色噪声驱动下延迟双稳系统中的相干共振

研究了乘性色噪声和加性白噪声驱动下的延迟双稳系统.应用Kampen理论、Novik-ov理论、绝热近似理论和两态理论得到功率谱表达式.发现了随着加性噪声强度的增加出现了相干共振现象,且共振发生在延迟时间与加性噪声强度之间.乘性噪声强度会降低系统的输出;色噪声的自相关时间能够加强系统的输出;且在较大的自相关时间下,较小的加性噪声强度就能使系统产生共振现象.     

Construction of AFLP-based genetic linkage maps for the Chinese shrimp Fenneropaeneus chinensis

Fenneropaeneus chinensis is an important species in marine fishery resources and aquaculture in China. A genetic linkage map is essential for improving the efficiency of its breeding by marker-assisted selection and identifying commercially important genes. Linkage maps of F. chinensis were constructed with an F2 mapping population （110 progenies） using amplified fragment length polymorphic （AFLP） marker in this study. Fifty-five AFLP primer combinations produced 532 AFLP markers fitting for map strategy in mapping family. The markers with 3：1 segregating ratios were analyzed using F2 intercross model for the common linkage map, while the markers with 1：1 ratio were analyzed using the pseudo-testcross strategy. The maps of male, female and common were constructed. The female map included 103 markers that formed 28 linkage groups, covering a total length of 1090 cM. All markers were linked with the linkage groups. Segregation distortion was observed for 6 of 103 markers in the female map. The average distance between markers was 14.53 cM and ranged from 4.4 to 24.8 cM. The male map included 144 markers that formed 35 linkage groups. Ten markers remained unlinked in male map. Segregation distortion was observed for 7 of 144 markers in the male map. The total distance of male map covered 1617 cM. The average distance between markers was 16.36 cM. The male map was 32.6% longer than the female map, which may reflect sex-specific recombination rates in Chinese shrimp. The common map was composed of 216 markers, including in 44 linkage groups covering a total distance of 1772.1 cM. Two markers remained unlinked. No distorted markers of 216 markers were shown in the common map. The distance between markers was 10.42 cM. An average estimated genome size for the Chinese shrimp was 2420 cM, which was consistent with the relative size of the Penaeid genome. The distribution of AFLP markers was relatively even in chromosomes of Chinese shrimp maps. The linkage analysis presented in this work provided some insight     

开源主题图Ontopia引擎工作机制研究

在概要分析OKS知识组件和Ontopia主题图引擎体系结构的基础上,深入分析了引擎API的主要开发包、核心接口之间的构成关系以及实现形式。针对Ontopia引擎接口对主题图创建、存储、数据交换和应用功能开发等方面的支持,并结合具体代码实现方法对引擎工作原理进行了全面分析。     

凝聚映象的耦合不动点定理

Dajan G and Lakshmikanthan(Nonlinear Anal 11(1987).623～632)对算子的耦合不动点进行了研究,本文将上文中的一个结果从全连续映象推广到次连续凝聚映象且对锥不作任何要求.     

土地利用基础图件数据库建库与更新技术研究

新一轮国土资源大调查已经于1999年启动,它是一项跨世纪的基础性、公益性、战略性的宏伟工程.土地利用基础图件的数据库建设是其中的一项重要内容.本文结合包头市土地利用基础图件数据库建库和更新的实际工作,对土地利用基础图件数据库建库和更新的技术流程、技术方法以及存在的问题进行了探讨.     

微处理器测试图形采集程序自动编程系统的设计

提出了微处理器ＭＰ测试图形采集程序自动编程系统的一种设计方案，系统在读入测试开发人员对ＭＰ的描述后，能自动建立ＭＰ的抽象模型并产生直接在Ｓ－１０测试仪上运行的ＦＡＣＴＯＲ语言ＭＰ测试图形采集程序．     

单调地次连续半紧1—集压缩映象的耦合不动点定理

在半序Ｂａｎａｃｈ空间获得了单调地次连续半紧１集压缩映象的耦合不动点定理．定理设（Ｘ，Ｐ）的半序区间［ｕ０，ｖ０］非空，Ａ：［ｕ０，ｖ０］×［ｕ０，ｖ０］→（Ｘ，Ｐ）是混合单调半紧１集压缩算子，且满足ｉ）Ａ［ｕ０，ｖ０］×［ｕ０，ｖ０］有界；ｉ）ｕ０≤Ａ（ｕ０，ｖ０），Ａ（ｖ０，ｕ０）≤ｖ０；ｉｉ）Ａ在ｘ和在ｙ单调地次连续．则Ａ有极大极小耦合不动点（ｘ，ｙ）∈［ｕ０，ｖ０］×［ｕ０，ｖ０］，且ｘ＝ｌｉｍｎ→∞ｌｉｍｍ→∞ｕ（ｍ）ｎｙ＝ｌｉｍｎ→∞ｌｉｍｍ→∞ｖ（ｍ）ｎ     

Decay of geometry for unimodal maps: The C2 case

We prove that a C2 unimodal interval map with critical order not greater than 2 has the decay of geometry property, by showing that all the cross-ratio estimates needed in the previous proof for the C3 case remain true.     

Hermitian矩阵空间上保秩一的可加满射

刻画了Hermitian矩阵空间Hn(C)上保秩一的可加满射Φ,给出了Φ保可逆元时的形式,以及保行列式时的形式。     

三角代数上的Jordan三元映射

设T是三角代数,B是有理数域Q上的代数,r是一个有理数,本文的主要目标是研究从T到B上的Jordan三元映射的可加性。利用三角代数的矩阵结构,证明了如果ф是从T到B上的双射,满足任给a,b,c∈A都有ф（r（abc＋cba））=r（ф（a）ф（b）ф（c）＋ф（c）ф（b）ф（a））,则是可加的。