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六面体小微卫星散热面最优化设计 被引量:2
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作者 黄金印 赵欣 +1 位作者 麻慧涛 刘庆志 《航天器工程》 2013年第6期48-52,共5页
以散热面吸收外热流最小为目标函数,建立了基于六面体卫星的散热面最优化设计模型,并以某倾斜轨道六面体小微卫星为例、针对不同卫星热耗分别得出了最优化的散热面布局。计算结果表明:采用文章所述的最优化设计方法得到的散热面布局,可... 以散热面吸收外热流最小为目标函数,建立了基于六面体卫星的散热面最优化设计模型,并以某倾斜轨道六面体小微卫星为例、针对不同卫星热耗分别得出了最优化的散热面布局。计算结果表明:采用文章所述的最优化设计方法得到的散热面布局,可以有效降低由于卫星吸收外热流变化造成的整星温度的波动,可以为六面体卫星散热面的优化设计提供理论支持;进一步分析表明,不同热耗水平的卫星对应不同的最优化散热面布局。 展开更多
关键词 外热流 散热面 最优化设计 小微卫星
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Comparison of Newly Synthetic Hexaploid Wheat with Its Donors on SSR Products 被引量:2
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作者 张连全 孙根楼 +5 位作者 颜泽洪 陈其皎 袁中伟 兰秀锦 郑有良 刘登才 《Journal of Genetics and Genomics》 SCIE CAS CSCD 北大核心 2007年第10期939-946,共8页
Microsatellites or SSRs as powerful genetic markers have widely been used in genetics and evolutionary biology in common wheat. Because of the high polymorphism, newly synthesized hexaploid wheat has been used in the ... Microsatellites or SSRs as powerful genetic markers have widely been used in genetics and evolutionary biology in common wheat. Because of the high polymorphism, newly synthesized hexaploid wheat has been used in the construction of genetic segregation population for SSR markers, However, data on the evolution of microsatellites during the polyploidization event of hexaploid wheat are limited. In this study, 66 pairs of specific to A/B genome SSR patterns among newly synthesized hexaploid wheat, the donor tetraploid wheat and Aegilops tauschii were compared. The results indicated that most SSR markers were conserved during the polyploidization events of newly synthetic hexaploid wheat, from Triticum turgidum and Ae. tauschii. Over 70% A/B genome specific SSR markers could amplify the SSR sequences from the D genome ofAe. tauschii. Most amplified fragments from Ae, tauschii were detected in synthetic hexaploid at corresponding positions with the same sizes and patterns as in its parental Ae. tauschii. This suggested that these SSR markers, specific for A/B genome in common wheat, could amplify SSR products of D genome besides A/B genome in the newly synthesized hexaploid wheat, that is, these SSR primers specific for A/B genome in common wheat were nonspecific for the A/B genome in the synthetic hexaploid wheat. In addition, one amplified Ae. tauschii product was not detected in the newly synthetic hexaploid wheat. An extra-amplified product was found in the newly synthetic hexaploid wheat. These results suggested that caution should be taken when using SSR marker to genotype newly synthetic hexaploid wheat. 展开更多
关键词 synthetic hexaploid wheat SSR (microsatellite) genome specificity transferability molecular marker
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GYRO BIAS ON-ORBIT CALIBRATION FOR MICRO SATELLITES 被引量:1
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作者 郁丰 刘建业 熊智 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2007年第4期300-304,共5页
According to gyro application in micro-satellites, a new gyro bias real-time on-orbit calibration technology is presented and it is independent of any other sensors. The approach relies on gyro on-orbit measurements r... According to gyro application in micro-satellites, a new gyro bias real-time on-orbit calibration technology is presented and it is independent of any other sensors. The approach relies on gyro on-orbit measurements restricted by satellite attitude dynamics and estimates the gyro bias generated when the gyro is electrified. Observability of the calibration model is analyzed and applicable conditions of the technology are derived. Simulation results indicate that the calibration algorithm is accurate and robust at gyro sampling rate, and its convergence speed is fast. Within the given attitude dynamics model error, the convergence time is less than 100 s and the convergence accuracy is about 1.0 (°)/h. Calibration performance can meet requirements of spacecraft operations. 展开更多
关键词 on-orbit calibration gyro bias Kalman filter micro satellite
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Microsatellite Genotyping for Four Expected Inbred Mouse Strains from KM Mice 被引量:1
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作者 张晓娟 朱朝辉 +2 位作者 黄朝峰 谭萍萍 马润林 《Journal of Genetics and Genomics》 SCIE CAS CSCD 北大核心 2007年第3期214-222,共9页
Chinese Kun Ming (KM) mouse, an outbreed strain of laboratory animal, has been widely utilized in related pharmaceutical and genetic studies throughout China. However, the value of KM mice to the research community ... Chinese Kun Ming (KM) mouse, an outbreed strain of laboratory animal, has been widely utilized in related pharmaceutical and genetic studies throughout China. However, the value of KM mice to the research community has been severely limited, partially due to the fact that well-characterized inbred strain of KM mice is not available. Several expected inbred strains from KM mice have been bred, but their genetic purity remains uncertain. In this study, four expected inbred strains of KM mice (A1, T2, N2, and N4) were chosen and their inbred degree were compared with two classical inbred mouse lines (BALB/c and C57BL/6) by analyzing the genotypes of about 30 microsatellite markers. In the four strains, A1 and N4 were homozygous at all genotyped loci, but N2 and T2 were only heterozygous at locus D15Mit16. These results indicate that the level of genetic purity/homozygousity of A1, N4, N2, and T2 inbred line is comparable to those of BALB/c and C57BL/6. This study provided the first and solid evidence for genetic purity of four expected inbred strains of KM mice. These 4 inbred mice strains should be well maintained for further characterization and utilization in genetic studies. 展开更多
关键词 KM mice inbred strain microsatellite markers GENOTYPING
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