Applied Mechanics and Materials Vols. 71-78

Abstract: According to the characteristics of regional FEEEP coordinated growth, the influential factors index system of regional FEEEP coordinated growth is constructed. Using the DEMATEL method, the interactions among factors are analyzed, and the most important factors of regional FEEEP coordinated growth are found.

Abstract: In this paper, an improved GA was proposed to minimum the disadvantages of classic GA. This modified GA improved the crossover and mutation strategy by using of sort program to arrange chromosome from big to small. The crossover probability and mutation probability were decided by the numbers of the order. Samples were chosen to take part in interbreeding. The convergence speed and results can be improved in this way. Moreover, premature convergence and local convergence were avoided at the same time. The modified GA was implemented by an optimization program compiled in visual C++ language. It has been successfully applied in the reactive power optimization of a Hydropower station. The results showed the feasibility and validity of this modified genetic algorithm.

Abstract: The progress of Artificial intelligence and Information technology has been driving research of intelligent diagnosing, and the efficiency of diagnosis is improved by disease diagnosing system .In this paper, we analyze the comparability and relativity between fuzzy similarity distance and disease diagnosis, and initiate the theoretical model of fuzzy-distance on the basis of fuzzy membership factors vectors, and some corresponding data structure. In addition, the inference algorithm and the hierarchy of system are brought forward. Experimentation statistics demonstrate that the novel diagnosis system could obtain a satisfying accuracy rate of diagnosis, and low a rate of misdiagnosis effectively.

Abstract: SCADA System, which is used to control the transfer of natural gas from long distance has been introduced in this paper. The system is based on Modicon TSX Quantum series 140 CPU 113 03 of Schneider as Program Logic Computer, industrial internet as the communication mode, telephone dialing as the supplementary communication mode and Intouch as the makeup software. All of them work together to automatic control and supervise the transfer of natural gas in a long distance.

Abstract: Based on the historic and current status of the development of tidal power station, the developments of tidal power station is reviewed in this paper, including unit selection, hydropower calculations, station construction and integrated management. Thus, operating Principle, various technical problems and improving technologies of tidal power station management are systematically analyzed. Then, combined with the latest advances of current research of tidal power, the tendency and further research on operation management of tidal power station is presented in the end.

Abstract: There are a lot of pipelines whose heat loss exceeds the limit of national standards after they are used a period of time in refining pipeline insulation engineering. Thermal defects are easily found on the pipeline surface by using a infrared thermal imager.There are two kinds of thermal defects on these pipelines. One is settlement of insulation layer; the other is seam in lap joints of insulation protection casing. Numerical simulation is developed in this paper for these two cases. Heat loss and surface temperature of pipelines are calculated to verify if the value has exceeded the limit of national standards. Some improving suggestions are also given in this paper.

Abstract: The unsteady state mathematic model was utilized to compute the transient temperature field and determine the heating power, and then a set of thermal insulating system for the wellhead of the snubbing service equipment was designed and manufactured based on the mapping of the material object. The result shows that the numerical results of the cartridge heater’s temperature field agree with the testing values. The thermal insulating system for the wellhead of the snubbing service equipment meets the needs of the snubbing service in the winter; the system possesses the merits of rapid rate of temperature rise, well thermal insulating, safety and convenience.

Abstract: In the paper, we take current relatively advanced, the most widely used flash smelting furnace, converter and rotary anode furnace as the examples, the waste heat resources of the process of matte smelting, the process of matte converting and the process of fire refining of blister copper in copper pyrometallurgy are analyzed respectively. Meanwhile, based on the way of using waste heat reasonably to suitable heat consumer in production process and the grade recovery principle of energy level matching, the model of waste heat recovery and reuse of flue gas in copper pyrometallurgy is constructed.

Abstract: Butadiene is a kind of important material in the chemical engineering, and it is inflammable and explosive. Once it leaks to the air, fire and explosion accident may happen. In the current experiment, the Butadiene tank in a chemical plant was taken as the example to analyze the potential hazards that the tank may cause. Some mathematical models, such as the UVCE（the Unconfined Vapor Cloud Explosion） and the BLEVE（the Boiling Liquid Expanding Vapor Explosion）, were used to describe the results that the hazards may lead to，so that it could provide some scientific criteria to the similar companies, and help the companies to take measures to keep away from these dangers, and reduce the casualty and loss in the end.

Abstract: This fundamental work deals with the biosorption removal of Co(II) using a Mycobacterium phlei strain. Several variables that have an effect on the capacity of cobalt biosorption from aqueous solution by Mycobacterium phlei were studied. particularly the effects of solution pH, initial Co(II) concentration, contact time and biomass dose. The experimental data were modeled by Langmuir and Freundlich isotherm models. Langmuir model resulted in the best fit of the adsorption data. The maximum adsorption capacity for Co(II) was 68.22 mg/g. The best correlation was provided by the second-order kinetic model, implying that chemical sorption was the rate-limiting step. The practical implication of this study is the development of an effective and economic technology for Co(II) removal from wastewaters.