Image hiding scheme with modulus function and dynamic programming strategy on partitioned pixels

In this paper, we shall propose a novel image-hiding scheme. Our new scheme classifies the host image pixels into two groups of pixels according to the pixel values. For each group of pixels, the corresponding secret pixel values go through an optimal substitution process and are transformed into other pixel values by following the dynamic programming strategy. Then, we can embed the transformed pixel values in the host pixels by using the modulus functions and obtain the stego-image. Extensive experimental results demonstrate that our new method is capable of offering better stego-image quality than a number of well-accepted schemes.     

粗集料中心质效应的一些探讨

本文从中心质效应理论角度，利用弹性力学初步分析探讨了单轴受拉，受压时粗集料的一些中心质效应问题。     

力学探针在材料选区力学性能测量上的应用

介绍了力学探针的工作原理，并通过对不同应力状态下弹簧钢力学性能和TiN硬质薄膜力学性能的测量实例，展示了力学探针技术在材料选区力学性能评价上所具有的明显优势和广阔的应用前景。     

基于民族传统文化的平面设计模数体系的构建研究

现代设计普遍存在功能至上,千篇一律,随着经济的发展生活节奏的加快,以及西方设计思想的渗入,致使现代设计普遍存在形式上的模仿,内容上空乏,忽视了华夏五千年的历史文明,中国传统民族文化历史源源流长,对现代设计的发展有极其重要的影响,把传统民族文化在利用到现代设计中显的至关重要.形成一定的规范秩序化的体系是现代设计的重要需求.     

Nanoindentation Measurements of the Mechanical Properties of Ni Thin Films: Effects of Film Microstructure and Substrate Modulus

This paper presents the results of nanoindentation measurements of the hardness and moduli of normally and obliquely deposited nanocrystalline Ni films on substrates of SiO₂, Si, and bulk Ni. Following an initial characterization of film microstructure and surface topography with atomic force microscopy (AFM), the paper examines the effects of film microstructure, film thickness, and substrate modulus on the measured film mechanical properties. Obliquely deposited films are shown to have lower hardness values than normally deposited films. The measured hardness values and material pile-up are also shown to depend significantly on the mismatch between the film modulus and substrate modulus. A framework is presented for quantifying the effects of substrate modulus mismatch on basic film mechanical properties.     

适用于高阶QAM系统的多模盲均衡新算法

利用QAM信号星座图特点,该文提出了两种含软判决的多模盲均衡算法:MMA+SDD算法和SMMA+SDD算法。两种算法都克服了CMA算法剩余误差大的缺点,在均衡的同时能够克服相位偏转。从仿真结果看,两种新算法的收敛性能和稳态均方误差较CMA+SDD有了进一步提高,其中,MMA+SDD收敛性能最佳,SMMA+SDD的计算复杂度最低。     

添加纳米SiO2粉体对Ti84Mo16合金性能优化的探索

针对"骨置换"材料的高强度、低弹性模量需求,基于粉末冶金制备工艺,对钛钼Ti84Mo16二元粉采用2 h球磨,然后在球磨粉中添加比例分别为1%、2%、5%纳米级SiO2粉后压坯成型,并在1 200℃条件下保温5 h固相烧结制备合金。研究发现,在Ti84Mo16合金中添加不同比例的SiO2后,其屈服强度提高17.92%,断裂强度提高5.8%,但合金塑性降低,弹性模量没有增加,依然与"骨置换"材料要求所匹配。     

IC缺陷轮廓多分形特征研究

IC真实缺陷轮廓曲线的形状特征对集成电路成品率预报及故障分析有重要影响。该文提出缺陷轮廓曲线具有多分形特征,以某一真实缺陷为例,用小波变换模极大(WTMM)的方法估计了其轮廓曲线参数方程的多分形谱,该结果为硅片表面缺陷的精细表征及其计算机模拟作了有益探索。