Abstract:Nano-particles as lubricant additives to improve the lubrication properties of grease lubrication is the future of nanotechnology, and it will profoundly influence the future development of the national economy. The changes in performance caused by the nano-features will bring about a qualitative leap to China-made function parts. Nano-particles as additives for greases can be used to optimize the performance of function parts to improve the consistency, durability, reliability. Besides, owing to the low cost, the nano-particle additive technology is suitable for generalization. The use of nano-lubrication technology will make up our deficiencies in precision manufacturing, thus making the large-scale application of nano-lubrication technology possible.

Abstract:Study on the diffusion behavior and characteristics of sulfate in concrete is very important to prevent and reduce damage to the concrete caused by sulfate corrosion. According to Fick Law, Sulfate ion diffusion equation in concrete, considering the chemical function, was established. Based on the theoretical analysis above, the corresponding process was simulated by Fortran language programming. The results show that the sulfate ion concentration in concrete increases with the increase of water-binder ratio and corrosion solution concentration, that it decreases with the increase of maintenance time; that it deereses with the increase of stress ratio when stress ratio is below 0.5, while increases with the increase of stress ratio when stress ratio is above 0.5.

Abstract:Constructed wetland is a kind of ecological restoration engineering technology which is wide-ly used because of its low cost,convenient management and high efficiency.Based on the principle of con-structed wetland mechanism,this paper analyzes the problems in the application of constructed wetlands, discusses some key technical problems needed to be solved and provides some references to the future sci-entific research and engineering application.

Abstract:Taking Ni60A ,TiC ,TiN and Co powder as the raw material ,the Ti(C、N)‐WC particle rein‐forced nickel composite coating was prepared from Q 235 steel plate with the argon‐arc cladding in‐situ syn‐thesis technology .Microstructure ,chemical composition ,hardness changes and tribological characteristics of the coating were studied .The asdeposited microstructure mainly consists of Ni‐rich γ(Ni ,Fe)phase ,Ti (C、N) ,WC ,and(Fe ,Cr)x C .Compared with that of the Q235 steel substrate ,the microhardness and wear resistance of the coating are 6 .5 and 10 times respectively .T he microhardness of composite coating is a de‐clining process from the surface to the center till the heat affected zone .The wear mechanism of Q235 steel is adhesive wear and abrasive wear ,while the wear form of composite coating is abrasive wear caused by debris as the third part .

Abstract:A dual system estimator was established based on capture-recapture model. And a simulation of population estimate was conducted by means of the census and post-enumeration survey system, and census and administrative records system. The results show that estimates of the true population are different according to different system data sources. The article points out the current use of census and administrative records system has its advantages.

Abstract:Some measures were proposed in response to some of the major problems with the current cost management in the whole-course construction,and a special cost management program was provided.It was also pointed out that the strengthening of cost management in the construction stage is a necessary trend of development.

Abstract:The overriding trip accident of high voltage electrical transmission systems in mine is generally caused by some short-circuit faults,which may lead to a wide range of power failure and gas accumulation,threatening the safety of the mine.In this paper,the features of mine grid transmission system were discussed firstly.And then an overriding trip protecting system is designed by deeply investigating on its working principles and characteristics.The system can solve the overriding trip problems effectively and help to ensure the reliability and safety of mine electrical supply system.

Abstract:In order to promote the full implementation of public transport priority development strate‐gy ,make the large capacity backbone role of the urban rail transit and assistance coordinating role of con‐ventional bus transit in to full play ,it is necessary to adjust conventional bus transport to urban rail tran‐sit .Putting the passenger flow changes of the conventional bus transit into consideration ,this paper de‐scribed the optimal adjustment problems on bus transit under the influence of urban rail transit ,established an optimizing model of conventional bus transit network and solved it via genetic algorithm with maximum of non‐stop capacity as its objective function ,the line length ,non‐linear coefficient and public transport net‐work density as its constraints .