THE MASSES OF THE IONIZED GAS OF PLANETARY NEBULAE ENVELOPES IN LARGE MAGELLANIC CLOUD

The masses of ionized gas in the shells of planetary nebulae which belong in the Large Magellanic Cloud are calculated by three different ways. The value of mass is calculated for the cases: 1) spherical, 2) elliptical forms of envelopes and 3) commonly known method based on the line ratio F(Hβ) of the shell to its emissivity of  ε(Hβ). It is shown that the values of masses Mi  of nebulae envelopes differ up to 50%. The values of  Mi  calculated by the other methods which differ more from previous ones. We consider the dependence of Mi  on the radius and the electron density in the envelopes of nebulae. The masses of ionized gas in the shells of planetary nebulae which belong in the Large Magellanic Cloud are calculated by three different ways. The value of mass is calculated for the cases: 1) spherical, 2) elliptical forms of envelopes and 3) commonly known method based on the line ratio F(Hβ) of the shell to its emissivity of  ε(Hβ). It is shown that the values of masses Mi  of nebulae envelopes differ up to 50%. The values of  Mi  calculated by the other methods which differ more from previous ones. We consider the dependence of Mi  on the radius and the electron density in the envelopes of nebulae.

Verilog – ams model of comb-drive sensing element of integrated capacitive microaccelerometer for behavioral level of computer aid design

The article presents Verilog – AMS model of the comb-drive sensing element of the integrated capacitive microaccelerometer. The suggested model allows to simulate the reaction of the sensing element effected by the applied force of acceleration, changes of its comb-drive capacities, output voltages and currents for determining its constructive parameters and for analysis of the mechanical module of the integrated device at the behavioral level of computer-aided design

CHEMICAL COMPOSITIONS OF CRAB NEBULA FILAMENTS

The chemical compositions in filaments of Crab Nebula are obtained using two methods: new Ionization Correction Factors taking in to account density in homogeneities f the nebular gas, and new 3-stages method based on the optimized photoionization modeling of the nebular gas.The chemical compositions in filaments of Crab Nebula are obtained using two methods: new Ionization Correction Factors taking in to account density in homogeneities f the nebular gas, and new 3-stages method based on the optimized photoionization modeling of the nebular gas

Development of the basic acoustic elements models on the base of the VHDL – AMS language for computer-aided design at the schemotechnical level

In this paper the basic acoustic elements models are developed on the base of the VHDL-AMS language. Constructed models are based on the thin plates theory and are intended to be used in computer-aided design at the schematic level of basic acoustic MEMS elements. The results of the models for basic acoustic elements of piezoelectric and electrostatic types investigation are also presented

MULTI-STAGES OPTIMIZED PHOTOIONIZATION MODELLING OF PLANETARY NEBULA LMC SMP-21

The new approximation expression for the representation of gas density distribution in planetary nebulae envelopes was proposed. The new multi-stages method for the caclulation of the chemical composition and physical parameters of planetary nebulae envelopes based on the optimized photoionization modelling was described. This method was used to the determination of physical characteristics and chemical composition in PN LMC SMP-21