6,656 research outputs found
Сравнительный анализ методов моделирования для эргономического проектирования приборов, систем и оборудования
Розглядаються сучасні методи моделювання для ергономічного проектування приладів, систем та обладнання. Представлені результати порівняльного аналізу та рекомендації до застосування ефективних методів моделювання.The modern methods of design for the ergonomics planning of devices, systems and equipment are examined. The results of comparative analysis and recommendation for application of effective methods of design are brought over.Рассматриваются современные методы моделирования для эргономического проектирования приборов, систем и оборудования. Приводятся результаты сравнительного анализа и рекомендации применения эффективных методов моделирования
All solvable extensions of a class of nilpotent Lie algebras of dimension n and degree of nilpotency n-1
We construct all solvable Lie algebras with a specific n-dimensional
nilradical n_(n,2) (of degree of nilpotency (n-1) and with an (n-2)-dimensional
maximal Abelian ideal). We find that for given n such a solvable algebra is
unique up to isomorphisms. Using the method of moving frames we construct a
basis for the Casimir invariants of the nilradical n_(n,2). We also construct a
basis for the generalized Casimir invariants of its solvable extension s_(n+1)
consisting entirely of rational functions of the chosen invariants of the
nilradical.Comment: 19 pages; added references, changes mainly in introduction and
conclusions, typos corrected; submitted to J. Phys. A, version to be
publishe
Принципы и методы создания образно-знаковых моделей для построения информационных моделей систем “человек-машина”
При розв’язанні задач розробки форми умовно-графічних позначень та образно-знакових
моделей застосовувались методи умовного моделювання, алгоритмізації, формалізації, системного аналізу, зворотного синтезу, принципу аналогії та загального антропоцентричного підходу.At the decision of problems(tasks) of devel-
opment of the form of conditional – graphic
designations and figurative – sign models methods of conditional modeling, algorithmization, formalization, the system analysis, return synthesis, a principle of analogy and the general ergonomic approach were applied.При решении задач разработки формы условно-графических обозначений и образно-знаковых моделей применялись методы условного моделирования, алгоритмизации, формализации, системного анализа, обратного синтеза, принципа аналогии и общего антропоцентрического подхода
Application of a complex assessment of landslide hazards in mountain regions
The main regional factors of occurrence and activation of landslides within the mountain region were examined. As a result of study of recommendations made by experts, geologists, and gap analysis of existing methods of forecasting the landslide process, an algorithm of comprehensive assessment of landslide hazard areas based on the construction of models in a GIS environment was proposed. These models describe the spatial patterns of landslides. All factors determining the tendency of the studies area to the landslide process development were divided into actual factors, reflecting the regional peculiarities of the territory and forming the landslide-prone slopes (static model), as well as triggering factors, initiating the landslide process and determining its activity (dynamic model). The first cartographic model was built, showing the distribution of the deterministic indirect indicator of landslide hazard, i.e. stability index
The atomic structure of large-angle grain boundaries and in and their transport properties
We present the results of a computer simulation of the atomic structures of
large-angle symmetrical tilt grain boundaries (GBs) (misorientation
angles \q{36.87}{^{\circ}} and \q{53.13}{^{\circ}}),
(misorientation angles \q{22.62}{^{\circ}} and \q{67.38}{^{\circ}}). The
critical strain level criterion (phenomenological criterion)
of Chisholm and Pennycook is applied to the computer simulation data to
estimate the thickness of the nonsuperconducting layer enveloping
the grain boundaries. The is estimated also by a bond-valence-sum
analysis. We propose that the phenomenological criterion is caused by the
change of the bond lengths and valence of atoms in the GB structure on the
atomic level. The macro- and micro- approaches become consistent if the
is greater than in earlier papers. It is predicted that the
symmetrical tilt GB \theta = \q{53.13}{^{\circ}} should demonstrate
a largest critical current across the boundary.Comment: 10 pages, 2 figure
Impact of Activity Monitoring on Physical Activity, Sedentary Behavior, and Body Weight during the COVID-19 Pandemic
Decreases in individuals\u27 physical activity and increases in sedentary behavior and bodyweight have been reported during the COVID-19 pandemic. The present study assessed the ability of physical activity monitoring, which may promote physical activity and discourage sedentary behavior, to mitigate these negative outcomes. An evaluation of university samples ( N = 404, 40.5 ± 15.4 years) of self-reported physical activity, sedentary behavior, and bodyweight prior to the closure of campus due to the pandemic in March of 2020 and again at the time of the survey administration (May-June 2020) during pandemic-related restrictions was performed. Participants also reported whether they did ( n = 172) or did not ( n = 232) regularly use physical activity monitoring technology. While physical activity was unchanged during the pandemic ( p ≥ 0.15), participants significantly increased sitting by 67.8 ± 156.6 min/day and gained 0.64 ± 3.5 kg from pre-campus to post-campus closure ( p \u3c 0.001). However, the use of activity monitoring did not moderate these changes. In conclusion, while physical activity was not affected, participants reported significant increases in sedentary behavior and bodyweight during the COVID-19 pandemic. These changes occurred regardless of whether participants regularly used physical activity monitoring or not
Simplified mathematical modeling of the distribution process of licuroside and glycyram between the extractant and Glycyrrhizae radices
Theoretical development of the extraction process is an important task for further modeling and calculation of optimal conditions for extraction of biologically active compounds from the plant raw material. The aim of the study was to propose and test a theoretical model to describe the process of Licuroside and Glycyram distribution between the solid phase of Glycyrrhiza radices and the extractant. For studies, we used Glycyrrhiza radices (Liquorice roots). For extraction, we used plant raw material with particle size of 0.1-0.5 mm, and ethanol-water solution 70 % v/v was used as an extractan
Development of the technology for obtaining a thick extract from fruits of milk thistle with the stage of ultrasonic influence
This article presents the results of the development of technology for obtaining a thick extract of milk thistle fruits using ultrasonic treatment of plant material and extractant in the soaking stage. Materials and Methods: For the research, crushed fruits of milk thistle from “Biokor” Ltd, Penza, Russia, series 011216 were used, and the shelf life is 2 year
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