The new standard for DVB-RCS includes guidelines for mobile user in the market of aircraft, maritime and terrestrial transportation. The standard proposed by ETSI suggests the possibility of using a continuous carrier operation mode in the return channel, beside the classical MF-TDMA mode for better adapting the satellite bandwidth to the new requests of mobile users. It can be important a mech...

A key component of switch-mode hydraulic circuits is a highspeed two-position three-way valve with a variable duty cycle. This paper presents a new valve architecture that consists of two valve spools that are axially driven by crank-slider mechanisms. By phase shifting the two crank links, which are on a common crankshaft, the duty cycle of the valve is adjusted. The two spools split and re-co...

Knowledge concerning the complicated changes of mass and heat transfer is desired to improve the performance and durability of unitized regenerative fuel cells (URFCs). In this study, a transient, non-isothermal, single-phase, and multi-physics mathematical model for a URFC based on the proton exchange membrane is generated to investigate transient responses in the process of operation mode swi...

An analysis of a dual active bridge (DAB) converter under soft-switching mode in the whole operating range is presented in this paper. A detailed study of the impact of the transformer magnetizing inductance, LM , and snubber capacitance, Cxx, parameters on the soft-switching regions is carried out to obtain some design considerations. Simulation and experimental results which validate the theo...

The multi-phase implementation in the QR (quasi resonant) ZCS (zero current switching) SC (switched capacitor) bidirectional DC-DC converter structure has been proposed to reduce current ripple, switching loss and significantly increase the converter efficiency and power density. This approach provides a more precise output voltage to obtain voltage conversion ratios from the double-mode versus...

We show here that dynamic-mode cantilever sensors enable acoustofluidic fluid mixing and trapping of suspended particles as well as the rapid manipulation and release of trapped micro-particles via mode switching in liquid. Resonant modes of piezoelectric cantilever sensors over the 0 to 8 MHz frequency range are investigated. Sensor impedance response, flow visualization studies using dye and ...

This communication describes the design of a microelectronic BiCMOS analog circuit, intended to be applied to the sliding-mode control of switching DC-DC power converters for the application of generating a sinusoidal signal with externally adjustable amplitude, frequency and offset. The circuit implements a sliding law over a nonlinear autonomous switching surface. The proposal of this analog ...

The theory and design of an inexpensive rotating analyzer unit is presented, which allows a conventional null type ellipsometer to work as rotating analyzer–fixed analyzer automatic ellipsometer, without sacrificing the possibility to work in null mode. The mode switching is performed simply by adding or removing the rotating analyzer from its holder. It is shown that the rotating analyzer phas...

Energy dissipation during testing has been discovered to be more than during regular mode due to increased switching activity. Test Sequence restructuring approach helps mitigate this problem as it allows the decrease of switching action during testing. This research presents a new Test Sequence restructuring approach. A cross model of genetic and pharaonis algorithms devised to restructure the...

The problem of optimal switching and control of nonlinear switching systems with controlled subsystems is investigated in this study where the mode sequence and the switching times between the modes are unspecified. An approximate dynamic programming based method is developed which provides a feedback solution for unspecified initial conditions and different final times. The convergence of the ...