The problem of guided wave propagation in a wave guide with imperfectly reflecting boundaries arises in several applications, such as propagation in mine tunnels and in screened surface wave guides. In recent years, many studies have been carried out on the propagation characteristic of radio waves in tunnels in UHF band [1-2]. From the theoretical point of view, tunnels can be regarded as holl...

An analytical investigation and conceptual design of a disk-shaped asymmetric heat pipe is presented in this work. Using the conservative formulations for the steady incompressible vapor and liquid flow for a disk-shaped heat pipe, an in-depth integral analysis is applied. Analytical results for the asymmetric vapor velocity profile, the vapor and liquid pressure distributions, and the vapor te...

Rectangular reinforced concrete pipes are widely used in various municipal projects. Because they often located weak strata urban areas, prone to structural defects such as corrosion, which turn leads a decline the bearing capacity of and, severe cases, causes disasters pipe collapse. In this paper, mechanical properties rectangular with corrosion studied through laboratory tests, and influence...

For the problem of gas accumulation in product bunker a company’s coal processing plant, three different ventilation schemes are proposed. The first one opens rectangular air inlet louvers on wall and adds fans top for exhaust; second sets six windows evenly natural ventilation; third sends to interior through small holes distributed pipes exhaust ports wall. Finally, effect management scheme i...

The electronic industries have been tried to develop the electronic packaging technology for high-density, light weight, and miniaturization of mobile personal information terminals such as notebook PC, personal digital assistant (PDA), or handheld PC as the performance and the portability of the system have been become important more and more. The generated heat from the CPU of the electronic ...

We study the role geometry plays in the emergence of asymmetries in diffusing passive scalars advected by pressure-driven flows in ducts and pipes of different aspect ratios. We uncover nonintuitive, multi-time-scale behavior gauged by a new statistic, which we term "geometric skewness" S^{G}, which measures instantaneously forming asymmetries at short times due to flow geometry. This signature...