公路设计中的线形拟合

本文对现有公路平、纵面线形的拟合方法进行研究；介绍了线形拟合的理论依据，操作步骤，提出了利用计算机进行旧路改、扩建设计和连接线设计中线形设计的方法。     

简介二灰稳定砂砾基层在南宁市西乡塘大道的应用

从粉煤灰、石灰、砂砾材料质量控制及施工控制等方面，简述二灰稳定砂砾基层在南宁市市政道路的应用情况。     

PROLIFERATION AND MIGRATION OF EPENDYMAL CELLS IN THE BRAIN OF ADULT RATS AFTER PERMANENT FOCAL CEREBRAL ISCHEMIA

Objective Ependymal cells are thought to be the primary source of neural stem cells in the adult central nervous system. The purpose of this study is to examine spatial and temporal profiles of ependymal cell proliferation and migration after focal cerebral ischemia. Methods Eighty male Sprague Dawley rats underwent permanent middle cerebral artery occlusion after injection of 10/μL of 0.2% Dil into the lateral ventricle. Rats were sacrificed and brain sections were acquired for pathological evaluation and laser confocal imaging at day 1,3,7,11,14,21 and 28 after ischemia. Results The density of Dil-labeled cells in the ischemic ipsilateral subventricular zone was significantly higher than that in the control group and these labeled cells dispersed in the ischemic ipsilateral subventricular zone and/or were located in ependyma from day 1 to 11. In the ischemic ipsilateral cortex, some Diilabeled cells occurred in peri-infarction and infarction of parietal region at day14 and peaked at day 21 when some Dil-labeled cell nodules were found in this region. During postischemic day 14--28, a significant decrease in labeled celldensity in the ischemic ipsilateral subventricular zone was coincident with a significant increase in labeled cells density in the cortex (peri-infarction and infarction). Conclusion The results indicate that ependymal cells proliferate and migrate after focal cerebral ischemia in the adult rat brain.     

经纬仪二倍半丝法视距测量的精度分析

笔者针对采用经纬仪二倍半丝读数能否作为视距的问题进行讨论．经过严密的数学推导，得出了采用二倍半丝与采用全丝读数视距差值的数学模型；通过绘制差值的变化曲线和视距测量的精度进行比较，对该问题做出了明确的结论和建议．     

坐标换带的基本概念及其在公路设计中的应用

阐明坐标换带计算的有关概念,并介绍其在公路设计中的应用.     

二灰碎石施工质量控制初探

结合沈大高速公路改扩建工程二灰碎石施工，分析了影响质量控制和压实度的几个要素，并说明了施工过程中的各注意事项。     

影响CVD法形成VB2薄膜的因素

研究了反应气体的化学当量比、基板材料、基板温度对ＣＶＤ法形成ＶＢ２薄膜的影响。结果表明，化学当量经，绒板材料影响薄膜中ＶＢ２的含量，基板温度影响结晶粒子形态。     

二灰砂砾配合比设计方法研究

通过室内测试分析,结合二灰砂砾混合料的特点,提出了基于性能设计原则的二灰砂砾混合料配合比设计方法.     

一种新的红外二值图像递归标记算法

提出了一种新的红外图像识别算法．该算法根据图像预处理分割后的二值图像，对目标图像进行递归标记，避免了基于点的连通体检测中“Ⅰ”像素点可能被重复扫描的现象，实现了只考虑提取目标特征，不用得到最终的标记图像本身的要求，更加有利于对目标的检测与跟踪．分析、实验结果表明算法对理想及带噪声的输入均有较好的识别率，能提高目标单帧检测概率．算法易于实现并行处理，提高了图像处理实时性，具有一定的工程实用性．     

大跨度钢管拱管内混凝土一次顶升施工技术

东莞水道大桥主桥是一座主跨为280m的中承式钢管混凝土拱桥,针对大桥管内C50微膨胀混凝土施工,对一次顶升压注混凝土的可行性进行了分析,介绍了输送泵及泵管的选择和混凝土配比的设计,并对压注施工工艺、质量控制做了详细的介绍。