小波变换去噪方法在无线电引信信号处理中应用的研究

介绍了小波变换的原理和基于门限值的小波去噪方法,讨论了傅里叶分析与小波分析方法.针对模拟产生信号和试验测得的导弹含噪声回波信号分别用FFT分析方法和小波分析方法进行信号噪声消除.仿真结果表明,基于小波变换的去噪方法与传统的傅里叶分析方法相比,具有较高的精度和较快的速度.     

离子注入硅的连续激光退火研究

离子注入造成的晶格损伤,在半导体应用中有截然相反的两种作用。制造器件的pn结需要消除损伤,     

韶关旅游气候环境及其变化分析

气候环境是一个地区旅游业发展的基本因素,文章利用韶关多年的气象统计资料,通过对各气象要素的统计分析和对有效温度的计算,定量分析了韶关市旅游气候环境,得出该市旅游气候条件的特点.在此基础上分析近55年旅游气候环境变化及其成因,为全面合理地开发利用韶关旅游气候资源提供科学依据.     

铝酸酯在粉煤灰微珠表面上偶联机理的研究

提出了铝酸酯偶联剂在粉煤灰微珠表面的单分子层模型，并用红外光谱、扫描电子显微镜等分析，证实了铝酸酯与粉煤灰微珠是通过化学键实现界面偶联的。     

未燃烧煤粉对焦炭粉化性能的影响

为了弄清楚高炉内未燃烧煤粉（简称ＵＰＣ）对焦炭性能的影响，我们在实验炉内做了纯焦炭恒温处理，气化反应以及焦炭层喷吹ＵＰＣ后气反应一小时后焦炭样的粉化情况，得出的主要结；（ａ）同一温度条件下，纯焦炭气化反应一小时粉化最严重，而焦炭层喷吹ＵＰＣ后粉化程降低；（ｂ）同一温度条件下，随着焦炭层喷吹ＵＰＣ量的增加，气化反应后焦炭的强度提高，粉末量减少。     

一类修正离散指数型线性算子及其在LP（—∞,∞）中的逼近阶

本文给出一类离散指数型线性积分修正插值算子,而且借助Cauchy主值积分给出了其在L_p(-∞,∞)中的收敛速度。     

A STUDY OF THE TRIBOLOGICAL PROPERTIES OF NITROGEN-IMPLANTED GCr15 BEARING STEEL AND 40Cr STRUCTURAL STEEL

Friction and wear properties of nitrogen-implanted GCrI5 bearing steel and 40Cr structuralsteel were studied under different implantation conditions. It is found that physical and mechani-cal properties, as well as chemical properties of the surface layer are greatly changed by ionirradiation, such as the decrease of surface roughness, the increase of hardness accompanied withthe occurrence of compressive stress, etc.. The results of SEM and Ferro-spectroscopy show thatthese variations in surface properties closely associated with changes in the microstructure causegreat variations in friction and wear conditions, and mechanisms between implanted andunimplanted specimens. Changes in the surface microstructure with iron implantation were identi-fied by Auger electron spectroscopy, transmission electron microscopy and X-ray photoelectronspectroscopy. By means of the orthogonal experiment method, test results for each differentimplantation condition and original hardness of the materials under the same wear test conditionwere comprehensively analysed and discussed.     

THE THINNING EFFECT OF ION IMPLANTATION

In this paper,we shall study in detail the change regularities of surface roughness parameters intwo and three dimensions under some implantation conditions.And a computer is used to calcu-late and analyze the topographies of the surfaces before and after ion implantation,therefore themechanism of the changes of surface topographies and that of wear resistance after implantationscan be understood further.     

脂肪酸加氢催化剂的制备与性能研究

一种用于从植物油皂脚提取的混合脂肪酸的加氢反应的新型催化剂已研制成功,定型为HS-1型催化剂。它是以氧化硅为载体的镍催化剂,其生产原料立足于国内。测试表明,HS-1型催化剂的加氢活性与进口催化剂相当,而对不同来源的混合脂肪酸的适应性好于进口催化剂。