This paper mainly introduces some important technology and standards,basic working principles and methods of compressde coding about digital TV source coding of digital compression equipment on broadcasting & TV ground satellite station,also the formation of MPEG-2 bit stream is presented.
Through comparison of various compression equipment, the author believes that the design thought of bi-direction hydraulic compression of the HPB-1 BBP made by Henan Agricultural University is feasible.
To determine the structural parameters and optimize the design of compression equipment, the law of compression process, the relationship among main parameters in the whole compression process and the characteristerics of the material to be compressed are investigated.
The designment of the hardware and software is presented in detail. Using this technology,the compressing equipment is capable of real-time transmission of 640*480 pixels,(110 Hz) camera images through a 1.5 Mb/s channel,with a compressibility no less than 160∶1.
The paper studies the stress relaxation property of hay by experiment,calculation and analysis. Some of the rheological parameters and equations are obtained. It is important for developing the compression theory and equipment design to improve the quality of bale.
Through the exploration on maintenance practices of TYWK hump signal electrical control system operating at the hump yard of Qinhuangdao South station, we analyzed the reasons of equipment failures and take specific measures to reduce the delays due to equipment failure.
For NG, pipeline storage is economical only when used to cover for short compression equipment outages.
Gas refrigeration cycle systems usually have lower COP values than comparably sized vapor compression equipment.
If the hourly start-stop cycling is reduced by two-thirds, the coefficient of performance of vapor compression equipment is raised an estimated 10%.
This process may use vapor compression equipment to provide the final stage of cooling.
The paper introduces the principle and methods of the digital separation of Y and C signals for PAL composite television signal. The analyses of these methods and the comparison between them are made. The methods are used in 34Mb/s digital television code compression equipment.
The stress relaxation property of hay has quite effects to compressing process and compressing equipment for hay. The paper studies the stress relaxation property of hay by experiment,calculation and analysis.Some of the rheological parameters and equations are obtained. It is important for developing the compression theory and equipment design to improve the quality of bale.
To make full use of the press,this paper summaries six methods and measures of effecive and reasonable use of the press through actual practise,and the result of ment of capital and the cost of the product as well