http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hui Zhuang,Jianguo Ding,Peng Chen,Yu Chang,Xiaoyun Zeng,Hong Yang,Xingbao Liu,Wei Wei 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.10
In this paper, four waviness types are presented to investigate the effect of surface waviness on the static performance, dynamic performance and stability of an aerostatic thrust bearing with orifice-type restrictor. The influences of wave amplitude and rotational speed on the bearing performances are studied. The Reynolds equation is first solved through small perturbation method to obtain the static and dynamic characteristics. Subsequently, by adopting an iterative method based on the acquired dynamic coefficients, a numerical method is proposed to analyze the bearing stability. The calculated critical supply pressure is compared with that obtained by the traditional orbit method and it indicates that the proposed method has higher computational efficiency. The results show that the surface waviness has great influence on the bearing performances and the effect becomes increasingly pronounced with the growth of wave amplitude. The performances are more sensitive to the waviness arranged in bearing radial direction than circumferential direction. The enhancement of certain performance is always accompanied by the decline of another performance for the bearing with wave pattern on the surface, which leads to the fact that the bearing performances cannot be comprehensively improved in static characteristic, dynamic characteristic and stability. Besides, high rotational speed will cause pneumatic instability more readily. Finally, a stiff ness measuring experiment and a modal test are performed to verify the accuracy of computational analysis and results.
Mixue Zhuang,Aixiang Wei,Jun Liu,Yu Zhao,Zhiqiang Yan 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.6
CuInS2 (CIS) thin films with controllable nanostructures were directly synthesized on transparent conductive fluorine- doped tin oxide (FTO) glass substrates through a solvothermal process, using the precursors of copper (II) chloride dihydrate, indium (III) nitrate, thiourea, hexadecyl trimethyl ammonium bromide (CTAB), oxalic acid, and ethanol. The morphology, crystallographic structure, chemical composition, and optical properties of the CIS thin films were then investigated. The results indicate that CIS thin films with two types of “nanosheet arrays and nanosheet microspheres” can be synthesized by controlling the deposition process parameters. The nanosheets are well-crystallized single crystals with chalcopyrite structures. They exhibit strong absorption in the UV-visible light region and a band gap of 1.51 eV, rendering them suitable for application as the absorber layer of a thin film solar cell. Based on our experimental observations and analysis, we conclude that differences in nucleation and growth mechanism lead to CIS films with various nanostructures.
Highly Chemo- and Regioselective Reaction of Hydroxybenzenes in Acidic Ionic Liquid
Hui Guo,Yu Wei Zhuang,Jian Cao,Guo Bao Zhang 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
Highly chemo- and regioselective reaction of hydroxybenzenes with α,β-unsaturated compounds in acidic ionic liquid l-butyl-3-methylimidazolium hydrogen sulphate ([BMIM]HSO4) was reported for the first time. A series of oxa-Michael adducts and Friedel-Crafts alkylated products were synthesized with good yields. The acidic ionic liquid could be easily recycled for at least 5 times with only minor loss in activity.
Highly Chemo- and Regioselective Reaction of Hydroxybenzenes in Acidic Ionic Liquid
Guo, Hui,Zhuang, Yu Wei,Cao, Jian,Zhang, Guo Bao Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
Highly chemo- and regioselective reaction of hydroxybenzenes with ${\alpha},{\beta}$-unsaturated compounds in acidic ionic liquid l-butyl-3-methylimidazolium hydrogen sulphate ([BMIM]HSO4) was reported for the first time. A series of oxa-Michael adducts and Friedel-Crafts alkylated products were synthesized with good yields. The acidic ionic liquid could be easily recycled for at least 5 times with only minor loss in activity.
Ma Wen-Zhuang,Liu Jing,Yu Gao-Xiang,Chen Wei,Chen Yu-Shan,Deng Xu-Chu 한국물리학회 2021 Current Applied Physics Vol.27 No.-
In this paper, a novel guided-mode resonances (GMRs) based embedded dual-wavelength filter, which had the bilayer gratings located at the two sides of dielectric substrate and arranged at asymmetric position, was investigated and studied theoretically. As compared to symmetric structures that usually provided single wavelength of transmission resonance, as one normal incidence was used for transverse magnetic polarized light, the designed asymmetric structure could generate two remarkable narrow band wavelengths of transmission resonance. The parameters to affect the resonance wavelengths and the transmission resonance Q value (Q = λ/Δλ) of two bands were the distance between the two metallic gratings, the relatively lateral positions of the upper and lower gratings, the number of structure period, the thicknesses of metallic gratings, and the thickness of dielectric film. By optimizing the designed parameters, a GMR device with two resonance wavelengths located at 1239 and 1302 nm showed relative optimal performance because they had high transmission depth (99.9% and 90%) and ultra-narrow transmission bandwidth (2.8 and 1.8 nm) at the two resonance wavelengths. The presented structure can offer a potential route towards dual-band narrow-band filters and refractive index sensors in the near infrared.