基于Fibonacci变换的音频相位水印算法

本文将Fibonacci变换作为一种水印预处理方法,和传统的相位水印方法结合,提出了一种基于Fibonacci变换的音频相位水印算法,改进后的算法和传统算法相比具有更好的鲁棒性．     

Physical modeling of hole mobility in silicon inversion layers under uniaxial stress

A physical model for hole mobility under either biaxial or uniaxial stress has been developed. The six-band k ? p theory is used to obtain the bandstructure through stress-dependent Hamiltonian. The hole mobility in the silicon inversion layer is studied in details using Monte Carlo method. A numerically robust method has been applied to achieve self-consistent solution of Poisson’s and Schrödinger equations.     

Sintering and dielectric properties of Al2O3 ceramics doped by TiO2 and CuO

The effects of CuO and TiO₂ additives on the microstructure and microwave dielectric properties of Al₂O₃ ceramics were investigated. Al₂O₃ ceramics with CuO and TiO₂ additions can be well sintered to achieve 93∼98% theoretical densities below 1,360 °C due to Ti₄Cu₂O liquid phase sintering effect. The Qf values decreased with increasing CuO and TiO₂ content, due to the formation of the second phase Ti₄Cu₂O. However, the varying behaviors of the dielectric constant (ɛ _r ) and temperature coefficients (τ _f ) were associated with phase constitutions, as a result of the change of CuO and TiO₂content. The τ _f can be shifted close to 0 ppm/°C by controlling the content of CuO and TiO₂. The specimens with 0.5 wt.% CuO and 7 wt.% TiO₂ sintered at 1,360 °C for 4 h showed ɛ _r of 11.8, Qf value of 30,000 GHz, and τ _f of −7 ppm/°C.     

中国观赏石

将中国观赏石分为造型石、纹理石、矿物晶体、古生物化石、事件石、纪念石及文房石７种类型。并阐述了各类观赏石的基本特征、鉴赏标准、国内外贸易特点及其开发前景。     

横观各向同性弹性力学问题的通解

本文引入三个位移函数来表示位移，首先证明了这种表示的可能性，然后逐步推导了运动方程的通解，得到了胡海昌解和另一形式的解。最后对球面各向同性弹性力学问题的能解作了补充研究。     

激光防护塑料制备和性质的研究

本文采用六氯化钨与磷酸三丁酯反应，合成了一种新型近红外吸收剂，将其掺入到甲基丙烯酸甲酯（MMA）中，成功的制各出一种在可见光透过率高、在1．06μm波长处有强烈吸收作用的防1．06μm波长激光塑料，在此基础上，还制得防0．53μm、1．06μm等多波段激光波长的新型激光防护塑料。     

基于COM+的组件负载平衡的研究

为解决应用服务器因大量访问,导致单个服务器不能承受的问题,提出了一个基于COM 组件的负载平衡模型来解决这个问题。该模型可以合理分配群集内服务器,让所有服务器共同合理分担业务处理请求。将此模型应用于某账户管理系统中,也取得了较好的平衡负载作用。     

基于变点方法的软件可靠性分析

简述软件危机及其引发的软件可靠性问题,讨论软件可靠性的变点分析理论,结合Schneidewind模型提出软件可靠性变点分析的极大似然方法,并将其应用于一个实际的软件失效数据集,采用积分变换的U-图准则进行检验,结果证明了该软件可靠性变点分析方法的有效性和统计意义.     

开发利用校友资源 有效促进大学生就业

校友资源是高校的一种特殊资源和宝贵财富,具有丰富性、潜在性、可持续性和经济性等特性。提出了高校合理开发和充分利用校友资源,有效促进大学生就业的对策。     

Physico-chemical properties and microstructure of hydroxyapatite-316L stainless steel biomaterials

Sintering shrinkage, compressive strength, bending strength, metallurgical morphology, microstructure and chemical composition diffusion of hydroxyapatite-316L stainless steel(HA-316L SS) composites were investiga-ted. The results show that the sintering shrinkage of HA-316L SS composites decreases from 27.38O/6o to 8.87% for cylinder sample or from 27.18% to 8.62% for cuboid sample with decreasing the volume ratio of HA to 316L SS,which leads to higher sintering activity of HA compared with that of 316L SS. The compressive strength of HA-316L SS composites changes just like parabolic curve (245.3→126.3→202.8 MPa) with reducing the volume ratio of HA to 316L SS. Bending strength increases from 86.3MPa to 124. 2 MPa with increasing the content of 316L SS. Furthermore, comprehensive mechanical properties of 1.0：3.0 (volume ratio of HA to 316L SS) composite are optimal with compressive strength and bending strength equal to 202. 8 MPa and 124. 2 MPa, respectively. The microstructure and metallurgical structure vary regularly with the volume ratio of HA to 316L SS. Some chemical reaction takes place at the interface of the composites during sintering.