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| 1 | A general alternate loading technique and its applications in the inverse designs of centrifugal and mixed-flow pump impellers显示文摘For the inverse designs of centrifugal and mixed-flow pump impellers,clarifying the generation process of secondary flows and putting forward corresponding suppression measures is an important approach to improve the impeller performance.In this paper,to provide a better qualitative insight into the generation mechanism of secondary flows in the impeller,a simple kinematic equation is derived based on the ideal assumptions,which indicates that the potential rothalpy gradient(PRG)is the most important dynamic source that actively induces secondary vortical flows.Induced by the natural adverse PRG on the S1 and S2 stream surfaces,two typical secondary flows,H-S and P-S secondary flows,are clearly presented.To specially suppress these typical secondary flows,a general alternate loading technique(GALT)is proposed,aiming to adjust the real blade loadingδp to control the PRG features.At the blade fore part,theδp on the hub streamline should be slowly increased to avoid breakneck growth of the potential rothalpy to reduce adverse streamwise PRG on the S2 streamsurface.At the blade middle part,theδp should be moderately decreased to reduce adverse streamwise PRG on the S1 streamsurface.At the blade aft part,the difference in theδp between the shroud and hub streamlines should be decreased faster to control the exit uniformity.By applying the GALT to the impeller designs of three typical pump types in hydraulic engineering,the organizational effect of the PRG on fundamental flow structures is proven.The GALT can effectively control the PRG distributions and suppress the secondary flows,thereby widening the pump’s high-efficiency zone,improving flow uniformity and suppressing pressure fluctuations.Compared with the current Z-G method and the ALT,the GALT can meet the requirements of'de-experience'better,thereby enabling the designers to obtain good products explicitly and quickly. | WANG ChaoYue WANG FuJun AN DongSen YAO ZhiFeng XIAO RuoFu LU Li HE ChengLian ZOU ZhiChao | 2021 | Science China(Technological Sciences)2021，64，4： | 7 |
| 2 | Low-temperature NH_(3)-SCR of NO_(x) over MnCeO_(x)/TiO_(2) catalyst:Enhanced activity and SO_(2) tolerance by modifying TiO_(2) with Al_(2)O_(3)显示文摘A series of TiO_(2)-Al_(2)O_(3) composites with Al/Ti molar ratios of 0.1,0.2,and 0.4 were synthesized by a coprecipitation method and used as supports to prepare supported MnCeO_(x) catalysts by an impregnation method.The physico-chemical properties of the samples were extensively characterized by N_(2) physisorption,X-ray diffraction,Raman spectroscopy,scanning electron micro scopy and energy-dispersive Xray spectroscopy element mapping,X-ray photoelectron spectroscopy,H_(2)-temperature programmed reduction,ammonia temperature programmed desorption,and in-situ diffuse reflectance infrared Fourier transform spectroscopy.The catalytic activity and resistance to water vapor and SO_(2) of the asprepared catalysts for the SCR of NO_(x) with NH_(3) were evaluated at 50-250℃ and GHSV of 80000 mL/(gcat·h).The results reveal that MnCeO_(x)/TiO_(2)-Al_(2)O_(3) exhibits higher activity and better SO_(2) tolerance than MnCeO_(x)/TiO_(2).Combining with the characterization results,the enhanced activity and SO_(2) tolerance of MnCeO_(x)/TiO_(2)-Al_(2)O_(3) can be mainly attributed to higher relative concentrations of Mn4+and chemisorbed oxygen species,stronger reducibility,and larger adsorption capacity for NH_(3) and NO,which originate from the larger specific surface area and pore volume,higher dispersion of Mn and Ce species compared with MnCeO_(x)/TiO_(2).Moreover,in situ DRIFTS was used to investigate the reaction mechanism,and the results indicate that the NH_(3)-SCR reaction over MnCeO_(x)/TiO_(2) and MnCeO_(x)/TiO_(2)-Al_(2)O_(3) takes place by both the E-R and L-H mechanisms. | Gang Li Dongsen Mao Mengxi Chao Gehua Li Jun Yu Xiaoming Guo | 2021 | Journal of Rare Earths2021，39，7： | 6 |
