Experimental study on slope sliding and debris flow evolution with and without barrier

A constitutive model on the evolution of debris flow with and without a barrier was established based on the theory of the Bingham model. A certain area of the Laoshan Mountain in Nanjing, Jiangsu Province, in China was chosen for experimental study, and the slope sliding and debris flow detection system was utilized. The change curve of the soil moisture content was attained, demonstrating that the moisture content of the shallow soil layer increases faster than that of the deep soil layer, and that the growth rate of the soil moisture content of the steep slope is large under the first weak rainfall, and that of the gentle slope is significantly affected by the second heavy rainfall. For the steep slope, slope sliding first occurs on the upper slope surface under heavy rainfall and further develops along the top platform and lower slope surface, while under weak rainfall the soil moisture content at the lower part of the slope first increases because of the high runoff velocity, meaning that failure occurring there is more serious. When a barrier was placed at a high position on a slope, debris flow was separated and distributed early and had less ability to carry solids, and the variation of the greatest depth of erosion pits on soil slopes was not significant.     

家用电器设备电子故障检测方法研究

人们生活水平逐步提高,家中使用的电器设备种类也越来越多.除了常见的电视、冰箱、洗衣机以外,空调、智能厨具、打印机等等也走进了千家万户.这些电器在使用中经常会出现故障,针对常见的故障进行检测,通常需要电子、机电等方面的知识.本文作者结合自身多年实践经验,首先分析了家用电器的安全检测策略,重点对家用电器电子设备元器件的检测方法进行了探讨,具有一定的实际指导意义.     

牛奶中乳糖含量的测定

牛奶是生活中不可或缺的营养品,乳糖是牛奶的重要组成成分之一,测定牛奶中乳糖的含量可以确定牛奶是否掺假。目前牛奶中乳糖的测定方法有很多,主要从旋光仪法、比色法、酶化学法、离子色谱电化学修饰法、高效液相色谱法、近红外光谱法以及光折射法做了主要介绍。     

基于邮政媒介的国际文化特色体育赛事形象推广设计研究

本文以古城凤凰国际围棋赛事宣传为背景,深入分析了邮政传媒产品的形式和特色,提出了以主办地凤凰古城历史人文特色和围棋传统文化于一体的邮资产品的宣传策划系列方案,凸显文化赛事的特色和赛事形象的识别度,实现了提升赛事的社会影响力和促进凤凰古城形象传播的双赢效果,可为国际体育文化赛事宣传策划提供参考。     

Characterization of aquatic groundwater colloids by a laser-induced breakdown detection and ICP-MS combined with an asymmetric flow field-flow fractionation

This study investigated the characteristics of natural groundwater colloids by a laser-induced breakdown detection (LIBD) and inductively-coupled plasma mass spectrometry (ICP-MS) in a combination with an asymmetrical flow field-flow fractionation (AsymFFFF). The groundwater was sampled from a borehole in the Yuseong area of Daejeon, Korea at different geological depths from 30 to 460 m and its geochemical parameters were measured. The combination of AsymFFFF and LIBD revealed a heterogeneous size fraction with a relatively broad size distribution of the groundwater colloids. One of the size fractions of the groundwater colloids was about 20 nm up to smaller than 100 nm, and the other fractions were larger than 100 nm. The elemental composition of the groundwater colloids was also analyzed by the AsymFFFF coupled with an ICP-MS. Results from the ICP-MS coupled with the AsymFFFF provided us with information about the size-specific elemental composition. The smaller sized fractions mainly consisted of calcite colloids with strontium, whereas the larger fractions were comprised of colloids such as aluminosilicates and iron oxides. The observations of all the groundwater samples indicate a similar pattern for the colloid fractions in size and in element composition except in the concentration.     

基于信息融合的分布式入侵检测体系结构研究

随着计算机与网络技术的发展,入侵技术也越来越先进。许多入侵行为都具备反检测的能力,这些行为会模仿被入侵体系的正常用户行为或通过多台主机联合攻破被入侵系统。针对较复杂的入侵行为,仅靠一个传感器来提供信息很难与正常用户行为进行识别,必须通过多传感器信息融合的方法来提高对入侵的识别能力,同时降低误判率。     

虚拟装配中实时碰撞检测方法研究

本文介绍了基于层次包围盒的碰撞检测算法,并着重对现有的各种包围盒类型进行了分析比较。文章对OBB包围盒的计算算法、包围盒树的建立算法、包围盒的重叠测试进行了研究,最后以OBB验证了该类算法的有效性和正确性。     

C#的高级应用——构建控件

随着越来越多的人使用c#语言,目前的c#标准控件已经不能满足所有人的要求了,人们迫切希望能自己构建控件。经过近年在教学中的使用,笔者将C#中构建控件的几种方法和使用的场合做个总结,以使更多学习c#的人能够快速掌握。     

计算机网络安全及其防范技术

计算机网络发展速度非常迅猛,与之而来的计算机网络安全显得尤其重要。本文从计算机网络安全问题以及导致计算机网络安全的因素进行了全面分析,提出了计算机网络安全防范的相应对策。     

彩色环境下基于惯性矩的椭圆检测算法

提出了在彩色环境下检测椭圆的新算法。首先分析了椭圆的解析结构,根据物理学中惯性矩的概念,推演出一个类椭圆区域的理想椭圆,用该理想椭圆与边缘检测获得的边缘点拟合,求出一个区域的理想椭圆;然后将求得的理想椭圆与区域边缘点集合用近似度和逼近度两个指标拟合,得到与类椭圆区域最匹配的精确椭圆;最终得到类椭圆区域的边界轮廓,该轮廓可以很好地代替目标的真正边界。该算法可以快速检测完整椭圆和椭圆弧。