准实验研究

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。

ABSTRACT Based on the experimental study on spray characteristics in D. I. diesel engine using gaseous jet simulation and high speed shadowgraphy techniques, a quasi—dimentional multi—zone combustion model for small and medium D.

以用气体模拟法和高速激光阴影法对直喷式柴油机燃油喷雾特性进行的实验研究结果为基础，本文建立了一个适用于中小型直喷式柴油机的准维多区燃烧模型。

The recognition of quasi-periodic excitation source method is introduced. Using this method, the experiment is made to extract the glottal waveform from the voiced sound.

提出了一种准周期激励源识别的方法，并利用该方法对浊音语音信号中声门波的提取进行了理论与实验研究。

ABSTRACT In this paper, homonuclear rare gas ionic excimer-Ar〓 was studied and promoted both theoretically and experimentally.

本文对同核稀有气体Ar〓离子准分子进行了深入的理论和实验研究，取得了新进展。

Second, to conduct a quasi-experimental design using nonequivalent groups to study the effects of adaptive pointer during math-learning.

第二，我们实作了一个不等组前后测的准实验设计来研究适性指标在数学学习的效果。

A more precise QDM is developed for simulating the working process of swirl chamber diesel engine, based on a series of tests.

本文在实验研究的基础上，发展和完善了涡流室式柴油机稳态工作时的准维燃烧模型和计算程序，使该模型和模拟计算结果进一步精确化。

The increase rate of strength, range of quasi-solid and failure strain of quasi-solid A1-5%Cu alloy during soliamcation are investigated with special apparatus. The influence of B,Ti, salt-refiner and mischmetal on the mechanical properties is also studied.

采用自制实验装置研究了A1—5％Cu合金在凝固过程中的准固态强度、强度增长率、断裂应变以及B，Ti，盐类细化剂和富Ce混合稀土对合金准固态力学性能的影响。

The creative-thinking strategies such as SCAMPER、brainstorming、attribute listing and synectics were used to guide members in the experimental group to conceive the idea of vector drawing.

研究设计采不等组前后测准实验设计，实验组和控制组皆先进行相同的向量绘图技能教学，待两组学生在「专业」成分具相同基本技能后，实验组施以「创思向量绘图教学」，在引导构思时，导入SCAMPER、脑力激荡、属性列举法及分合法等创造思考策略，控制组则以范例作品欣赏及全班问与答的方式进行引导。

Measurements are also carried out in various distances by moving detector to determine the collimated transmission using very thick sample based on the scattered transmission of tissue is isotropically distributed over all angles.

同时在验证大块组织体透射光亮度空间分布近似各向同性的基础上，理论上提出一种通过移动探测器测量大块组织体的准直透射率的方法，并进行了实验研究。

The 0.5-scale water model based on Froude number similitude criteria was set up to experiment.

然后基于相似原理，利用修正的Froude准数相等，选取比例系数为1：2缩小比例模型进行实验研究。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。