Zenodo
Year: 2019

description: Marketers often use A/B testing as a tactical tool to compare marketing treatments in a test stage and then deploy the better-performing treatment to the remainder of the consumer population. While these tests have traditionally been analyzed using hypothesis testing, we re-frame such tactical tests as a Bayesian decision problem with an explicit trade-off between the opportunity cost of the test (where some customers receive a sub-optimal treatment) and the potential losses associated with deploying a sub-optimal treatment to the remainder of the population. We derive a closed-form expression for the profit-maximizing test size and show that it is substantially smaller than that typically recommended for a hypothesis test, particularly when the response is noisy or when the total population is small. The common practice of using small holdout groups for media testing can be rationalized by asymmetric priors. The proposed test design achieves nearly the same expected regret as the flexible, yet harder-to-implement multi-armed bandit. Adopting a Bayesian approach to experimental design requires informative priors. We show how priors can be estimated from data on past A/B test, using Stan to fit a hierarchical meta model. An R notebook will be provided which shows the complete process from meta-analysis of past experiments to determining the profit-maximizing sample size for the new A/B test. A full paper is available at https://arxiv.org/abs/1811.00457.
Bardeen-Kiselev black hole with cosmological constant
Creators: name: Rodrigues, Manuel E.
name: Silva, Marcos V. de S.
name: Vieira, Henrique A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work we analyze a solution that mimics the Bardeen solution with a cosmological constant surrounded by quintessence. We show that this solution can be obtained by Einstein equations coupled with nonlinear electrodynamics. We also show that the solution is not always regular and what the conditions for regularity are. We analyze the thermodynamics associated with this type of solution by establishing the form of the Smarr formula and the first law of thermodynamics. We obtain some thermodynamic quantities such as pressure, temperature, heat capacity and isothermal compressibility. Once we have these thermodynamic quantities, we check if this solution has phase transitions and how it behaves at the points where the transitions occur. For some values of the parameters, we find that the solution exhibits a first-order phase transition, like a van der Waals fluid.
description: 17 pages, 9 figures. Published version
Vision-State Fusion: Improving Deep Neural Networks for Autonomous Robotics
Creators: name: Cereda, Elia
name: Bonato, Stefano
name: Nava, Mirko
name: Giusti, Alessandro
name: Palossi, Daniele
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Vision-based deep learning perception fulfills a paramount role in robotics, facilitating solutions to many challenging scenarios, such as acrobatic maneuvers of autonomous unmanned aerial vehicles (UAVs) and robot-assisted high-precision surgery. Control-oriented end-to-end perception approaches, which directly output control variables for the robot, commonly take advantage of the robot's state estimation as an auxiliary input. When intermediate outputs are estimated and fed to a lower-level controller, i.e. mediated approaches, the robot's state is commonly used as an input only for egocentric tasks, which estimate physical properties of the robot itself. In this work, we propose to apply a similar approach for the first time -- to the best of our knowledge -- to non-egocentric mediated tasks, where the estimated outputs refer to an external subject. We prove how our general methodology improves the regression performance of deep convolutional neural networks (CNNs) on a broad class of non-egocentric 3D pose estimation problems, with minimal computational cost. By analyzing three highly-different use cases, spanning from grasping with a robotic arm to following a human subject with a pocket-sized UAV, our results consistently improve the R\textsuperscript{2} regression metric, up to +0.51, compared to their stateless baselines. Finally, we validate the in-field performance of a closed-loop autonomous cm-scale UAV on the human pose estimation task. Our results show a significant reduction, i.e., 24\% on average, on the mean absolute error of our stateful CNN, compared to a State-of-the-Art stateless counterpart.
description: This paper has been accepted for publication in the Journal of Intelligent & Robotic Systems. \copyright 2024 Springer
Signature of Supersonic Turbulence in Galaxy Clusters Revealed by AGN-driven H$α$ Filaments
Creators: name: Hu, Haojie
name: Qiu, Yu
name: Gendron-Marsolais, Marie-Lou
name: Bogdanovic, Tamara
name: Hlavacek-Larrondo, Julie
name: Ho, Luis C.
