Geometry and Inductive Reasoning

As a child you learned by experimenting with the natural world about you．You learn ed how to walk,talk,and hold your spoon, all by trial and error．After many tries,you e ventually learned how to ride your bicycle, discovering it was easier to keep your balance     

Geometry in Nature and Art

Nature displays an infinite array of geometric shapes from the small atom to the greatest of the spiral galaxies, crystalline solids, the honeycomb of the bee, snowflakes, the arrangement of seeds on sunflowers and pinecones, the spiral of the nautilus shell, the spider's web, and the regular polygons found in the basic shapes of many flowers are just a few of nature's geometric masterpieces.     

Ce~(3+)∶LiCaAlF_6紫外激光器的研究

报道了利用Nd∶YAG四倍频266nm脉冲激光端面泵浦Ce∶LiCAF晶体,采用平凹谐振腔,输出296nm波长紫外激光.当输出镜透过率为20%,入射泵浦能量为13.5mJ时,获得最大输出激光脉冲能量为270μJ,脉冲宽度为3.4ns,输出激光峰值功率为79.4kW,光-光转换效率为2%,斜效率为1.6%.     

各种实际光束的M~2参数特性比较

首先证明基模高斯光束具有最小的Ｍ~２值，进而讨论了多模激光束、部分相干光束和波前畸变光束的Ｍ~２值的特性，以及相互之间的关系。     

超电大复杂目标RCS缩比模型预估方法

本文提出用缩比模型计算电大目标雷达散射截面（RCS）的理论。通过复杂目标近远场电磁散射理论模型的分析得到，目标的雷达截面和目标的几何尺寸及工作波长有关系。当电尺寸相同时，目标雷达散射截面和其几何尺寸的平方成正比，缩比模型计算既适用于近场，也适用于远场。     

新一代视频编码标准H．264／AVC的特点及应用

1H.264/AVC的诞生过程及其背景作为最新一代的视频编码标准,H.264/AVC是国际电信标准化部门(ITU-T)和规定MPEG标准的国际标准化组织/国际电工协会(ISO/IEC)共同制订的一种基于块的活动图像编码方式的国际标准格式,也被成为MPEG-4AVC或者MPEG-4Part10。H.264/AVC的诞生,是为了满     

Theoretical analysis of nanosecond crystallization kinetics of phase-change optical recording films

A theoretical investigation of nanosecond crystallization kinetics of the phase-change optical recording films is presented. An extended Kissinger equation for the square-root heating is derived, which properly describes the temperature evolution of the films by nanosecond laser heating. The extended Kissinger equation was used to explain our previous experimental results.     

西门子SIMOTION D在高速纸箱包装机上的应用

本文详细介绍了西门子SIMOTION D在高速纸箱包装机上的应用。SIMOTION作为西门子新。代运动控制器增加了很多实用的功能，降低了使用者的编程难度，在一些控制要求较高的机械上可以真正体现出它的优势。     

便携式复印机结构设计

论述便携式复印机结构总线设计原则以及内结构件的着急件机芯，传动系统的设计参数。     

Deductive Reasoning

There are two types of reasoning in mathematics:inductive and deductive reasoning．You have been using inductive reasoning by observing patterns and making conjectures about your observations．This is the creative,investigative form of reasoning that mathematicians use most often．In the coming chapters,you will take a look at other fom of reasoning,deductive reasoning,to see if your discoveries are logically consistent．