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| 1 | Theoretical study of flow ripple for an aviation axial-piston pump with damping holes in the valve plate显示文摘Based on the structure of a certain type of aviation axial-piston pump's valve plate which adopts a pre-pressurization fluid path(consisting a damping hole,a buffer chamber,and an orifice)to reduce flow ripple,a single-piston model of the aviation axial-piston pump is presented. This single-piston model comprehensively considers fluid compressibility,orifice restriction effect,fluid resistance in the capillary tube,and the leakage flow. Besides,the instantaneous discharge areas used in the single-piston model have been calculated in detail. Based on the single-piston model,a multi-piston pump model has been established according to the simple hydraulic circuit. The single- and multi-piston pump models have been realized by the S-function in Matlab/Simulink. The developed multi-piston pump model has been validated by being compared with the numerical result by computational fluid dynamic(CFD). The effects of the pre-pressurization fluid path on the flow ripple and the instantaneous pressure in the piston chamber have been studied and optimized design recommendations for the aviation axial-piston pump have been given out. | Guan Changbin Jiao Zongxia He Shouzhan | 2014 | Chinese Journal of Aeronautics2014，27，1： | 22 |
| 2 | Effect of pretreatment on Pd/Al_2O_3catalyst for catalytic oxidation of o-xylene at low temperature显示文摘The effect of pretreatment on Pd/Al2O3 catalysts for the catalytic oxidation of o-xylene at low temperature was studied by changing the pretreatment and testing conditions.The fresh and pretreated Pd/Al2O3 catalysts were characterized by transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS) and X-ray diffraction(XRD).The results showed that the pretreatment dramatically changed the Pd/PdO ratio and then significantly affected the Pd/Al2O3 activity;while the pretreatment had not much influence on Pd particle size.The Pd/Al2O3 pre-reduced at 300℃/400℃,which has fully reduced Pd species,showed the highest activity;while the fresh Pd/Al2O3,which has fully oxidized Pd species,presented the worst performance,indicating the Pd chemical state plays an important role in the catalytic activity for the o-xylene oxidation.It is concluded that metallic Pd is the active species on the Pd/Al2O3 catalyst for the catalytic oxidation of o-xylene at low temperature. | Shaoyong Huang Changbin Zhang Hong He | 2013 | Journal of Environmental Sciences2013，25，6： | 16 |
| 3 | Ecological footprint analysis based on RS and GIS in arid land显示文摘Sustainable development has become a primary objective for many countries and regions throughout the world now. The ecological footprint (EF) is a kind of concise method of quantifiably measuring the natural capital consumption and it can reflect the goal of sustainability. In this paper, the concept, the theory and method of ecological footprint are introduced. On this basis, the study brings forward the method of ecological footprint and capacity prediction. The method is employed for the ecological footprint prediction combining consumption model with population model and the technique is adopted for the ecological capacity (EC) prediction uniting the Geographical Cellular Automata (Geo CA) and Geographic Information System (GIS). The above models and methods are employed to calculate EF and EC in 1995 and 2000 and predict them in 2005 in Hexi Corridor. The result shows that EF is continually increasing, and EC ascended in the anterior 5 years and will descend in the posterior 5 years. This suit of method is of the character of accuracy and speediness. | CHANGBin XIONGLiya | 2005 | Journal of Geographical Sciences2005，15，1： | 13 |