name: Inayoshi, Kohei
name: McNamara, Brian R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The hot intracluster medium (ICM) is thought to be quiescent with low observed velocity dispersions. Surface brightness fluctuations of the ICM also suggest that its turbulence is subsonic with a Kolmogorov scaling relation, indicating that the viscosity is suppressed and the kinetic energy cascades to small scales unscathed. However, recent observations of the cold gas filaments in galaxy clusters find that the scaling relations are steeper than that of the hot plasma, signaling kinetic energy losses and the presence of supersonic flows. In this work we use high-resolution simulations to explore the turbulent velocity structure of the cold filaments at the cores of galaxy clusters. Our results indicate that supersonic turbulent structures can be "frozen" in the cold gas that cools and fragments out of a fast, $10^7$ K outflow driven by the central active galactic nucleus (AGN), when the radiative cooling time is shorter than the dynamical sound-crossing time. After the cold gas formation, however, the slope of the velocity structure function (VSF) flattens significantly over short, 10 Myr timescales. The lack of flattened VSF in observations of H$α$ filaments indicates that the H$α$-emitting phase is short-lived for the cold gas in galaxy clusters. On the other hand, the ubiquity of supersonic turbulence revealed by observed filaments strongly suggests that supersonic outflows are an integral part of AGN-ICM interaction, and that AGN activity plays a crucial role at driving turbulence in galaxy clusters.
description: 9 pages, 4 figures, accepted for publication in ApJL
Construct validity and impact of mode of administration of the PedsQL™ among a pediatric injury population
Creators: name: Kruse, Sami
name: Schneeberg, Amy
name: Brussoni, Mariana
Publisher: name: BioMed Central
Year: 2021

description: The purpose of this study was to determine the construct validity of the PedsQL™ health related quality of life (HRQoL) instrument for use among injured children and to examine the impact of using different modes of administration, including paper and pencil, online and telephone. Results: rANOVA showed significant differences in PedsQL™ total score between baseline and one month post injury (p < .001), and differences in mean total score at one month post injury by category of injury severity (p < .001). There was also significant interaction by category of injury severity for the change in PedsQL™ total score from baseline to one month (p < .001). Pearson’s correlations were highly significant across three modalities of survey administration: paper and pencil, computer and telephone administration (range: .92 to .97, p < .001). Bland-Altman plots showed strong consistency. Conclusion: The PedsQL™ instrument is able to discriminate between pre and post injury HRQoL, as well as HRQoL post injury for injuries of varying severity. These findings are an indication that this instrument has good construct validity for the purpose of evaluating HRQoL of injured children. Data collected via paper-pencil, online and telephone administration were highly consistent. This is important as depending on the setting, clinical or research, different modalities of completing this instrument may be more appropriate.
Ionization of HeII in star-forming galaxies by X-rays from cluster winds and superbubbles
Creators: name: Oskinova, Lidia
name: Schaerer, Daniel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The nature of the sources powering nebular HeII emission in star-forming galaxies remains debated, and various types of objects have been considered, including Wolf-Rayet stars, X-ray binaries, and Population III stars. Modern X-ray observations show the ubiquitous presence of hot gas filling star-forming galaxies. We use a collisional ionization plasma code to compute the specific HeII ionizing flux produced by hot gas and show that if its temperature is not too high (less than 2.5 MK), then the observed levels of soft diffuse X-ray radiation could explain HeII ionization in galaxies. To gain a physical understanding of this result, we propose a model that combines the hydrodynamics of cluster winds and hot superbubbles with observed populations of young massive clusters in galaxies. We find that in low-metallicity galaxies, the temperature of hot gas is lower and the production rate of HeII ionizing photons is higher compared to high-metallicity galaxies. The reason is that the slower stellar winds of massive stars in lower-metallicity galaxies input less mechanical energy in the ambient medium. Furthermore, we show that ensembles of star clusters up to 10-20 Myr old in galaxies can produce enough soft X-rays to induce nebular HeII emission. We discuss observations of the template low-metallicity galaxy I Zw 18 and suggest that the HeII nebula in this galaxy is powered by a hot superbubble. Finally, appreciating the complex nature of stellar feedback, we suggest that soft X-rays from hot superbubbles are among the dominant sources of HeII ionizing flux in low-metallicity star-forming galaxies.
description: 6 pages, 3 figures, accepted by A&A
The Waiting-Time Distribution for Network Partitions in Cascading Failures in Power Networks
Creators: name: Huo, Long
name: Chen, Xin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Systems and Control (eess.SY)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Network redundancy is one of the spatial network structural properties critical to robustness against cascading failures in power networks. The waiting-time distributions for network partitions in cascading failures explain how the spatial network structures affect the cascading behaviors. Two waiting time events associated with the first and largest network partitions are studied for cascading failures under different network redundancies. With the synthetic power networks, the waiting-time distributions of network partitions can be systematically analyzed for various network redundancies. Waiting-time distributions shift to the right accordingly when network redundancies increase. Meanwhile, the sizes of the largest partitions decrease while the numbers of them increase statistically. The realistic power networks of France, Texas, and Poland also show the same trend for waiting-time distributions.
