Advanced Materials Research Vol. 461

Abstract: This article engages in a survey on the countryside’s building materials in Zhejiang province, and indicates problems in the new countryside construction during the early 1990s to 2005: on one side, rarely few new materials for energy-conservation is being used; on the other side, traditional materials of local characteristics are abandoned. Therefore, this article indicates a range of materials which make improvement or innovation on traditional ones for the characteristic of Zhejiang rural areas. Then comparison is made between clay brick and these ecological materials. As a result, this guides villagers to improve the indoor thermal comfort and to promote rural economic development without large investment.

Abstract: The wide application of information technology has greatly improve the work efficiency but also caused a large and complex data accumulation. How to get the valuable information from vast amounts of data are the key issues in data processing. This paper studied the application of data mining technology in tobacco commercial enterprise from three aspects: market demand forecasting, customer relationship management and historical data processing. Analysis of how to use data mining technology to make full use of large amounts of data to provide a basis for tobacco commercial enterprise’s decision-making.

Abstract: The heat-transfer tubes and tube-sheets are the most complicated pressure parts in PWR steam generator. For analyzing the stress of heat-transfer tubes and tube-sheets, the geometry model of heat-transfer tubes and tube-sheet was constructed. The finite element grids were generated by ANSYS. According to operating temperature, the temperature field and temperature stress were calculated with ANSYS. The results show that the maximum stress is located on the inner wall of juncture of heat-transfer tubes and tube-sheet. According to the operating conditions of heat-transfer tubes and tube-sheet, the operating stress was calculated with ANSYS. The results show that stress changes on the juncture of heat-transfer tubes and tube-sheet.

Abstract: The paper researched on the strain, the deformation and the failure mode of hollow latticed steel columns through two experimental conditions. They were respectively about the vertical load and the horizontal load. The results showed that for the hollow latticed steel columns with upper columns, because of the stiffness of upper columns was obviously higher than the lower ones’, the upper columns were destroyed earliest under the vertical load. In addition, the columns had good horizontal bearing and deformation capacity, and the gravity second-order effects were not obvious for the columns.

Abstract: Fiber reinforced plastic (FRP) pipeline has better anti-corrosion and anti-scaling performances than traditional steel pipeline. It has been widely used in the areas of liquid transmission. In view of the water hammer phenomenon in liquid pipeline with entrapped gas, water hammer analysis model for the FRP pipeline is built. The solve methods are discussed based on homogeneous flow model and method of characteristic (MOC). A computer program is developed to research the pressures response. Ultimately, this paper simulates the water hammer pressures response on the conditions which include different initial void fraction in liquid, a constant liquid level at upstream end and sudden closure of valve at downstream end of pipeline. The study results are benefit to guide safe operation and management of FRP liquid pipeline.

Abstract: Based on Fermat’s principle, a new intelligent algorithm named light ray optimization was proposed for solving nonlinear optimization problems. The algorithm has the advantages of simple structure, few tuning parameters, and easily tuning. Compared with the other intelligent optimization algorithms, it has the strong ability to search globally, but poor local search ability. To solve this problem, simulated annealing strategy was introduced to light ray optimization, and a new hybrid optimization algorithm was put forward. The new hybrid algorithm enhances the ability of local searching of light ray optimization in the later searching period. The simulation results indicate that the new algorithm has better convergence probability and speed than light ray optimization, and the searching success rate of it is basically equal to that of simulated annealing algorithm.

Abstract: Relation between AOC concentration and bacterium regrowth in drinking water network was investigated to obtain biostability criteria. Comparably obvious linear relationship was found between the maximum HPC and the maximum content of AOC of the distribution system. By extrapolation of the line，HPC would decline to 0 when AOC was 57µg/L. That result showed that substrates cannot support bacterium growth when AOC was less than 57µg/L. Similar obvious linear relationship was also derived between the maximum AOC content and the maximum AOC consumption (∆AOC) of the distribution system. AOC consumption (∆AOC) would decline to 0 when AOC content was 43.8µg/L. it also showed that bacteria cannot growth and AOC do not be utilized when AOC was less than 43.8µg/L. Some researchers had proposed biostability criterias, i.e. Van der Kooij’s criteria of 10µg/L and LeChevallier’s criteria of 50～100µg/L. We proposed that the biostability criteria under chlorine disinfection was AOC <40µg/L.

Abstract: Fast parallel algorithm for the 2-D discrete Gabor transform (DGT) is presented based on 2-D filterbank. A 2-D analysis filterbank is designed for the 2-D DGT. The parallel channels in the filterbank have a unified structure and can apply the 2-D inverse fast discrete Fourier transform (IFFT) algorithm to reduce the computational load. The computational complexity of each parallel channel is very low and is independent of the oversampling rate. Thus, the proposed parallel algorithm is attractive for real time image processing.

Abstract: Novel and fast algorithm for the multirate and parallel implementation of the 2-D DCT-based real-valued discrete Gabor transform (RDGT) is presented. A 2-D multirate-based analysis filterbank is designed for the 2-D RDGT. Each of the parallel channels in the filterbank has a unified structure and can apply the 2-D fast discrete cosine transform (DCT) algorithm to reduce its computational load. The computational complexity of each parallel channel is very low and is independent of the oversampling rate. All the RDGT coefficients are computed in parallel during the analysis process. Thus, the proposed parallel algorithm is attractive for real time image processing.

Abstract: Chemical forms of phosphorus in source and treated drinking water were studied in this paper. Removal of total phosphorus (TP) and microbially available phosphorus (MAP) by conventional treatment process of drinking water was examined. The results showed that particulate phosphorus constituted of most TP in source water. Content of total soluble phosphate (TSP) was about 30% of TP. Soluble reactive phosphate (SRP) can be measured in a few months during a year and its content was very low. Content of MAP was higher than content of TSP in source water, which showed that microbe can also use particle phosphorus. Ratio of TSP to TP increased evidently in treated water. This demonstrated that removal of TSP was more difficult than particulate phosphorus in conventional treatment process for drinking water. Removal of TP and MAP in conventional treatment process of drinking water was effective, with averaged removal efficiency of 66% and 69%, respectively. Coagulation-sedimentation and filtration removed TP efficiently. Enhanced coagulation may increases removal efficiency of MAP. Lower content of MAP can control biostability of drinking water.