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| 1 | A novel approach for predicting inlet pressure of aircraft hydraulic pumps under transient conditions显示文摘Cavitation caused by insufficient suction is a major factor that influences the life of aircraft pumps. Currently, pressurizing the tank can solve the cavitation problem under steady largeflow conditions. However, this method is not always effective under transient conditions(from zero flow to full flow in a very short time). Moreover, to apply and design other measures, such as a boost impeller, the suction dynamics during the transient period must be investigated. In this paper,a novel approach based on the pressure wave propagation theory is proposed for predicting the inlet pressure of an aircraft pump under transient conditions. First, a dynamic model of a typical aircraft pump is established in the form of differential equations. Then, the transient flow model of the inlet line is described using momentum and continuity equations, and the governing equations are discretized by the method of characteristics and the finite difference method. The simulated results are in good agreement with the results from verification tests. Further simulation analysis indicates that the wave velocity and transient time may influence the inlet and reservoir pressure as well as the size of the inlet line. Finally, solutions for upgrading the inlet pressure are discussed. These solutions provide guidelines for designing inlet installations. | Yan WANG Hongkang DONG Yongling HE | 2019 | Chinese Journal of Aeronautics2019，32，11： | 4 |
| 2 | Mesoporous silica stabilized MOF nanoreactor for highly selective semi-hydrogenation of phenylacetylene via synergistic effect of Pd and Ru single site显示文摘Selective semi-hydrogenation of phenylacetylene to styrene is a crucial step in the polystyrene industry.Although Pd-based catalysts are widely used in this reaction due to their excellent hydrogenation activity,the selectivity for styrene remains a great challenge.Herein,we designed a mesoporous silica stabilized Pd-Ru@ZIF-8(MS Pd-Ru@ZIF-8)nanoreactor with novel Pd and Ru single site synergistic catalytical system for semi-hydrogenation of phenylacetylene.The nanoreactor exhibited a superior performance,achieving 98%conversion of phenylacetylene and 96%selectivity to styrene.Turnover frequency(TOF)of nanoreactor was up to as high as 2,188 h^(−1),which was 25 times and 5 times more than the single metal species catalysts,mesoporous silica stabilized Pd@ZIF-8 nanoreactor(MS Pd@ZIF-8),and mesoporous silica stabilized Ru@ZIF-8 nanoreactor(MS Ru@ZIF-8).This catalytic activity was attributed to the synergistic effect of Pd and Ru single site anchored strongly into the framework of ZIF-8,which reduced the desorption energy of styrene and increased the hydrogenation energy barrier of styrene.Importantly,since the ordered mesoporous silica was introduced into the nanoreactor shell to stabilize ZIF-8,MS Pd-Ru@ZIF-8 showed excellent reusability and stability.After the five cycles,the catalytical activity and selectivity still remained.This work provides insights for a synergistic catalytic system based on single-site active sites for selective hydrogenation reactions. | Zhenxing Li Mingliang Hu Jiahao Liu Weiwei Wang Yanjie Li Wenbin Fan Yixuan Gong Jiasai Yao Ping Wang Miao He Yongle Li | 2022 | Nano Research2022，15，3： | 2 |
| 3 | Dynamics of CO 2 partial pressure and CO 2 outgassing in the lower reaches of the Xijiang River, a subtropical monsoon river in China显示文摘 | Guanrong Yao Quanzhou Gao Zhengang Wang Xiakun Huang Tong He Yongling Zhang Shulin Jiao Jian Ding | 2007 | Science of the Total Environment2007，，1： | 1 |
| 4 | Antimalarial artesunate protects sepsis model mice against heat-killed Escherichia coli challenge by decreasing TLR4, TLR9 mRNA expressions and transcription factor NF-κB activation显示文摘 | Bin Li Rong Zhang Jun Li Lezhi Zhang Guofu Ding Ping Luo Shengqi He Yan Dong Weiwei Jiang Yongling Lu Hongwei Cao Jiang Zheng Hong Zhou | 2007 | International Immunopharmacology2007，，3： | 1 |
| 5 | Two-phase Flow of Liquid-gas in Diesel Fuel Injection System and Their Effect on Engine Performances显示文摘In this paper, by using high-speed camera, CCD camera, signal and graph acquisition system, and other experimental instruments, investigation on liquid-gas two-phase flow in diesel fuel injection system and their effect on engine performances were made. Emerging and bursting of cavitation in the cavity above pump delivery valve, in injection pipe, and in fuel trough of injector of the fuel injection system were observed and mechanism of cavitation were discussed. Effects of liquid-gas two-phase flow on propagation velocity of pressure wave of the system and on irregular injection were analyzed. Two types of cavitation, long Living time cavitation and short living time cavitation, in the cavity above pump delivery valve of diesel fuel injection system were observed. | Yongling He ,Zhihe Zhao ,Jianxin Liu ,Huiyong Du Mm Li ,Yongping Zong Luoyang Institute of Technology, Luoyang 471039, China E-mail: frick@mail.lyit.edu.cn | 2001 | Journal of Thermal Science2001，10，3： | 1 |
