Modeling Of Electromagnetic Field Distribution Research Articles

Технологии лазера с распределенной обратной связью и резонатора «мод шепчущей галереи» для оптоэлектронного генератора РЛС

Technologies for creating microresonators based on the effect «whispering gallery modes» (WGM) and distributed feedback (DFB) lasers used in an optoelectronic generator (OEO) are investigated and generalized. The calculation of the natural frequencies WGM resonator and DFB laser is presented. Software modeling of electromagnetic field distribution in MATLAB environment is implemented. An approach to the manufacturing technology DFB laser with a low-level phase noise based on a photonic crystal (PC) is proposed. The possibility of using this laser and resonator in an optoelectronic system for generating an ultrahigh frequency (UHF) signal to create coherent microwave photonic radars is considered. The advantages of these lasers for creating a single master OEO of promising multi-band radar are shown.

Optimization of the carbon nanotubes synthesis in arc discharge systems

PurposeThe purpose of this paper is to focus on the influence of electromagnetic field during the arc discharge carbon nanotubes synthesis. It proposes modeling of electromagnetic field distribution to calculate forces in the area of arcing. The paper presents the influence of this field on the final product of the synthesis.Design/methodology/approachA short literature review of the arc discharge systems supported by electromagnetic field is presented. The technical solution of the coil placement is discussed. An experimental research is described. The research system constructed preceded by a series of measurements and modeling is analyzed.FindingsThe paper describes the significant meaning of the electromagnetic field during the synthesis. The electromagnetic field forces the slow rotation of the carbon plasma column where carbon nanotubes are formed. It leads to the improvement in yield.Research limitations/implicationsBecause the research is limited to one type of geometry of the reactor, the results may vary in different reactors. However, the influence of the electromagnetic field is confirmed. Therefore, researchers are encouraged to investigate the influence of the electromagnetic coil in the applied systems.Practical implicationsThe systems with a coil inside the reactor require the application of complex cooling systems or/and additional screens. The work proposes a technical solution based on the coil placed outside the reactor. Therefore, it simplifies the construction and increases the yield.Social implicationsThe high yield of the high-quality nanotubes opens new technical possibilities for electronics and electrical engineering.Originality/valueThe paper identifies a connection between the electromagnetic field, the arc discharge movement, plasma jet, carbon nanotubes containing deposit and the yield.

Аналитическое моделирование распределения электромагнитного поля на зубцовом делении массивного зубчатого ротора

Аналитическое моделирование распределения электромагнитного поля на зубцовом делении массивного зубчатого ротора