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遗传性大肠癌的诊治进展 被引量:2
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作者 崔龙 《中国医刊》 CAS 2007年第8期11-13,共3页
关键词 遗传性大肠癌 常染色体显性遗传 家族遗传 诊治 肿瘤易患性 遗传背景 垂直遗传 发病年龄
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Neuron PI control for semi-active suspension system of tracked vehicle 被引量:2
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作者 曾谊晖 刘少军 鄂加强 《Journal of Central South University》 SCIE EI CAS 2011年第2期444-450,共7页
A neuron proportion integration (PI) control strategy for semi-active suspension system of tracked vehicle was proposed based on its unique structure and the multiple and complex environment of the driving traffic. An... A neuron proportion integration (PI) control strategy for semi-active suspension system of tracked vehicle was proposed based on its unique structure and the multiple and complex environment of the driving traffic. An adaptive genetic algorithm is used to optimize the parameters of the neuron PI controller. The simulation result of the neuron PI control for semi-active suspension system of tracked vehicle indicates that the vertical amplitude,pitch angle and vertical acceleration of the vehicle are well controlled. The root mean square (RMS) of the vertical amplitude decreases by 37.2%,and 45.2% for the pitch angle,38.6% for the vertical acceleration. The research of neuron PI control experiment for the semi-active suspension system of the tracked vehicle model mining in benthal indicates that the RMS of the weight acceleration vibrating along the vertical direction decreases by 29.5%,the power spectral density resonance peak of the acceleration of the car body decreases by 23.8%. 展开更多
关键词 tracked vehicle magneto rheological damper semi-active suspension preview technology neuron PI control
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家族性Chiari畸形Ⅰ型三例 被引量:1
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作者 张楠 张建 《中华外科杂志》 CAS CSCD 北大核心 2001年第3期194-194,共1页
关键词 家庭性Chiari畸形 分子遗传 连续工代发病 垂直遗传
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VERTICAL HEREDITY VS. HORIZONTAL GENE TRANSFER: A CHALLENGE TO BACTERIAL CLASSIFICATION 被引量:3
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作者 HAO Bailin(Institute of Theoretical Physics, Academy of Chinese Sciences, Beijing 100080, China Senior International Fellow of the Santa Fe Institute T-Life Research Center, Fudan University,Shanghai 200433, China)QI Ji(Institute of Theoretical Physics, Beijing 100080, China) 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2003年第3期307-314,共8页
The diversity and classification of microbes has been a long-standing issue.Molecular phylogeny of the prokaryotes based on comparison of the 16S rRNA sequences of the small ribosomal subunit has led to a reasonable t... The diversity and classification of microbes has been a long-standing issue.Molecular phylogeny of the prokaryotes based on comparison of the 16S rRNA sequences of the small ribosomal subunit has led to a reasonable tree of life in the late 1970s. How-ever, the availability of more and more complete bacterial genomes has brought about complications instead of refinement of the tree. In particular, it turns out that different choice of genes may tell different history. This might be caused by possible horizontal gene transfer (HGT) among species. There is an urgent need to develop phylogenetic methods that make use of whole genome data. We describe a new approach in molecular phylogeny,namely, tree construction based on K-tuple frequency analysis of the genomic sequences.Putting aside the technicalities, we emphasize the transition from randomness to determin-ism when the string length K increases and try to comment on the challenge mentioned in the title. 展开更多
关键词 prokaryote phylogeny horizontal gene transfer FITNESS compositionaldistance
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