[Objective] The aim was to explore the phylogenetic relationships of Cara- gana （Fabaceae） by the use of nrlTS sequences. [Method] Internal transcribed spac- er （ITS） sequences of nuclear ribosomal DNA （nrDNA） f...[Objective] The aim was to explore the phylogenetic relationships of Cara- gana （Fabaceae） by the use of nrlTS sequences. [Method] Internal transcribed spac- er （ITS） sequences of nuclear ribosomal DNA （nrDNA） from 29 taxa of Caragana species and seven close relatives （all belong to Astralinae （Adens） Benth） were used for phylogenetic analysis. [Result] Length of the entire ITS region ranges from 611 to 614 bp in Caragana species. The aligned sequences nrlTS of Caragana are 655 bp, and 170 sites are variable, with 107 phylogenetically informative sites. The phylogenetically informative sites are 16.3% of the total aligned sequences. The ITS sequences data are useful to resolve some relationships at lower taxonomic levels within Caragana. The Caragana Fabr. is not a monophyletic group with very close connection with Calophaca tianschanica. The ITS data revealed that the species of Sect. tragacanthoides were dispersed in MP tree or ME tree. Although the morphol- ogy of C. ordosica is similar to C. tibetica, the ITS results revealed an unexpectedly close relativeship to C. roborovskyi. The ITS data also indicate C. davazamcii, C. korshinskii, C. intermedia, and C. microphylla are different species. [Conclusion] ITS sequences have an important reference value in exploring the relationships of Cara- gana.展开更多
Two innovative techniques for manufacturing 0.1 micron MOSFETs are described. On e is SiO2-resist overetching method, in which an additional SiO2 layer is use d to short the gate length; the other is dual-exposure met...Two innovative techniques for manufacturing 0.1 micron MOSFETs are described. On e is SiO2-resist overetching method, in which an additional SiO2 layer is use d to short the gate length; the other is dual-exposure method, according to w hich two overlapped masks are exposed in a single lithography. Both of them are easy to implement,without any special processing technologies required.The layou t used in a real process is introduced. As a result, MOSFETs with minimal channe l length of 0.12 micron are obtained. Also, the test results on characteristic a re given. Finally, a conclusion is drawn that in 0.1 micron scale, both saturation currents and transconductorance of MOSFETs increase, while substrate currents de crease when channel length diminish.展开更多
With the support by the National Natural Science Foundation of China and the Key Research Program of Chinese Academy of Sciences,Prof.Zhou Feng’s research group at Lanzhou Institute of Chemical Physics,Chinese Academ...With the support by the National Natural Science Foundation of China and the Key Research Program of Chinese Academy of Sciences,Prof.Zhou Feng’s research group at Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,reported a caterpillar-inspired self-walking actuator in Small(2015,11(28):3494—3501).展开更多
The aluminum and aluminum product process- ing industry in China is currently experiencing the 3rd high tide of high speed continual devel- opment.In 2006,the output of primary alumi- num in China reached 9.35 million...The aluminum and aluminum product process- ing industry in China is currently experiencing the 3rd high tide of high speed continual devel- opment.In 2006,the output of primary alumi- num in China reached 9.35 million tons,rank- ing first in the world for 4 vears on end.展开更多
基金Supported by National Key Basic Research Development Program of China(2002CB111505)~~
文摘[Objective] The aim was to explore the phylogenetic relationships of Cara- gana （Fabaceae） by the use of nrlTS sequences. [Method] Internal transcribed spac- er （ITS） sequences of nuclear ribosomal DNA （nrDNA） from 29 taxa of Caragana species and seven close relatives （all belong to Astralinae （Adens） Benth） were used for phylogenetic analysis. [Result] Length of the entire ITS region ranges from 611 to 614 bp in Caragana species. The aligned sequences nrlTS of Caragana are 655 bp, and 170 sites are variable, with 107 phylogenetically informative sites. The phylogenetically informative sites are 16.3% of the total aligned sequences. The ITS sequences data are useful to resolve some relationships at lower taxonomic levels within Caragana. The Caragana Fabr. is not a monophyletic group with very close connection with Calophaca tianschanica. The ITS data revealed that the species of Sect. tragacanthoides were dispersed in MP tree or ME tree. Although the morphol- ogy of C. ordosica is similar to C. tibetica, the ITS results revealed an unexpectedly close relativeship to C. roborovskyi. The ITS data also indicate C. davazamcii, C. korshinskii, C. intermedia, and C. microphylla are different species. [Conclusion] ITS sequences have an important reference value in exploring the relationships of Cara- gana.
文摘Two innovative techniques for manufacturing 0.1 micron MOSFETs are described. On e is SiO2-resist overetching method, in which an additional SiO2 layer is use d to short the gate length; the other is dual-exposure method, according to w hich two overlapped masks are exposed in a single lithography. Both of them are easy to implement,without any special processing technologies required.The layou t used in a real process is introduced. As a result, MOSFETs with minimal channe l length of 0.12 micron are obtained. Also, the test results on characteristic a re given. Finally, a conclusion is drawn that in 0.1 micron scale, both saturation currents and transconductorance of MOSFETs increase, while substrate currents de crease when channel length diminish.
文摘With the support by the National Natural Science Foundation of China and the Key Research Program of Chinese Academy of Sciences,Prof.Zhou Feng’s research group at Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,reported a caterpillar-inspired self-walking actuator in Small(2015,11(28):3494—3501).
文摘The aluminum and aluminum product process- ing industry in China is currently experiencing the 3rd high tide of high speed continual devel- opment.In 2006,the output of primary alumi- num in China reached 9.35 million tons,rank- ing first in the world for 4 vears on end.
