http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
The Selection of Machining Parameters to Minimize Deformation caused by Heat
Hengbo Cui,Jong-Yun Jung,Dug-Hee Moon 한국산업경영시스템학회 2005 한국산업경영시스템학회 학술대회 Vol.2005 No.추계
Machining processes generate severe heat, which deforms thin metallic parts while they are being processed. The amount of deformation of a thin part is mainly dependent on heat and the shape of a component. The selection of machining parameters can decrease the temperature arisen during a machining process. This paper investigates selecting machining parameters to minimize the heat-deformation that is produced during machining. Taguchi method is applied to setup experiments. Three factors and three levels for each factor in the experimental design are selected. This research analyzes the effects of machining parameters to minimize the heat-deformation through examining the analysis of variance (ANOVA) and the signal to noise ratio (S/N).
Wang Hengbo,Feng Meichang,Zhong Xiaoqiang,Yu Qing,Que Youxiong,Xu Liping,Guo Jinlong 한국유전학회 2023 Genes & Genomics Vol.45 No.1
Background Calmodulin (CaM) plays an essential role in binding calcium ions and mediating the interpretation of Ca2+ signals in plants under various stresses. However, the evolutionary relationship of CaM family proteins in Saccharum has not been elucidated. Objective To deduce and explore the evolution and function of Saccharum CaM family. Methods A total of 104 typical CaMs were obtained from Saccharum spontaneum and other 18 plant species. The molecular characteristics and evolution of those CaM proteins were analyzed. A typical CaM gene, ScCaM1, was subsequently cloned from sugarcane (Saccharum spp. hybrid). Its expression patterns in different tissues and under various abiotic stresses were assessed by quantitative real-time PCR. Then the green fluorescent protein was used to determine the subcellular localization of ScCaM1. Finally, the function of ScCaM1 was evaluated via heterologous yeast expression systems. Results Three typical CaM members (SsCaM1, SsCaM2, and SsCaM3) were identified from the S. spontaneum genome database. CaMs were originated from the two last common ancestors before the origin of angiosperms. The number of CaM family members did not correlate to the genome size but correlated with allopolyploidization events. The ScCaM1 was more highly expressed in buds and roots than in other tissues. The expression patterns of ScCaM1 suggested that it was involved in responses to various abiotic stresses in sugarcane via different hormonal signaling pathways. Noteworthily, its expression levels appeared relatively stable during the cold exposure in the cold-tolerant variety but significantly suppressed in the cold-susceptible variety. Moreover, the recombinant yeast (Pichia pastoris) overexpressing ScCaM1 grew better than the wild-type yeast strain under cold and oxidative stresses. It was revealed that the ScCaM1 played a positive role in reactive oxygen species scavenging and conferred enhanced cold and oxidative stress tolerance to cells. Conclusion This study provided comprehensive information on the CaM gene family in Saccharum and would facilitate further investigation of their functional characterization.
Huasheng Lu,Hengbo Yin,Aili Wang,Jun Shen,Xiaobo Yan,Yumin Liu,Changhua Zhang 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.1
Diethyl 3,4-ethylenedioxythiophene-2,5-dicarboxylate was efficiently synthesized via the O-alkylation of disodium salt of diethyl 3,4-dihydroxythiophene-2,5-dicarboxylate with 1,2-dichloroethane over ionic type phase transfer catalysts, such as tetrabutyl ammonium bromide and benzyltriethyl ammonium chloride. The ionic type phase transfer catalysts showed higher catalytic activities than the nonionic type phase transfer catalysts, such as triethylamine,pyridine, 18-crown-6, and polyethylene glycol 400/600, in the O-alkylation reaction. The conversion of the disodium salt of more than 97% and the selectivity of diethyl 3,4-ethylenedioxythiophene-2,5-dicarboxylate of more than 98%were achieved when the O-alkylation reaction was synergistically catalyzed by tetrabutyl ammonium bromide and potassium iodide.
Haixu Yin,Hengbo Yin,Aili Wang,Lingqin Shen 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Catalytic conversion of biomass glycerol to lactic acid is an alternative to the conventional fermentation process starting from carbohydrate. Graphite-supported metallic Ni0 nanoparticles effectively catalyzed the hydrothermal conversion of glycerol to lactic acid in NaOH aqueous solution. Ni0 nanoparticle and NaOH synergistically catalyzed the glycerol conversion to lactic acid. When the reaction was carried out with the initial glycerol and NaOH concentrations of 1.0 and 1.1 mol L−1 at 230 °C for 3 h over Ni0.3/graphite catalyst, the selectivity of lactic acid was 92.2% at the glycerol conversion of 97.6%. The reaction activation energy, Ea, was 69.2 kJ mol L−1.
Dezhi Gao,Hengbo Yin,Aili Wang,Lingqin Shen,Shuxin Liu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
Hydroxylapatite (HAP), SBA-15, and MCM-41 supported copper catalysts were used for the coupling reaction between ethanol dehydrogenation and maleic anhydride hydrogenation. CuO species were completely reduced to metallic copper (Cu0), which was the active site for the coupling reaction. Cu/SBA- 15 and Cu/MCM-41 catalysts favored the formation of acetaldehyde and diethyl succinate. Cu/HAP catalysts with high basicity and small crystallite-sized Cu0 nanoparticles favored the dehydrogenation of ethanol to ethyl acetate with the maximum selectivity of 69.5% and the hydrogenation of maleic anhydride to g-butyrolactone with the maximum selectivity of 89.6%. The coupling reaction had good compensation for reaction heat and hydrogen.
