Abstract: Empirical analysis on typical product categories, product series and Price Index of every level of single species is made by using classical ARMA models as well as ARCH models, which based on the actual data sampling and network. This study sets up AR models with ARCH effect of timing of product operations Index that judged by LM test used as model identification, and then establishes corresponding mathematical quantitative model for prediction. All of these are carried out by the Metrical Economics and the Eviews software. With time series, the fitting and prediction for running change-trend of silk are also in the theoretic confidence interval, which can also verify the degree of accuracy and precision of the established model.
Abstract: According to the collected data of the market monthly closing price on dry cocoon and raw silk, predictive modeling and analyzing on the price trend of dry cocoon and raw silk are made based on the related theories and test analysis of BP Artificial Neural Network is carried out. Developed corresponding procedure with Neural Network toolbox under the condition of MATLAB, and then set up BP network relevant prediction models, at last, checked up with examples. At the same time, this study set up corresponding time series forecasting models and made empirical analysis on the basis of Eviews software. The results show that, the two methods both fit for short-term prediction, BP network can achieve human coordination control, the better predictive precision, which supplies an analysis way for silk cocoon market, all of that can be referred to in the future.
Abstract: To speed up the research pace of domestic electronic testing for raw silk in China, the hardware and software of single-spindle, the general design programs of multi-spindles, the solutions and theories of the existing domestic and international electronic testing for raw silk were discussed and summarized to form an electronic testing system and develop a software package. The system was supported by development environment of Virtual Instrument, the thread guide bayonet and circuit frequency of SD-1(a kind of raw silk instrument) sensor were improved to make the information of the raw silk size and faults into the computer accurately by DAQ in hardware. As far as software was concerned, a special program was designed based on virtual instrument. Serials of information data（voltage values）of the raw silk size and faults was get by the measurement of several groups of raw silk with this system. The testing results of the raw silk size and faults were acquired by the analysis of the fluctuating information data of the raw silk size.
Abstract: The detection of raw silk defects is important in the quality inspection of raw silk. Electronic inspection is a popular method now for the reasons of high speed and objectivity. However, the traditional seriplane testing method is also applied in many countries for its advantages that the electronic inspection method haven’t. Due to the different evaluation standards, different results will be derived when the same raw silk defect is detected by the two different methods. In this study, various raw silk defects were detected according to the two different methods or standards. The cause of different results derived by different detection method was analyzed through observing the actual shape of the raw silk defects under the microscope. This is favorable to the development of electronic inspection method and standards for the raw silk defects.
Abstract: Because of the seldom research on temperature and humidity measurement of gas with high temperature and high humidity, workers in steaming workshops judge the temperature and humidity of steam in steamers on their subjective experience, which limits the accurate control of temperature and humidity of steam in steaming boxes. In reaction to the difficult measurement of high temperature and high humidity gas, a kind of electronic device has been developed to solve the problem. Through ingenious design of programming in assembly language and of electronic circuit, the device can automatically start an on chip heating element to prevent steam from condensing, and display the high temperature and relative humidity of steam in steamers. It will be propitious to break through the shackles of subjective experience, realize small changes in the temperature and humidity of steam in steaming boxes, and provide a basis and premise for controlling and regulating the temperature and humidity of steam. In addition, it will play an important role in gearing down the hygroscopic agent dosage, reducing the production cost, conserving energy, protecting environment and improving the quality of steaming.
Abstract: Based on the sampling and grading theory of raw silk test, this paper studied the grading theory method of thick and thin defects of the raw silk in the electronic testing. By means of analyzing the data obtained from the raw silk electronic detector, the fact that the thick and thin defects of the raw silk appropriately take negative binomial distribution in the electronic testing has been confirmed. Under such circumstance, the distribution of the average of the sampling samples of the thick and thin defects was given, and fitting on the relationship between the mean and variance of the thick and thin defects were carried out by introducing Taylor’s power law equation, thus the right grading rate and probability of the difference between two spot tests about the thick and thin defects of the raw silk in the electronic testing was deduced. Moreover, the conclusion of the theoretical analysis was confirmed by simulation tests. The results might provide a basis for establishing the grading standards of the thick and thin defects in the electronic testing for raw silk.
Abstract: A variety of stress cracks appear in the garment seam, which affects the appearance and the seam strength. In this paper, the indicating methods of seam cracks were presented by identification and analysis of a variety of seam cracks on woven garments. The regression equation of seam crack recognizable rate was listed through different kinds of seam cracks observed and distinguished by inspectors. The influence on crack recognizable rate by the size and the colour of the crack was also analyzed in this paper. The objective assessment of fracture strength was made by testing the fracture strengths of five kinds of fabrics in warp, weft and 45 ° oblique direction using self-made needle crack testing device. This paper has certain significance for fabric designing and clothing production technology.
Abstract: Based on analyzing the theory of microstrip patch antenna, the article simulates the specification of the antenna in the frequency of 1.575 GHz. The flexible textile antenna has been designed by structure design of three dimensional woven fabrics and manufactured on the ASL2300 rapier sample loom, with conductive fiber and polyester filament as materials. After testing by the Agilent 80533D Network Analyzer, the characteristic parameters have been discussed, such as the Return Loss, Voltage Standing-Wave Ratio, Band Width and so on. The results show that the antenna has good reflection properties of electromagnetic and can be used in microwave transmission.
Abstract: With people's increasing awareness of safety and health, the demands of protective clothing for electromagnetic radiation are gradually increased. The influences of clothing structural factors on protective performance for electromagnetic radiation are studied in this paper. The shielding effectiveness (SE) of fabrics has been tested according to the SJ20524-1995 standard. Meanwhile, according to the measured conditions of fabrics, a simulation model of testing fabric is established by the three-dimensional electromagnetic simulation software Ansoft HFSS to simulate the influences of clothing structural factors on the electromagnetic protective performance under the irradiation of electromagnetic waves at different frequencies. The impact of the length of clothing seams, the size and shape of clothing openings, and the change of clothing layers on the electromagnetic protective performance have been simulated and analyzed in detail. The results show that the simulation results are basically identical with the actual measurement results, and the model of testing fabrics can be applied for the researches on the protective performance for electromagnetic radiation. The study also shows that both seams and openings of clothing will reduce the shielding ability of clothing to electromagnetic radiation, and the change of clothing layers also affects the electromagnetic protective performance of clothing greatly. The results of this article can provide references for the design of electromagnetic shielding clothing, and effectively reduce the adverse effects of clothing structural factors on the protective performance of clothing.
Abstract: Traditional seriplane testing method has been used to detect the evenness and defects of raw silk for a long time, the results of which are affected subjectively by the examiner to a certain extent and are controversial. In this paper, improved based on SD-1 size tester of raw silk, built-in FPGA chip and 9004 real-time controller and winding machine are used to develop a fast real-time inspecting system for evenness, cleanness and neatness of raw silk. This can resolve the problems of the independent intellectual property rights of sensors and process software troubling electronic inspection of raw silk, and realize the conversion, acquisition, real-time differentiation, results display and storage of continuous dynamic voltage signal of raw silk. Compared with the same type device, this system has a higher processing efficiency and better results objectivity.