| 4 | Monitoring early responses to irradiation with dual-tracer micro-PET in dual-tumor bearing mice显示文摘AIM: To monitor the early responses to irradiation in primary and metastatic colorectal cancer (CRC) with 18 Ffluorothymidine ( 18 F-FLT) and 18 F-fluorodeoxyglucose ( 18 F-FDG) small-animal position emission tomography (micro-PET). METHODS: The primary and metastatic CRC cell lines, SW480 and SW620, were irradiated with 5, 10 and 20, l l l , Gy. After 24 h, the cell cycle phases were analyzed. A dual-tumor-bearing mouse model of primary and metastatic cancer was established by injecting SW480 and SW620 cells into mice. micro-PET with 18 F-FLT and 18 F-FDG was performed before and 24 h after irradiation with 5, 10 and 20 Gy. The region of interest (ROI) was drawn over the tumor and background to calculate the ratio of tumor to non-tumor (T/NT) in tissues. Immunohistochemical assay and Western blotting were used to examine the levels of integrin β3, Ki-67, vascular endothelial growth factor receptor 2 (VEGFR2) and heat shock protein 27 (HSP27). RESULTS: The proportion of SW480 and SW620 cells in the G 2 -M phase was decreased with an increasing radiation dose. The proportion of SW480 cells in the G 0 -G 1 phase was increased from 48.33% ± 4.55% to 87.09% ± 7.43% (P < 0.001) and that of SW620 cells in the S-phase was elevated from 43.57% ± 2.65% to 66.59% ± 7.37% (P = 0.021). In micro-PET study, with increasing dose of radiation, 18 F-FLT uptake was significantly reduced from 3.65 ± 0.51 to 2.87 ± 0.47 (P = 0.008) in SW480 tumors and from 2.22 ± 0.42 to 1.76 ± 0.45 (P = 0.026) in SW620 tumors. 18 F-FDG uptake in SW480 and SW620 tumors was reduced but not significantly (F = 0.582, P = 0.633 vs F = 0.273, P = 0.845). Dose of radiation was negatively correlated with 18 F-FLT uptake in both SW480 and SW620 tumors (r = -0.727, P = 0.004; and r = -0.664, P = 0.009). No significant correlation was found between 18 F-FDG uptake and radiation dose in SW480 or SW620 tumors. HSP27 and integrin β3 expression was higher in SW480 than in SW620 tumors. The T/NT ratio for 18 F-FLT uptake was positively correlated with HSP27 and integrin β3 expression (r = 0.924, P = 0.004; and r = 0.813, P = 0.025). CONCLUSION: 18 F-FLT is more suitable than 18 F-FDG in monitoring early responses to irradiation in both primary and metastatic lesions of colorectal cancer. | Hui Wang, Jia-He Tian, Bai-Xuan Xu, Zhi-Wei Guan, ChangBin Liu, Rui-Min Wang, Ying-Mao Chen, Jin-Ming Zhang, Nuclear Medicine Department, The General Hospital of the Chinese People’s Liberation Army and Military Medical Postgraduate College, Beijing 100853, China Bo Liu, Department of Hepatobiliary Surgery, The General Hospital of the Chinese People’s Liberation Army and Military Medical Postgraduate College, Beijing 100853, China Bao-Lin Qu, Department of Radiation Oncology, The General Hospital of the Chinese People’s Liberation Army and Military Medical Postgraduate College, Beijing 100853, China | 2010 | World Journal of Gastroenterology2010，16，43： | 10 |
| 5 | Modeling and Optimal Design of 3 Degrees of Freedom Helmholtz Resonator in Hydraulic System显示文摘Three degrees of freedom (3-DOF) Helmholtz resonator which consists of three cylindrical necks and cavities connected in series (neck-cavity-neck-cavity-neck-cavity) is suitable to reduce flow pulsation in hydraulic system. A novel lumped parameter model (LPM) of 3-DOF Helmholtz resonator in hydraulic system is developed which considers the viscous friction loss of hydraulic fluid in the necks. Applying the Newton's second law of motion to the equivalent mechanical model of the resonator, closed-form expression of transmission loss and resonance frequency is presented. Based on the LPM, an optimal design method which employs rotate vector optimization method (RVOM) is proposed. The purpose of the optimal design is to search the resonator's unknown parameters so that its resonance frequencies can coincide with the pump-induced flow pulsation harmonics respectively. The optimal design method is realized to design 3-DOF Helmholtz resonator for a certain type of aviation piston pump hydraulic system. The optimization result shows the feasibility of this method, and the simulation under optimum parameters reveals that the LPM can get the same precision as transfer matrix method (TMM). | GUAN Changbin JIAO Zongxia | 2012 | Chinese Journal of Aeronautics2012，25，5： | 10 |
