打造诚信汽修行业提高核心竞争力

诚信是建立和谐社会的重要基础,是市场经济体制下汽车维修行业的一种重要资源,也是决定行业能否持续、健康发展的关键性因素,更是汽车维修行业孜孜以求的目标。近年来,随着我国汽车工业和消费市场的快速发展,特别是私家车进入家庭,汽车维修行业与社会的关联度越来越密切,社会对汽车维修行业诚信建设的期望值也越来越高。因此,打造行业诚信品牌,是提高行业核心竞争力的必然选择。     

Application of the VOF method based on unstructured quadrilateral mesh

To simulate two-dimensional free-surface flows with complex boundaries directly and accurately, a novel VOF (Volume-of-fluid) method based on unstructured quadrilateral mesh is presented. Without introducing any complicated boundary treatment or artificial diffusion, this method treated curved boundaries directly by utilizing the inherent merit of unstructured mesh in fitting curves. The PLIC (Piecewise Linear Interface Calculation) method was adopted to obtain a second-order accurate linearized reconstruction approximation and the MLER (Modified Lagrangian-Eulerian Re-map) method was introduced to advect fluid volumes on unstructured mesh. Moreover, an analytical relation for the interface’s line constant vs. the volume clipped by the interface was developed so as to improve the method’s efficiency. To validate this method, a comprehensive series of large straining advection tests were performed. Numerical results provide convincing evidences for the method’s high volume conservative accuracy and second-order shape error convergence rate. Also, a dramatic improvement on computational accuracy over its unstructured triangular mesh counterpart is checked.     

反射波法测桩之桩底反射分析

在低应变反射波法动力测试中，在工地现场采得并准确差别桩底反射信号一直是基桩检测人员的最主要判释。通过对不同桩型及复杂地层中桩底反射的认识，可以帮助检测人员积累工程桩检测的经验，有助于提高检测水平。     

石煤挥发份产率的测定

以往石煤挥发份产率的测定旧一般煤的工业分析中挥发份测定法进行。石煤含碳量低，与一般煤碳不尽相同，故采用这种方法测定，结果不具有真实性。本拟实验找到一个较为合适的温度和时间，以适合于石煤中挥发份产率的测定。     

对非测绘专业测量学实践教学的讨论

测量学是一门实践性很强的课程，在教学中应对测量实践教学的内容及方法等有正确的认识，并对如何搞好测量实践教学做好总结、     

汽车空调的特点及新动向

介绍了汽车空调的驱动方式以及布置方式，综述了现代汽车空调用压缩机、冷凝器、蒸发器、膨胀阀等设备的特点、种类以及汽车空调替代制冷剂的研究动向。