改进的分子连接性指数与原子化热之间的关系

本文在链烷烃的分子图的基础上,切断分子图的任一条边(C-C键)成两个子图,以切断边的顶点为起点,对这两个子图的路径顶点数Nc(即子图中任一顶点到起始顶点这一路径中所包含的顶点数)的平方倒数求和(∑1N2c)然后进一步构造出两类新的拓扑指数———邻接矩阵特征根(X1cc,X2cc),距离积方根连接性指数和(Xc);同时,本文探讨了这些指数与相应链烷烃的原子化热(HA)的关系,结果表明本文所提出的拓扑指数与相应的链烷烃的原子化热(HA)具有良好的结构———性质相关性.     

漫步在古典与现代之间--简论林徽因的诗作

有着“中国第一才女“美誉的林擞因,是后期新月诗派的重要作家之一.林擞因的诗作上接我国的诗词传统,外应世界诗艺潮流,融中国传统诗学与西方现代诗艺于一妒,体现出古典与现代的双重色彩,呈现出独特的艺术特色,取得了较高的艺术成就.     

Whiplash shaking syndrome: retinal hemorrhages and computerized axial tomography of the brain

Three cases of whiplash shaking injury of infants are presented. All children presented with seizures and had minimal signs of external injury. Examination of the retina revealed extensive retinal hemorrhages. These were missed on initial examination and were only discovered after pupillary dilatation. The presence of these palecentered retinal hemorrhages suggested the diagnosis of child abuse and skeletal surveys and thorough social histories confirmed the diagnosis. Despite extensive retinal hemorrhages, computerized axial tomography (C.T.) scan showed minimal inter-hemispheric bleeding. In contrast to the "Battered Child Syndrome," all the findings in whiplash shaking syndrome of infants are subtle and demand an awareness, an index of suspicion and a thorough examination which may include extensive retinal examination following dilatation of the pupils. This latter examination is frequently not performed by family physicians and residents so that the syndrome may be missed. A fourth case is also discussed where shaking is admitted on initial presentation but said to be done for resuscitation. This poses an immense diagnostic dilemma to the pediatrician since in this case the child presented later with all the signs of physical abuse.     

基于CDMA/GPRS的DF1协议通讯驱动的开发

以AB DF1串口控制协议为例,说明了利用CDMA/GPRS DTU传输串口数据和组建无线远程控制系统(SCADA)的基本方法.对系统组建所涉及的软硬件环境进行了介绍,并详细描述了DF1控制协议的分析过程和将其与DTU开发包集成以实现新的通讯驱动的原理.通过此类原理,我们可以实现在统一的软件构架下,通过加载所需的通讯驱动,与包含不同用户设备的RTU进行通讯,而这样的RTU,均是采用DTU为其通讯手段.     

水稻颖壳异常发育突变体Oryza sativa extraordinary glume 1(Oseg 1)的遗传与基因初定位分析(英文)

A rice mutant with Japonica 9522 cultivar background Oryza sativa extraordinary glume 1 (Oseg 1) was identified from the M2 mutant pool mutagenized by ~(60)Coγ-ray.Compared with wild type plants,Ose9 1 developed longer empty glumes and rudimentary glumes.In some Oseg 1 mutants,the number of stamens of flowers was reduced and leaf-like lodicules occurred,and excessive lemma/palea-like organ could be observed in some mutant spikelets.This indicated that OsEG1 could regulate the development of rudimentary glumes,empty glumes,lemma/palea,lodicules,and stamens.Genetic analysis indicated that Oseg 1 came from a single recessive genetic locus.To clone OsEG1 gene,F_2 population was constructed by a cross between Ose9 1(Japonica)and Guangluai4(Indica).Using map-based cloning approach,OsEG1 was mapped on chromosome 4,between INDEL marker OS407 and WHM0466 with genetic distance of 2.0 cm and 1.0 cm,respectively.These results are useful for further cloning and functional analysis of the OsEG1 gene.     

基于USB2.0的实时视频图像采集系统设计

介绍了基于usb2．0协议的实时视频图像采集系统。给出了该系统的硬件组成原理及软件设计方法。主要介绍了采样控制器的设计。这种设计具有功能集成度高，实现方便的优点。具有较高的实用推广价值。     

网络教学3+1模块研究

网络教育的生命在于质量,而保证质量的前提是能否按照合乎网络教育规律的特殊教育模式实施网络教育。因此,寻找和研究可行的网络教育模式是网络教育项目开展的先导性任务。不同的教育理论产生不同的教育模式。成功的网络教学模式往往具有共性,有着坚实网络教学理论支撑的三大核心模块可以构成现代网络教学模式的稳定框架,而教师在模式实施过程的全程引导和管理又是模式能否有效运行的重要环节。     

0/1背包问题的DNA计算

0／1背包问题是一个著名NP——复杂问题，以前人们主要用分支——限界法、贪心法等方法去解决该问题。本文主要论述了一种新的计算模式——DNA计算来解决0／1背包问题。依据分子生物学的实验方法，文中所提出的算法是有效和可行的。     

生物系“2+1”教育实习初探

生物系从1998年起试行了“2+1”的教育实习,即在传统的教学实习基础上增加了生态环境教育。文章重点介绍了“2+1”教育实习的意义、作法及采取的一些相应措施。     

宋代方志《淳熙三山志》述评

《淳熙三山志》是现存宋元三十七种方志之一,是宋代州一级方志的代表。它是南宋状元宰相梁克家出任福州知州时组织学人编撰的现存福建最早的方志。它的价值和梁克家的人品、功名一样,永留青史。