| 6 | Olivine-norite rock detected by the lunar rover Yutu-2 likely crystallized from the SPA-impact melt pool显示文摘Chang’E-4 landed in the South Pole-Aitken(SPA)basin,providing a unique chance to probe the composition of the lunar interior.Its landing site is located on ejecta strips in Von Karm´an crater that´possibly originate from the neighboring Finsen crater.A surface rock and the lunar regolith at 10 sites along the rover Yutu-2 track were measured by the onboard Visible and Near-Infrared Imaging Spectrometer in the first three lunar days of mission operations.In situ spectra of the regolith have peak band positions at 1 and 2μm,similar to the spectral data of Finsen ejecta from the Moon Mineralogy Mapper,which confirms that the regolith’s composition of the landing area is mostly similar to that of Finsen ejecta.The rock spectrum shows similar band peak positions,but stronger absorptions,suggesting relatively fresh exposure.The rock may consist of 38.1±5.4%low-Ca pyroxene,13.9±5.1%olivine and 48.0±3.1%plagioclase,referred to as olivine-norite.The plagioclase-abundant and olivine-poor modal composition of the rock is inconsistent with the origin of the mantle,but representative of the lunar lower crust.Alternatively,the rock crystallized from the impact-derived melt pool formed by the SPA-impact event via mixing the lunar crust and mantle materials.This scenario is consistent with fast-cooling thermal conditions of a shallow melt pool,indicated by the fine to medium-sized texture(<3 mm)of the rock and the SPA-impact melting model[Icarus 2012;220:730–43]. | Honglei Lin Zhiping He Wei Yang Yangting Lin Rui Xu Chi Zhang Meng-Hua Zhu Rui Chang Jinhai Zhang Chunlai Li Hongyu Lin Yang Liu Sheng Gou Yong Wei Sen Hu Changbin Xue Jianfeng Yang Jie Zhong Xiaohui Fu Weixing Wan Yongliao Zou | 2020 | National Science Review2020，7，5： | 9 |
| 7 | Remarkable promotion effect of trace sulfation on OMS-2nanorod catalysts for the catalytic combustion of ethanol显示文摘OMS-2 nanorod catalysts were synthesized by a hydrothermal redox reaction method using Mn SO4(OMS-2-SO4) and Mn(CH3COO)2(OMS-2-AC) as precursors. SO42--doped OMS-2-AC catalysts with different SO42-concentrations were prepared next by adding(NH4)2SO4solution into OMS-2-AC samples to investigate the effect of the anion SO42-on the OMS-2-AC catalyst. All catalysts were then tested for the catalytic oxidation of ethanol. The OMS-2-SO4 catalyst synthesized demonstrated much better activity than OMS-2-AC. The SO42-doping greatly influenced the activity of the OMS-2-AC catalyst, with a dramatic promotion of activity for suitable concentration of SO42-(SO4/catalyst = 0.5% W/W). The samples were characterized by X-ray diffraction(XRD), field emission scanning electron microscopy(FE-SEM), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS),inductively coupled plasma optical emission spectroscopy(ICP-OES), NH3-TPD and H2-TPR techniques. The results showed that the presence of a suitable amount of SO42-species in the OMS-2-AC catalyst could decrease the Mn–O bond strength and also enhance the lattice oxygen and acid site concentrations, which then effectively promoted the catalytic activity of OMS-2-AC toward ethanol oxidation. Thus it was confirmed that the better catalytic performance of OMS-2-SO4 compared to OMS-2-AC is due to the presence of some residual SO42-species in OMS-2-SO4 samples. | Jie Zhang Changbin Zhang Hong He | 2015 | Journal of Environmental Sciences2015，27，9： | 9 |
