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| 1 | Catalytic oxidation of low concentration formaldehyde over Pt/TiO_(2) catalyst显示文摘Formaldehyde(HCHO) is an important indoor pollutant.Catalytic oxidize low concentration HCHO is an effective way to eliminate indoor pollution.In this study,a series of Pt/TiO_(2) catalysts are prepared by impregnation and reduced by NaBH_4.The effects of loading amount of Pt and cry stal type of TiO_(2) on the physical and chemical properties and the catalytic performance in HCHO oxidation reaction are investigated.The results show that the quantity of active site and the oxygen vacancy of catalysts increa sed with increasing Pt content,which is beneficial to promote the further performance of catalysts.Nevertheless,with the further rises of Pt content,the specific surface area further decreases,and the proportion of Pt^(2+) species on the catalyst surface which is significant to catalytic properties also decreases,causing catalytic performance decreases.Compared with the catalyst supporting on rutile,the Pt/α-TiO_(2) catalyst supporting on anatase has larger specific surface area,more Pt^(2+) phase and easier to form oxygen vacancy in the support,which cause better catalytic performance.The catalyst with Pt content of0.1 wt% and supported by anatase TiO_(2) has the best catalytic performance.The HCHO conversion efficiency reaches 98% and 100% at 50℃ and 100 ℃, and the stabilization time is longer than 140 h. | Yuan Su Keming Ji Jiayao Xun Kan Zhang Ping Liu Liang Zhao | 2021 | Chinese Journal of Chemical Engineering2021，34，1： | 6 |
| 2 | NDRG4 prevents cerebral ischemia/reperfusion injury by inhibiting neuronal apoptosis显示文摘Cerebral ischemia is a major cause of mortality and long-term morbidity worldwide.NDRG4 has been shown to protect against cerebral ischemia,although the underlying mechanisms remain largely unclear.Here we found that NDRG4 expression was decreased in the brain tissues of ischemia/reperfusion(IR)rats,indicating increased apoptosis rates among cerebral cells.NDRG4 restoration via an adenovirus significantly attenuated cerebral infarct sizes and impairments in IR rats.Furthermore,adenovirus-mediated NDRG4 inhibited cell apoptosis in the brains of IR rats and regulated the expression of Bcl-2,Bax,caspase-3,and c-Fos.Moreover,we found that NDRG4 increased expression of BDNF,which is strongly related to cerebral ischemia and cellular apoptosis.Altogether,our findings demonstrate that NDRG4 protects cerebral IR injury by inhibiting cell apoptosis and regulates cerebral cell apoptosis by increasing BDNF expression.These results suggest that NDRG4 may be a therapeutic target for IR treatment. | Lan Wen Lei Liu Linyan Tong Jinfang Li Keming Zhang Qinbin Zhang Changqing Li | 2019 | Genes & Diseases2019，6，4： | 6 |
| 3 | Numerical and experimental investigation into hypersonic boundary layer transition induced by roughness elements显示文摘In this work, the Direct Numerical Simulation(DNS) and Oil-Film Interferometry(OFI)technique are used to investigate the hypersonic boundary layer transition induced by single and double roughness elements at Mach number 5. For single roughness, the DNS results showed that both horseshoe vortices and hairpin vortices caused by shear layer instability can affect the boundary layer instability. The generation of the near-wall unstable structure is the key point of boundary layer transition behind the roughness element. At the downstream of the roughness element, the interaction between horseshoe vortices and hairpin vortices will spread in the spanwise direction.For double roughness elements, the effect of the spacing between roughness elements on the transition is studied. It is found that the case of higher spacing between roughness elements is more effective for inducing transition than the lower one. The interaction between two adjacent roughness elements can suppress the evolution of horseshoe vortices in the downstream and trigger the instability of shear layer. Thus, the transition will be suppressed accordingly. | Hao DONG Shicheng LIU Xi GENG Song LIU Liming YANG Keming CHENG | 2019 | Chinese Journal of Aeronautics2019，32，3： | 6 |
