Advanced Materials Research Vols. 179-180

Abstract: Of all the real cases of water resources demonstration for construction projects, research on biomass energy cogeneration plant (generating by straw) which uses reclaimed water as its water source is relatively limited, especially the one locating in frigid zone. Even in water resources demonstration specifications, there are still ambiguities in water resources and water environment influencing factors during the demonstration process. Based on a typical example ---Yi’an biomass energy cogeneration plant, from the perspective of water resources, current situation of water resources and feasibility of water used by the plant have been analyzed; while from the perspective of water environment, water quality and water discharging impacts upon other consumers have also been assessed. Above all, strategy and method of water resources demonstration study is explicitly analyzed and summarized in this article, which provide an entire operational system for water resources feasibility study on biomass energy cogeneration plant (especially in frigid zone) and finally will enrich the practical theory and research for water resources feasibility study of construction projects.

Abstract: The novel multipoint forming technology based on Hydro-forming processing was developed, and the drive mode was discussed. Die is replaced by liquid, and punch is formed by adjusting the multipoint fundamental elements. Finally through controlling the fundamental elements, the height of a serial of discrete, regularly-arranged fundamental elements is adjusted, and by using the punch pad, the accuracy of sheet metal surface contour is improved in multipoint forming technology. Then, the hydro-forming set was developed, and experimented. It provides a new efficient dieless forming method for the digital flexible forming of sheet metal.

Abstract: A novel approach to video detection, synchronous detection lines method, is firstly proposed in this paper. It is actually a way to divide the pixel sets of the video images. Then, an algorithm of three-layer probability model based on synchronous detection lines is presented to solve the problems of background updating and target tracking. The results of a practical system show that this approach has better effect to solve the problems of background updating and target tracking.

Abstract: Following an analysis of static performance of the prestressed arch supported by a single / double-layer reticulated shells ,Single/double -layer of shell bearing surface structure of the node center point displacement, upward displacement of the structure, the structure raised some pressure, sunken part of the tension.

Abstract: This paper aimed to investigate the influence of NaCl to water molecular movement. The interpretation is that NaCl could change structure of microscopic capillary in wood and increase energy consumption for water movement in capillary. Crystallized of NaCl in capillary made the pipe diameter diminished, resulted in the reduce of movement velocity for water, at the same time the adsorbed water increased, which leaded to consume more energy to destroy this bond force between adsorbed water and wood or NaCl.

Abstract: The purpose of this paper was to establish norm about the scale of self-concept on junior middle school students in the northwest China region by using the self-concept scale on junior middle school students in the northwest China region. The random samples of 1681 from Shannxi province, Gansu province, Ningxia autonomous region, Xinjiang autonomous region carried out the study. The results of the F test showed that there were significant differences in grade, gender, gender and grade interaction effect on most dimensions of self-concept. The study gave the norm of 10 factors about liberal arts self-concept, science self-concept, arts self-concept, family self-concept, friends self-concept, self-worth, mental and physical self-concept, appearance self-concept, conscience, honesty and second-order factors about academic self-concept, interpersonal self-concept, own self-concept, moral self-concept for the male and female students.

Abstract: In terms of various applications of linear motor, there are different design objectives with varying concerns. In this paper, the objective is to obtain the slot/pole ratio for tubular permanent-magnet linear synchronous motor (TPMLSM). Direct-axis current analysis and finite element technique are utilized to investigate the optimal slot/slot ratio design of the TPMLSM. Based on electrical angle drift of slots between two neighboring permanent magnets, the slot/pole ratio (SPR), one of the key factors in design, is deduced by direct-axis current analysis. In contrast to those experiment methods, the proposed technique is convenient and swift; moreover it is proven that the method is efficient by 2-D axisymmetic finite element analysis.

Abstract: Pd-based composite membranes are the attractive membrane materials for hydrogen separation due to their high hydrogen permeability and infinite permselectivity. Thin pure Ni and Pd-Ni alloy membranes with high hydrogen permeation were prepared by the electroless plating method. It is difficult to prepare the dense pure Ni membranes with 1-2 μm thickness for hydrogen separation. However, Pd-Ni alloy membranes with several micrometers thickness showed good permeation performance. Hydrogen permeance of the Pd95Ni5 alloy membrane with fcc phase up to 3.1×10-6 mol/m2 s Pa and the ideal permselectivity over 600 were obtained at 773 K.

Abstract: Fast measurement of soil properties is of great value for farmland fertilizer management with the purpose of reducing environmental pollution caused by over-fertilizing and improving yield/cost ratio of land. In the study, an optical fiber sensing system was introduced. It consisted of a topsoil opener, a portable spectrophotometer (350-2500nm) and an optical fiber. Prediction models of total nitrogen (N), phosphorous (P), moisture content (MC), pH and organic matter (OM) were created in laboratory and validated by field testing. Soil samples were collected from 30 farmland blocks covering north of Zhejiang Province and south of Jiangsu Province, P.R. China. Partial least squares (PLS) regression with full cross-validation was used for calibration models building. The correlation coefficient of R2 between on-line and laboratory measurements of N, P, MC, pH and OM are 0.92, 0.78, 0.85, 0.83 and 0.76, respectively. The study shows the potential of using the optical fiber soil sensing system for next generation of precision farming.

Abstract: The grid map of woven fabric with curved surface which was drawn by MATLAB software was used to study on the change of fabric shape and structure. By use of this method, the problem of overhead yarns and fabric corrugation can be avoided when the preform is winded or overlaid on the mould. Therefore composites forming process is greatly simplified.