Key Engineering Materials Vols. 480-481

Abstract: In ultra-precision cutting, grinding and special processing, it is difficult to resolve the conflict between the large stroke and high-precision feed, which is also a headache for multi-axis ultra-precision machining. In order to construct a low-speed micro-electron discharge machining system adaptable to a wide range of micro-methods and driven by ultrasonic motors (USM), the program attempts to design the base platform for precision Motion Platform. By analyzing the dynamic and the static properties for the platform with ANSYS software and comparing the designs of platforms, the design of the base motion platform has been completed. After testing the performance of the platform, the design has met the requirements. The research can be treated as a universal solution in the design of the base platform for high-precise motion areas.

Abstract: With the popularization of the Internet and the development of E-commerce, the information on the Networks has increased greatly and the E-Commerce system’s structure becomes more complicated when it provides more and more choices for users. People all have experienced the feeling of being overwhelmed by the number of new books, articles, and movies coming out each year. Many researchers pay more attention on building a proper tool which can help users obtain personalized resources. Personalized recommender systems are one such software tool in which information retrieve, information filtering, and content-based filtering techniques are used to help users obtain recommendations for unseen items based on their preferences. In this paper, described item models in content-based filtering recommender systems in order to alleviate the information overload issues. The paper presented three item models as following: vector space model representation, probability model representation and improved probabilistic model representation. These item models have their own advantages and disadvantages, and can choose according to specific circumstances.

Abstract: This paper research the hydraulic control system of pipe storage and handling system. The pipe storage and handling system (PSHS) is the key parts on rig to handle the drilling pipe and it can improve the efficiency during the drilling works. The hydraulic system of pipe storage and handling system have designed according to automatic round-trip operation in drilling engineering. The mathematical modeling of hydraulic components in PSHS have established and analyzed. The simulation model of hydraulic system of PSHS is also built and simulated to analysis the characteristics of reversal valve operation, Hydraulic pressure adjusting operation, piston speed control and state of accumulator based on the AMESim. The results prove that the operations of pipe storage and handle such as pipe storage, pipe clamping, pipe lifting, pipe transfer and pipe joint can be accomplished drive by hydraulic system. Meanwhile, AMESim have great views to research the geosciences equipment.

Abstract: The technology is developing faster and faster, and in the chemical industry, the technology is develop towards larger size, higher precision, automotive, higher pressure, and multi function. However, for the situation that the filter tray used in our county, there is a long distance between our country and the foreigner, this topic makes some research on the problems that occurred during the usage of the filter made in china, on base of which, a better filter is designed, and the new filter achieved good results. This article introduced some key issues during the design of filter.

Abstract: Now, the industries such as chemical industry is develop rapidly, and the requirement for the chrome of O2 is higher and higher. In this situation, it is important to measure the oxygen density with a portable and exact measure device. This article makes some study on a device for measuring the oxygen density, focusing on the principle of the testing, and the hardware and the software of the device. It proved that the system can work well.

Abstract: As regarding silk garment, size is a very important factor in quality control in international trade. Garment size is affected by many factors of which ironing shrinkage is one of the most important. This assay discusses how to control the affect by ironing shrinking to the size of silk garment in international silk garment business.

Abstract: Pipe jacking, for its incomparable technical superiority, has been gaining wider and wider application in municipal construction project. However, there are many difficulties in terms of construction techniques and the long-distance pipe jacking is one of the most complicated. This paper, with the case history of the first and second stage of the sewage disposal project in Chongqing, presented the comparison and selection for the optimal construction scheme of long-distance pipe jacking, the installation techniques of pipe-jacking equipments, pipe-jacking construction method, technical challenges and possible solutions. The result of the study shows that long-distance pipe jacking technique, if carefully designed and combined with information construction, can be widely applied to the construction of municipal infrastructure in China.

Abstract: During the pipe jacking construction, the bearing plates of jack need the support of great reactive force which is provided by the side-wall of the working shaft and the soil mass behind the wall. In the shallow pipe-jacking working shaft, the soil mass only can provide limited reactive force due to the small height of the soil mass behind the side-wall, which becomes the difficult point in the design and construction of the shallow pipe-jacking working shaft. This thesis takes the actual projects for the examples to introduce the construction technology of shallow pipe-jacking working shaft in details, including the construction key points like pre-grouting injection consolidation, ring beam construction method as well as reverse construction method.

Abstract: As a trenchless technology for buried pipeline, pipe-jacking tunnel technology is increasingly displaying the enormous superior in buried pipeline remodeling in city. Combining characteristics of pipe-jacking tunnel, this paper analyzed key-points of construction technology and engineering troubles which occurrence possibly in construction, and introduced some treatment measures. This paper is also sum-up of pipe-jacking construction many years, maybe provide some help for the same kind of construction.

Abstract: Considering the current domestic situation that there is no provision for shallow pipe-jacking (with overburden soil layer not thicker than 3 m and 1.5 times of the pipe external diameter) in the existing water supply and drainage pipeline engineering design and construction specifications, a comprehensive analysis and discussion, based on the actual domestic condition, is made on the feasibility of shallow pipe-jacking technology in urban drainage systems. The problems confronting the shallow pipe-jacking technology theory research are also analyzed and the research status of shallow curve pipe-jacking technology is introduced.