Щодо впливу напруженого стану на деформування конструкційних матеріалів

The question of the influence of the type of stress state (TSS) on the process of scleronomic and rheonomic deformation of structural materials under simple and close to simple loading conditions is considered. The parameters characterizing the TSS are indicated. This is a parameter (indicator) of the rigidity of the stress state, which reflects the influence of the first invariant of the stress tensor and is, with an accuracy of a constant factor, the ratio of the hydrostatic component of the stress tensor to its deviator component. The influence of the third invariant of stress tensors is taken into account by a number of parameters – the Nadai-Lode parameter, as well as the TSS angle in its various interpretations. A variant of taking this influence into account by introducing the governing equation of state of the function with the parameter of the TSS angle is shown. This function is determined based on analysis of basic tensile and torsion experiments. It is shown that taking into account VNS increases the accuracy of the calculation and improves the agreement between the calculation results and experiment. Pages of the article in the issue: 66 - 69 Language of the article: UkrainianРозглядається питання впливу виду напруженого стану (ВНС) на процес склерономного і реономного деформування конструкційних матеріалів при простих і близьких до простих режимах навантаження. Вказуються параметри, що характеризують ВНС. Це параметр (показник) жорсткості напруженого стану, що відбиває вплив першого інваріанта тензора напружень і являє собою з точністю до постійного множника відношення гідростатичного компонента тензора напружень до його девіаторної складової. Вплив третього інваріанта тензорів напружень враховується рядом параметрів – параметром Надаи-Лоде, а також кутом ВНС у його різних трактуваннях. Показано варіант врахування цього впливу шляхом введення в визначальні рівняння функції з параметром кута ВНС. Ця функція визначається на основі аналізу базових експериментів на розтяг і кручення. Показано, що врахування ВНС підвищує точність розрахунку і поліпшує узгодження результатів розрахунку з експериментом

On the nature of the solar-wind-Mars interaction

Plasma measurements near Mars on the U.S.S.R. Mars-2, -3, and -5 spacecraft are considered. The data are compared with simultaneous magnetic measurements. Strong evidence is obtained in favor of a direct interaction and mass exchange between the solar wind plasma and the gaseous envelope of Mars

High-frequency oscillations in low-dimensional conductors and semiconductor superlattices induced by current in stack direction

A narrow energy band of the electronic spectrum in some direction in low-dimensional crystals may lead to a negative differential conductance and N-shaped I-V curve that results in an instability of the uniform stationary state. A well-known stable solution for such a system is a state with electric field domain. We have found a uniform stable solution in the region of negative differential conductance. This solution describes uniform high-frequency voltage oscillations. Frequency of the oscillation is determined by antenna properties of the system. The results are applicable also to semiconductor superlattices.Comment: 8 pages, 3 figure

Spatio-temporal data processing of automated geodynamic monitoring system

System In this paper, an approach to the organization of spatial-temporal processing of geoelectrical data in the system of automated geodynamic control is considered. It allows combining methodical, algorithmic, program and information support of the processes of collecting and processing of geodynamic information at subjects to contro

Pseudorandom number generator influence on the genetic algorithm performance to minimize maritime cargo delivery route length

We consider a problem of minimizing the maritime cargo delivery route length to reduce the delivery cost. In our model, the cost is equivalent to the sum of tour lengths of feeders used for the delivery to cover the route. Formulated as a multiple traveling salesman problem, we solve it with a genetic algorithm. The algorithm performance is dramatically influenced by the stream of pseudorandom numbers used for randomly generating the starting population and accomplishing random mutations. As the number of ports increases from 10 to 80, the route length variation intensifies from 3.5% to 22.5% on average. However, we increase the route length minimization accuracy by re-running the algorithm to solve the same problem until closely the best solution is obtained. The number of reruns is about 3 to 6 for up to 20 ports. For more than 20 ports the required number of algorithm reruns abruptly increases from 28 reruns for 30 ports to about 51 reruns within the range of 40 to 80 ports

The monitoring of the irregular disturbances in the arctic on the basis of the processing data of the distributed network of the geophysical observatories

The article discusses a data processing method for geomagnetic field of the earth on a distributed network of geophysical observatories. The proposed method allows to detect and monitor irregular disturbances of the geomagnetic field, evaluate their options, determine the epicenter of the occurrence of disturbances and to estimate the parameters of the epicente

Geodynamic monitoring of development of a karst on the basis of georadar sounding

The questions of practical application of georadar sounding for the detailed studying of development of a karst were considered in the article. The importance of the problem being solved for the planning of construction and further operation of industrial facilities in karst limestone areas is emphasized. In the last case, the geodynamic control of karst zones is necessary, as operation of objects in these zones is economi

Providence Independent, V. 8, Thursday, December 14, 1882, [Whole Number: 392]

[4] p. “Persistent in the Right – Fearless in Opposing Wrong.” Newspaper published in Trappe, Pa. Weekly. Contains local, national and international news, fiction and advertisements.https://digitalcommons.ursinus.edu/providence/1172/thumbnail.jp