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We consider nonlinear nonhomogeneous Dirichlet problems driven by the sum of a p-Laplacian and a Laplacian. The hypotheses on the reaction term incorporate problems resonant at both ±∞ and zero. We consider both cases p>2 and 1<p<2 (singular case) and we prove four multiplicity theorems producing three or four nontrivial solutions. For the case p>2 we provide precise sign information for...
Miniaturization is very important for modern communication systems. This paper presents new bandpass filters with low insertion loss and multi-band as well as wide stopband properties, and new bandstop filters with dual-rejectband and sharp attenuation to get nicer frequency selectivity by using miniature microstrip isosceles triangular resonator, and filter coupling schemes are given and discussed...
We study the existence of periodic solutions for a third-order equation of resonant type. Under suitable conditions we prove the existence of at least one periodic solution of the problem applying Mawhin coincidence degree theory.
This paper presents a zero-voltage and zero-current soft-switching (ZVZCS) PWM three phase inverter with a single auxiliary resonant commutation cell. All of the main switches in the three-phase inverter side can be turned on and turned off under zero-voltage and zero-current condition. The operating principle of proposed commutation cell is described, and the procedure to determine the optimum circuit...
This paper presents a zero-voltage and zero-current soft-switching (ZVZCS) PWM three phase inverter with a single auxiliary resonant commutation cell. All of the main switches in the three-phase inverter side can be turned on and turned off under zero-voltage and zero-current condition. The operating principle of proposed commutation cell is described, and the procedure to determine the optimum circuit...
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