Application of wavelet transform de-noising in pole identification of a system

Due to the multiscale character of wavelet transform, the method of wavelet transform de-noising (WTDN) is introduced. The WTDN method neither requires extra limit of frequency range for the processed signal,nor needs a prior estimate of impulse response for an identified system, so it is especially suitable to de-noise the wide-band signal and the impulse response of a blind system. The numerical simulation results indicate that the WTDN method is reliable, The WTDN method was used to process the sampled data from a preamplifier coupled to a gas detector. The experimental results also show that the WTDN method can effectively improve the SNR of sampled data and enhance the accuracy in pole identification of the system,     

论玻尔理论和对应原理

玻尔理论完满的解释了氢原子光谱的规律,推动了量子力学的形成.时应原理则说明在极限的情况下,量子力学可以过渡到经典物理,本文详细分析了玻尔理论的建立过程以及量子力学与经典物理相对应的普遍原理一对应原理.     

Electron Transport Coefficients and Effective Ionization Coefficients in SF6-O2 and SF6-Air Mixtures Using Boltzmann Analysis

The electron drift velocity, electron energy distribution function （EEDF）, densitynormalized effective ionization coefficient and density-normalized longitudinal diffusion velocity are calculated in SF6-O2 and SFs-Air mixtures. The experimental results from a pulsed Townsend discharge are plotted for comparison with the numerical results. The reduced field strength varies from 40 Td to 500 Td （1 Townsend=10-17 V.cm2） and the SF6 concentration ranges from 10% to 100%. A Boltzmann equation associated with the two-term spherical harmonic expansion approximation is utilized to gain the swarm parameters in steady-state Townsend. Results show that the accuracy of the Boltzlnann solution with a two-term expansion in calculating the electron drift velocity, electron energy distribution function, and density-normalized effective ionization coefficient is acceptable. The effective ionization coefficient presents a distinct relationship with the SF6 content in the mixtures. Moreover, the E/Ncr values in SF6-Air mixtures are higher than those in SF6-O2 mixtures and the calculated value E/Ncr in SF6-O2 and SF6-Air mixtures is lower than the measured value in SFB-N2. Parametric studies conducted on these parameters using the Boltzmann analysis offer substantial insight into the plasma physics, as well as a basis to explore the ozone generation process.     

跨玻尔速度能区Xe~(23+)离子与Ne原子碰撞中的电子过程

本文用飞行时间符合技术实验研究了跨玻尔速度能区(入射离子速度为0.65~1.32a.u.,a.u.为玻尔速度)高电荷态离子Xe23+与Ne原子碰撞中的多电子过程,通过分析符合二维谱获得各反应道(靶原子的电子丢失、电子转移以及伴随电离的电子丢失)的相对截面,并与拓展的过垒模型及相关的经验公式进行了对比,结果与过垒模型符合相对较好。     

陶瓷人旁听两会 广提意见促佛山陶瓷发展

<正>本刊讯2月3~6日,佛山两会举行,一场关乎市计民生的盛会拉开了帷幕。记者了解到,一些陶瓷人也以旁听者的身份参加了两会,并提交了相关行业发展的意见。佛山市陶瓷学会副秘书长、佛山市玻尔陶瓷科技有限公司总经理、武汉理工大学兼职教授蔡飞虎针对佛山市陶瓷色釉料和辅料、陶瓷行业的人才培养和特种陶瓷的发展提了意见。