| 1. | Examples show that the envelope method to evaluate scales of thermal pollution can be applied to assess the engineering design and environment
算例表明，包络图的方法评价温升影响范围，能够为工程设计和环境评价提供依据。 |
| 2. | The results indicate that the envelope method is more effective in actual application . and the recording distance limitations due to the stated pixel number , pixel size and laser wavelength are discussed in detail
通过对图像采样的分析，结合采样定理，给出了当图像像素总数、像元尺寸、记录波长都确定时，对衍射距离的限制条件。 |
| 3. | ( 5 ) digital holograms of static particles and particle field ( multi - layer ) are recorded in the experiment . and the reconstructed particle images are gained using the envelope method with two different reconstructed waves - plane wave and spherical wave , respectively
( 5 )从实验上拍摄了单层静态粒子靶和多层静态粒子靶的数字全息图，并分别用平面波和球面波实现了该模拟粒子场的数值再现，得到了清晰的粒子像。 |
| 4. | Abstract : this article discussed the causes of errors in nc program of machining screw using non - instant center envelope method . an analytical method to check the accuracy of nc program has been given , thus the theory basis of improving nc program has been provided in this article
文摘:对目前常用的无瞬心包络法螺杆加工数控程序中产生误差的原因进行了分析研究，提出了一种校验数控程序精度的分析方法，为改进数控程序提供了理论依据。 |
| 5. | The main contents of this thesis are : ( 1 ) two numerical reconstruction methods - direct fourier transform method and envelope method , are presented . these methods are deduced on the base of fresnel diffraction integral formula , which is under the condition that particle field is illuminated by plane wave
主要工作内容有： ( 1 )分析推导了平面物菲涅耳衍射的两种常用数值实现算法，即直接傅里叶变换法和卷积法，结论表明后者更符合实际工作的要求。 |
| 6. | Mtcem ( multi - tone envelope method ) can accurately forecast performance parameters on a set of stored channel and directly decide usable frequency choice . as hf channel characteristic is closed to gauss , mtcem may be simplified to multi - tone envelope method rtce system . for certain user ' s request and link status , double tone complex envelope method rtce , double tone envelope rtce , adaptive hf channel sounding and communication system , all that can easily derived from mtcem
多音复包络实时选频系统，当信道特性近似于高斯信道时，整个系统可以简化为多音包络法实时选频系统，针对不同的用户要求和电路信道状况，很容易由它派生出较为简单的系统，如双音复包络法实时选频系统，双音包络法实时选频系统，短波自适应信道探测和通信系统。 |
| 7. | Based on object - oriented analysis and design , this paper discussed the basic theory of computer graphics , visual simulation method , non - instantaneous pole envelope method about cnc machine and the three - dimension graphics modeling method . with triangle graphic element as the basic modeling tool we developed simulation system that cnc machine manufactured special shape screw pole
本文以面向对象分析和设计为基础，对计算机图形学基本理论、可视化仿真方法、数控机床无瞬心包络加工方法和三维图形造型方法进行研究，利用三角形图元作为基本的造型工具，建立了数控机床加工异形螺旋杆的仿真系统。 |
| 8. | Rtce is based on forecasting the inherent vulnerabilities to propagation of hf time - varying channel , including multipath delay , doppler spread , selective fading , interference , so this paper also introduces characteristics of hf channel in the beginning . familiar rtce systems all adopt envelope method that bello brought forward
实时选频技术是基于对短波电离层时变信道固有的不利于电波传播的各种因素，包括信道的多径展宽、多普勒展宽、选择性衰落、噪声干扰等的预测的基础上实现的，所以在开篇对短波信道的特点进行了详细的介绍。 |
| 9. | ( 2 ) the denoising principle and method based on wavelet transform are applied in underwater target signal . it has been proved through computer simulation that the effect of noise reduction is much better by using multiwavelets than single wavelet . ( 3 ) wavelet theory is applied to envelope analysis and wavelet envelope method is discussed in detail
探讨了基于小波变换消噪的基本原理和基于小波变换去噪的基本方法；对标量小波和向量小波信噪分离方法分别进行了仿真，结果表明，向量小波信噪分离方法能更好的去除信号中的噪声。 |
| 10. | However , the technology of manufacture about helical rotor is always the key problem , which blocks its development off since 1994 , the cnc research center in shenyang university of technology has pursued research on complex special helical pole . it firstly put forward the non - instantaneous pole envelope method in china , and pursued systemic research on the theory of envelope method and nc programming method , then acquired a lot of achievements . therefore in this thesis the main job is the simulation model built on basis of non - instantaneous pole envelope method and the three - dimension graphic dynamic simulation system
从1994年起，沈阳工业大学数控研究中心即对复杂异形螺旋面加工进行攻关研究，在国内首先提出了无瞬心包络加工方法，并对其包络加工原理、数控编程方法等多方面进行了系统的研究并取得了一定成果，本文的主要工作即是以无瞬心包络法加工过程为基础建立的仿真加工模型和三维图形动态仿真系统。 |
