|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Research of optical rainfall sensor based on CCD linear array显示文摘Rainfall monitoring is one of the most important meteorological observation elements for the disaster weather. The maintenance of current tipping bucket rain gauge and weighing type rain gauge is a critical issue. The optical rainfall sensor based on CCD linear array is mainly studied in this paper. Because of the maintenance-free time and good adaptability,it can be widely used in the automatic rainfall monitoring in severe environment and have a good perspective in using. | YANG Bifeng LIU Yuyan LU Ying WU Shangqian | 2015 | Instrumentation2015，2，3： | 9 |
| 2 | Aerodynamic performance enhancement forflapping airfoils by co-flow jet显示文摘Introducing active flow control into the design of flapping wing is an effective way to enhance its aerodynamic performance.In this paper,a novel active flow control technology called Co-Flow Jet(CFJ)is applied to flapping airfoils.The effect of CFJ on aerodynamic performance of flapping airfoils at low Reynolds number is numerically investigated using Unsteady Reynolds Averaged Navier-Stokes(URANS)simulation with Spalart-Allmaras(SA)turbulence model.Numerical methods are validated by a NACA6415-based CFJ airfoil case and a S809 pitching airfoil case.Then NACA6415 baseline airfoil and NACA6415-based CFJ airfoil with jet-off and jet-on are simulated in flapping motion,with Reynolds number 70,000 and reduced frequency 0.2.As a result,CFJ airfoils with jet-on generally have better lift and thrust characteristics than baseline airfoils and jet-off airfoil when Cμgreater than 0.04,which results from the CFJ effect of reducing flow separation by injecting high-energy fluid into boundary layer.Besides,typical kinematic and geometric parameters,including the reduced frequency and the positions of the suction and injection slot,are systematically studied to figure out their influence on aerodynamic performance of the CFJ airfoil.And a variable Cμjet control strategy is proposed to further improve effective propulsive efficiency.Compared with using constant Cμ,an increase of effective propulsive efficiency by22.6%has been achieved by using prescribed variable CμNACA6415-based CFJ airfoil at frequency 0.2.This study may provide some guidance to performance enhancement for Flapping wing Micro Air Vehicles(FMAV). | Tao WU Bifeng SONG Wenping SONG Wenqing YANG Zhonghua HAN | 2020 | Chinese Journal of Aeronautics2020，33，10： | 7 |
| 3 | Light‐controlled astrocytes promote human mesenchymal stem cells toward neuronal differentiation and improve the neurological deficit in stroke rats显示文摘 | Jie Tu Fan Yang Jun Wan Yunhui Liu Jie Zhang Bifeng Wu Yafeng Liu Shaoqun Zeng Liping Wang | | Glia0，，1： | 1 |
| 4 | Effects of dietary oxidized frying oil on immune responses of spleen cells in rats 显示文摘 | LIN Bifeng WU Yingjun | 1997 | Nutr Res1997，17，4： | 1 |
| 5 | Concise synthesis of xanthones by the tandem etherification——Acylation of diaryliodonium salts with salicylates显示文摘An efficient synthetic method for multi-substituted xanthones was developed. The reaction of diaryliodonium salts and salicylates was employed for the preparation of the xanthones. This method proceeded through an intermolecular etherification-acylation to give target heterocycles in good yields(up to 91%). Multi-substituted xanthones were gained by shifting the substituent of salicylates or diaryliodonium | Gaoxiaozheng Liu Chao Wu Bifeng Chen Ru He Chao Chen | 2018 | Chinese Chemical Letters2018，29，6： | 0 |
| 6 | Temperature distribution of fluids in a two-section two-phase closed thermosyphon wellbore显示文摘Compared with a conventional single section two-phase closed thermosyphon(TPCT) wellbore, a two-section TPCT wellbore has better heat transfer performance, which may improve the temperature distribution of fluid in wellbores, increase the temperature of fluid in wellheads and even more effectively reduce the failure rate of conventional TPCT wellbores. Heat transfer performance of two-section TPCT wellbores is affected by working medium, combination mode and oil flow rate. Different working media are introduced into the upper and lower TPCTs, which may achieve a better match between the working medium and the temperature field in the wellbores. Interdependence exists between the combination mode and the flow rate of the oil, which affects the heat transfer performance of a two-section TPCT wellbore. The experimental results show that a two-section TPCT wellbore, with equal upper and lower TPCTs respectively filled with Freon and methanol, has the best heat transfer performance when the oil flow rate is 200 L/h. | Zhang Yufeng Zhao Lun Fan Zifei Wu Xiaodong Fu Libing Xu Bifeng Kong Fanshun Jiang Shengdong | 2014 | Petroleum Science2014，11，2： | 0 |