Bythinella alexpeteri Glöer & Hirschfelder, 2020, n. sp.
Creators: name: Glöer, Peter
name: Hirschfelder, Hans-Jürgen
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Bythinellidae
Bythinella
Bythinella alexpeteri

description: Bythinella alexpeteri n. sp. [fig. 2.5]
 Type locality: Greece, Arcadia, Mari, travertine spring at the northern end of the village, N 37°01'58.7" / E 22°49'33.5", 634 m a.s.l., 10.04.2018, leg. Hans-Jürgen Hirschfelder.
 Type Material: Holotype (ZMH 140684): Shell height 2.9 mm, shell width 1.8 mm. Paratypes from type locality: ZMH (140685/5), coll. Hirschfelder (17 adult, 13 subadult).
 Etymology: The new species is named after Alexander and Peter Reischütz, who figured this species in 2008 for the first time without formal description and compared it with the syntopic Bythinella beckmanni.
 Description:
 Shell: The shell is ovate cylindrical with a small apex. The 4.5-5 whorls are slightly convex with a deep suture. The body whorl takes about 0.75 of shell height. The aperture is ovate, angled at the top with a sharp peristome, somewhat thickened at the columella. The umbilicus is closed. The shell is 2.6-2.9 mm high and 1.7-1.8 mm broad.
 Differentiating characters: The syntopic Bythinella beckmanni Reischütz et al., 2008, is much smaller (2 mm) and more slender with a less deep suture. B. kwanti is very similar, but the umbilicus is slit-like. The latter species occurs at a distance of 120 km in the Aroania Oros and therefore it seems unlikely that both species are conspecific.
 Associated species: Bythinella beckmanni.
 Distribution: Only known from type locality in Mari at the southern slope of the Parnon Mountains.
 Remarks: The sympatrically occurring Bythinella beckmanni [fig. 3.5] was not found again in 2018. That species might be extinct as already suspected by Reischütz et al. (2008).
description: Published as part of Glöer, Peter & Hirschfelder, Hans-Jürgen, 2020, Some new Bythinella spp. from southern Greece (Gastropoda: Bythinellidae), pp. 60-67 in Ecologica Montenegrina 30 on page 64, DOI: 10.37828/em.2020.30.5, http://zenodo.org/record/13231395
Quantifying the Dzyaloshinskii-Moriya Interaction Induced by the Bulk Magnetic Asymmetry
Creators: name: Zhang, Qihan
name: Liang, Jinghua
name: Bi, Kaiqi
name: Zhao, Le
name: Bai, He
name: Cui, Qirui
name: Zhou, Heng-An
name: Bai, Hao
name: Feng, Hongmei
name: Song, Wenjie
name: Chai, Guozhi
name: Gladii, O.
name: Schultheiss, H.
name: Zhu, Tao
name: Zhang, Junwei
name: Peng, Yong
name: Yang, Hongxin
name: Jiang, Wanjun
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A broken interfacial inversion symmetry in ultrathin ferromagnet/heavy metal (FM/HM) bilayers is generally believed to be a prerequisite for accommodating the Dzyaloshinskii-Moriya interaction (DMI) and for stabilizing chiral spin textures. In these bilayers, the strength of the DMI decays as the thickness of the FM layer increases and vanishes around a few nanometers. In the present study, through synthesizing relatively thick films of compositions CoPt or FePt, CoCu or FeCu, FeGd and FeNi, contributions to DMI from the composition gradient induced bulk magnetic asymmetry (BMA) and spin-orbit coupling (SOC) are systematically examined. Using Brillouin light scattering spectroscopy, both the sign and amplitude of DMI in films with controllable direction and strength of BMA, in the presence and absence of SOC are experimentally studied. In particular, we show that a sizable amplitude of DMI (0.15 mJ/m^2) can be realized in CoPt or FePt films with BMA and strong SOC, whereas negligible DMI strengths are observed in other thick films with BMA but without significant SOC. The pivotal roles of BMA and SOC are further examined based on the three-site Fert-Levy model and first-principles calculations. It is expected that our findings may help to further understand the origin of chiral magnetism and to design novel non-collinear spin textures.
description: Physical Review Letters, in press