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| 1 | Reconstruction of temperature series in China for the last 5000 years显示文摘有为在中国的最后 5000 年的 100 年决定的一个温度系列被 using31 重建了从最后 20 年里的最近的出版物的长期的温度代理系列。代理记录包括花粉,石笋,湖沉积,泥炭,冰核心和历史的文件。结果表明在千年的规模温度变化,它在 3050-250 BC,它在 250 BC 是冷的 - 1950 广告。在上述二个时期,有亚规模温度变化的许多阶段。结果也在 2850 BC, 2350 BC, 1350 BC, 950-350 BC, 50-250 广告,和 550 广告在这个世纪显示出明显的温度差异到在东方季风区域, Qinghai- 西藏区域和西北的区域之间的多世纪规模。在这篇论文的重建的系列和某诺思半球温度系列之间的比较显示在长期的规模变化,在中国的温度变化在最后 5000 年期间在有北半球的短语,当在到多世纪的世纪在那里的规模是时,在开始和结束的差别预定,它可以暗示温度变化不在不同区域同时发生。 | GE Quansheng WANG Shunbing ZHENG Jingyun | 2006 | Progress in Natural Science:Materials International2006，16，8： | 8 |
| 2 | Numerical simulation of cavitation turbulence in Francis turbine runner with splitter blades显示文摘Cavitation will reduce the turbine performance and even damage the turbine components.To verify the effects of splitter blades on improving the cavitation performance,the cavitation flow inside a Francis turbine runner with splitter blades was numerically simulated by using the Singhal cavitation model and the standard k-ε turbulence model.The distributions of static pressure and gas volume fractions on the surface of the runner blades were predicated under different conditions,and the cavitation in the flow field of the runner was analyzed.The results show that the static pressure and gas volume fractions are more uniformly distributed on the short blades than those on the long blades in Francis turbines with splitter blades,and there is almost no cavitation on the short blades;their distributions are more uniform under small flow conditions than those under large flow conditions;and large gas volume fractions are concentrated at the outlet tip near the band on the suction side of the long blade.The installation of splitter blades can improve the cavitation performance of conventional Francis turbines. | WANG Huiyan LIU Xiaobing JIANG Qifeng HUA Hong OU Shunbing | 2020 | 排灌机械工程学报2020，38，1： | 2 |
| 3 | Effects of metal and acidic sites on the reaction by-products of butyl acetate oxidation over palladium-based catalysts显示文摘Catalytic oxidation is widely used in pollution control technology to remove volatile organic compounds. In this study, Pd/ZSM-5 catalysts with different Pd contents and acidic sites were prepared via the impregnation method. All the catalysts were characterized by means of N2 adsorptiondesorption, X-ray fluorescence(XRF), H2 temperature programmed reduction(H2-TPR), and NH3 temperature programmed desorption(NH3-TPD). Their catalytic performance was investigated in the oxidation of butyl acetate experiments. The by-products of the reaction were collected in thermal desorption tubes and identified by gas chromatography/mass spectrometry. It was found that the increase of Pd content slightly changed the catalytic activity of butyl acetate oxidation according to the yield of CO2 achieved at 90%, but decreased the cracking by-products, whereas the enhancement of strong acidity over Pd-based catalysts enriched the by-product species. The butyl acetate oxidation process involves a series of reaction steps including protolysis, dehydrogenation, dehydration, cracking, and isomerization. Generally, butyl acetate was cracked to acetic acid and 2-methylpropene and the latter was an intermediate of the other by-products, and the oxidation routes of typical by-products were proposed. Trace amounts of 3-methylpentane, hexane, 2-methylpentane, pentane, and 2-methylbutane originated from isomerization and protolysis reactions. | Lin Yue Chi He Zhengping Hao Shunbing Wang Hailin Wang | 2014 | Journal of Environmental Sciences2014，26，3： | 1 |
| 4 | Primary energy-related carbon dioxide emissions in China显示文摘Climate change is one of the focuses to mitigate greenhouse effect and reduce carbon dioxide emissions.First,the paper summarizes on the carbon dioxide emission factors and methods suitable to the situation in China.Second,it analyzes the primary energy-related carbon dioxide emissions during the period between 1995 and 2005 from different fossil fuels and different zones.The trend of primary energy-related carbon dioxide emissions from 1995 to 2005 is'first decreasing and later increasing.'Seven regions-Liaoning,Shanxi,Hebei,Shandong,Henan,and Jiangsu-and most of the provinces(cities or regions)were found to have similar trends regarding total carbon dioxide emissions in China.The annual carbon dioxide emissions and the growth ratio of these seven regions are much higher compared to those of the other 24 provinces(cities or regions).Finally,this paper puts forward some suggestions to reduce carbon dioxide. | Yiqiang Guo Jingyun Zheng Quansheng Ge Shunbing Wang | 2013 | Chinese Journal of Population,Resources and Environment2013，11，4： | 1 |
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