Запропоновано рекомендації щодо моделювання гідродинамічних потоків в озерних екосистемах з урахуванням відновлювальних процесів.
The recommendation for the modelling of hydrodynamic streams in lacustrine ecological systems taking into account restoration processes are offered.
Розглянуто принцип роботи і блок-схему селектора сейсмічних подій для авто- матичних пристроїв сейсмологічних станцій. Обґрунтовано вибір середовища для моделювання. Наведені результати імітаційного візуального моделювання.
The article deals with the work principles and the block scheme of the seismic actions selector for automated devices of seismological stations. The sphere modeling selection has been substantiated. The results of visual imitation modeling has been presented.
Здійснено огляд емпіричних та теоретичних результатів досліджень складних мереж. Наведено основні характеристики, на основі яких вивчаються топологія та еволюція в часі мереж, що виникли в результаті життєдіяльності людини. Зосереджено увагу на динамічних властивостях Інтернету та на аналізі поведінки в часі його основних характеристик. Досліджено топологію локальної комп’ютерної мережі BW- Star & Fox Net у місті Чернівці.
This work is dedicated to the investigation of errors in the recurrent logarithmic analog-to-digital converters (LADC). A generalized structural diagram of the recurrent LADC with a variable logarithmic base is provided. The implementation features and operating principles are explained. Models of the recurrent LADCs that account for the influence of component leakage currents in the converter circuits have been developed. The models consider changes in the structure of the recurrent LADCs during the conversion process.
Analysis of the controlled object, as well as methods and models applied for controlling the heat supply process in a city and urban districts has been carried out. Simulation models of the controlled object functioning in the presence of alternative energy flows with different costs have been developed. The criteria and objective function for optimizing the city’s heat supply process have been synthesized and substantiated.
The paper focuses on the investigation and the simulation of the efficiency of a hybrid solar collector in a heat supply system consisting of two separate units, namely a heat storage tank and a flat solar collector, which are interconnected by pipelines. The study includes the analysis and calculation of the thermal parameters of the system for one day and the determination of the optimal values of the flow rate of the heat carrier in the solar collector and the mass of the heat carrier in the heat storage tank to achieve maximum thermal efficiency of the system.
The article presents the modeling mechanism of the error determination when making financial decisions in conditions of uncertainty and risk. Researched modeling is based on using the assessing of the diagnosed level of enterprises' economic security with help of mathematical description and calculations of probability transitions matrix and using the research method, the method of direct and reverse interpolation, averaging, statistical and index method, root mean square error method, simulation modeling, probability theory method, matrix method, etc. It has been studied that the most di
The article presents the development and analysis of the models of various IDT designs and for the acoustophoretic control of microparticles in of lab chip microchannels. The novelty of the work consists in the development of mathematical models for new configurations of IDT, suitable for focusing, sorting and concentrating of heterogeneous microparticles. The developed models are implemented in the COMSOL environment, which allows the designer to use them for the calculation of the specified IDT structures for real acoustofluidic lab-chips.
The problems and solutions in the logistics of warehouse operations of the transport company are highlighted. The software for the implementation of the simulation model is defined. Simulation modeling of the functioning of the transport company's composition was carried out. The main stages in the implementation of the simulation model are considered. Created a context diagram for the simulation model and refined it using context diagram decomposition. The stages of creating a simulation model in FlexSim are considered.
We consider waste management and management as an area of ecological safety. As a result of the study, the ecological aspects of this branch of activity were analyzed on the example of the operation of the operating MSW landfill in the city of Kremenchuk. The prospective direction of the field of waste management in the region, as well as the state of its financing, are taken into account. Such dangerous factors in the operation of the municipal landfill for the environment as: pollution of groundwater and open dumps of the landfill have been identified.