Advanced Materials Research Vols. 225-226

Abstract: In this paper, using Matlab to solve Soave-Redlich-Kwong (SRK) EOS, as well as the estimation of pure component properties, plotting of vapor-liquid equilibrium (VLE) diagram and calculation of chemical equilibrium, is presented. First the SRK EOS is used to predict several pure-component properties, such as liquid and gas molar volumes for isobutane. The vapor-liquid isobaric diagram is then plotted for a binary mixture composed of n-pentane and n-hexane under the pressures of 1.5*10^5 and 7*10^5 Pa respectively. Finally, the extent of ammonia synthesis reaction under high pressure is calculated.

Abstract: A control strategy which is based on the Catalytic Divided Wall Column (CDWC) for hydrolysis of methyl acetate (MeAc) is studied and a feasible control structure is obtained. The manipulated variables and controlled variables are selected and paired. Two kinds of disturbances are employed to test this control configuration and the result shows that a simple PI control scheme with three temperature loops can obtain reasonable control performance and maintains the desired purity of two products and stoichiometric balance between reactants.

Abstract: The heat coupled distillation column which applies the principle of internal heat integration between the rectifying section and the stripping section of a distillation column by increasing the temperature of the rectifying section with a compressor attracts extensive attention worldwide for its high thermodynamic efficiency. In this study, the economic features of a heat coupled distillation column (HCDC) are investigated and compared to a conventional column and a commercial column with vapor recompression system (VRC) for the separation of propylene-propane mixture. The economic analysis indicates that HCDC has 10 – 20 % total annual cost (TAC) saving associated with VRC, which appeared to be strongly sensitive to the pressure ratio.

Abstract: Microgrid system, as the carrier of control strategy, can provide verification platform for the research. This paper discusses the control strategy firstly. And then an integrated microgrid system with multi-microgrid structure, containing a variety of distributed generations, energy storage systems, diesel generator and adjustable loads, is introduced. The control strategy of the microgrid system which adopts master-slave control strategy is discussed in detail. The result shows that the mircogrid system using control strategy proposed in this paper can transfer flexibly between grid-connected and islanded mode. This system is able to work well with operation control and other related technologies.

Abstract: This paper establishes current control model of grid-connected inverter in synchronous rotating frame. Based on the model, a new control strategy which is combined with PI regulation, decoupling, and feed-forward compensation is proposed. Software algorithms are designed in this paper. Based on TMS320LF2407A and IPM Module PM50RLA12, experimental platform for grid-connected inverter is built. Experimental waveforms are given in the paper.

Abstract: Maximum Power Point Tracking (MPPT) is an important means to improve efficiency of PV power systems. The simulation model achieving MPPT of independence PV power system, BOOST circuit as the core, is established. The model can simulate the implementation of PV arrays and MPPT without exact characteristics and parameters of the internal circuit. The simulation results show that the closed-loop system can track the maximum power point of PV and work stably in the maximum power point. It can fast track to the corresponding maximum power point in the case of environment changes. The requirements of steady and accurate of auto follower system are achieved.

Abstract: With the increasingly wide range applications of Web and the continue development of Web development technology, developers urgently need a framework to simplify the development process, reduce development effort and improve development efficiency. Rails is a Web framework which is more realistic and more efficient, it has the advantages of rapid development system of PHP and the advantages of structured programs of Java. So this paper analyzed the architecture of Rails framework in-depth, and designed an information system of auto leasehold management with the characteristics of Rails framework. The system realized unified and real-time management for the branches, the network traffic, orders and settlement data. The validity and efficiency of the system was validated via test-experiment. The results show that the system can enhance the standardized management of car rental, improve the management level and the information degree of the cars rental industry. At the same time, it can also increase the crackdown of car rental fraud, establish safe and effective prevention mechanisms, and reduce the loss of car rental.

Abstract: Paper removed due to copyright divergences

Abstract: In order to diagnose the health state of Aircraft effectively, a new method based on ARMA Model and probabilistic neural network(PNN) is proposed in this paper. First, an ARMA model is built using the original acoustic emission signal of aircraft crucial components, then use the autoregressive approximation theory to estimate model parameters, and order of the model is calculated according to Akaike Information Criterion(AIC). Use the autoregressive parameters to build feature vectors, then the probabilistic neural network is used to carry out the recognition of these feature vectors, and the health state of aircraft crucial components is effectively diagnosed. After the application on certain type of real aircraft, this method is proved to be capable of detecting the fatigue crack on crucial structural components. And we can conclude that the method is an effective way to carry out aircraft health diagnosis.

Abstract: Localization of the sensor nodes is a major obstacle for practical applications of video sensor networks. This paper present a novel localization technique based on vision in wireless sensor networks. On the assumption that sensor nodes can be recognized in an image, a sensor node firstly direct its Field-of-View (FoV) to an anchor or localized node, then we can get the orientation of anchor node relate to the sensor node to be localized. If two or more anchors can be found in sensing area, a series of equations will be obtained. They can be solved using minimum mean square error rule, and the solution of the overdetermined equations mentioned above is the estimation of the node position. The experiments indicate that a promising performance can be achieved in determining the exact node location using a small number of anchors.