应用无单元法,对渗流场和与应力场耦合作用下的岩体裂缝扩展进行追踪。裂缝扩展计算采用断裂力学最大周向正应力理论。应力场和渗流场的耦合作用通过以渗透压力和渗透系数为交互因子的迭代计算考虑,其中裂缝区还考虑了裂缝中水对缝壁的拖曳力。裂缝扩展计算每一步所产生的新结构都要进行渗流-应力耦合分析,直至裂缝稳定为止。算例结果表明,所建数值模型能较真实地反映水流对裂缝扩展的影响,并能较好地模拟渗流-应力耦合作用下
天然河道挟沙水流具有复杂的力学行为，随着含沙量的增大，挟沙水流能耗率也最大，但当含沙量超过某一临办值之后，能耗率则迅速减小，在这种微观层次上的复杂行为的影响下，河床形态和河
IoT is extensively used in everyday object and its popularity is increasing day by day. In this paper it includes the design and development of an IoT and mobil
Relay selection is an effective method to realize the cooperative diversity gain in wireless networks. In this paper, we study a threshold-based single relay se
As one of the top ten core industries in China, Internet of things, has gradually changed our life, by influencing enterprise production, storage and transporta
在水库大水体研究中引入Ｋ－ε模式，将水动力方程与水温水质方程耦合建模，合理考虑了水流运动与水温水质分布的相互影响。水质模型中描述了污染物运动变化的分子扩散、湍流扩散及弥
Over the last few years, the Internet of Things (IoT) has become an omnipresent term. The IoT expands the existing common concepts, anytime and anyplace to the
Rapid advances in electronics and communications technologies offer continuously evolving options for sensing and awareness of the physical environment. Many of
作者对有胸骨后疼痛和吞咽困难的患者，在胃镜下对病灶进行刷片、活检或真菌培养，经证实诊断为霉菌性食管炎20例，现分析报告如下。