Yujun Fu,Hengbo Yin,Yiqian Jiang,Lingqin Shen,Yonghai Feng,Aili Wang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Methylchlorophenyldichlorosilane (MeClPhSiCl2) and methyldichlorophenyldichlorosilane (MeCl2Ph-SiCl2) were synthesized by the catalytic chlorination of methylphenyldichlorosilane (MePhSiCl2) withCl2 over Lewis acid catalysts. The catalytic activities of Lewis acid catalysts were in an order ofFeCl3 > SbCl5 > AlCl3 > SnCl4. However, FeCl3 also highly catalyzed the cleavage of chlorophenyl–siliconbond to form chlorobenzene. At a low mole ratio of SbCl5 to MePhSiCl2 of 1.4 × 10-5:0.45, the yield ofMeClPhSiCl2 was around 60% after reacting at 25–100 8C for 15–20 h. At a high mole ratio of1.4 × 10-4:0.45, the yield of MeCl2PhSiCl2 reached 44% after reacting at 80–100℃ for 20 h.
Lingqin Shen,Hengbo Yin,Aili Wang,Xiufeng Lu,Changhua Zhang,Fen Chen,Yuting Wang,Huijuan Chen 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Liquid phase dehydration of glycerol to acrolein catalyzed by Brønsted acidic ionic liquids (BAILs) usingsemi-batch reaction technique was investigated. For the BAILs catalysts, the acrolein yields were inan order of [Bmim]H2PO4 > [Bmim]HSO4 > [BPy]HSO4 > [PSPy]HSO4 > [N2224]HSO4 > [PSPy]H2PO4> [BPy]H2PO4 > [N2224]H2PO4. When [Bmim]H2PO4 and [Bmim]HSO4 were used as the catalysts at 270℃ with the molar ratio of catalyst to glycerol of 1:100, the acrolein yields were 57.4% and 50.8%,respectively, at complete conversion of glycerol. The BAILs with [Bmim] cation and moderate acidityfavored the formation of acrolein in liquid phase glycerol dehydration.
Zhipeng Lu,Hengbo Yin,Dezhi Gao,Aili Wang,Shuxin Liu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
Catalytic dehydrogenation of methanol to methyl formate over SiO2-, hydroxyapatite (HAP)-, and MgOsupportedcopper catalysts was investigated. Metallic copper (Cu0) was the active site for the methanoldehydrogenation to methyl formate. Cu/SiO2 catalyst with low basicity and weak-strength basic siteeffectively catalyzed the methanol dehydrogenation to methyl formate. Cu/HAP and Cu/MgO catalystswith high basicities and strong-strength basic sites caused the degradation of the resultant methylformate to CO and H2. Over Cu(5)/SiO2 catalyst, the reaction activation energies for methanoldehydrogenation to methyl formate and methyl formate degradation to CO and H2 were 58.3 and91.1 kJ mol 1, respectively.
Hydrogenation of ethyl acetate to ethanol over Cu/ZnO/MOx (MOx = SiO2, Al2O3, and ZrO2) catalysts
Zhipeng Lu,Hengbo Yin,Aili Wang,Jing Hu,Wuping Xue,Haixu Yin,Shuxin Liu 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
The Cu/ZnO/SiO2, Cu/ZnO/Al2O3, and Cu/ZnO/ZrO2 catalysts prepared by the co-precipitation methodwere used for the catalytic hydrogenation of ethyl acetate to ethanol. The addition of ZnO in the Cu/ZnO/MOx catalysts improved their catalytic activities for the hydrogenation reaction. Small-sized coppercrystallite and high surface acidity favored the catalytic hydrogenation of ethyl acetate to ethanol. TheCu/ZnO/Al2O3 catalyst gave the ethanol selectivity of ca. 95% at the ethyl acetate conversion of ca. 80%when the reaction temperature was 280 8C. The reaction activation energy over Cu/ZnO/Al2O3 catalystwas 115 kJ mol 1, lower than those over the Cu/ZnO/SiO2 and Cu/ZnO/ZrO2 catalysts.
Chun Liu,Hengbo Yin,Chen Ge,Aili Wang,Min Ren,Yunsheng Zhang,Longbao Yu,Tingshun Jiang 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.6
Uniform sized and integrated hollow silica spheres with porous shells were prepared by using sulfuric and carboxylic acid-functionalized polystyrene latex spheres as templates, sodium silicate as a precursor, and cetyltrimethylammonium bromide as a shell structure-directing agent. When polystyrene-methyl acrylic acid latex spheres were used as the templates, the pores in the shells of the resultant hollow silica spheres were composed of both micropores and mesopores. The pores in the shells of the hollow silica spheres were mainly composed of mesopores when sulfonated polystyrene-methyl acrylic acid latex spheres were used as the templates. The shell thickness and the specific surface area of the hollow silica spheres increased with the increase in the surface acidity of the latex spheres.