| 8 | Mutation of kri1l causes definitive hematopoiesis failure via PERK-dependent excessive autophagy induction显示文摘 | Xiao-E Jia Ke Ma Tao Xu Lei Gao Shuang Wu Cong Fu Wenjuan Zhang Zhizhang Wang Kaiyu Liu Mei Dong Changbin Jing Chunguang Ren Zhiwei Dong Yi Chen Yi Jin Qiuhua Huang Xing Chang Min Deng Li Li Lingfei Luo Jun Zhu Yongjun Dang Hung-Chun Chang Leonard I Zon Yi Zhou Saijuan Chen Weijun Pan | 2015 | Cell Research2015，25，8： | 8 |
| 9 | Surface modification of Ti-6Al-4V alloy by cathode assiting discharge setup and conventional plasma nitriding methods显示文摘In order to improve the wear resistance of titanium alloys,the potential of the plasma nitriding process with a cathode assiting discharge setup was examined.Ti6Al4V alloy was nitrided by the cathode assiting discharge nitriding(CAN) and conventional DC plasma nitriding(CPN) methods,respectively.The micro-topography,phase composition and cross-sectional microhardness distribution of two nitriding layers were studied comparatively.The sliding wear resistance of the nitriding layers was examined by a ball-on-disk test against Si3N4 balls.The results indicated that the surface roughness Ra of the CAN layer was about 1 order less than that of the CPN layer.In addition,the CAN surfaces possessed significantly greater wear resistance than the CPN layer at higher loads,and increased the wear resistance of Ti6Al4V alloy by about 2 orders due to the higher loading bearing ability,higher rate of TiN phase,greater surface microhardness and bigger microhardness improving depth.This is because the double glow discharge effect in CAN strengthened the density of the active nitrogen atoms and the nitriding efficiency.Moreover,the ion bombardment effect on the surface of the nitriding titanium alloy was reduced obviously. | TANG JinGang LIU DaoXin TANG ChangBin ZHANG XiaoHua | 2013 | Science China(Technological Sciences)2013，56，8： | 8 |
| 10 | Tribenuron-Methyl Induces Male Sterility through Anther-Specific Inhibition of Acetolactate Synthase Leading to Autophagic Cell Death显示文摘Tribenuron 甲基(TM ) 是禁止分支链的强大的 sulfonylurea 除草剂由指向 acetolactate synthase (ALS ) 的催化子单元(CSR1 ) 的氨基酸(BCAA ) 生合成。由在低剂量的 TM 的叶的喷洒的男绝育的选择正式就职广泛地在油菜籽(Brassica 马来麝) 为混合种子生产被使用了;然而,内在的机制仍然保持未知。这里,我们 reportgreater TM 累积和在花药的 BCAA 饥饿比在在 TM 申请以后的叶子和茎。csr1-1D (aCSR1 异种) 的组成或花药特定的表示消除了花药选择的 ALS 抑制并且在油菜籽和 Arabidopsis 颠倒了导致 TM 的男无菌的显型。TM 涂抹茎实验的结果,在叶肉或韧皮部由 TM 新陈代谢基因 Bel 的指向的表示在导致 TM 的男绝育的花药和回复与很少 TM 累积的观察结合了,建议叶水花的 TM 通过叶肉和韧皮部主要对花药极运输。显微镜学和 immunoblotting 揭示了那 autophagy,在房间死亡期间导致的一个体积降级过程,在导致 TM 的男无菌的花药并且由被提高花药特定 ALS 击倒。而且,导致 TM 的花粉流产被 autophagy 禁止者 3 麻省显著地禁止。这些数据最终建议 TM 对花药极运输,导致经由花药特定的 ALS 抑制的 BCAA 饥饿并且,,在花药的 autophagic 房间死亡。 | Lun Zhao Xue Jing Li Chen Yingjun Liu Yanan Su Tingting Liu Changbin Gao Bin Yi Jing Wen Chaozhi Ma Jinxing Tu Jitao Zou Tingdong Fu Jinxiong Shen | 2015 | Molecular Plant2015，8，12： | 7 |
| 11 | In situ adsorption-catalysis system for the removal of o-xylene over an activated carbon supported Pd catalyst显示文摘An activated carbon (AC) supported Pd catalyst was used to develop a highly effcient in situ adsorption-catalysis system for the removal of low concentrations of o-xylene. In this study, three kinds of Pd/AC catalysts were prepared and tested to investigate the synergistic effciency between adsorption and catalysis for o-xylene removal. The Pd/AC catalyst was first used as an adsorbent to concentrate dilute o-xylene at low temperature. After saturated adsorption, the adsorbed o-xylene was oxidized to CO2 and H2O by raising the temperature of the catalyst bed. The results showed that more than 99% of the adsorbed o-xylene was completely oxidized to CO2 over a 5% Pd/AC catalyst at 140°C. Brunauer-Emmett-Teller (BET) analysis, scanning electron microscopy (SEM), temperature-programmed desorption (TPD), and temperature-programmed oxidation (TPO) were applied to investigate the physical properties of o-xylene adsorption-desorption and the in situ adsorption-catalysis activity of the AC support and Pd/AC catalyst. A synergistic relationship between the AC support and the active Pd species for the removal of low concentrations of o-xylene was established. | HUANG Shaoyong, ZHANG Changbin, HE Hong Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. | 2009 | Journal of Environmental Sciences2009，21，7： | 6 |
