Calculation of parameters of elementary nanocrystals of liquid metals at melting temperature

Method of calculation and calculated values of parameters of elementary nanocrystals of liquid metals at melting temperature are given. It has been shown that radii of elementary nanocrystals are from 2 nm to 12 nm, and the number of atoms in each elementary nanocrystal varies from 2000 to 100000. This provides liquid metals with a high solidification rate and explains the abnormally high diffusion coefficient in liquid metals compared to solid metals.

Estimation of truck reduction factors applicable to calculation of parameters of a regulated intersection

Introduction. The rapid growth of the country’s car park and the increasing rate of traffic volume lead to various types of transport problems. This is especially acute in regulated areas located near logistics parks, as well as in industrial zones of cities. Here, in the general traffic flow, trucks prevail, which differ from passenger cars primarily in their overall dimensions and dynamic characteristics. For the uniformity of the traffic flow, a certain difference is compensated by specialized coefficients of converting to a conventional passenger car. The performed research is aimed at establishing the main methods used in bringing freight vehicles to a conventional passenger car and assessing the current coefficients of converting freight vehicles to a conventional passenger car by determining the value of the reduced traffic intensity.Methods and materials. Within the framework of the study performed, natural methods of data collection were used for the subsequent calculation. When analyzing certain parameters, mathematical models have been established that underlie certain values of the coefficients of converting trucks to a conventional passenger car.Results. In the course of the study, the authors classified the methods for determining the coefficients of bringing a truck to a conventional passenger car. The values of the reduction factors for some of them have been established, which can be used when calculating the parameters of the regulated section. The present value of road traffic on the set object of the study - the regulated intersection - has been calculated using different actuation coefficients established earlier. The results obtained are assessed.Conclusion. The analysis of the values obtained as a result of calculations showed their significant difference from each other with a difference of 12%, 53% and 300% of the value of the total (not reduced) intensity. Based on the results obtained, the main tasks of further research are determined.

Determination of technological heredity when machining holes in parts of gas turbine engines

Calculation of parameters that determine technological heredity during drilling and the ability to control the process of technological heredity. Keywords: drilling, cutting force, drift, hole axis, depth and degree of hardening, technological heredity. [email protected]

SiamMFC: Visual Object Tracking Based on Mainfold Full Convolution Siamese Network

Visual tracking task is divided into classification and regression tasks, and manifold features are introduced to improve the performance of the tracker. Although the previous anchor-based tracker has achieved superior tracking performance, the anchor-based tracker not only needs to set parameters manually but also ignores the influence of the geometric characteristics of the object on the tracker performance. In this paper, we propose a novel Siamese network framework with ResNet50 as the backbone, which is an anchor-free tracker based on manifold features. The network design is simple and easy to understand, which not only considers the influence of geometric features on the target tracking performance but also reduces the calculation of parameters and improves the target tracking performance. In the experiment, we compared our tracker with the most advanced public benchmarks and obtained a state-of-the-art performance.

Исследование возможностей оценки состояния структуры металла трубопроводов, находившихся в эксплуатации, ультразвуковым методом

Results of the first stage of ultrasonic researches of structure of metal of pipelines of the thermal power stations which are taking place in operation are submitted. Metal of marks of steel was exposed to tests: 15Х1М1ФИ and the St. 20 with a various operating time (time of operation). Samples of metal were exposed metallographic to the analysis, on the basis of given which (medium-sized grains , dispersions of distribution lnD — σD) theoretical calculation of parameters OUSE of pulses of a bottom signal in metal is carried out. The quantitative data on influence of thickness of a layer of a contact liquid between the probe and object of the control on working frequencies 5,0, 7,5 and 10 MHz for various medium-sized values of a grain of metal are received. Examples of settlement and experimental pulses and spectra of signals for frequency 5 MHz are given.

CALCULATION OF PARAMETERS OF THE LORAWAN WIRELESS DATA ACQUISITION SYSTEM

The article presents a method for calculating the parameters of the LoRaWAN wireless data acquisition system. The applicability of this technique is shown by the example of deploying a wireless data acquisition system.

DESIGN AND DEVELOPMENT OF THE SOFTWARE COMPLEX FOR AUTOMATIC SELECTION OF PUMPING STATIONS OF WATER SUPPLY AND FORMATION OF TECHNICAL AND COMMERCIAL PROPOSALS

Работа посвящена вопросам проектирования и разработки программного комплекса для автоматического расчета параметров и дальнейшего подбора станций водоснабжения. На основе проведенных расчетов программный комплекс позволяет формировать технико-коммерческое предложение на поставляемое оборудование. Особое внимание уделено подбору параметров насосной станции согласно данным о напоре и расходе в рабочей точке. Это является важной задачей в условиях отсутствия полноты данных, предоставляемых производителями оборудования. The work is devoted to the design and development of a software package for automatic calculation of parameters and further selection of water supply stations. Based on the calculations performed, the software package allows you to form a technical and commercial proposal for the equipment supplied. Particular attention is paid to the selection of the parameters of the pumping station according to the data on the head and flow rate at the operating point. This is an important task in the absence of completeness of data provided by equipment manufacturers.

Use of electromechanical analogies in the construction and calculation of a simulation model of the process of torsional oscillations of the shaft line of an internal combustion engine

The purpose of the article is to substantiate the possibility of using electromechanical analogies in the construction and calculation of parameters of the simulation model of the process of torsional oscillations of the internal combustion engine shaft, which will allow to move from mechanical models of shafts to their electrical counterparts. Results of the research. The article clarifies the relationship between phenomena occurring in mechanical and electrical systems, mechanical and electrical analogues are established, namely force is considered as electromotive force or voltage, velocity as current, moment of inertia as inductance, spring flexibility as capacitance, coefficient friction as electrical resistance, and the kinematic scheme of the shaft line is presented in the form of a diagram of a reactive bipolar, the parameters of which are determined during analytical calculations of the kinematic scheme of the elastic system. The concept of dynamic stiffness is introduced, which is similar to the concept of reactive resistance of a bipolar. The initial data for the calculation of a linear system in which it is assumed that the pliability of the shock absorber is zero. Conclusions. According to the results of the analogies, the parameters of the simulation model were obtained. The calculation of the elastic system using the method of electromechanical analogies allowed to build a simulation model of the shaft line of an internal combustion engine.