Recently, Changchun Optical Machine Co., Ltd. has produced an organic film of high-order micron single-crystal fiber with the lowest amplification spontaneous emission threshold in the world. This film plays an important role in the development and application of electro-pumped organic lasers.
Today, lasers are widely used in communications, industrial equipment testing, etc. For this reason, pumping organic lasers has important scientific significance and application value, but its devices require that organic materials have low amplification spontaneous emission thresholds and high carriers at the same time. Features such as mobility. However, in practical research, the high carrier mobility requires organic materials to have a highly ordered structure, and it is difficult for this organic material to obtain low-threshold amplified spontaneous emission.
Recently, Liu Xingyuan and associate researcher Qu Songnan, researcher of the State Key Laboratory of Phosphorescence and Application of the Changchun Institute of Optoelectronics, developed a high-order, high-efficiency organic laser material and a low-amplification spontaneous emission threshold. The structured organic thin film method provides an important material research foundation for obtaining low-threshold, electrically pumped organic lasers in the future.
A shell and tube heat exchanger consists of components such as a shell, heat transfer tube bundle, tube plate, baffle plate (baffle), and tube box. The shell is mostly cylindrical, with a tube bundle installed inside, and both ends of the tube bundle are fixed on the tube plate. There are two types of fluids for heat exchange: cold and hot. One flows inside the tube and is called the tube side fluid; Another type of fluid that flows outside the tube is called shell side fluid. To improve the heat transfer coefficient of the fluid outside the tube, several baffles are usually installed inside the shell. The baffle can increase the velocity of the shell side fluid, forcing the fluid to pass through the tube bundle multiple times according to the specified path, and enhancing the degree of fluid turbulence. The heat exchange tubes can be arranged in equilateral triangles or squares on the tube plate. The equilateral triangle arrangement is relatively compact, with a high degree of turbulence in the fluid outside the pipe and a large heat transfer coefficient; A square arrangement facilitates cleaning outside the pipe and is suitable for fluids that are prone to scaling.
Cooling Shell And Tube Heat Exchanger, Evaporative Shell And Tube Heat Exchanger, Condensing Shell And Tube Heat Exchanger, Heating Shell And Tube Heat Exchanger
Yangzhou Tongyang Chemical Equipment Co., Ltd. , https://www.tongyangchemic.com