基于Canny算子和Hough变换的夜间车道线检测

针对夜间只有车灯照射路面图像整体较暗、光照不均匀、车道线不易检测的问题,提出了一种夜间车道线识别方法。首先,对预处理后的图像采用Laplacian算子进行边缘增强;然后,结合Otsu算法进行Canny边缘检测,再在边缘图像底部1/3区域中利用Hough变换进行直线拟合;最后,在斜率约束的基础上提出了一种内侧车道线提取算法,实现了车辆所在车道内侧车道线的检测。针对多种夜间车道线图像进行实验,结果表明,该算法准确提取出了内侧车道线。提出的方法能克服图像较暗和光照不均的影响,排除旁侧车道线、护栏等的干扰,有助于夜间车辆各行其道。     

也谈空间直线束

本文给出了空间直线束的概念,并给出了空间直线束的两种形式。     

关于旋转锥面与球面相交的研究(I)

用形数结合的方法对旋转锥面与球面相交进行研究．重点研究了交线的水平投影曲线,得出该曲线为著名的四次曲线——卵形线族的结论．通过对本曲线族的形状特征的详细研究得出如下结论：本曲线族中的每一条曲线都是由两支封闭的卵形成所组成,且其中的一支包围另一支;曲线的形状取决于方程式（ｘ２＋ｙ２－２ｒｘ＋ｐ）２－Ｌ２（ｘ２＋ｙ２）＝０中的参数ｐ、ｒ或Ｌ之值;当ｐ变化时,曲线形状由参数ｒ和Ｌ之值所确定;从而得出了本曲线的整个变化规律．交线的投影曲线方程直接为计算机快速绘制此类曲线提供了数学模型     

HDSL技术分析及应用

在分析ＨＤＳＬ原理和性能的基础上,对其ＣＡＰ（无载波调幅／调相）与２Ｂ１Ｑ编码进行了分析比较,并结合实例给出了ＨＤＳＬ技术的实际应用。     

Review of galactic and extragalactic searches for class I methanol masers

Class I methanol masers are important tools for investigations of star formation throughout the Universe. Recently, a series of surveys for class I methanol masers at the 95 GHz transition toward samples of young stellar objects have been undertaken. These surveys have resulted in the detection of about 200 new class I methanol masers and combined with previous increased the number of known observations they have class I methanol masers in our Galaxy to ~400. From analysis of the relationship between class I methanol maser emission and associated astrophysical objects, it has been shown that the intensity of the class I methanol maser emission is closely correlated with the properties of the 1.1 mm Bolocam Galactic Plane Survey （BGPS） dust continuum sources and outflow properties. This further supports the hypothesis that class I methanol masers are collisionally pumped and excited in shocked regions. Based on these observations, it can be inferred that the BGPS catalog is likely to provide more reliable samples for targeting further class I methanol maser searches. A new survey for class I methanol masers toward a larger size sample of BGPS sources to test this is currently underway. The prospects for detecting class I methanol megamasers in extragalactic sources is discussed, and observations constituting the first sensitive search have been proposed.     

ICP中27种元素间的光谱干扰

本文对27种常见元素(Ag、Al、As、B、Be、Ca、Cd、Co、Cr、Cu、Fe、Hg、La、Mg、Mn、Mo、Na、Nb、Ni、P、Pb、Sb、Si、Ti、V、W、Zn)的最杰出线的光谱干扰进行了研究,发现了一些光谱表上从未记载过的干扰线。     

G^3连续曲面的几何条件

三阶几何连续（Ｇ＾３）曲面的几何条件是建立在具有Ｇ＾２连续特征曲线的基础之上的,即曲线的曲率线,而且曲率线的曲率常常是曲面连续性的具体化。     

Chromosomal location of yellow rust resistance gene(s) inTriticum aestivum-Lophopyrum elongatum substitution lines

A set ofT. aestivum-L. elongatum substitution lines were studied on yellow rust resistance at seedling stage, inheritance of the resistance and esterase-5 (Est-5) analysis. The results demonstrated thatL. elongatum carried a new yellow rust resistance gene(s), which was dominant and located on chromosome 3E ofL. elongatum. The biochemical locus encoding Est-5 was also located on chromosome 3E, and was tentatively named Est-E5, which was co-segregant with theYr gene(s) in wheat background. In addition, the transmission frequencies of chromosome 3E in 3A/3E and 3D/3E hybrids selfing were significantly higher than that of chromosome 3E in 3B/3E hybrid, which was probably due to the difference on genetic relationships among A, B, D and E genomes.     

玉米自交系数量性状遗传参数研究

用数量遗传学的原理和方法,对２０个常用自选和引入的玉米自交系进行数量性状遗传参数的田间试验研究。结果表明：穗粗、行粒数、百粒重与单株产量的遗传相关达到正向极显著吐丝期、株高、穗行数、单株叶片数、单株产量的传力较高,受环境影响小,宜早代选择;单株产量的遗传进度较其余性状高,获得的遗传增量大,直接选择效果较为理想;穗粗、行粒数、百粒重以及它们所构成的选择指数对单株产量的相关遗传进度都较高,通过这３个性