| 12 | Antimicrobial activity of silver loaded MnO_2 nanomaterials with different crystal phases against Escherichia coli显示文摘Silver-loaded MnO_2 nanomaterials(Ag/MnO_2),including Ag/α-MnO_2,Ag/β-MnO_2,Ag/γ-MnO_2and Ag/δ-MnO_2 nanorods,were prepared with hydrothermal and impregnation methods.The bactericidal activities of four types of Ag/MnO_2 nanomaterials against Escherichia coli were investigated and an inactivation mechanism involving Ag^+ and reactive oxygen species(ROS)was also proposed.The bactericidal activities of Ag/MnO_2 depended on the MnO_2 crystal phase.Among these nanomaterials,Ag/β^-MnO_2 showed the highest bactericidal activity.There was a 6-log decrease in E.coli survival number after treatment with Ag/β^-MnO_2 for120 min.The results of 5,5-dimethyl-l-pyrroline-N-oxide spin-trapping measurements by electron spin resonance indicate OH and O_2^- formation with addition of Ag/β-MnO_2,Ag/γ-MnO_2 or Ag/δ-MnO_2.The strongest peak of OH appeared for Ag/β-MnO_2,while no OH or ·O_2^-signal was found over Ag/α-MnO_2.Through analysis of electron spin resonance(ESR) and Ag+elution results,it could be deduced that the toxicity of Ag^+ eluted from Ag/MnO_2 nanomaterials and ROS played the main roles during the bactericidal process.Silver showed the highest dispersion on the surface of β-MnO_2,which promoted ROS formation and the increase of bactericidal activity.Experimental results also indicated that Ag/MnO_2 induced the production of intracellular ROS and disruption of the cell wall and cell membrane. | Lian Wang Hong He Changbin Zhang Li Sun Sijin Liu Shaoxin Wang | 2016 | Journal of Environmental Sciences2016，28，3： | 6 |
| 13 | A case study of regional eco-hydrological characteristics in the Tao River Basin, northwestern China, based on evapotranspiration estimated by a coupled Budyko Equation-crop coefficient approach显示文摘In a case study in Tao River Basin, China, we derived a high spatial-resolution regional distribution of evapotranspiration(ET) using the single crop coefficient method and Budyko equation. We then further analyzed the spatio-temporal characteristics of this diverse eco-hydrological basin from 2001–2010. The results suggest that the single crop coefficient method based on leaf area index captures better spatial and temporal dynamics of the regional ET than did the Budyko Equation method. The rising temperature was the main reason for the increasing ET in the Tao River Basin during 2001–2010. Areas with high ET efficiency were distributed mainly in the areas where the vegetation coverage was high, and a lower runoff coefficient responded. The estimated spatial patterns of ET allowed an improved understanding of the eco-hydrological processes within the Tao River Basin and the method used might be generalized as a reference for future regional-scale eco-hydrological research. | LI ChangBin ZHANG XueLei QI JiaGuo WANG ShuaiBing YANG LinShan YANG WenJin ZHU GaoFeng HAO Qiang | 2015 | Science China Earth Sciences2015，58，11： | 5 |
| 14 | Facile synthesis of Ag-modified manganese oxide for effective catalytic ozone decomposition显示文摘O3 decomposition catalysts with excellent performance still need to be developed. In this study, Ag-modified manganese oxides(AgMnOx) were synthesized by a simple co-precipitation method. The effect of calcination temperature on the activity of MnOx and AgMnOxcatalysts was investigated. The effect of the amount of Ag addition on the activity and structure of the catalysts was further studied by activity testing and characterization by a variety of techniques. The activity of 8%AgMnOxfor ozone decomposition was significantly enhanced due to the formation of the Ag1.8 Mn8 O16 structure, indicating that this phase has excellent