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RISS 인기검색어
- 검색키워드
- 저자 : Guiping Huang (검색결과 5 건)
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Guiping Cao,Hui Huang,Shaohong Wang 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9
The effect of trimethyl phosphate on Cu/Zn catalyst prepared by co-precipitation method for hydrogenation of methyl laurate to dodecanol in a slurry phase was studied using a stirred autoclave reactor system. The catalysts were characterized by means of XRD, EDS, XPS, SEM and BET. The results indicated that catalytic activity decreased with the increased amount of trimethyl phosphate. Correlating with the results from the above characterization, it was found that the main cause for the catalyst deactivation was the trimethyl phosphate occlusion of active sites by the physical adsorption and BET surface area decrement.
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Hui Huang,Guiping Cao,Shaohong Wang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Deactivation of co-precipitated Cu/Zn catalyst caused by exposure to either alkylthiols or dialkyldisulfides in catalytic hydrogenation of dodecyl methyl ester to dodecanol is explored in a stirred batchreactor. Catalytic activity decrement is highly dependent on levels of poisons, types of thiols/disulfides,chain length of alkanes. XRD, EDS and XPS are employed to characterize the fresh and spent Cu/Zncatalysts. It is evident that sulfuric species prefer to attack zinc oxide, forming chemically adsorbed Zn-SR at low sulfur levels, and ZnS is formed in the highly reductive atmosphere before sulfuric speciesattacking copper (forming Cu7S4 or Cu31S16).
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Effect of water on Cu/Zn catalyst for hydrogenation of fatty methyl ester to fatty alcohol
Hui Huang,Chunling Fan,Shaohong Wang,Shujia Wang,Guiping Cao 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.6
The effect of water on Cu/Zn catalyst prepared by co-precipitation for hydrogenation of methyl laurate in a slurry phase was studied using a stirred autoclave reactor system. The catalysts were characterized by means of XRD, BET, H2-TPR, SEM and TEM. The results indicate that catalytic activity decreases with increased amount of water in methyl laurate. Correlating with the results from the above characterization, it is found that the main causes for the water deactivation of the Cu/Zn catalyst were the water occlusion of active catalyst sites by the low solubility of water in the substrate and the promotion of crystal growth, as well as the Cu/Zn catalyst agglomeration in the presence of water.
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Effect of Light Intensity on Close-Range Photographic Imaging Quality and Measurement Precision
Kaifeng Ma,Ximin Cui,Guiping Huang,Debao Yuan 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.2
To test the effectiveness of flash intensity in digital close-range photogrammetry, test methods for the light intensity adjustment of a ring-flash on close-range photographic imaging quality and measuring precision were researched respectively. First, according to the efficiency of the flash, the imaging characteristics, and the gray distribution of the mark points of the image, the identified method of the image gray value for subjective visual analysis was presented, and a quality standard for the close-range photographic image was provided. Then, as a precondition to obtaining the best image quality, based on the estimation theory governing measurement adjustment precision, the changes in measuring precision under conditions of different light intensity and different photographic distances were analysed, and the relationships between measurement precision and light intensity, or photographic distance, were obtained. Finally, the globally optimal imaging quality and measurement precision for any given light intensity were quantified. Experimental results indicated that the root mean square (RMS) errors of the measurement adjustment precision were 0.028 mm, 0.039 mm, and 0.085 mm: the RMS errors in the measuring precision and the corresponding coordinate repeatability were 0.038 mm, 0.053 mm, and 0.118 mm. The best imaging quality was achieved at photographic distances of 3 m, 5 m, and 7 m, with corresponding output light intensities of 1/64, 1/32, and 1/16 under certain conditions, respectively. This can satisfy the precision requirements for large-scale coordinate measurement, and provides a basis for formulating a reasonable light intensity output from a ring-flash in the digital close-range photogrammetry.
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Substrate effect on phonon in graphene layers
Xiao Guo,Yongsong Wang,Siwen You,Dingbang Yang,Guiping Jia,Fei Song,Weidong Dou,Han Huang 한국탄소학회 2023 Carbon Letters Vol.33 No.5
Graphene exhibits high carrier mobility and concentration as well as other remarkable properties. Among them, the thermal behaviors of phonon modes play important roles in the application of optical and electronic devices. Here, A–A stacked graphene were proved well by Raman investigation on G and 2D modes. Temperature-dependent Raman scattering measurements on graphene with various number of layers on different substrates were conducted in the temperature range of 80–460 K. The first-order temperature coefficient of single layer graphene (SLG) on SiO2/ Si substrate is obviously smaller than that on Cu foil, indicating that the substrate effect attributes a great impact on graphene phonon temperature dependence. The first-order temperature coefficients of multilayer graphene linearly decrease as the number of layers increases, attributed to the reduction of substrate effect in phonon behaviors, rather than to the anharmonic phonon–phonon (ph–ph) coupling or thermal expansion.
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