| 4 | The effect of extrusion conditions on the properties and textures of AZ31B alloy显示文摘The effect of extrusion conditions on the tensile properties and texture of AZ31B alloy has been investigated by means of optical microscopy(OM),scanning electron microscopy(SEM),electron backscattered diffraction(EBSD)and tensile tests.It is found that the ultimate tensile strength(UTS),the yield strength(YS)and elongation(EN)of the extruded AZ31B alloy are more significantly influenced by extrusion velocities in contrast with temperature.Although the extrusion conditions are different,the {1102}<0101> texture is the chief texture in the AZ31B after extrusion.Moreover,the extrusion textures become scattered with increasing the temperatures at the same extrusion velocity.As the extrusion velocity is raised at the same temperature,the orientation density of textures increases and the separated textures become relatively concentrated.This leads to the changes of tensile properties at different extrusion conditions.©2017 Production and hosting by Elsevier B.V.on behalf of Chongqing University. | Qiang Liu Xiao Zhou Haitao Zhou Xiaohui Fan Keming Liu | 2017 | Journal of Magnesium and Alloys2017，5，2： | 4 |
| 5 | Discovery and its geological significance of the mantle- derived helium in the inclusions of the Ordovician oil-bearing reservoir rocks in the Huanghua depression,China显示文摘The values of the helium isotopes in the inclusions of the Ordovician reservoir rocks in the Kongxi buried hill belt in the Huanghua depression were first measured and the source of helium and its geological significance were investigated in comparison with those of the helium isotopes in the conclusions in the Ordovician rocks in the Ordos basin and the Tarim basin. The input of the mantle-derived helium into the inclusions in the carbonate reservoir rocks was found from the Konggu 3 well, the Konggu 4 well, and the Konggu 7 well in the Kongxi buried hill belt. The 3He/4He and R/Ra in the conclusions in the Ordovician oil-bearing reservoir rocks in the Konggu 7 well average 2.54×10-6(3) (sample quantity, the same below) and 1.82(3), respectively. The percent of the mantle-derived helium in the inclusions of the reservoir rocks in the Konggu 7 well reaches up to an average of 23.0%(3). The age of the contribution of the mantle-derived helium to the inclusions in the Kongxi buried hill belt is in the Late Triassic or the Early Tertiary. The finding of the mantle-derived helium shows that the interaction of the deep crust with mantle and the activity of deep faults occurred, the terrestrial heat flow value was high, and mantle-derived inorganic gas pools might be formed in the Kongxi buried hill belt. The finding of the mantle-derived helium in the inclusions of oil-bearing reservoir rocks also provides a new way for researching the activity of mantle-derived matter and its associated geological problems. | ZHANG Xiaobao XU Yongchang SUN Mingliang CHENG Keming LIU Wenhui LI Xiufen MA Liyuan | 2004 | Science China Earth Sciences2004，47，1： | 4 |
| 6 | Burial fluxes and sources of organic carbon in sediments of the central Yellow Sea mud area over the past 200 years显示文摘Long-term changes of composition,sources and burial fluxes of TOC(total organic carbon) in sediments of the central Yellow Sea mud area and their possible affecting factors are discussed in this paper.Firstly,similarity analysis is employed to confirm that the carbon burial features resulted from two collected cores are typical in the central Yellow Sea mud area where YSWC(Yellow Sea Warm Current) is prevalent.On this basis,the burial flux of TOC here was considered to be 235.5–488.4 μmol/(cm2?a) since the first industrial revolution,accounting for about 70%–90% among burial fluxes of TC(total carbon) in the sediments.Compared TOC/TC ratio in the two cores with that in other marine sediments worldwide,we suggest that the growth of calcareous/non-calcareous organisms and dissolution of IC(inorganic carbon) are important factors controlling the TOC/TC ratio in sediment.Results of two-end mixed model based on δ13C data indicate that marine-derived organic carbon(OCa)is the main part among total burial organic carbon which accounts for a ratio over 85%.Due to the high TOC/TC ratio in the two cores,TC in the sediments also mainly exists as OCa,and the proportion of OCa is about 60%–80%.Away from the shore and relatively high primary production in upper waters are the main reasons that OCa is predominant among all burial OC in sediments of the central Yellow Sea mud area.Burial of OC in this mud area is probably mainly influenced by the human activities.Although the economic development during the late 19 th century caused by the first industrial revolution in China did not obviously increase the TOC burial fluxes in the sediments,the rise of industry and agriculture after the founding of new China has clearly increased the TOC burial flux since 1950 s.Otherwise,we also realize that among TC burial fluxes,TIC account for about 10%–30% in sediments of the central Yellow Sea mud area,so its burial could not be simply ignored here.Distinct from TOC burial,long-term TIC burial fluxes variations relate with climate changes more closely:the East Asian summer monsoon may influence the strength of the Huanghe River(Yellow River) flood,which could further affect the transport of terrestrial IC from land to the central Yellow Sea as well as the burial of these IC in the sediments. | YANG Shu YANG Qian LIU Sai CAI Deling QU Keming SUN Yao | 2015 | Acta Oceanologica Sinica2015，34，10： | 3 |
