Advanced Materials Research Vol. 981

Abstract: Giving the concept of the aero ballistics, the equations of mass trajectory of pill in the rectangular coordinate system under standard conditions and the equations of mass trajectory of pill considering the influence of wind are introduced in this paper. Forth-order Runge-Kutta algorithm is used for the equations to simulate, the experiment analysis has been discussed in the last. The result shows that such method of simulation has more accuracy in direction and distance.

Abstract: The rational design of coal mining machinery improves the efficiency of coal production and reduces the production cost. Basing on specific mining examples, a set of mining machinery system was obtained by technologically analyzing the calculation of production efficiency, as well as the selection of mining machinery, supporting device, and conveyor etc.

Abstract: In the paper,the relationship of the energy efficiency and its impact factor such as intake valve lift ,exhaust valve lift, clearance volume and rotational speed has been researched and the optimal conditions of the air compressor running was found . By adjusting the parameters of intake valve lift, exhaust valve lift, clearance volume and rotational speed, the total energy of a W-1.6/5 compressor could be reduced by 10.9%.

Abstract: The system of achromatic phase matching (APM) based on grating pairs is designed by the commercial optical design software ZEMAX. Firstly, we theoretically calculate the theoretical incident angular where each frequency components exactly reaches the phase-matching in nonlinear crystals. Subsequently, the model of APM system is built and optimized in ZEMAX. The results are well in accordance with the theoretical ones. In addition, the effects of grating frequency and aberration produced by the focus lens on APM scheme are analyzed.

Abstract: End support on coal face is an important equipment of improving the work efficiency and the safety of coal mine production. Based on the work environment and the requirements for end support, the research analyzed the mechanical design of end support, such as its structure and composition. Moreover, several features which need to be paid attention to in the design of end support were proposed as well.

Abstract: Thermal insulating door is a critical component of environmental laboratory. By analyzing the structure, manufacturing and installing precision of thermal insulating door, the installation error of guide, and the selection of elements applied in electric control system of thermal insulating door etc, the research proposed the method of ensuring the system precision of thermal insulating door.

Abstract: Line spectrum is one kind of important feature information of the ship radiated noise, which provides a strong basis for the ship detection and identification. Due to the complexity of marine environment and the special nature of underwater acoustic channel,it is difficult to obtain ship radiated noise’ signals from the complex background noise. Under this situation, this paper proposed the cepstrum as the extraction method of obtaining feature information of the ship radiated noise, and the robust to noise performance was analyzed and compared. The analysis’ result shows that the method is simple, which is able to accurately extract feature line spectrum and shows good robust to noise.

Abstract: In this paper, the typical two-dimensional Henon map is studied. Firstly, the model of Henon map is proposed based on DSP Builder platform in Simulink library, so it can generate digital output sequence of Henon map. Then, its statistical properties are analyzed for such output sequences, including balance test, run test and autocorrelation test. Finally, the numerical results show that such digital Henon sequences have good pseudo-randomness.

Abstract: SiO₂ nanoparticles (NPs) are synthesized in ethanol solution and mixed with polyvinyl carbazole (PVK). The sizes of SiO₂ NPs are 40nm and 60nm. PVK/SiO₂ NPs compound systems with different sizes and with different ratios of mass fraction are obtained. Photoluminescence spectra are employed to research the optical properties of PVK molecules and PVK/SiO₂ NPs compound system. In compound system, the process of interface energy transfer between PVK and SiO₂ NPs are observed. The mainly energy transfer form is nonradiative resonance transfer.

Abstract: CdSe semiconductor nano crystals (NCs) and Polyaniline (PAni) are mixed uniformly to prepare CdSe NCs/PAni complex. PAni can quench the fluorescent signal of CdSe NCs. The fluorescent intensity of CdSe NCs/PAni complex is related to the size of CdSe NCs and concentration of PAni. Ultraviolet visual (UV-Vis) absorption spectra and fluorescence spectra are employed to analysis the quenching phenomenon. The mechanism of fluorescence quench is dependent on two factors: on one hand, the FÖrster resonance energy transfer conducts from CdSe to PAni; on the other hand, PAni can intercept the electron charge of CdSe and lead to the interruption of radiative recombination.