Single-mirror beam steering system: analysis and synthesis of high-order conic-section scan patterns

2008 ◽  
Vol 47 (3) ◽  
pp. 386 ◽  
Author(s):  
Yajun Li
Author(s):  
V. Skibchyk ◽  
V. Dnes ◽  
R. Kudrynetskyi ◽  
O. Krypuch

Аnnotation Purpose. To increase the efficiency of technological processes of grain harvesting by large-scale agricultural producers due to the rational use of combine harvesters available on the farm. Methods. In the course of the research the methods of system analysis and synthesis, induction and deduction, system-factor and system-event approaches, graphic method were used. Results. Characteristic events that occur during the harvesting of grain crops, both within a single production unit and the entire agricultural producer are identified. A method for predicting time intervals of use and downtime of combine harvesters of production units has been developed. The roadmap of substantiation the rational seasonal scenario of the use of grain harvesters of large-scale agricultural producers is developed, which allows estimating the efficiency of each of the scenarios of multivariate placement of grain harvesters on fields taking into account influence of natural production and agrometeorological factors on the efficiency of technological cultures. Conclusions 1. Known scientific and methodological approaches to optimization of machine used in agriculture do not take into account the risks of losses of crops due to late harvesting, as well as seasonal natural and agrometeorological conditions of each production unit of the farmer, which requires a new approach to the rational use of rational seasonal combines of large agricultural producers. 2. The developed new approach to the substantiation of the rational seasonal scenario of the use of combined harvesters of large-scale agricultural producers allows taking into account the costs of harvesting of grain and the cost of the lost crop because of the lateness of harvesting at optimum variants of attraction of additional free combine harvesters. provides more profit. 3. The practical application of the developed road map will allow large-scale agricultural producers to use combine harvesters more efficiently and reduce harvesting costs. Keywords: combine harvesters, use, production divisions, risk, seasonal scenario, large-scale agricultural producers.


2014 ◽  
Vol 53 (25) ◽  
pp. 5775 ◽  
Author(s):  
Yuan Zhou ◽  
Yafei Lu ◽  
Mo Hei ◽  
Guangcan Liu ◽  
Dapeng Fan

2021 ◽  
Author(s):  
Jingru Wang ◽  
Yuehe Ge ◽  
Zhizhang (David) Chen ◽  
Zhimeng Xu ◽  
Hai Zhang

Abstract Optical metasurfaces are researched more and more intensively for the possible realization of lightweight and compact optical devices with novel functionalities. In this paper, a new beam-steering system based on double metasurface lenses (metalenses) is proposed and developed. The proposed system is lightweight, small volume, low cost, and easy to integrate. The exact forward and inverse solutions are derived respectively using the generalized Snell’s law of refraction. Given the orientations of the double metalenses, the pointing position can be accurately determined. If the desired pointing position is given, the required metalenses’ orientations can be obtained by applied global optimization algorithms to solve nonlinear equations related to the inverse problem. The relationships of the scan region and blind zone with the system parameters are derived. The method to eliminate the blind zone is given. Comparison with double Risley-prism systems is also conducted. This work provides a new approach to control light beams.


2021 ◽  
pp. 12-20
Author(s):  
Sergey Kondakov ◽  
◽  
Ilya Rud ◽  

Purpose of work: development of a model of the process of conducting a computer attack. Research method: theory of complex systems, comparative analysis within the framework of system analysis and synthesis. Result: it is shown that the application of the proposed model of the process of conducting computer attacks allows you to fully describe the process, taking into account its inherent features and characteristics. The use in the model of information from the MITRE ATTACK database of Mitre, which contains a description of the tactics, techniques and methods used by cybercriminals, allows you to reduce the level of abstraction and describe specific scenarios for conducting complex targeted computer attacks with the maximum approximation to practice. The developed model is supposed to be used to form scenarios of computer attacks when assessing the security of information systems.


Author(s):  
Svetlana Nesterenko

Purpose – тo generalize methodical approaches to the interpretation of the category of capitalization in the forestry complex and to identify sources of funds that can provide an additional financial basis for the capitalization of forest resources. Research methodology. In the context of this work, the method of system analysis and synthesis was used, as well as a comparative method, which allowed to determine the optimal approach to the identified issues. Scientific novelty. The article summarizes the existing interpretations of the concept of capitalization, according to which the main methodological approaches to it are highlighted, in particular, as: the process of attracting and increasing the value of any assets (resources); the process of transformation of factors of production (assets, resources) into capital; performance of the entity. The article forms directions and relevant additional sources of funds for the use of forest resources, which can provide an additional financial basis for the capitalization of forest resources (assets). Conclusions. It is established that today it is impossible to assess forest assets as a source of environmental and social functions, as there is no methodology for calculating their value. It is noted that the only approach to the assessment of forest resources is only the actual cost of part of forestry products, including by- products and in-use use, hunting, harvesting of secondary forest materials and, accordingly, capitalization of only part of rent in real sales prices. period of restoration and formation of forest stands. Key words: capitalization, forestry complex, forestry assets, forest rent, sources of financing.


1975 ◽  
Vol 2 (6) ◽  
pp. 330-331 ◽  
Author(s):  
H.V. Cane

This paper is a preliminary report on the sky mapping being undertaken at the University of Tasmania using the Llanherne low frequency array. (Ellis 1972).The observations are facilitated by the use of an on-line PDP-8 computer and the beam steering system described by Whitham (1975). In summary, a scanning system is used in which the computer is programmed to steer the telescope beam to a number of declinations with a time interval between settings such that a scan takes 5 minutes. Usually a scan of 12 declinations is chosen. Calibration levels obtained each hour and recorded on magnetic tape permit gain changes to be accounted for when the data is analysed from the tape.


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