| 7 | The study of methanol aromatization on transition metal modified ZSM-5 catalyst显示文摘In this article, transition metals of Cu, La and Zn were used as adjuvant to prepare modified HZSM-5 by impregnation method. The catalysts were characterized by XRD, BET, NH_3-TPD and Py-IR to reveal the microstructure and acid property. The catalysis performances of methanol aromatization of catalysts were investigated in a fixed-bed reactor. The results show that the strength and distribution of acid center of these catalysts are significantly influenced by the species of transition metal. There are more mediate strong Lewis acid center in Zn modified HZSM-5 catalyst and therefore exhibits higher selectivity to aromatic, benzene, toluene and xylenes in the MTA reaction.. | Keming Ji Jiayao Xun Ping Liu Qingwen Song Junhua Gao Kan Zhang Jingyuan Li | 2018 | Chinese Journal of Chemical Engineering2018，26，9： | 2 |
| 8 | Ecophysiological responses of two closely related Magnoliaceae genera to seasonal changes in subtropical China显示文摘Aims Plants use a variety of hydraulic strategies to adapt to seasonal drought that differ by species and environmental conditions.The early-diverging Magnoliaceae family includes two closely related genera with contrasting leaf habits,Yulania(deciduous)and Michelia(evergreen),which naturally inhabit temperate and tropi-cal regions,respectively.Here,we evaluate the hydraulic strategy of species from both genera that have been ex situ conserved in a subtropical region to determine how they respond to the novel cool-dry season climatic pattern.Methods We measured ecophysiological traits in five Michelia and five Yulania species conserved in the South China Botanical Garden in both wet and dry season conditions and monitored the whole-year sap flow for four of these species.Important Findings We found that Magnoliaceae species that have been ex situ con-served in a subtropical climate did not suffer from excessive water stress due to the mild drought conditions of the dry season and the ecophysiological adjustments the species made to avoid this stress,which differed by leaf habit.Specifically,deciduous species com-pletely shed their leaves during the dry season,while evergreen species decreased their turgor loss points,dry mass based photo-synthetic rates,stomatal conductance and specific leaf areas(SLAs)compared to wet season measurements.In comparing the two dis-tinct leaf habits during the wet season,the leathery-leaved evergreen species had higher leaf hydraulic conductance and leaf to sapwood area ratios than the papery-leaved deciduous species,while the deciduous species had greater hydraulic conductivity calculated on both a stem and leaf area basis,dry mass based photosynthetic rates,leaf nutrients,SLAs and stomatal sizes than the evergreen species.Interestingly,species from both genera maintained similar sap flow in the wet season.Both photosynthetically active radia-tion and vapour pressure deficit affected the diurnal patterns of sap flow in the wet season,while only vapour pressure deficit played a dominant role in the dry season.This study reveals contrasting hydraulic strategies in Yulania and Michelia species under subtropi-cal seasonal conditions,and suggests that these ecophysiological adjustments might be affected more by leaf habit than seasonality,thus reflecting the divergent evolution of the two closely related genera.Furthermore,we show that Magnoliaceae species that are ex situ conserved in a subtropical climate are hydraulically sound,a finding that will inform future conservation efforts of this ancient family under the threat of climatic change. | Hui Liu Liwei Zhu Qiuyuan Xu Marjorie R.Lundgren Keming Yang Ping Zhao Qing Ye | 2018 | Journal of Plant Ecology2018，11，3： | 2 |
