This paper presents a detailed circuit analysis and PWM implementation of a fuel cell based Z-source converter using L and C components. The Z-source converter uses the shoot-through that simultaneously turns on both power switches in a leg in order to boost a DC-link voltage. A discrete time state space model of the Z-source converter is given for DSP implementation. Also, a modified space vector pulse width modulation is described in detail for stepping up the DC-link voltage and generating a sinusoidal AC output voltage. To verify the effectiveness of the analyzed circuit model and modified space vector PWM technique, simulation results using Matlab/Simulink will be presented under an open-loop control and a closed loop control.

This study was conducted during summer and winter of 2018- 2019 in the agricultural research field of Shahid Chamran University. Experimental design was split- plot based on RCBD with three replications. The main plot was the type of agricultural system in three levels including conventional (Conv), organic (Org) and sustainable (Sust) (integrated between Conv and Org) and sup- plot was the type of pre- cultivated crop in sequence with wheat including cultivation of mung bean (M- W), corn (C- W), sesame (S- W) and fallow (F- W). Yield quantity (yield and its component) and quality (grain protein), an estimate of photosynthesis matter transfer index of wheat and soil organic carbon (SOC) after one double-cropping were measured. The result showed that the highest (545.04 g/m2) and the lowest (409.28 g/m2) seed yields were obtained in Conv and Org respectively. In contract, with the changing type of system from Conv to Org, grain protein was increased significantly (from 8.3 to 9.6 %). In addition, the highest (535.47 g/m2) yield of wheat was obtained from M- W double cropping. On the other hands the highest remobilization and current photosynthesis matter were obtained in the organic agricultural system with M- W and conventional with M- W double cropping. The situation of SOC showed that the highest (33.18 mg/g) SOC was obtained in the organic agricultural system with C- W double cropping. The reason for improving SOC in the organic and sustainable agricultural system was application of organic matter (compost and vermicompost) and crop residue management. Totally, from the crop ecology point of view, sustainable agricultural method with a sequence of M- W was the most desirable system.

Distributed storage Systems are mainly justified due to their ability to store data reliably over some unreliable nodes such that the system can have long term durability. Recently, regenerating codes are proposed to make a balance between the repair bandwidth and the storage capacity per node. This is achieved through using the notion of network coding approach. In this paper, a new variation of these codes, called hybrid regenerating codes incorporating a super node is proposed, showing in some cases the new code outperforming existing regenerating codes in terms of the repair bandwidth and/or download cost.

The operation of Fuel Cell Distributed Generation (FCDG) Systems in distribution Systems is introduced by modeling, controller design, and simulation study of a Solid Oxide Fuel Cell (SaFe) Distributed generation (DG) system. The physical model of the fuel cell stack and dynamic models of power conditioning units are described. Then, suitable control architecture based on fuzzy logic control for the overall system is presented in order to active power control and power quality improvement. A MATLAB/Simulink simulation model is developed for the SOFC DG system by combining the individual component models and the controllers designed for the power conditioning units.Simulation results are given to show the overall system performance including active power control and voltage regulation capability of the distribution system. 

In Distributed Systems, there are two basic methods in which mutual exclusion is achieved. In the first method, one process, running on one of the machines, is assigned for coordinating purposes. In the second method, mutual exclusion is obtained in Distributed ways and not single point of decision-making exists. A basic queuing model of the system is presented in the case where communication speed is high, and steady state behavior of the system is expressed by a set of equilibrium equations. It is then analytically solved. A general model of the system is obtained and a systematic method for producing the set of equilibrium equations is produced. Both models are based on central coordination method. Analytical or numerical solutions are used to improve the total system performance.