有限域上某些对角方程的解数

设Ｉ（ｄ１…，ｄｎ）表示方程ｘ１／ｄ１＋…＋ｘｎ／ｄｎ＝（ｍｏｄｌ），１≤ｘｉ≤ｄｉ－１，ｉ＝１，…，ｎ的整数解（ｘ１，…，ｘｎ）∈Ｚ＾（ｎ）的个数。作者给出了当Ｉ（ｄ１，…，ｄｎ）＝２，２│ｎ以及Ｉ（ｄ１…，ｄｎ）＝３时，有限域Ｆｑ上的对角方程ｃ１ｘ１＾ｄ１＋…＋ｃπｘπ＾ｄｎ＝０，ｃｊ∈Ｆｑ＾＊，ｉ＝１，…，ｎ的解的数的直接公式，这里ｄｊ│ｑ－１，ｄｊ〉１，ｊ＝１，…，ｎ。     

New chronological evidence for Yanshanian diagenetic mineralization in China's Altay orogenic belt

Granitoids and related pegmatitic rare-metal deposits are widespread in China's Altay region, they used to be considered as Hercynian rocks and mineral deposits. Reported here are the 40Ar-39Ar ages of potassium-rich minerals (muscovite and microcline) in the Koktokay pegmatitic rare-metal orefield and whole-rock as well as quartz fluid-inclusion Rb-Sr isochron ages of granite and ores in the Shangkelan pegmatite rare-metal orefield. The ages indicate that there are Yanshanian Diagenetic Mineralization events happening in China's Altay orogenic belt and that formation of the famous Koktokay No.3 pegmatitic rare-metal deposit endured about 30 Ma of magmatic crystallization differentiation.     

不需要持续激励的辨识算法及其全局收敛性

本文提出了一种带有遗忘因子和死区的数据归一化递推最小二乘辨识算法,证明了这种算法不需要持续激励具有全局收敛性,且参数收敛到真值。最后通过例子给出了仿真结果。结果表明,本文算法不需要持续激励是可行的。     

Genetic diversity among Chinese sika deer （Cerrus nippon） populations and relationships between Chinese and Japanese sika deer

Sika deer （Cervus nippon） is a cervid endemic to mainland and insular Asia and endangered. We analyzed variation in the mitochondrial DNA （mtDNA） control region for four subspecies to understand the genetic diversity, population structure and evolutionary history in China. 335 bp were sequenced and eight haplotypes were identified based on 25 variable sites among the populations. Sika deer in China showed lower genetic diversity, sug- gesting a small effective population size due to habitat fragmentation, a low number of founder individuals, or the narrow breeding program. AMOVA analysis indicated that there was significant genetic subdivision among the four populations, but no correlation between the genetic and geographic distance. PhyIogenetic analyses also revealed that Chinese sika deer may be divided into three genetic clades, but the genetic structure among Chinese populations was inconsistent with subspecies designations and present geographic distribution. Including the sequence data of Japanese sika deer, the results indicated that Chinese populations were more closely related to Southern Japanese populations than to the Northern Japanese one, and the Taiwan population was closer to populations of Northeastern China and Sichuan than to those of Southern China.     

H~∞状态反馈控制问题的ARE方法

本文研究状态反馈控制器的H~∞优化设计问题.文中阐明了系统传递函数的H~∞范数与其状态空间实现及代数Riccati方程(ARE)之间的关系.在此基础上给出了状态反馈控制器H~∞优化设计的两个定理.文中提出的设计方法,适用于一般系统,为状态反馈控制器的设计提供了理论基础和基本算法.     

高铝GaAlAs及其多层结构MOVPE生长特性

本文报导了高铝GaAlAs及其多层结构的生长特性.X光双晶衍射结果表明,多层GaAlAs叠层材料的X光双晶衍射峰呈现多级卫星峰,这表明材料具有良好的晶体完整性和结构周期性.     

我国对大熊猫饲养繁殖的研究与进展

我国饲养的大熊猫累计已达200只,现尚活着的约100只。36年来共繁殖53胎,产86仔,存活28只。由于饲养而产生不孕和不配现象,以及幼仔存活率低等,通过研究,揭示出原因,并展现出了发展的前景。     

马边大风顶自然保护区大熊猫的食性与采食行为

报道了凉山马边大风顶自然保护区大熊猫的食性和采食行为，根据一年中大熊猫食物组成的变化规律将大熊猫的摄食分为４个时期；食叶期，过渡Ｉ期，食杆－笋期和过渡Ⅱ期，并对其采食行为进行了研究。     

金雕染色体核型

本文利用骨髓染色体制片技术对金雕(Aquila Chrysaetos)染色体核型进行了研究。金雕染色体数为2n=70,核型公式为KF=ZMZM+34M/SM+24T+100。对全部染色体相对长度、臂比等进行了测定,绘制了染色体组型模式图。