| 9 | Synthesis and characterization of BZSM-5 and its catalytic performance in the methanol to hydrocarbons reaction显示文摘Five kinds of BZSM-5 molecular sieve with different Si/B ratio and a SiZSM-5 molecular sieve were prepared by hydrothermal synthesis method followed by acid exchange and pelletization.The samples were characterized by XRD,SEM,FT-IR,ICP,low temperature N_(2) physical adsorption and desorption,NH3-TPD and Py-IR.The catalytic performance in the reaction of methanol to hydrocarbons was evaluated in the fixed bed reactor.Compared with SiZSM-5,the amount and strength of Bronsted(B)acid were enhanced by introducing skeleton boron and the activity of the catalyst was greatly improved.The characterization and evaluation results indicated that the BZSM-5 catalyst synthesized from the gel of SiO_(2)/B2 O320 with Si/B ratio 74.48 had modest acidity strength,acid amount of 0.18 mmol NH3·g^(-1) and large mesopore volume of 0.23 cm3·g^(-1).The B acid ratio was higher and the acid strength of BZSM-5 was weaker than that of AIZSM-5,which could inhibit the deep coke formation and increase the activity stability.B-2 had the best lifetime which could reach 672 h under the same evaluation reaction conditions,due to the best matching of moderate acidity and good diffusion properties. | Junhua Gao Keming Ji Hao Zhou Jiayao Xun Zenghou Liu Kan Zhang Ping Liu | 2021 | Chinese Journal of Chemical Engineering2021，34，7： | 2 |
| 10 | A note on the Bahadur representation of sample quantiles for a - mixing random variables 显示文摘 | Guodong Xing Shunchao Yang Yah Liu Keming Yu | 2012 | Monatshefte ftir Mathematik2012，165，： | 1 |
| 11 | Application of chaos mind evolutionary algorithm in antenna arrays synthesis显示文摘 | Liu Jianxia Li Nan Xie Keming | 2010 | J of Computers2010，5，5： | 1 |
| 12 | Testing a Dynamic Complex Hypothesis in the Analysis of Land Use Impact on Lake Water Quality显示文摘 | QingHai Guo KeMing Ma Liu Yang Kate He | 2010 | Water Resources Management2010，，7： | 1 |
| 13 | SCN1A, SCN1B, and GABRG2 gene mutation analysis in Chinese families with generalized epilepsy with febrile seizures plus显示文摘 | Huihui Sun Yuehua Zhang Jianmin Liang Xiaoyan Liu Xiuwei Ma Husheng Wu Keming Xu Jiong Qin Yu Qi Xiru Wu | 2008 | Journal of Human Genetics2008，，8： | 1 |
| 14 | Dynamic Modeling and Adaptive Fast Nonsingular Terminal Sliding Mode Control for Satellite with Double Rotary Payloads显示文摘A robust attitude control methodology is proposed for satellite system with double rotary payloads.The dynamic model is built by the Newton-Euler method and then the dynamic interconnection between satellite′s main body and payloads is described precisely.A nonlinear disturbance observer is designed for satellite′s main body to estimate disturbance torque acted by motion of payloads.Meanwhile,the adaptive fast nonsingular terminal sliding-mode attitude stabilization controller is proposed for satellite′s main body to quicken convergence speed of state variables.Similarly,the adaptive fast nonsingular terminal sliding-mode attitude maneuver controller is designed for each payload to weaken the disturbance effect of motion of satellite′s main body.Simulation results verify the effectiveness of the proposed method. | Xu Chen Lu Yuping Yao Keming Liu Yanbin Xiao Dibo | 2016 | Transactions of Nanjing University of Aeronautics and Astronautics2016，33，3： | 1 |
| 15 | Syn- thesis and Characterization of a Series of 2-Aminopyridine Nickel( Ⅱ ) Complexes and Their Catalytic Properties Toward Ethylene Polymerization 显示文摘 | Huang Zengfang Song Keming Liu Fengshou | 2008 | J Polym Sci Part A : Polymer Chem2008，46，5： | 1 |
| 16 | Therapeutic mechanisms of Tongmai Dasheng Tablet on tripterygium glycosides induced rat model for premature ovarian failure显示文摘 | Yu Fu Zhengang Zhao Yeke Wu Keming Wu Xiaouan Xu Yue Liu Chongyi Tong | 2011 | Journal of Ethnopharmacology2011，，1： | 1 |
| 17 | Path- ological and physiological identification of race C of Bipo- laris rnaydis in China 显示文摘 | WEI Jiankun LIU Keming CHEN Junpeng | 1988 | Phytopathology1988，78，5： | 1 |
| 18 | Extraction and antioxidant activities of intracellular polysaccharide from Pleurotus sp. mycelium显示文摘 | Xiaonan Liu Bo Zhou Rongshan Lin Le Jia Peng Deng Keming Fan Guoyi Wang Li Wang Jianjun Zhang | 2010 | International Journal of Biological Macromolecules2010，，2： | 1 |
| 19 | Characteristics of Se-Enriched Mycelia by Stropharia rugoso-annulata and its Antioxidant Activities in vivo显示文摘 | Zhen Song Le Jia Feng Xu Fanyun Meng Peng Deng Keming Fan Xiaonan Liu | 2009 | Biological Trace Element Research2009，，1： | 1 |
| 20 | Influenza virus vaccine expressing fusion and attachment protein epitopes of respiratory syncytial virus induces protective antibodies in BALB/c mice显示文摘 | Chengrong Bian Shuzhen Liu Na Liu Guangzhou Zhang Li Xing Yingwei Song Yueqiang Duan Hongjing Gu Ya Zhou Peirui Zhang Zhiwei Li Keming Zhang Zhaohai Wang Shaogeng Zhang Xiliang Wang Penghui Yang | 2014 | Antiviral Research2014，，： | 1 |
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