| 3 | Effect of organic acid on Cd toxicityin tomato and bean growth显示文摘A Hoagland's 1 nutrient solution culture to observe the effect of 0 , 50 and 100 μmol/L oxalate acidon 0 to 10 mg/L Cd toxicity for tomato and 0 to 8 mg/L for bean and their accumulation in plants were stud-ied. There was an almost linear relationship bet | Xue Dongsen Robert B. Harrison Charles L. Henry(University of Washington , ARIO Seattle . WA 98195 , USA) | 1995 | Journal of Environmental Sciences1995，7，4： | 4 |
| 4 | Continuous and comprehensive atmospheric observations in Beijing:a station to understand the complex urban atmospheric environment显示文摘Due to profound impact on climate and human health,air quality has attracted attention from all levels of the civil society.The key step in the provision of required tools for the society to tackle the complex air quality problem is to characterize it in a comprehensive manner with a long-term perspective.Here,we describe a continuous and comprehensive observation station and its accompanying state-ofthe-art instrumentation that was established to investigate the complex urban atmospheric environment in a rapidly developing Chinese Megacity.The station,located in downtown Beijing,aims to study air quality by identifying the major atmospheric pollutants and key processes determining their formation and loss mechanisms.A few hundreds of parameters are continuously measured with the state-of-the-art instruments,including trace gas concentrations,aerosol particle size distributions,and mass concentrations,covering aerosol particle chemical composition from molecules to micrometer-sized aerosol particles.This produced long-term,comprehensive big data with around 1�10^(11)bytes per year.In this paper,we provide an overview on the facilities of the station,the instrumentation used,the workflow of continuous observations and examples of results from 2018 to 2019 and a basis for establishing a modern long-term,comprehensive atmospheric urban observation station in other megacities. | Yongchun Liu Chao Yan Zemin Feng Feixue Zheng Xiaolong Fan Yusheng Zhang Chang Li Ying Zhou Zhuohui Lin Yishou Guo Ying Zhang Li Ma Wenshuo Zhou Zhikun Liu Lubna Dada Kaspar Dallenbach Jenni Kontkanen Runlong Cai Tommy Chan Biwu Chu Wei Du Lei Yao Yonghong Wang Jing Cai Juha Kangasluoma Tom Kokkonen Joni Kujansuu Anton Rusanen Chenjuan Deng Yueyun Fu Rujing Yin Xiaoxiao Li Yiqun Lu Yiliang Liu Chaofan Lian Dongsen Yang Weigang Wang Maofa Ge Yuesi Wang Douglas R.Worsnop Heikki Junninen Hong He Veli-Matti Kerminen Jun Zheng Lin Wang Jingkun Jiang Tuukka Petaja Federico Bianchi Markku Kulmala | 2020 | Big Earth Data2020，4，3： | 3 |
| 5 | Optical and Radiative Properties of Aerosols during a Severe Haze Episode over the North China Plain in December 2016显示文摘The optical and radiative properties of aerosols during a severe haze episode from 15 to 22 December 2016 over Beijing, Shijiazhuang, and Jiaozuo in the North China Plain were analyzed based on the ground-based and satellite data, meteorological observations, and atmospheric environmental monitoring data. The aerosol optical depth at 500 nm was < 0.30 and increased to > 1.4 as the haze pollution developed. The ?ngstr?m exponent was > 0.80 for most of the study period. The daily single-scattering albedo was > 0.85 over all of the North China Plain on the most polluted days and was > 0.97 on some particular days. The volumes of fine and coarse mode particles during the haze event were approximately 0.05–0.21 and 0.01–0.43 μm3, respectively—that is, larger than those in the time without haze. The daily absorption aerosol optical depth was about 0.01–0.11 in Beijing, 0.01–0.13 in Shijiazhuang, and0.01–0.04 in Jiaozuo, and the average absorption ?ngstr?m exponent varied between 0.6 and 2.0. The aerosol radiative forcing at the bottom of the atmosphere varied from –23 to –227, –34 to –199, and –29 to –191 W m–2 for the whole haze period, while the aerosol radiative forcing at the top of the atmosphere varied from –4 to –98, –10 to –51,and –21 to –143 W m–2 in Beijing, Shijiazhuang, and Jiaozuo, respectively. Satellite