Sonic velocity in holographic fluids and its applications

Gravity/fluid correspondence acts as an important tool in investigating the strongly correlated fluids.We carefully investigate the holographic fluids at the finite cutoff surface by considering different boundary conditions in the scenario of gravity/fluid correspondence. We find that the sonic velocity of the boundary fluids at the finite cutoff surface is critical in clarifying the superficial similarity between the bulk viscosity and perturbation of the pressure for the holographic fluid, where we set a special boundary condition at the finite cutoff surface to explicitly express this superficial similarity. Moreover, we further take the sonic velocity into account to investigate a case with a more general boundary condition. In this more genaral case, although two parameters in the first order stress tensor of holographic fluid cannot be fixed, one can still extract the information about the transport coefficients by considering the sonic velocity seriously.     

使用ADC作单片机键盘接口

详细介绍了利用AD转换器扩展单片机键盘的2种方法，并对这两种方法进行了分析和比较。这种方法实现简单．节省单片机资源，在智能仪表应用中具有实际意义。     

南京市针灸诊室内空气品质现状测试与研究分析

中医针灸室会因燃烧产生大量的颗粒物,从而影响人们健康。在冬季采暖季节测试了南京市9家医院针灸诊室内的相对湿度、二氧化碳、温度以及细小颗粒物的含量,并对医院病人和医护人员关于诊室内的空气质量进行问卷调查。分析结果发现,主观调查和测试结果比较吻合,细小颗粒物和室内CO2的含量对诊室内的空气质量影响很大,因此控制细小颗粒物的产生以及传播和加强通风对改善室内空气质量显得十分重要。     

针灸诊室细小颗粒物的控制策略研究

在针灸室中,用来给针灸针加热的艾条在燃烧的过程中会产生很多细小的颗粒物,而这些细小的颗粒物会严重影响病人以及医护人员健康,针对针灸室内细小颗粒物的污染现状,提出了针灸室内颗粒物污染的控制策略。     

Web编程课堂教学互动存在问题及解决策略

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