上海动物园野生鸟类寄生线虫纪述

本文报道了8种野生鸟类寄生线虫,隶属5属4科.其中斯氏双三齿线虫(Diplotriaenaskrjabini)和鹎双三齿线虫(Diplotriaena,pycnonotic)为我国新记录.白脸山雀(Parus ma-jor)、棕草鹛(Garrulax koslowi)、灰头雅雀(Paradoxornis gularis)3种为宿主新记录。     

荔枝胚胎发育机制的探讨

荔枝胚胎发育,有正常型、败育型和部分败育型3类。研究表明,不同类型的胚胎发育状况是可遗传的性状,由一个多基因系统所支配的。在这个基因系统中,某个或几个基因发生突变时,可能导致胚胎发育在某个阶段受到阻遏,使胚胎发育中途停顿,产生败育种子。完全败育型是在胚胎发育早期阶段受阻,故败育时期早,种子极小;部分败育型可能是一种突变杂合体,由于雌雄配子结合子的基因型不同,导致同一植株上果实间胚胎发育状况以及发生败育时期的差异,有的种子发育正常,有的败育;种子大小呈连续的变异状态。     

球面上的分布积(英文)

设δ(S_α)为集中作用在S_α={||×||=α|α>0,x∈R~p}上的δ函数,其定义为: [δ(S_α),φ(x)]=∫_(S_α)φ(x)ds.函数(r-α)~(-m)(m=1,2,…)在R~P中非连续点的集合为S_α。我们运用中性极限和收敛于δ(S_α)的δ序列,在S_α上定义了分布积(r-α)~(-m)oδ(S_α).     

COMPUTER-AIDED ANALYSIS AND DESIGN FOR THE BASE STRUCTURE OF A MOVABLE TOWER CRANE

This paper is one of the achievements of the researchitem for computer-aided design of tower crane's steel structure.In thepaper,taking the well-base structure as an example,first the method establishing the mechanical model is explained for the base structure ofa movable tower crane.Then the math model of its optimal design andthe N-S figures for the computer program is described and calculatedusing discrete optimal technology.Finally the problems related to thedesign for the base structure of a movable tower crane are briefly illu-strated.     

CONTRIBUTORY MODELS ON SYNTHETICAL EFFECT OF SCIENCE-TECHNOLOGY FROGRESS IN BUILDING ENTERPRISTS

This paper disusses an important component part of the decision support sys- tem of science-technology management in building enterprises.It establishes the increasing degrees and dynamical productive fuctional model in building enterprises,and ayear contribultory models of investing labour and produtive fund,effect of profit-tax and productive total cost ect.     

ANALYSIS OF THE BEHAVIOUR OF HIGH STRENGTH BOLTED SHEAR CONNECTIONS

On the basis of experimental tests,a formula is proposedfor the computation of the load-deformation curves of the single highstrength bolted connections in axial shear forces,which is a piecewisefunction describing three stages of friction,slipping and bearing of theconnections,and is also suitable for the non-slip connections.The limitstate method is used to compute the behaviour of high strength boltedconnections subject to eccentric shear,in which each bolt obeys thenon-linear relationship aforementioned.In this paper,the computer pro-gram is worked out to solve the non-linear problems.Analytical resultsare shown to be in general good agreement with experimental data.     

A SINGULARITY PROPAGATION FOR SEMILINEAR WAVE EQUATIONS

This paper discusses the propagation of singularity forsemilinear wave equations.By use of the theory of para-differentialoperators and the method of microlocal analysis,some results for generalsemilinear wave equations are obtained.     

ANALYSIS OF STABILITY OF ZERO SOLUTION OF LAMINAR BOUNDARY LAYER EQUATION WITH SIMILAR FLOW

When having similar flow,a two-dimensional equationfor incompressible laminar boundary layer can be transformed into aFalkner-Skan equation.This paper has made transformation of F-Sequation into two-order non-autonomous system by variable permutationwith its stability around zero solution discussed and explained physi-cally.     

小麦籽粒质地与化学组成关系的研究

小麦籽粒的角质率与硬度是两个描述种子质地的概念.二者相互联系,而又不完全相同.籽粒质地主要是由化学组分决定的,特别是支,直链淀粉的比例.同一品种内籽粒质地的差异也主要是由化学组分差异造成的.各种籽粒化学成分的比例.较其含量对质地的影响大.