observations showed that smoke,polluted dust, and polluted continental components of aerosols may aggravate air pollution during haze episodes. The analysis of the potential source contribution function and concentration-weighted trajectory showed that the contribution from local emissions and pollutants transport from upstream areas were 190–450 and 100–410 μg m^(–3), respectively. | Yu ZHENG Huizheng CHE Leiku YANG Jing CHEN Yaqiang WANG Xiangao XIA Hujia ZHAO Hong WANG Deying WANG Ke GUI Linchang AN Tianze SUN Jie YU Xiang KUANG Xin LI Enwei SUN Dapeng ZHAO Dongsen YANG Zengyuan GUO Tianliang ZHAO Xiaoye ZHANG | 2017 | Journal of Meteorological Research2017，31，6： | 2 |
| 6 | Glycine–nitrate combustion synthesis of CuO–ZnO–ZrO 2 catalysts for methanol synthesis from CO 2 hydrogenation显示文摘 | Xiaoming Guo Dongsen Mao Guanzhong Lu Song Wang Guisheng Wu | 2010 | Journal of Catalysis2010，，2： | 1 |
| 7 | Influence of calcination temperature and preparation method of TiO2-ZrO: on conversion of cyclohexanone oxime to E-eaprolaetam over B2O3/TiOr-ZrO2 catalyst显示文摘 | Mao Dongsen Lu Guanzhong Chen Qingling | 2004 | Applied Catalysis A: General2004，263，1： | 1 |
| 8 | Highly effective hybrid catalyst for the direct synthesis of dimethyl ether from syngas with magnesium oxide-modified HZSM-5 as a dehydration component显示文摘 | Dongsen Mao Weimin Yang Jianchao Xia Bin Zhang Qingying Song Qingling Chen | 2004 | Journal of Catalysis2004，，1： | 1 |
| 9 | Liming effects on availability of Cd, Cu, Ni and Zn in a soil amended with sewage sludge 16 years previously显示文摘 | Sara Brallier Robert B. Harrison Charles L. Henry Xue Dongsen | 1996 | Water Air and Soil Pollution (-)1996，，1： | 1 |
| 10 | Cole, Long-term effects of heavy applications of biosolids on organic matter and nutrient content of a coarse-textured forest soil 显示文摘 | Rob Harrison Dongsen Xue Charles Henrry and Dale W | 1994 | Forest Ecology and Management1994，66，13： | 1 |
| 11 | Highly selec- tive hydrogenation of COz to methanol over CuO-ZnO-ZrO2 catalysts prepared by a surfactant-assisted co-precipitation method 显示文摘 | LI LI DONGSEN MAO JUN YU | 2015 | Journal of Power Sources2015，279，1： | 1 |
| 12 | Enhanced C2 oxygenate synthesis by CO hydrogenation over Rh-based catalyst supported on a novel SiO2显示文摘 | YU Jun MAO Dongsen LU Guanzhong | 2012 | Catalysis Communications2012，24，： | 1 |
| 13 | Synthesis of C2-oxygenates from syngas over Rh-based catalyst supported on SiO2, TiO2 and SiO2-TiO2 mixed oxide显示文摘 | HAN Lupeng MAO Dongsen | 2012 | CatalysisCommunications2012，23，： | 1 |
| 14 | C2-oxygenates synthesis through CO hydrogenation on SiO2-ZrO2 supported Rh-based catalyst: the effect of support显示文摘 | HAN Lupeng MAO Dongsen | 2013 | AppliedCatalysisA: General2013，454，： | 1 |
| 15 | The effect of B2O3addition onthe crystallization of amorphous TiO2-ZrO2mixed oxide显示文摘 | Dongsen Mao Guanzhong Lu | 2007 | Journal of Solid State Chemistry2007，180，48： | 1 |
| 16 | CO2 Hydrogenation to Methanol over Cu/ZnO/ZrO2 Catalysts Pre- pared via a Route of Solid-State Reaction 显示文摘 | Guo Xiaoming Mao Dongsen Lu Guanzhong | 2011 | Catal Commun2011，12，12： | 1 |
| 17 | Dimethyl ether synthesis via CO 2 hydrogenation over CuO–TiO 2 –ZrO 2 /HZSM-5 bifunctional catalysts显示文摘 | Song Wang Dongsen Mao Xiaoming Guo Guisheng Wu Guanzhong Lu | 2009 | Catalysis Communications2009，，10： | 1 |
| 18 | Synthesis and luminescence properties of YVO 4 :Eu 3+ cobblestone - like microcrystalline phosphors obtained from the mixed solvent - thermal method显示文摘 | Xiuzhen Xiao Guanzhong Lu Shaodian Shen Dongsen Mao Yun Guo Yanqin Wang | 2010 | Materials Science & Engineering B2010，，1： | 1 |
| 19 | Gly- cine-Nitrate Combustion Synthesis of CuO-ZnO-ZrO2 Cata- lysts for Methanol Synthesis from CO2 Hydrogenation 显示文摘 | Guo Xiaoming Mao Dongsen Lu Guanzhong | 2010 | J Catal2010，271，2： | 1 |
| 20 | Dimethyl ether synthesis via CO2 hydrogenation over CuO-TiO2- ZrO~4ZSM-5 bifunctional catalysts 显示文摘 | Song Wang Dongsen Mao Xiaoming Guo Guisheng Wu Guanzhong Lu | 2009 | Catalysis Communica- tions2009，，10： | 1 |
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