原理

Based on the principle of cross correlation, a improved method for the velocity measurement of two-phase flow .

本文在互相关测速原理的基础上，提出了一种改进的方法，即运用差动自相关测量原理，对两相流流速进行测量。

Furthermore, this theory is built on the equivalence principle and the principle of the generalized covariant basic assumptions on which the two.

进一步说，这个理论是建立在等效原理及广义协变原理这两个基本假设之上的。

Chaper 3 is general description of ADA encryption. Chapter 4 deals with the transform domain encryption. Includes the element of perfect and quasi-perfect transform domain encryption, and presents two type new schemes. Chapter 5 deals with asynchronous ADA encryption. Extends the general theory and model of asynchronous ADA scrambling, and introduces two type phase-distortion-free a synchronous ADA schemes. Chapter 6 is about new direction of ADA encryption. Includes TASI scrambling, transform domain dummy insertion scrambling, noise coving scrambling and other multi-dimension ADA scrambling, and proposes an adaptive dummy spectrum insertion asynchronous scrambling and a new adaptive noise-coving DFT scrambling algorithm. Chapter 7 is on permutation key. presents part results on permutation features, selecting criterion and constructing method. Chapter 8 introduces the hard and software design of a common ADA encryption/decryption system, and presents the experimental results on several proposed ADA encryption schemes.

第一章为绪论；第二章为语声信号、及其处理基础；第三章为模数模加密的一般描述；第四章为变换域加密研究，包括变换域加密机理，变换域完善与准完善保密研究，提出两种新的变换域加密方案；第五章为异步模数模加密研究，扩充了异步模数模加密的一般理论，介绍了两种新的无相位失真异步加密方案的原理与实现方法；第六章对模数模加密新方向：TASI应用途径、变换域伪谱插空置乱、噪声掩盖、多维置乱加密的原理和方法进行介绍，提出了自适应伪频插空异步模数模置乱算法与自适应DFT系数噪声掩盖置乱新算法；第七章为置换密钥性质、筛选准则以及构造方法研究的部分结果；第八章介绍了通用模数模加/解密实验系统的硬件、软件研制概况，并给出了几种加密方法的实验结果。

In order to improve the NGL recovery rate for some condensate gas fields, which had high pressure gas source and there was no differential pressure for utilization, this paper put forward a cryogen refrigeration-oil absorption combination process to recover NGL on the basis of cold oil absorption theory.

为了进一步提高天然气凝液装置的产品收率，本文针对凝析气田中气源压力高，无压差可利用的工况条件，应用冷油吸收原理，通过工艺流程模拟分析与研究，确定了冷剂制冷－油吸收复合凝液回收工艺原理流程。

This paper analyses the theory of how curve ball is played,and presents the essentials and the way of grasping them.

本文用力学定律分析了弧线球形成的原理，并根据这一原理提出了弧线球的动作要领和训练方法。

In this paper,a cutting method of machining straight slot-parts is mainly researched by using the principle of cycloid .

本文主要研究利用摆线原理加工直槽的方法，从理论方面证明利用摆线原理加工直槽的可行性，并且基于VER ICUT仿真平台实现了直槽类零件的连续切削的动态加工仿真

The paper expounds the principle and advantages of disinfection by UV-C radiation, introduces the relative technologies and products at home and abroad, designs elliptic and parabolic cylindroid lampshade of bank paper disinfection apparatus with \! equal path surface \ principle.

论述了紫外C辐照杀菌消毒原理、优点，介绍了国内外有关技术和产品状况，并以"等光程面"原理设计了纸币紫外C消毒器光源的抛物柱面灯罩和椭圆柱面灯罩。

The studyshows that Chetaev's model for mechanicalsystems with non-holonomic con-straints can be reduced to three essential factors:(1)a kind of direct sum ofjet bundles according to the constraints,(2)D′Alembert's principle,(3)pos-tulate of ideal constraints.The first among the three factors only has geomet-ric significance and the second is a fundamental physics principle independentof any constraints.

研究表明，非完整约束力学系统的Chetaev模型归结为三个要素：(1)射丛按约束的直和分解；(2)D′Alembert原理；(3)理想约束条件，其中(1)仅具有几何意义，(2)为与约束无关的基本物理原理，而(3)是对约束力学系统的限制条件。

The principle of her daffodil garden taught is one of the greatest principles of celebration.

她的'水仙花园'原理教导，就是其中一个最伟大的庆祝原理。

The equation was solved on the basis of the theory of forced damped vibration and variation principle.

再由受迫阻尼振动原理和变分原理推导出耳膜振动方程。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。