Applied Mechanics and Materials Vols. 513-517

Abstract: The channel whose impulse response contains a large number of zero taps is sparse. Exploiting the sparsity of the channel, the estimation problem can be converted into an on-off keying (OOK) detection problem. Therefore, a sparse channel estimation algorithm was proposed. First, with an initial estimate, posed a detection problem by casting the determination of non-zero taps into an OOK communication problem; then took precise evaluation against the established non-zero taps position. In the simulation, the proposed algorithm was compared to the standard LSE via simulations in terms of MSE and BER. The results show that, the proposed algorithm can provide the best performance while maintaining moderate complexity.

Abstract: After surveying and analyzing a lot of green building cases, we put forward green building modular system. According to the system elements which are structure types, building types, building palisade structure system, renewable energy type, renewable energy rate energy saving rate, and capital contribution rate, we divide the system into18 green building modules. And this article pay attention to the system, construction principles, system elements purposes and system composition. we also can use this system to design green buildings with menu type which cannot only reduce the repeat design work, but also help owner learn the property of economy and technology in advance to facilitate and adjustment scheme in time, so that we could reduce the waste of time, money and material. Hence green building modular system is an innovation which is of great importance in green building research.

Abstract: Due to the unique reservoir characteristics of the coalbed methane (CBM) in China, many technical problems have to be studied and solved in the development of horizontal wells for CBM. In this paper, based on the V-type wells, we have summarized the many techniques involved in Drilling and completion of horizontal well for CBM in Binchang mining area, such as leakage protection and sealing, geosteering while drilling, remote connection, variable density cementing, Coal seam cavitation, fiberglass casing running into the well, and etc. It is pointed out that the air foam under-balance drilling will be the development direction for coalbed methane drilling technology.

Abstract: Calculating the stress field distribution of the different working conditions which are the heating, heat preservation, forced cooling and so on, analyzing the impact of the quenching time on stress field, the result of calculation is more close to 3 d work piece quenching process. The result of the experiment and calculation results are analyzed and compared. Simulation results are in good agreement with the test result, spray quenching wind produces the smaller residual thermal stress and avoid the deformation and cracking of heavy rail. Provide the basis for setting reasonable heavy rail quenching process for the actual production.

Abstract: This paper studies a job shop scheduling problem on a single machine environment with an objective of minimizing the total weighed earliness and tardiness penalties. Jobs have distinct release dates and distinct due dates. A sequence-dependent setup times exists between two consecutive jobs. Jobs are punished if they are finished either before due dates or after due dates. A chemical reaction optimization method is proposed to solve the problem. An improved optimal timing is applied to fix the start time of each job under given sequence. Experimental results show that the proposed algorithm can solve this problem effectively.

Abstract: Bending of a prestressing tendon by construction error or the radius of curvature at the continuous joint of PSC girders cannot be avoided. However, this kind of prestress loss is not considered in design and construction processes. This study proves that prestress loss occurs at the continuous joint due to local bending of the tendon which is induced by construction error or the radius of curvature. The result shows that a maximum 3 % of prestress loss occurs at the continuous joint for a single tendon.

Abstract: The weak formulation of the Lagrangian control equations considering the contact constraint conditions and the FEM discrete equations have been derived. The non-linear and non-smooth problems of the mechanical response are solved perfectly by adopting the suggestion method for which tolerance large tangential slipping of the contact surface. One excavation bedding rock slope of the Hu-Rong-Xi expressway is analyzed applying the method mentioned above. The distribution rules of the displacement, stress, strain, contact state, contact friction force and sliding distance under the status of critical sliding are obtained. The analysis results indicate that the failure of the bedding slope is a progressive course. The interlayer stagger firstly, then the deformation evaluates to creep bedding slip and the bottom rock occurs buckling slip at last. The destruction model changes form the bedding slide to rock buckling slip.

Abstract: In order to develop marginal oil reservoir and save drilling cost,since 2006 Shengli Oilfield began to do research of slim hole drilling technology. After a summary trial of 13 wells in Shengtuo area, Analysis the existence of technical difficulties and solutions of slimhole. Preliminary formed a set of suitable technology for Shengli oil field, especially the slim hole drilling in Shengtuo area, The average penetration rate reached 18.39m/h, The average drilling period is 10.69d. The experience provides reference to the same kind of wells in shengli oilfield.

Abstract: Based on the well-studied bearing equations of large steel structure bridge, this paper calculates the relationship between quality parameter matrix of the bridge and damping parameter, infers changing trends of stiffness bearing deformation matrix over time, and sets the effective threshold to alarm dangerous conditions in deformation. The paper summarizes the natural frequency of different forms of the bridge, and calculates the frame deformation situation caused by horizontal alternating force under high pressure.

Abstract: In this work, a new charge-coupling structure of RSO MOSFET with slope field plate is proposed. The design method is developed by theoretical analysis. In addition, a fabrication method using multi-plate to fit slope method is introduced. Then, a 250V structure was simulated to verify the theoretical analysis by TCAD. It is demonstrated that the structure overcomes the non-uniformity of electric field in drift region in traditional RSO MOSFET. The trade-off between the Ron and BV— “silicon limit” has been broken, for the Rdson=116 mΩ/mm² in this structure.