Search

Thehigh-frequency angular micro-vibration on satellite platform results in theoptical axis pointing decreasing accuracy. The Kalman filtering based on attitudeinformation fusion method is presented to solve this case and improve the pointing accuracy of attitude determination. Thesimulation results indicate that the estimated accuracy of Kalman filteringattitude information fusion method is better than the result only fromconventional low frequency sensor. Accordingly, the attitude information fusionmethod is verified and accuracy.

In analytical chemistry, particle diameter is very important during the sample preparation. A model is presented describing the effects of particle diameter on the content of analyte determines the size of the particle; and the particle size determines the weight of samples and relative standard deviation in the results. This new methodology for the optimisation of physical sample preparation is applied for the first time. Based on this relationship, we can find an extensive application in analytical chemistry.

The local self-similarity descriptor is a kind of important image or video local feature description method. It is often used for detection, identification and recognition. In this paper we propose a new local self-similarity descriptor based on structural similarity (SSIM) index. It is showed in this paper that the SSIM Index give very different answers to the question of how self-similar local patches really are. For a given image we compute SSIM index distances between representations for all pairs of spatial-patches and store the results in a Self-Similarity Matrix (SSM) defined as the local feature descriptor. This new method is easily extended to the wavelet representation of images. Comparative evaluation of local feature descriptor with previous methods demonstrates improved performance.

The reconstruction and reutilization of the deserted industrial zone is a good way to review industrial economy and sustain the city context. In Xian, the culture center in the world, many textile factories were built around liberation and now there remains a lot of modern industrial heritage. Taking the environment renewal of Dahua Cotton Mill in Xian as the case, the thesis analyses its course of history, value and significance as well as the current situation, explores the way of reconstruction and reutilization of the deserted industrial zone. It argues that the reconstruction and reutilization of the deserted industrial zone can solve the environmental and social problem resulted from its function decline and continue city context.

The casting and solidification process of the bimetallic composite pipe were simulated by ProCAST software aiming at the misrun defect in the pipe. The causes of defect were analyzed from the factors of the pouring temperature, pouring time, preheating temperature of mold and the height of sprue. Reasonable improvements were presented based on the simulation results. Industrial tests showed that misrun defect disappeared after the process was improved, which in turn verified the effectiveness and reliability of simulation results.

Informatization of food safety supervision overviews in China and some other countries were studied. With the combination of food safety supervision characteristics in Guizhou and quality system requirements for national food inspection laboratory, information management system for food safety in Guizhou was proposed. A knowledge database for categorizing determination factors of food hazard was established. This system was implemented in the food safety supervision of circulation links in Guizhou for 3 years (2009-2011). It solved problems such as quality control for massive sampling inspections and data analysis. Besides improving work efficiency, it provided scientific basis for decision making of food safety supervision to government as well as data support for food safety forecasting and warning system.

The spheroidization of the carbide of hot-deformed GCr15 bearing steel was investigated in cyclic annealing process. The results show that most of carbide particles become gradually smaller and more dispersed with the increase of process cycle, however, part of them start to grow for the four cycles, the growth agrees well with Ostwald Ripening Law, and it is not suitable for the further process.

Cementite spheroidization of GCr15 bearing steel includes granulating and growth of cementite. The effects of divorced eutectoid transformation (DET) temperatures on growth of cementite were studied. It was found that the particles of cementite are fine and uniform when DET occurs at 690～720°С, and alloy elements mostly precipitate at different temperatures during cementite growth of GCr15 bearing steel; Cr and Si mostly precipitate in the eutectoid temperature upper limit, while Mn is in the eutectoid temperature lower limit.