可变式扩底支盘注浆灌注桩的控制与检测

介绍了可变式扩底支盘注浆灌注桩的技术优势，并通过具体事例，对可变式扩底支盘注浆灌注桩的承载力和桩身完整性作了检验测试，得出可变式扩底支盘注浆灌注桩可满足工程上高层建筑承载力高、沉降低的要求的结论。     

再论声波透射法检测灌注桩的声学原理

简述了用声波透射法检测灌注桩完整性的声学原理;分析了混凝土的质量、匀质性及缺陷等与声速、波幅和波形等声学参数之间的相关关系及一般规律;提出了首波波幅的识别与追踪方法及其适用性。     

食品表面质量的视觉检测方法研究

根据食品表面质量的检测要求,提出了利用视觉检测技术实现食品表面色泽、单元完整性、表面花纹清晰性及露馅等项目的检测,把图像的灰度均值、斑点面积和局部阈值分割结果等作为图像特征,实现各项目客观、定量、准确和快速的检测。     

七号信令网的A／B平面划分问题及其启发式解法

七号信令网拓扑优化中存在高级信令转接点(HSTP)的A/B平面划分问题,其可归纳为一类新的图的划分问题.该问题被证明难度是NP完备的,神经网络、遗传算法和模拟退火等启发式算法被应用于该问题的求解.为了算法的可比性,精心设计了试验方案,计算结果显示遗传算法和模拟退火可以很高的概率和效率搜索到该问题的最优解.     

On the completeness of meshfree particle methods

The completeness of Smooth Particle Hydrodynamics (SPH) and its modifications is investigated. Completeness, or the reproducing conditions, in Galerkin approximations play the same role as consistency in finite-difference approximations. Several techniques which restore various levels of completeness by satisfying reproducing conditions on the approximation or the derivatives of the approximation are examined. A Petrov–Galerkin formulation for a particle method is developed using approximations with corrected derivatives. It is compared to a normalized SPH formulation based on kernel approximations and a Galerkin method based on moving least-square approximations. It is shown that the major difference is that in the SPH discretization, the function which plays the role of the test function is not integrable. Numerical results show that approximations which do not satisfy the completeness and integrability conditions fail to converge for linear elastostatics, so convergence is not expected in non-linear continuum mechanics. © 1998 John Wiley & Sons, Ltd.