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Materials and methods l General framework The overall of the PRDL structure include two networks, two nodes, and ten systems, the two networks are the government network and Internet, the two nodes are municipal core nodes in Beijing Academy of agriculture and forestry Sciences and branch nodes in 13 Region districts of Beijing, and the ten system are satellite receiving system, local resource production system, program format conversion system, program testing system, multimedia asset management system, program distribution system, broadcast management system, learning management system, information management system, teaching websites.
Summary PRDL have the function of education, modern agricultural science and technology promotion, information dissemination, consultation and Q & A, which is promoted and applied in Beijing 183 towns and 3,955 villages, the number of registered users are exceeded 2 million.
It has greatly enriched the basic science and technology promotion, rural training, agricultural technology services.
The PRDL has speeded rural technologies in rural areas more than 1000 providing a strong support for the promotion of advanced agricultural science and technology achievements, and enhance the level of development of rural information.
Do, A peer-to-peer architecture for media streaming, in: IEEE Journal on Selected Areas in Communications 22 (1) (2004) 121–133

Estrin, Martensitic Transformations, Cambridge International Science Publishing, 2014
Aref'Eva, Martensite Nucleation under conditions of austenite superplasticity and external magnetic field, IOP Conference Series: Materials Science and Engineering. 969 (2020) 012009
Petrov, Fine structure of martensite in carbon steels, Metal Science and Heat Treatment. 9 (1967) 586-590
Petrov, Fine structure of martensite in carbon steels, Metal Science and Heat Treatment. 9 (1967) 586-590
Venables, The martensite transformation in stainless steel, The Philosophical Magazine: A Journal of Theoretical Experimental and Applied Physics. 7 (1962) 35-44

However, when complex surface is machined, constant feed-rate will bring about fluctuation of material removal rate and overload of machine tools or break of cutter, so machining efficiency and quality are degraded.
Zhou et.al [2] adjusted feed-rate by using cutting simulation system and machine tool characters so that constant material removal rate was obtained and feed-rate was optimized.
(d), tool paths are generated by CL method, machining material is Al metal, and the machining time before and after optimization are 4 minutes and 48 seconds, 4 minutes and 19 seconds, respectively, so the machining efficiency is improved by about 10.1%.In Fig.4(e), tool paths are generated by CS method, machining material is zirconia, and the machining time before and after optimization are 3 minutes and 30 seconds , 3 minutes and 17 seconds, respectively, so the machining efficiency is improved by about 6.2%.Compared with CL method, which feed-rates are not optimized, the machining efficiency of CS method with feed-rates optimization is improved about 31.6%.In the whole machining process, cutting status is stable and vibration of machine tool is low.
Acknowledgements This work was financially supported by the Jiangsu College Natural Science Foundation of Jiangsu Province Education Committee (08KJD460005).
Park: Computer-Aided Design Vol. 36(2004), p.279-288 [6] Xiaobing Chen, Wenhe Liao, Haibing Wu: Journal of Computer-Aided Design & Computer Graphics Vol. 21(2009), p.1800-1804.In Chinese.

Introduction The refinement of solidification structure has been an important guideline to improve mechanical properties of materials [1, 2].
Acknowledgements This research was supported by the National Natural Science Foundation of China under the Grant No.50874093 and No. 51054007.
Materials Characterization, 59 (2008) 283-289
Journal of Iron and Steel Research, 16 (2009) 7-12

This system can make teachers and students access distributed database to learn experience in teaching and query material, etc. from any region through the network.
As the application discipline, it not only introduces latest research achievements of foundation subject, but also fully reflects new technology and new technical renovation as well as great influence of industrial structure transformation from engineering science.
Due to teaching program, and teaching equipment, and teaching material and other problems, the course teaching of engineering management specialty still utilizes traditional teaching method at present.
Using rich graphics, video, audio, animation and so on material realizes the interaction of knowledge and engineering practice, and stimulates potentiality of "teaching" and "learning".
References [1] Huinan Chen, Roles of Stereoscopic Teaching Material and Web-based Class in Teaching Pattern Reform, Journal of Nanjing University of Posts and Telecommunications, Vol.7, No.4, pp. 12-14, December 2005

Study on Smooth Blasting of Tunnel in Fault Formation Fu Qiang Gao Department of Civil Engineering, Luoyang Institute of Science and Technology, Henan 471023 China Email: fuqianggao@yahoo.cn Keywords: Rock tunnel, Fault formation, Tunnel blasting, Slotted pipe charge, Over-excavation Abstract.
The method of slotted pipe blasting technology has many advantages of charging structure simply, wide range of material source, easy processing, producing simply, and blasting effect prominent, etc.
The slotted pipe adopts ABS plastic commonly, considering the ease of access to materials, reducing test costs, and the promotion of test results, the flame resistance and antistatic “double anti” hard PVC plastic material is adopted to produce slotted pipe.
Yu: Journal of China University and Technology, vol. 5 (1995) No.2 p.69 (In Chinese) [3] Y.B.

LTP, as a physical modification means, stimulates gas into high energy iron which reacts with materials.
Experiments Materials.
Low temperature plasmas processor(YZ-1)supplied from GuoWei advanced science and technology Co.
Journal of Textile Research.vol.2(2004),p.89 [5] Tomiji Wakida, Text.Res.J. vol.8(1993),p.438

People in the observation, the effect is very poor, it is difficult to judge, so this kind of image using linear gray level to realize the exchange. [3] Z’= ZK- Z1/ b- a (Z- a) + Z1 formula 1 Z1 Zk a b Picture 2 Low contrast image histogram Conclusion The segmentation quality is good or bad, directly affect the quality of products and materials.
If the rate of accuracy is not high, long, is caused by too many materials remaining after rolling, if too short is caused by defective quantity increases; for the billet section quality is not high, in the rolling must be cut not neat, thus causing serious waste and too short seconds.
[3] Lu Jianhua, Image Pprocessing and Analysis [M], Beijing: Science Press, 1992, 41-47
Pahlavan, Modeling the Effect of Human Body on TOA Based Indoor Human Tracking[J], International Journal of Wireless Information Networks 20(4), 306-317 [5] Y.

(2) In order to verify the effectiveness and the reliability of the system, lead-free perovskite structure BZT base ceramics materials are prepared in this paper, and the use of VB programming technology and image reconstruction technology carries out the repair process for the artistic image that is obtained by the electron microscope and digital camera
Materials science and engineering, 2011, 25(3): 486-488
Journal of measurement, 2011, 32(8): 766-771.

Experimental determination of the coefficient of friction in rotational sliding joint Rastislav Ďuriš1,a, Eva Labašová1 1Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology, Department of Applied Mechanics, Paulinska 16, 917 24 Trnava, Slovak Republic arastislav.duris@stuba.sk Keywords: Rotational sliding joint, Coeficient of friction, Boaring bushings, Roughnes Abstract.
Steel STN 12 060 (EN ISO C55E, W.Nr. 1.1203) is material if internal bushing.
Results of tests show wearing of the material.
American International Journal of Contemporary Research, Vol. 2 No. 8; (August 2012), ISSN 2162-139X (Print), ISSN 2162-142X (Online), p.304-309 [4] I.