利用扫描电子显微镜像片测定人血球的体积

利用扫描电子显微镜拍摄红血球立体像片对,并对其测绘了等值线图和测定了体积。红血球体积的测定,可以采用本文中的任何一种方法。文中还叙述了测定血球体积的三种方法,即利用红血球等值线图计算体积的方法;数字高程模型(DEM)方法;分带截面法。通过试验证明红血球的体积大小不等,形状也不完全一样,有球形、环状、卵形和椭圆等,红血球总形状是两面微凹,中间薄,最低点约0.23μm,边缘部厚,最高点约为1.51μm,其直径平均值为7.4μm(6.9～7.8μm),体积平均约为18.91μm~3(试验数据的平均值)。     

A Theorem on Surface with Parallel Nondegenerate Minimal Section

本文给出了空间形式中具平行极小截面曲面的一个定理,从而将文献中相应结果推广到一般的m维空间形式中。     

桩基动力检测和监测软件系统

经十余年桩基动力检测研究并吸收国内外检测软件的优点，设计了新一代桩基检测和临测软件系统，使桩基完整性分析定量化和承载力计算自动化。     

《华东师范大学学报》(自然科学版)1986年总43～46期 总目录

┌─────────────────────────┬─────────┐│题目 │作者 │├─────────────────────────┼─────────┼──┐│ 数学 │辞行鸿汪抓鹅 │43 ││ 望(x)一subPrarnalt和适应序列的a.s.收敛 │希天雄 │盛     

箱形梁最轻设计法

设计箱形截面梁时可采用四个参变量:梁高h、腹板厚度t及两个系数α和β,根据强度条件、局部稳定条件及刚度条件得出一个求截面积最小的目标函数A,将已知条件(截荷、材料、跨度、支承情况等)代入进行求导即可最终求出四个参变量,截面尺寸即可确定,且其截面积必为最小.然后将截面尺寸园整,布置加劲肋,最后进行截面各方面的总校核,必要时对截面尺寸作些修正,设计即告完成.这种设计法从理论上保证了截面尺寸为最小;即使经过修正,尺寸也必然接近最小.而且设计是一次完成,避免了通常凑截面反复计算的繁琐性和盲目性.     

正格子点上L族的若干注记

为了获得重尾分布子族，．族的相关性质和结果。本文采用数学归纳法，给出了正格子点上，族的独立同分布列（i．i．d．）Poisson逼近的等价条件及判别该列能否Poisson逼近的一个方法。它比Embrechts等给出的检验方法更简洁．另一方面，给出了正格子点上，族的可加性的一个特别的证明．     

FRP加圈钢筋混凝土梁片材厚度计算

在计算单边加筋矩形截面梁的正截面承载力以及FRP加固层厚度时，本文做了如下几点基本假设；     

Slow Positron Beam Research Platform

A NSFC supported project-"Slow positron beam (SPB) research platform and its applications" achieved the 1st class Science and Technology Award of Beijing Municipality.     

Fuel design real-time to control HCCI combustion

In order to achieve lower emissions and extensive load in the homogeneous charge com- pression ignition (HCCI) engine system, a novel fuel design concept that high-octane number fuel and high-cetane number fuel are mixed real-time to con- trol HCCI combustion is proposed in this study. HCCI combustion fueled with iso-octane/n-heptane mix- tures controlled real-time on a single-cylinder HCCI combustion engine is studied. The test results show that the equivalence ratio of n-heptane in mixtures decides ignition and controls the combustion phase of HCCI combustion. The addition of iso-octane ex- tends knocking limit in equivalence ratio somewhat, but knocking occurrence mainly depends on the total concentration of mixture. Although operating range in equivalence ratio becomes narrow with the increas- ing proportion of iso-octane, the maximum load of HCCI combustion fueled with iso-octane/n-heptane mixtures controlled real-time is increased about 80% more than that of pure n-heptane. When iso-octane/ n-heptane mixtures are controlled in optimized method, it is proved that the load of HCCI combustion can be fully extended and emissions can be de- creased remarkably, while at the same time the higher indicated thermal efficiencies are obtained over the extensive operation range.