Relevance. The research discusses the actual risks that can arise from the formation of the radioisotope cobalt 60Co from the stable isotope 59Co during radiation neutron capture, which is specific to repair work at a nuclear power plant, but these risks are poorly understood. Aim. The research aims to analyse the possibility of additional exposure to ionising radiation for the repair personnel of a nuclear power plant due to the use of a repair tool that may contain cobalt. Methodology. The physical-theoretical and analytical approaches are used in the study. Results. A certain risk has been identified as a result of the use of drills or other tools for cutting metal containing cobalt among the repair tools. The calculation (analysis) of the activation of a cobalt-containing drill bit showed that a drill bit weighing 500 g containing 8% of 59Co in the tool steel acquires a partial activity (i.e., only cobalt activity) of 5.397 × 10-8 Ci, which leads to gamma radiation with an exposure dose rate of 0.024 mSv/year. The calculations of dose rates did not consider gamma radiation from the nuclear isomeric transition 60mCo→60Co, which could only worsen the radiation risk picture (when considering other examples). Conclusions. The use of a drill bit with the cobalt content specified in the calculations (or the location of the drill bit in the vicinity of the personnel), one way or another, contributes to the personnel exposure. It is proved that the calculation was not conservative, but rather liberal, because gamma radiation from the 60mCo isomer was not considered, otherwise, the obtained numerical values would have been higher. A practical recommendation to prohibit or reduce the use of tools containing cobalt during repairs on nuclear power plant equipment was made, theoretically, given that the analytically justified need to study the issue of radiation safety is relevant and vital for the safety of NPP maintenance personnel
Анотація-Розглянуто використання та порівняльний аналіз дискретних спектральних перетворень Фур'є, Хартлі, Віленкіна-Крестенсона та перетворення в орієнтованому базисі при розв'язанні задачі аналізу часової залежності потужності споживання у локальних об'єктах типу MicroGrid. Порівняння спектральних методів здійснювалося за критеріями кількості обчислювальних операцій, простоти та точності розрахунків. Розглянуто амплітудочастотні та фазо-частотні спектри досліджуваного сигналу для різних спектральних методів. Ключові слова -спектральний аналіз; вейвлет-аналіз; перетворення Фур'є; перетворення Хартлі; перетворення в орієнтованому базисі; перетворення Віленкіна-Крестенсона
Access systems with face recognition is widely used today. They are used in many enterprises and institutes where it is necessary to control the flow of passing people. Facially recognizable technical vision systems are important because they can be used to store specific individuals faces and use them for access control. As a result of analysis of same modern systems the variant of system there are additional functions is offered. The system consists of ESP-EYE module, with build-in wi-fi and Bluetooth modules, chip sensor camera “ OV2640” and LED display, which dasplays a notification for a person about granting or denying access, notifications are in two collors: geen and red respectively.. Also it has an emergency power supply in case of unforeseen situations. Wi-fi is used as a means of transmiting data from camera to the server. This transmition method of data transmition has several advantages over Bluetooth. It allows to the system to transfer data at a much higher speed and over a grater distance, it is also more secure, provides access to the internet and allows to control the system remotely. All the listed advantages of this method of transmition give us a great variability in the operation and placement of the system. To recognize people system use a comparison method. It compares the person’s face with a database and, after processing it produces the result. To optimize and speed up this process, the system uses a method of image compression based on discrete wavelet transform. This method is the transmission of a signal through several filtres, usualy two. First, the signal is passed through a low-pass filter whis a pulse response g, resulting in an output signal in the form of a convolutional sum. At the same time the signal is decomposed by a high pass filter. The LPF gives an approximate shape of the output signal, and the HPF – the signal of difference or additional detail. Discrete wavelet transform in an oriented basis makes it possible to construct transformation matrices with a given number of filters ”m”, where “m” is in the general case a prime positive number. The simplest way to compare the two images is by substracting the brightness values of the two matrices and estimating the resulting matrix of differences using standard deviation. The use of standard deviation in combination with fiberboard in OB allows to speed up the process of face recognition in the system by discarding unncessary details, the absence of which minimaly harms the accuracy of the results. The advantages of this system are that it is less expensive, in compareson with existing analogs, less energy-consuming, easy to assemble and install, uses a relatively simple and at the same time quite accurate method of identidying a persons identity.
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