“海口号”车／客渡船型线设计分析

文中介绍了“海口号”车／客渡船双尾节能船型的特点及型线设计方法，讨论了纵中剖线形状、位置及尾轴间距等参数对船舶阻力和推进性能的影响及选取原则，以及实船试验结果．     

小麦B染色体组双端体光合性能的初步研究

与对照ＣＫ相比，各供试Ｂ染色体组双端体材料的旗叶光合性能表现不同，多数Ｂ染色体长臂、２ＢＳ、７ＢＳ对叶绿素含量具有正效应，３ＢＬ、４ＢＳ、５ＢＳ具有负效应，在光合功能上，３ＢＬ、１ＢＳ、４ＢＳ、５ＢＳ表现为负效应，５ＢＬ、６ＢＬ、７ＢＬ、２ＢＳ、３ＢＳ、７ＢＳ则表现为正效应，不同部位染色体臂缺失对叶绿素含量和光合速率的不同效应，可能是由于染色体臂缺失后，光合机构和光合功能相关的基因结构与表达发生改变所致。     

杂交稻及其三系叶片衰老过程中叶绿体的变化

研究了杂交稻及其三系叶片衰老过程中叶绿体数量和结构的变化。     

Evaluation matrix with the speed feature based on double inspiriting control lines

Methods of the comprehensive evaluation have been studied for many years. However, the change speed of evaluated objects was rarely considered by the existing evaluation methods. An evaluation matrix is proposed to remedy this deficiency. Firstly, the change speed state （CSS） of the evaluated objects is analyzed based on double inspiriting control lines （DICLs）, and a matrix of the CSS is constructed. Then, 72 elements in the matrix are analyzed, and formulas describing each CSS are given. The efficiency of the proposed evaluation matrix is proved when the CSS merges with the change speed trend （CST） in the dynamic comprehensive evaluation. Finally, a computing example shows that the proposed evaluation matrix is feasible in the dynamic comprehensive evaluation with the speed feature.     

绘制滑移线场的一各新方法

针对滑移线场混合边值问题绘制方法的不足,提出了用二阶偏导数判断已知滑线的凹向,用曲率半径绘制圆弧替代微段移滑线的方法。     

非均匀传输线的宽带3分贝耦合器设计

利用非均匀耦合传输线的奇、偶模S-参数特性,提出了一种宽带3 dB耦合器的设计方法.用级连ABCD矩阵对所设计出的耦合器的分布参数特性进行仿真,结果表明非均匀耦合传输线可以有效适用于宽带方向性耦合器设计.     

Skeletal morphogenesis and growth check lines in the Antarctic bryozoan Melicerita obliqua

Skeletal morphology and colony growth pattern of the Antarctic bryozoan Melicerita obliqua from the eastern Weddell Sea, on the Weddell Sea shelf, have been investigated in order to test the hypothesis of a relationship between growth banding and the seasonal variability of the high Antarctic environment. Melicerita obliqua is a common endemic species on Antarctic shelves. The colonies are bifoliate-flattened and sabre-shaped, and are anchored with organic rootlets in the sediment. The most significant feature of the skeletal morphology is the segmentation of the colony caused by the formation of annual growth check lines. Formation of check lines occurs as a combination of thickened walls in the proximal part of the nodal autozooid and an oblong, thin-walled distal part. Both are separated by a back-fold of the frontal cryptocyst resulting in a narrow slit on the cryptocyst. Changes in the length of autozooids and segments indicate seasonal and inter-annual variations in the environmental factors. Within a segment, nodal autozooids are longest, whereas autozooids immediately proximal to the next node are shortest. The length of segments varies within a single colony but shows a slight decrease with colony age. Melicerita obliqua displays a slightly decreasing growth rate with increasing age, hinting at a limited life span fixed in the genetic programme. Individual colonies of M. obliqua reveal a maximum age of about 45 years. Seasonal growth patterns in the colony are expressed in segment formation with nodes and internodes, differences in autozooid length, and polypide degeneration/regeneration cycles. Sizes of segments within colonies are used to calculate colony growth rate. Variations in colony growth rate calculated from length increment of segments depict a pattern of longer and shorter segments indicating phytoplankton variability between the years.     

试论毛泽东“两条线”外交的理性

时代的矛盾和国家利益的层次性是判断国家外交在某一时期是否理性的最主要依据。＂两条线＂外交有得有失,但从那一时代的矛盾看这一外交具有一定的客观性和合理性,从国家利益的层次性看这一外交也基本上是理性和成功的。     

极限论在中学数学中的应用

数学分析中最基本的理论是极限理论,本文用极限论证明了中学数学中一些重要的公式.     

中空基础在输电线路黄土地基中的承载特性研究

随着杆塔基础承担的载荷不断增大,黄土地区常用的挖孔灌注桩呈现直径大、埋深大的工程特征,大大削弱了其经济性和环保性。联想到筒桩基础良好的工程性能,结合输电线路自身的行业特点和黄土的土质特性,提出了应用于黄土地区的中空基础。而对于中空基础的理论计算,没有现成的计算公式可以应用。基于单桩基础的内力和承载力理论计算方法,分析了中空基础相应的理论计算方法。利用数值模拟和现场原位试验,阐述了该理论计算方法的合理性,为中空基础的工程应用和设计提供参考;同时,现场原位试验表明中空基础承载力远远大于相应线路的设计值,可在工程中进行试点推广应用。