| 7 | Lift performance enhancement for flapping airfoils by considering surging motion显示文摘The flapping motion has a great impact on the aerodynamic performance of flapping wings. In this paper, a surging motion is added to an airfoil performing pitching-plunging combined motion to figure out how it influences the lift performance and flow pattern of flapping airfoils.Firstly, the numerical methods are validated by a NACA0012 airfoil pitching case and a NACA0012 airfoil plunging case. Then, the E377m airfoil which has typical geometric characteristics of the bird-like airfoil is selected as the calculation model to study how phase differences φ1 between surging motion and plunging motion affect the aerodynamic performance of flapping airfoils. The results show that the airfoil with surging motion has comprehensively better lift performance and thrust performance than the airfoil without surging motion when 15°< φ1< 90°. It is demonstrated that surging motion has a powerful ability to improve the aerodynamic performance of flapping airfoil by adjusting φ1. Finally, to further explore how flapping airfoil improves lift performance by considering surging motion, the flapping motions of E377m airfoil with the highest lift coefficient and lift efficiency are obtained through trajectory optimization. The surging motion is removed in the highest lift case and highest lift efficiency case respectively, and the mechanism that surging motion adjusts the aerodynamic force is analyzed in detail by comparing the vortex structure and kinematic parameters. The results of this paper help reveal the aerodynamic mechanism of bird flight and guide the design of Flapping wing Micro Air Vehicles(FMAV). | Tao WU Bifeng SONG Wenping SONG Wenqing YANG Dong XUE Zhonghua HAN | 2022 | Chinese Journal of Aeronautics2022，35，9： | 0 |
| 8 | Reduced Firing of Nucleus Accumbens Parvalbumin Interneurons Impairs Risk Avoidance in DISC1 Transgenic Mice显示文摘A strong animal survival instinct is to approach objects and situations that are of benefit and to avoid risk.In humans,a large proportion of mental disorders are accompanied by impairments in risk avoidance.One of the most important genes involved in mental disorders is disrupted-in-schizophrenia-1(DISC1),and animal models in which this gene has some level of dysfunction show emotion-related impairments.However,it is not known whether DISC1 mouse models have an impairment in avoiding potential risks.In the present study,we used DISC1-N terminal truncation(DISC1-N^(TM))mice to investigate risk avoidance and found that these mice were impaired in risk avoidance on the elevated plus maze(EPM)and showed reduced social preference in a three-chamber social interaction test.Following EPM tests,c-Fos expression levels indicated that the nucleus accumbens(NAc)was associated with risk-avoidance behavior in DISC1-N^(TM)mice.In addition,in vivo electrophysiological recordings following tamoxifen administration showed that the firing rates of fast-spiking neurons(FS)in the NAc were significantly lower in DISC1-N^(TM)mice than in wild-type(WT)mice.In addition,in vitro patch clamp recording revealed that the frequency of action potentials stimulated by current injection was lower in parvalbumin(PV)neurons in the NAc of DISC1-N^(TM)mice than in WT controls.The impairment of risk avoidance in DISC1-N^(TM)mice was rescued using optogenetic tools that activated NAcPV neurons.Finally,inhibition of the activity of NAcPV neurons in PV-Cre mice mimicked the risk-avoidance impairment found in DISC1-N^(TM)mice during tests on the elevated zero maze.Taken together,our findings confirm an impairment in risk avoidance in DISC1-N^(TM)mice and suggest that reduced excitability of NAc^(PV) neurons is responsible. | Xinyi Zhou Bifeng Wu Wenhao Liu Qian Xiao Wei He Ying Zhou Pengfei Wei Xu Zhang Yue Liu Jie Wang Jufang He Zhigang Zhang Weidong Li Liping Wang Jie Tu | 2021 | Neuroscience Bulletin2021，37，9： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员