比较原理

This paper mainly introduces principle and structure of whisht magnetic field grid absoluteness coder,compares technical features of WMFGAC with like-sensers popular on the market,and uses WMFGAC to accomplish the purpose of monitoring and controlling the gate of small and middle-sized power station.

本文介绍了静磁栅绝对编码器的结构、原理，并与市场上流行的各种类似传感器进行了详细比较，得出静磁栅绝对编码器的技术特点，并利用静磁栅绝对编码器完成了中小水电站闸门的监测及控制过程。

In this dissertation, InGaAs/InGaAsP/InP MQW microdisk laser and its characterization were presented. Some conclusions are as following: the characteristics of lasing threshold was discussed by using rate equation. The dependent relations between threshold and cavity volume, spontaneous emission coupling efficiency β were investigated. The whispering gallery mode and spontaneous emission in a microdisk geometry were then studied. Almost all spontaneous emission was coupled into the lowest order TE mode when the normalized thickness of photonics well was between 0.15 and 0.5. The design principle and device process of InGaAs/InGaAsP/InP MQW microdisk laser were presented. The microdisk lasers with the diameter of 8μm, 4. 5μm and 2μm were succesfully fabricated by using etching techniques. The pulse lasing thresholds for the microdisk with the diameter of 8μm and 4. 5μm were 170μW and 15μW, a record results compared with the published in the literature. The cw lasing threshold for a 2-μm-diameter microdisk was only a few μW. We haven't found similar report up to now. To solve the problem of directional output in a microdisk laser, the power coupling efficiency in a double disk geometry was investigated with the theory of waveguide mode couple. A new structure of electrically pumped microdisk laser with output waveguide was designed, making a foundation for the practical use of microdisk laser.

本文主要研究InGaAs/InGaAsP/InP多量子阱半导体碟型激光器的研制和特性表征，并取得如下结果：利用速率方程理论讨论了激光器激射阈值的特性，分析了阈值与腔体积和自发发射耦合系数β之间的关系；讨论了微碟光子阱结构中的自发发射特性和微碟中WGM模式特性；光子阱结构在其归一化厚度在0.15-0.5之间时，几乎全部自发发射进入到最低阶TE模式中；研究了InGaAs/InGaAsP/InP多量子阱微碟激光器的结构设计原理和器件的制备工艺；利用刻蚀方法成功制备出直径分别为8μm、4.5μm、2μm的碟型微腔激光器；直径8μm和4.5μm的微碟脉冲光泵浦激射阈值分别为170μW、15μW，是目前所见文献报导中比较低的；直径2μm的微碟连续光泵浦激射阈值仅几μW，目前尚未见到达到类似结果的研究报导；为解决微碟激光器激射光定向引出的问题，通过波导耦合模理论分析了双层碟之间功率耦合效率；据此设计了新型带耦合输出波导的电泵浦微腔激光器，为进一步研制可实用的电泵浦微腔激光器打下基础。

A new production technology,using witherite,hydrochloric acid and industrial refined salt as raw materials,to produce liquid barium chloride with low strontium by crystallization method was put forward.

比较了氯化钡的各种生产方法，提出了以毒重石、盐酸和工业精制盐为原料，结晶法生产液体低锶氯化钡新工艺，并对酸化反应、锶钡分离原理、饱和盐水洗涤及母液处理进行了分析和讨论。

The basic principles and main techniques of image data compression are presented in this article. The zerotree coding method and zero filling of rectangular block coding method are compared.

本文首先介绍图像数据压缩的基本原理和几种常见的图像压缩编码方法，比较了零树编码方法和矩形块填充编码方法的优缺点。

In addition to particular introduction of the ANSYS optimal analysis technique's fundamental、basic concepts and optimal analysis flow, the paper also compares the merits and flaws of zero order and first order optimal analysis method.

详细介绍了ANSYS优化设计技术的基本原理、基本概念，以及优化分析流程，比较了零阶优化分析方法和一阶优化分析方法的优缺点。

According to the principle of optical square matrix, we produced a economical, useful and acurative RC-1 device which can automatically count the rotational figures of the rat PD models.

应用光电矩阵原理研制成功了经济实用、精确度比较高的RC—1型大鼠旋转自动计数仪。

This paper introduces the fundamental principle of smoothness and prediction in use of grey theory in passive angle tracking, and constitutes the module of smoothness and prediction based on the grey algebraical curve model.

介绍了利用灰色理论在无源角度跟踪中进行平滑预测的基本原理，建立了基于灰色代数曲线模型的平滑预测模块，并通过计算机仿真说明灰色代数曲线模型较灰色微分方程等其它几种模型更适合于无源角度跟踪中的平滑预测，并就几种模型的应用范围作了比较。

The technological process in preparation of the delafossite structure p-TCO thin films by sol-gel method is discussed systematically. The relative advantages and disadvantages of the systems of sol about organic alkoxide and inorganic salt are analyzed, and further development are discussed. It is pointed out that sol-gel method is an effective and feasible means to prepare p-TCO thin films.

本文介绍了铜铁矿结构p-TCO的结构特性以及溶胶凝胶法的基本原理和特点；系统地介绍了溶胶凝胶法制备铜铁矿结构p-TCO薄膜的工艺；分析比较了有机醇盐、无机盐溶胶体系的优缺点；最后讨论了进一步的发展方向，指出溶胶凝胶法是一种高效可行的制备p-TCO薄膜的方法。

The mechanism of linear regression analysis, decomposing of Shukla interactive variance method, and AMMI model were introduced as crop varieties stability analysis methods in crop regional trials.

介绍和比较了直线回归法、Shukla互作方差分解法和AMMI模型法在作物区域试验中分析品种稳定性的原理和方法，并以长江流域棉花品种区域试验的产量数据为实例，研究了3种方法对品种稳定性分析的效果。

Firstly, this paper compares several methods often used to remove scale in industry application, then analyzes and introduces the antiscale mechanism and structure of ultrasonic descaler, and lastly uses detailed cases to verify the antiscale effect of ultrasonic descaler in different environment and usage. The spreading of this product has significant value in environment protection, saving energy, improving efficiency and reducing cost, etc.

本文首先比较了工业生产应用中常用的几种不同的清垢方法，并对超声波防垢器的防垢机理、原理结构进行了分析和介绍，最后通过各种详实的使用案例资料，有效地证实了超声波防垢器在不同环境和用途中的防除结垢效果，其推广价值在环保节能、提高工效、降低成本等诸方面具有广泛的意义。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。