Advanced Materials Research Vols. 308-310

Abstract: Virgin coconut oil (VCO) microencapsulation technology was developed by spray drying method and the technology was optimized by response surface methodology. Soybean protein isolates (SPI) and maltodextrin were used as wall materials, sucrose esters (SE) and glycerin monostearate (GMS) were used as emulsifiers. Plackett-Burman(PB) design and Box-Behnken (BB) design were applied to screen and optimize influential factors in the process of microencapsulaiton effcency(MEE). The PB design and statistic analysis showed that homogenization pressure, emulsifying time and inlet air temperature were three key factors in this process. Other factors were identified that the total solids concentration was 25%, the ratio of wall materials and core materials was 1:3, the ratio of maltodextrin and SPI was 1:1, the dosage of sucrose esters was 0.5%, and the emulsifying temperature was 40 °C. The quadratic model for three significant factors was established with the MEE as the target response by BB design and response surface analysis. The optimum conditions were as follows: emulsifying time was 60min, homogenization pressure was 40MPa and the inlet air temperature was 177°C. The MEE of microencapsulaiton virgin coconut oil (MEVCO) can reached 65.89% under the optimal conditions．

Abstract: The study carries out optimal design for the cam profile of the valve train in a high-specific-power diesel engine. The dynamic analysis on the original cam reveals that the original one, which leads to adequate fullness coefficient, is designed far from the material margins. The fullness coefficient and time area value are selected as the optimization objective, and the piecewise fucntion method is utilized to optimally design the cam profile. The restrictive contidons are applied to each section on the cam. Thus the function and the optimal coeficients are obtained. Then the dynamic analysis and working process simulation on the optimal valve train are carried out, and it proves that the dynamic and intake port performaces of the optimized one are greatly impoved.

Abstract: In an investigation to gain a deeper understanding of the relationship between port geometry and performance characteristics, a parametic intake port design tool has been developed using statistical design-of-experiment (DOE) techniques. Flow coefficient is a very important parameter, constraints are used to represent additional features in the external packaging requirements. A thorough assessment of performance was made possible by using rapid-prototype models and numerical simulation and the intake port steady flow. The in-cylinder flows were successfully validated by comparing predicted results with new test data. By analyzing the DoE data a design method was developed and used to predict optimum design configurations for a range of common diesel engine applications.

Abstract: Reinforced soil has been among the most effective soil modification materials. Its use has been expanded rapidly into civil engineering, geotechnical engineering and pavement engineering. Reinforcing subgarde in pavement systems has always been an issue. This study focuses on effect of fiber inclusion on the strength of subgrade material. Plastic fiber was used for this investigation. Fiber contents and aspect ratio have been changed during these tests. The fiber percentage varied from 0 % (for unreinforced samples) to 2%. Clay was used as sub grade material. Unconfined compression tests were carried out to investigate behaviour of the composite under different condition. The fiber length and fiber content found to play important rule on the strength of composite. Furthermore it was observed that ductility of sample increased by fiber inclusion.

Abstract: Composite soils have been widely used in civil engineering applications, especially in slopes, embankment dam and landfills. This paper aims to investigate effect of fiber inclusion on compaction characteristic of composite soil (i.e. clay composite). A series of laboratory tests carried out to evaluate fiber effect on optimum water content and maximum dry unit weight of composite soils. Clay was selected as soil part of the composite and natural fiber was used as reinforcement. The fiber parameters differed from one test to another, as fiber length varied from 10 mm to 25mm and fiber content were selected as 0.1% and 0.3%. For each test, compaction curved derived and the results were compared. The results proved that inclusion of fiber affected compaction behaviour of samples so that increasing in fiber content and length caused increasing in Optimum Moisture Content (OMC) and slightly decreased maximum dry unit weight.

Abstract: Contour matching is one of the important problems concerned in 3-D reconstruction field. According to the difficulties of defect contour matching in defect modeling, a method based on similarity measure is presented in this paper. In this method, the theory of similarity measure is introduced to quantitatively describe the similarity of two contours. And the value of similarity measure is set as the criterion to judge matching relation between two contours in consecutive slices. For reducing computational complexity and improving accuracy of contours matching, a candidate matching field of contour is proposed. The efficiency of this algorithm has been verified by a typical example and satisfying results have been obtained.

Abstract: To investigate the chemical constituents from the Plumbago zeylanica L. the chemical constituents were isolated by various column chromatographic methods and their structures were elucidated as plumbazeylanone(1),plumbagic acid(2),β-sitosterol(3),lupeol(4),lup-20(29)-en-3,21-dione(5),norcanelilline(6),3-O-glucopyranosyl plumbagicacid methylester(7),uridine(8),daucosterol(9).Compound 4-6 and 8 were first time were isolated from this plant for the first time.

Abstract: The edge shape of milling insert has important influence on the heat loading and mechanical loading during metal cutting. The optimization of edge-shape parameter for curve-edge milling insert based on evaluation criteria of thermal-mechanic coupling field was carried out in order to improve the thermal-mechanic coupling field and to raise lifetime and production rate of milling insert. A new edge shape function was obtained. The curve-edge milling insert was designed driven by the edge function. The coupling field of milling insert has obvious improvement by finite element analysis (FEM). The maximal equivalent stress and displacement in cutting deformation area decreased by 17.2% and 15.7% respectively.

Abstract: The Apriori algorithm needs to continue scanning the database and may provide mass candidate itemsets in fault diagnosis process which causes the mining speed too slow and the computer memory too large. According to these weaknesses this paper presents the bitmap-base association rule optimization algorithm (BARO). The BARO improves the data structure to reduce the scanning frequency of database and compresses the matrix to reduce the quantity of candidate itemsets in order to improve the speed of equipment fault diagnosis. It proves that BARO is superior to Apriori algorithm in equipment fault diagnosis of efficiency and mining speed by a concrete example.

Abstract: A vehicle active suspension model with 1 / 2 ，four-degrees of freedom is established and by combining genetic algorithm with optimal control theory，the author presents a new control method of active suspension that is to optimize the value of K controlled by LQG in default of road input based on genetic algorithm and makes a simulation in the environment of Matlab / Simulink. By simulation and analysis，the result indicates that，this method has an obvious effect on improving comprehensive performance of vehicles，such as ride comfort and operate stability and so on.