A new switching strategy of PWM inverter is presented which can be used at high fundamental PWM voltages, the full theoretical of "double modulation"is presented.
1. Through the combined use of shock initiation theory, effective charge theory,congregated effect theory, wave shaping theory as well as corner effect theory, this paperdesigned cylinder outside concave spherical booster and taper outside concave sphericalbooster ,and gave their initiation features a full theoretical analysis.
1. Through the combined use of shock initiation theory, effective charge theory, mohaupt effect theory, wave shaping theory as well as corner effect theory, this paper designed the following four booster charge structures: annular structure, conical annular structure, concave spherical structure and half-spherical structure, and gave their initiation features a full theoretical analysis.
The article deals with the composition of the catalysts and its catalysis principle and designs the ingredient of the catalyst with full theoretical basis.
How to correctly understand the teaching evaluation of college PE class,to formulate a full theoretical system of the teaching evaluation of college PE class,to probe the scientific method and technology of PE teaching evaluation - all these problems are worth concerning in the reform and practice.
The use of a new plasma- activated sintering (PAS) process to densify aluminum nitride (AIN) powders to nearly full theoretical density (97 to >amp;gt;99%) in 5 to 10 min was investigated.
Thermal cycling is found to increase the rate of densification by a factor of 3 to 5.5 relative to isothermal annealing at the upper cycling temperature, allowing for recovery of full theoretical density in a shorter time.
This paper gives a full theoretical solution of the obtainable nanostructure shapes by nanosphere lithography utilizing oblique deposition and perpendicular etching.
A new method for numerical modelling of aquatic environments is presented in this paper. It is based on a hybrid method of fractional steps using triangular grids and with L∞-stability. An upwind discretization scheme or a modified characteristics procedure is used for convection operator, the lumping finite element techniqe for diffusion calculation. Stability analysis proved in detailshows that the scheme is L∞-stable unde conditions: (1) Δt≤min(2d/V, d2/3K)where V = max(u2 + v2)~1/2 , d = the minimum per...
In this paper, a structure of CCC was introduced. It, without short-circuit of Hall field,utilizes compensation source to consolidate electrode currents with different terminal potentials to a common point. The structures and features are described in detail, and the relationships between the reactive power, harmonics of CCC and MHD channel parameters are derived when the stuctures of CCC transformer secondaries are 3-phase wye, 6-phase double-wye and 6-phase double-wye with the turn-off devices. It provide...