| 6 | A Heat Transfer Numerical Model for Thermoelectric Genera- tor With Cylindrical Shell Sterdy-State Conditions 显示文摘 | Zhou Minfeng HE Yongling CHEN Yanmin | 2014 | ing2014，，68： | 1 |
| 7 | Numerical investigation of effect of a centrifugal boost impeller on suction performance of an aircraft hydraulic pump显示文摘An integrated boost impeller can effectively improve the suction performance of an aircraft hydraulic pump(AHP).It must be designed very carefully;however,few studies thus far have investigated boost impellers.To explore the effect of the boost impeller,this study developed a three-dimensional computational fluid dynamics(CFD)model for an AHP based on the k-εturbulence model and full cavitation model.The results of verification tests demonstrated that the model is reliable for simulating the delivery characteristics of piston pumps and the boost capacity of the inlet impeller.Steady-state simulations reveal that the boost impeller can remarkably improve the suction performance and mitigate the cavitation damage due to insufficient fluid filling while only consuming a small proportion of the total input power.Transient-state simulations show that the pump with an impeller is more capable of catching up with a sudden increase in flow demand,and it has a lower suction flow ripple and impact.However,such a boost impeller also has some limitations such as magnifying the suction pressure fluctuation and having little effect on mitigating the cavitation caused by the back-flow jet. | Hongkang DONG Yongling HE Yan WANG Guiyue KOU | 2022 | Chinese Journal of Aeronautics2022，35，8： | 0 |
| 8 | First pig-to-human heart transplantation显示文摘The world’s first porcine-to-human heart transplantation was performed at the University of Maryland School of Medicine(Baltimore,MD,USA),where a genetically modified pig heart was successfully transplanted into a 57-year-oldman in the end stage of heart disease.After highly experimental surgery,the patient was able to move about freely in the absence of cardiopulmonary bypass assistance. | Wei Wang Wenbo He Yongle Ruan Qing Geng | 2022 | The Innovation2022，3，2： | 0 |
| 9 | Biological manipulation of eutrophication in West Yangchen Lake显示文摘This paper aims to share findings on nonclassical biomanipulation from a field study on eutrophic West Yangcheng(WY)Lake.In the forty years before 2009,cyanobacteria frequently bloomed in WY Lake,an event which has not occurred since 2009.The stocking density of filter-feeding carp was estimated to be more than 50 g/m^(3) in July after 2009,approximately double the amount observed before 2009,and the ratio of silver carp to bighead carp(SBR)increased from 0.8 to more than 1.6.Compared with the water quality between 2004 and 2007,the total nitrogen(TN)and the chlorophyll-a(Chl-a)concentration decreased while total phosphorus(TP)and transparency(SD)increased significantly after 2009(P<0.05).The decreasing Chl-a concentration was observed in Jul,Jun,May,Jul,and Mar in 2009,2010,2011,2016,and 2017,respectively.The Chl-a concentration was significantly negatively correlated with TP(P<0.05),and no significant correlation with TN was observed(P>0.05).A significant negative correlation was observed between fish yield and SD(P<0.05).The results also showed that filter-feeding carp more effectively restrained algae growth when SD was low.These results indicated that a high density of filter-feeding fish with increased SBR interfered with the driving effects of nutrients and temperature on the growth of algal biomass and then restrained bloom of algae.It may be necessary to take SD into consideration for determining the appropriate fish stocking density for the biomanipulation of algae. | Chunfang Cai Jie He Wen Chen Junbiao Zhang Qianqian Wang Xuehong Song Yuantu Ye Yongling Wang Ping Wu Xiamin Cao | 2019 | Aquaculture and Fisheries2019，4，5： | 0 |
| 10 | New Measurement of Thick Target Yield for Narrow Resonance at E_x=9.17MeV in (13)~C(p,γ)(14)~N Reaction显示文摘(13)^C(p,γ)(14)^N reaction is useful to study the evolution of stars in astrophysics,as it is one of the important process in the CNO(carbon-nitrogen-oxygen)cycle of nucleosynthesis.When the proton beam is accelerated to 1.747MeV,a narrow resonance with the radiation of high energyγray(9.17 MeV)will occur.Since integrated cross section is large and uniqueness to nitrogen,the 9.17MeV radiation is useful to study photonuclear reaction and detect nitrogenous explo-sives. | DANG Yongle WANG Naiyan GUO Bing HE Chuangye LIU Fulong FU Guangyong WU Di HAN Zhiyu SHEN Yangping | 2018 | 中国原子能科学研究院年报2018，，1： | 0 |
| 11 | Experimental Study of (197)~Au(γ,n) Photonuclear Reaction显示文摘As a standard testing experiment for photonuclear reaction study,the cross section of(197)Z^Au(γ,n)reaction has been investigated by using different kinds of gamma source.Berman etc.used positron annihilation in flight gamma source to measure the cross section of 197 Au(γ,n).Furthermore,the cross section of 197 Au(γ,n)reaction measured by bremsstrahlung gamma source was done on the facility of ELBE.Recently,the cross section of 197 Au(γ,n)has been remeausred by using laser Compton backscattering gamma source on the ring at AIST Tsukuba.By comparing with these gamma sources,(p,γ)resonance gamma source is better on monchromaticity.So it’s necessary to measure the cross section of 197 Au(γ,n)again by using monoenergetic gamma source. | DANG Yongle WANG Naiyan GUO Bing HE Chuangye LIU Fulong FU Guangyong WU Di | 2018 | 中国原子能科学研究院年报2018，，1： | 0 |