performance for ozone decomposition.The weight content of Ag1.8 Mn8 O16 in the 8%AgMnOxcatalyst was only about 33.76%, which further indicates the excellent performance of the Ag1.8 Mn8 O16 phase for ozone decomposition. The H2 temperature programmed reduction(H2-TPR) results indicated that the reducibility of the catalysts increased due to the formation of the Ag1.8 Mn8 O16 structure.This study provides guidance for a follow-up study on Ag-modified manganese oxide catalysts for ozone decomposition. | Xiaotong Li Jinzhu Ma Changbin Zhang Runduo Zhang Hong He | 2019 | Journal of Environmental Sciences2019，31，6： | 5 |
| 15 | Reduction of Cogging Torque and Electromagnetic Vibration Based on Different Combination of Pole Arc Coefficient for Interior Permanent Magnet Synchronous Machine显示文摘Cogging torque and electromagnetic vibration are two important factors for evaluating permanent magnet synchronous machine(PMSM)and are key issues that must be considered and resolved in the design and manufacture of high-performance PMSM for electric vehicles.A fast and accurate magnetic field calculation model for interior permanent magnet synchronous machine(IPMSM)is proposed in this article.Based on the traditional magnetic potential permeance method,the stator cogging effect and complex boundary conditions of the IPMSM can be fully considered in this model,so as to realize the rapid calculation of equivalent magnetomotive force(MMF),air gap permeance,and other key electromagnetic properties.In this article,a 6-pole 36-slot IPMSM is taken as an example to establish its equivalent solution model,thereby the cogging torque is accurately calculated.And the validity of this model is verified by a variety of different magnetic pole structures,pole slot combinations machines,and prototype experiments.In addition,the improvement measure of the machine with different combination of pole arc coefficient is also studied based on this model.Cogging torque and electromagnetic vibration can be effectively weakened.Combined with the finite element model and multi-physics coupling model,the electromagnetic characteristics and vibration performance of this machine are comprehensively compared and analyzed.The analysis results have well verified its effectiveness.It can be extended to other structures or types of PMSM and has very important practical value and research significance. | Feng Liu Xiuhe Wang Zezhi Xing Aiguo Yu Changbin Li | 2021 | CES Transactions on Electrical Machines and Systems2021，5，4： | 4 |
| 16 | Al-incorporation into Li7La3Zr2O12 solid electrolyte keeping stabilized cubic phase for all-solid-state Li batteries显示文摘We observe the influence of Al occupancies in Li sites on the formation process of the garnet solid electrolyte of Li_7La_3Zr_2O_(12)(LLZO).A direct incorporation of Al is first promoted in a Li-insufficient garnet solid electrolyte during the calcination process of 850°C and then the cubic phase of LLZO is obtained after successive annealing step of 1000°C.Comparing to pristine LLZO,Al incorporated LLZO shows less formation of Li_2CO_3,keeping crystallographic and physicochemical properties.This Al incorporation improves both the ionic conductivity and interfacial resistance to poisoning procedure. | Changbin Im Dongwon Park Hosung Kim Jaeyoung Lee | 2018 | Journal of Energy Chemistry2018，27，5： | 4 |
| 17 | Photocatalytic degradation of acid orange 7 in aqueous solution with La^(3+)-doped TiO_2 photocatalysts显示文摘Nanocrystalline La3+-doped TiO2 of 20-30 nm in size was prepared by a sol-gel technique. The photocatalytic ac- tivities of the samples were evaluated by the degradation of harmful acid orange 7(AO7) azo-dye in aqueous solution. The effects of La3+ ion implantation on the photocatalytic activity of TiO2 were also discussed. The results show that the La3+ content plays an essential role in affecting the photocatalytic activity of the La3+-doped TiO2 and the optimum content of La3+-doped is 1.0 wt.%. The photocatalytic activity of the samples with La3+-doped TiO2 is higher than that of pure TiO2 in the treatment of AO7 wastewater. The photodegradation effect of AO7 effluent is the best by means of La3+-doped TiO2 with 1.0% La3+. | XIA Changbin ZHOU Yi LI Xun ZENG Jing XU Ruiyin | 2005 | Rare Metals2005，24，4： | 4 |
