Study on teaching effects by using markov model
zhu yu-xin~1; zhang jin-zong~1; zhu yu-li~2 (1. college of environmental and planning of liaocheng university; liaocheng 252059; china; 2. no. 1 middle school of shenxian county of shandong; shenxian county 252400; china)
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..............page:98-101
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Influence of structure parameters of doubly clad single-mode fibers on propagation characteristics
hou shang-lin~1; lu heng-wei~2; qi xiao-qiong~3; hu chun-lian~4 (1. school of science; lanzhou university of technology; lanzhou 730050; china; 2. school of electric and electronic engineering; shandong university of technology; zibo 255049; china; 3.school of information science and engineering; lanzhou university; lanzhou 730000; china; 4. alloy powder works; lanzhou university of technology; lanzhou 730050; china)
..............page:37-43
..............page:107-110
Germplasm resources and protection
zhang lu-qiang; chen zhi-wei jia cheng-you; zhang jian-yong; chen yan-zhen(school of life science; shandong university of technology; zibo 255049; china)
..............page:21-27