| 12 | Mechanisms of Accelerated Degradation in the Front Cells of PEMFC Stacks and Some Mitigation Strategies显示文摘The accelerated degradation in the front cells of a polymer electrolyte membrane fuel cell(PEMFC)stack seriously reduces the reliability and durability of the whole stack.Most researches only focus on the size and configuration of the gas intake manifold,which may lead to the maldistribution of flow and pressure.In order to find out the mechanisms of the accelerated degradation in the front cells,an extensive program of experimental and simulation work is initiated and the results are reported.It is found that after long-term lifetime tests the accelerated degradation in the front cells occurs in all three fuel cell stacks with different flow-fields under the U-type feed configuration.Compared with the rear cells of the stack,the voltage of the front cells is much lower at the same current densities and the membrane electrode assembly(MEA)has smaller active area,more catalyst particle agglomeration and higher ohmic impedance.For further investigation,a series of three dimensional isothermal numerical models are built to investigate the degradation mechanisms based on the experimental data.The simulation results reveal that the dry working condition of the membrane and the effect of high-speed gas scouring the MEA are the main causes of the accelerated degradation in the front cells of a PEM fuel cell stack under the U-type feed configuration.Several mitigation strategies that would mitigate these phenomena are presented:removing cells that have failed and replacing them with those of the same aging condition as the average of the stack;choosing a Z-type feed pattern instead of a U-type one;putting several air flow-field plates without MEA in the front of the stack;or exchanging the gas inlet and outlet alternately at a certain interval.This paper specifies the causes of the accelerated degradation in the front cells and provides the mitigation strategies. | LI Pengcheng PEI Pucheng HE Yongling YUAN Xing CHAO Pengxiang WANG Xizhong | 2013 | Chinese Journal of Mechanical Engineering2013，26，6： | 0 |
| 13 | Aerodynamic impact of train-induced wind on a moving motor-van显示文摘The newly-built single-level rail-cum-road bridge brings the issue of the aerodynamic impact of train-induced wind on road automobiles.This research introduced a validated computational fluid dynamics(CFD)model regarding this concern.Such an aerodynamic impact mechanism was explored;a relationship between the transverse distance between train and motor-van(hereinfafter referred to as van)and the aerodynamic effects on the van was explored to help the optimization of bridge decks,and the relationship between the automobile speed and aerodynamic variations of a van was fitted to help traffic control.The fitting results are accurate enough for further research.It is noted that the relative speed of the two automobiles is not the only factor that influences the aerodynamic variations of the van,even at a confirmed relative velocity,the aerodynamic variations of the van vary a lot as the velocity proportion changes,and the most unfavorable case shows an increase of over 40%on the aerodynamic variations compared to the standard case.The decay of the aerodynamic effects shows that not all the velocity terms would enhance the aerodynamic variations;the coupled velocity term constrains the variation amplitude of moments and decreases the total amplitude by 20%–40%. | Jiajun HE Huoyue XIANG Yongle LI Bin HAN | 2022 | Frontiers of Structural and Civil Engineering2022，16，7： | 0 |
| 14 | Correlation between Metroptosis Pathogenesis of Buffalo and Contents of Serum Calcium,Phosphorus and Antioxidation Levels显示文摘[Objective] The paper was to study the metroptosis pathogenesis of dairy buffalo.[Method]A total of 53 dairy buffaloes were selected to detect serum calcium,phosphorus,malondialdehyde(MDA) and total antioxidant capacity(TAC) levels.Dairy buffaloes were divided into metroptosis group(M) and healthy control group(UM) according to metroptosis situations of buffalo.The correlation between metroptosis of buffalo and calcium,phosphorus and oxidation/antioxidation levels in plasma was analyzed.[Result] The contents of serum calcium and phosphorus and oxidation/antioxidation level of dairy buffalo at the prenatal week and the calving day in M group were significantly lower than that in UM group.The TAC level of dairy buffalo in M group from the first three weeks to the calving day was significantly lower than that in UM group.The MDA level in M group was significantly higher than that in UM group.[Conclusion] The occurrence of postpartum metroptosis in buffalo was related to insufficient levels of calcium and phosphorus in prepartum buffalo,declined total antioxidation capacity and accumulation of peroxide products. | Zou Zhenxing Huang Yunfei Chai Qiaolian Hu Yongling Zhang Xiaojie Sun Yao Qin Guangsheng He Baoxiang | 2015 | Animal Husbandry and Feed Science2015，7，1： | 0 |
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