IMPROVED MLV FILTER TO REMOVE MULTIPLICATIVE NOISE

More methods can be used to remove the additive noise, such as the Mean of Least Variance （MLV） filter. When the signal is noised by the multiplicative noise, it is difficult to remove. The paper presents an improved filter to remove multiplicative noise by changing the multiplicative noise to the additive noise, and then using the MLV-like to remove the additive noise. The simulation results show that the performance is better than Minimum Coefficient of Variation （MCV） filter and MLV filter. Both one-dimension and image experiments demonstrate its theoretical performance.     

中央亚洲活动带及邻区砂岩型铀矿床主要类型、铀成矿特征及在我国西北地区找矿方向的探讨

以产铀盆地所处大地构造位置、形成演化及铀矿化成因特征为基础,将中央亚洲活动带及邻区主要砂岩型铀矿床分为5种类型,分析了不同类型铀矿床的分布规律,对其产出构造地质背景和铀矿化特征进行了讨论,指出了我国西北地区盆地动力学的特征、主要找矿类型和含矿层位。     

斜键热处理裂纹分析

采用宏观、微观检验、显微硬度测定、化学成分分析、扫描电镜及能谱分析等方法,对45钢斜键产生裂纹的原因进行分析.结果表明:原材料存在严重的成分偏析是裂纹产生的主要原因.     

预应力锚固机理分析

预应力锚固技术在岩土工程边坡已经得到了广泛的应用，在工程实践中人们对其机理还没有深刻的认识。现就预应力锚索加固的特点，对预应力锚固技术处理措施的现状及发展方向加以探讨。     

SUPERCOOL织物与纯棉织物吸水透气性能比较

将SUPERCOOL短纤纱织成纬平针组织,并对织物进行染整处理,测试其基本结构特征参数,用毛细效应法和比利时UCB法来比较SUPERCOOL织物的吸水性能,测试分析其透气性能,并与同纤度纯棉针织物相比较。结果表明:SUPERCOOL织物具有优异的吸水及透气性能。     

Analysis of the Difference between Surface Area and Vertical Projection Area on Shaanxi Qinling Mountains based on DEM

Based on DEM of Qinling Mountains, used the model of the center cell and the adjacent eight cells, we calculated the surface area of Shaanxi section Qinling Mountains. The results shows that: (1) The surface area of Shaanxi section Qinling Mountains is 75 224.67 km², which is an increase of 22.04% from the vertical projection area；（2）The relation between the difference of surface area and vertical projection area and elevation is parabolic. The altitude of 2 000 meters is the area with the largest difference between the surface area and the vertical projection area in Shaanxi section Qinling mountains；（3）Compared with the vertical projection area, the area of low mountains, medium mountains and submountains in Shaanxi section of the Qinling mountains increased by 2 301.54 km², 6 181.67 km² and 691.60 km² respectively, with the growth rate of 10.68%, 18.37% and 18.25% respectively.（4）The difference between the surface area and the vertical projection area is various in different land use types. Not using land is the largest, the difference is 34%. The second is forest land which the difference is 28%, and the lawn is approximately 20%. Difference is small in farmland, other forest land, water and residents and industrial land, which is 12%, 8%, 5% and 8% in turn.     

推进全员绩效管理工作的探讨

通过分析绩效管理在企业的定位和容易出现的误区,提出了开展绩效管理的几方面原则、注意事项及应对措施。     

硅质脉型铀矿床地质特征及成矿机制探讨——以甘肃革命沟矿床为例

文章在介绍革命沟矿床区域地质成矿环境、矿床特征、热液蚀变、元素地球化学、含铀矿物学特征的基础上,分析了成矿物质来源、热液活动及成矿物质迁移途径,论述了硅质脉型铀矿床成矿机制。认为革命沟矿床的形成是地层-岩体-构造-热液活动共同控制的特定时空域内的客观产物,区域含铀建造是成矿的物质基础,成矿热液源自幔汁(HACONS),岩浆及期后热液是铀迁移的载体,铀成矿模式强调了硅质脉后期热液沉淀过程是成矿物质的富集过程。     

MK-121型甲醇合成催化剂的工业应用

陕西咸阳化学工业有限公司的甲醇合成工艺,采用丹麦托普索公司的MK-121型甲醇合成催化剂。介绍了MK-121的工业应用情况,结果显示,MK-121型甲醇合成催化剂初期活性、选择性、稳定性良好,中期活性衰减较快,末期活性和选择性明显变差,末期产品中蜡及杂醇显著增加。生产实践表明,MK-121型甲醇合成催化剂具有良好的活性、选择性及较高的碳效率,但活性衰减较快。     

基于Pro/E Mechanica Structure的塑料产品装配结构设计

以手机的装配结构设计为例,在分析其零部件的结构特点及卡扣连接、压力装配等装配关系后,借助Pro/E Mechanica Structure模块分析手机在装配中,手机前盖、后盖等塑料零部件在静载荷作用下可能出现的变形,进而改进并优化结构,并且对改进前后结构受静载荷作用的应力值进行比较,结果满足使用的力学性能要求.因此通过基于Pro/E Mechanica Structure的塑料产品装配设计,可以降低成本、加快完成塑料产品的开发.