| 18 | Studies on pathogen of explosive epidemic disease of shrimp Ⅱ. Purification of pathogen显示文摘 | Wang Jinxing, Liu Changbin, Zhang Hongwei, Zhao Shuangyi, Zhang Yanjun and Zhao Jing (College of Life Sciences, Shandong University, Jinan 250100, China) | 1998 | Acta Oceanologica Sinica1998，17，4： | 3 |
| 19 | Detrimental role of residual surface acid ions on ozone decomposition over Ce-modified γ-MnO2under humid conditions显示文摘In the study,the catalyst precursors of Ce-modifiedγ-MnO2 were washed with deionized water until the pH value of the supernatant was 1,2,4 and 7,and the obtained catalysts were named accordingly.Under space velocity of 300,000 hr-1,the ozone conversion over the pH=7 catalyst under dry conditions and relative humidity of 65%over a period of 6 hr was 100%and 96%,respectively.However,the ozone decomposition activity of the pH=2 and 4 catalysts distinctly decreased under relative humidity of 65%compared to that under dry conditions.Detailed physical and chemical characterization demonstrated that the residual sulfate ions on the pH=2 and 4 catalysts decreased their hydrophobicity and then restrained humid ozone decomposition activity.The pH=2 and 4 catalysts had inferior resistance to high space velocity under dry conditions,because the residual sulfate ion on their surface reduced their adsorption capacity for ozone molecules and increased their apparent activation energies,which was proved by temperature programmed desorption of O2 and kinetic experiments.Long-term activity testing,X-ray photoelectron spectroscopy and density functional theory calculations revealed that there were two kinds of oxygen vacancies on the manganese dioxide catalysts,one of which more easily adsorbed oxygen species and then became deactivated.This study revealed the detrimental effect of surface acid ions on the activity of catalysts under humid and dry atmospheres,and provided guidance for the development of highly efficient catalysts for ozone decomposition. | Xiaotong Li Jinzhu Ma Changbin Zhang Runduo Zhang Hong He | 2020 | Journal of Environmental Sciences2020，32，5： | 3 |
| 20 | Evidence of multistage late Quaternary strong earthquakes on typical segments of Longmenshan Active Fault Zone in Sichuan, China显示文摘Investigation of offset landforms and trench excavation are important means to acquire the evidence of multistage activities of active faults. Here we present the result of fault trough investigation in Beichuan County and the Pingtong Town of Pingwu County along the Longmenshan Central Fault Belt, as well as the result from trench excavation at the platform foreslope in Hanwang Town of Mianzhu County on the Longmenshan Front Range Fault Belt. These results show that at least three fault activity events, including the Wenchuan earthquake, occurred in the Beichuan fault trough, at least two, including the Wenchuan earthquake, at Pingtong fault trough, and 2-3 paleoearthquakes in the Hanwang trench. Among these three localities, the times of the last strong earthquake prior to Wenchuan earthquake at Beichuan fault trough and Hanwang trench are close, approximately 6000 years ago, i.e., greater than 5.8 ka and smaller than 6.63 ka ago. This provides the evidence of synchronous activity of the Central Fault Belt and the Front Range Fault Belt of the Longmenshan Active Fault Zone during the previous strong earthquake activities prior to Wenchuan earthquake. | JIANG WaLi XIE XinSheng ZHANG JinFa SUN ChangBin HUANG Wei SHENG Qiang FENG XiYing | 2009 | Science China Earth Sciences2009，52，9： | 3 |
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