基于小波变换和奇异值的人脸特征提取

在"基于奇异值特征的人脸识别新途径"的基础上,将小波变换和奇异值分解用于人脸识别的特征提取,更进一步地降低了特征向量的复杂度.实验证明,这种特征提取方法实现简单,识别率高,是一种有效可行的特征提取方法.     

汽车在低温条件下的使用与维护

寒冷的气候给汽车的使用带来诸多不利因素，本文主要介绍了低温对汽车造成危害及其车辆的防护措施。     

斜拉桥索塔稳定安全系数计算的能量法

通过对斜拉桥索塔稳定性计算进行分析，提出了一种适合于索塔稳定安全系数计算的能量法，利用该方法对洞庭湖三塔斜拉桥中塔稳定性计算分析表明：采用此方法计算斜拉桥索塔稳定安全系数可大大节约机时，并且结果具有很好的精度．     

MM—美特铁聚合金属陶瓷的试验研究与应用

本文介绍试验研究的一种新的高分子聚合材料－美特铁聚合金属陶瓷，并对其的技术性能，主要特点和应用进行了阐述。     

信息与火力一体化指挥控制系统效能评估

信息与火力一体化的指挥控制系统,是形成信息与火力一体化联合作战体系的核心,是生成一体化联合作战能力的关键环节。运用模糊综合评估的方法能对信息与火力一体化指挥控制系统效能进行有效分析。     

发展液化气船的技术要点与展望

本文从实用出发，对LNG船液货舱的三种舱型和三种LPG船型等技术要点分别作了较为详细的分析，并展望了液化气船的发展趋向。     

双浮体波浪能装置的振荡和能量转换特性研究（英文）

In this study, we investigated the hydrodynamic and energy conversion performance of a double-float wave energy converter(WEC) based on the linear theory of water waves. The generator power take-off(PTO) system is modeled as a combination of a linear viscous damping and a linear spring. Using the frequency domain method, the optimal damping coefficient of the generator PTO system is derived to achieve the optimal conversion efficiency(capture width ratio).Based on the potential flow theory and the higher-order boundary element method(HOBEM), we constructed a threedimensional model of double-float WEC to study its hydrodynamic performance and response in the time domain. Only the heave motion of the two-body system is considered and a virtual function is introduced to decouple the motions of the floats. The energy conversion character of the double-float WEC is also evaluated. The investigation is carried out over a wide range of incident wave frequency. By analyzing the effects of the incident wave frequency, we derive the PTO's damping coefficient for the double-float WEC's capture width ratio and the relationships between the capture width ratio and the natural frequencies of the lower and upper floats. In addition, it is capable to modify the natural frequencies of the two floats by changing the stiffness coefficients of the PTO and mooring systems. We found that the natural frequencies of the device can directly influence the peak frequency of the capture width, which may provide an important reference for the design of WECs.     

高速公路桥梁穿越煤矿采空区基础处理措施

结合成都—自贡—泸州高速公路施工情况,探讨高速公路桥梁穿越煤矿采空区基础处理措施,对于指导实际工作有一定的意义.