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.

Multi-agent systems are systems in which several agents accomplish a mission in a cooperative manner. In this paper, a novel idea for the construction of a movable runway platform based on multi-agent systems is presented. It is assumed that an aerial agent (quadrotor) decides to make an emergency landing due to reasons such as a decrease in energy level or technical failure, while there is no suitable platform for landing or the agent is not able to reach another place for landing. The goal is to create a specific formation pattern by a group of mobile robots that are smaller than the aerial agent, so that it can land on them. Each of the mobile robots is equipped with flat grid landing pad in its upper part so that when the robots approach each other and form a specific geometric arrangement (such as a pentagon), the landing pads are connected to each other and create a wider platform for landing. Cooperative Control of agents (from aerial agent Control to mobile robot formation Control) is the main goal of this article, which is presented in different dynamic models under directed graph along with proof of Lyapunov-based stability analysis.

Networked Control systems (NCS) is a new field in Control systems that has emerged by the use of communication networks in Control systems. NCS refers to a Control system in which sensors, actuators, and Controllers are connected via a communication network and enable remote monitoring and Control. The use of communication networks in Control systems have many advantages, like reducing the cost of wiring, increasing flexibility, and improving scalability. However, the integration of communication networks in Control systems will also carries new challenges such as data transmission delay, data packet loss, and network congestion, that require new methods for modeling and designing Control systems. Research in the networked Control systems is focused on the development of new modeling, estimating, identifying, and designing methods, which the effects of communication networks on the system’s behavior will be taken into account. In general, the field of NCS is an important research area because it allows the Control systems to be applied in a wide range of applications and develop it in more efficient and flexible way. NCS can be found in various applications such as industrial automation, smart energy grids, transportation systems, and house automation. This article describes the emergence of Control systems from the field of continuous time to networked Control and compares it with traditional Control systems. Furthermore, the most important challenges in NCS and related approaches will be discussed. Important applications of networked Control systems by reviewing some featured case studies in Iran and other countries are also discussed. In the end, possible future directions in the development of networked Control systems will be presented.

In this paper, we consider nonlinear Control system of the form: dx/dt= Ax- bξ, dξ/dt=f(σ), σ=cTx- ρξ Using liapounov function and liapounov method, we first establish the stability of system (obtaining some relation between Control parameters). Secondly, we give an example which clarifies our method.

A common method for Controlling a group of parallel converters in decentralized Control strategy structure in an island microgrid, the use is the droop-down characteristics of frequency ω-P and voltage E-Q. However, the problem with using this method is that the reactive power is not properly distributed (in proportion to the capacity of the micronutrients) between the micronutrients, which may lead to overload in the converters. Microgrids may also suffer from dynamic stability problems such as power fluctuations, which can be increased by switching between active and reactive power Control. To avoid this problem, the X / R ratio of transmission lines is an important parameter that should be carefully considered in the design of micronutrient Controllers. By linearizing and simplifying conditions, the Control system conversion function model becomes a single input-single output system, which is efficient enough to show the relationship between Control parameters such as slope of droop characteristics and derivative sentences, virtual impedance, and voltage Controllers. Using this model, stability conditions for different parameters are analyzed. Also, to improve power distribution stability, common droop strategies are modified by adjusting the slope as well as adding nonlinear sentence sections. This approach reduces the coupling between active and reactive power Control and reduces the dependence of power distribution on grid parameters such as the X / R ratio. To evaluate the reliability of the proposed model, the simulation results in a sample island microgrid in MATLAB software are presented.