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58篇 您的检索式:作者名="Yuxin CHENG"
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1Supersonic flow imaging via nanoparticles显示文摘Due to influence of compressibility,shock wave,instabilities,and turbulence on supersonic flows, current flow visualization and imaging techniques encounter some problems in high spatiotemporal resolution and high signal-to-noise ratio(SNR)measurements.Therefore,nanoparticle based planar laser scattering method(NPLS)is developed here.The nanoparticles are used as tracer,and pulse planar laser is used as light source in NPLS;by recording images of particles in flow field with CCD, high spatiotemporal resolution supersonic flow imaging is realized.The flow-following ability of nanoparticles in supersonic flows is studied according to multiphase flow theory and calibrating experiment of oblique shock wave.The laser scattering characteristics of nanoparticles are analyzed with light scattering theory.The results of theoretical and experimental studies show that the dynamic behavior and light scattering characteristics of nanoparticles highly enhance the spatiotemporal resolution and SNR of NPLS,with which the flow field involving shock wave,expansion,Mach disk,boundary layer,sliding-line,and mixing layer can be imaged clearly at high spatiotemporal resolution.ZHAO YuXin YI ShiHe TIAN LiFeng CHENG ZhongYu 2009Science China(Technological Sciences)2009,52,12:31
2The fractal measurement of experimental images of supersonic turbulent mixing layer显示文摘Flow visualization of supersonic mixing layer has been studied based on the high spatiotemporal resolution Nano-based Planar Laser Scattering(NPLS) method in SML-1 wind tunnel. The corresponding images distinctly reproduced the flow structure of laminar,transitional and turbulent region,with which the fractal measurement can be implemented. Two methods of measuring fractal dimension were introduced and compared. The fractal dimension of the transitional region and the fully developing turbulence region of supersonic mixing layer were measured based on the box-counting method. In the transitional region,the fractal dimension will increase with turbulent intensity. In the fully developing turbulent region,the fractal dimension will not vary apparently for different flow structures,which em-bodies the self-similarity of supersonic turbulence.ZHAO YuXin YI ShiHe TIAN LiFeng HE Lin CHENG ZhongYu 2008Science China(Physics,Mechanics & Astronomy)2008,51,8:24
3The experimental study of interaction between shock wave and turbulence显示文摘The interaction between shock wave and turbulence has been studied in supersonic turbulent mix layer wind tunnel. The interaction between oblique shock wave and turbulent boundary layer and the influence of large vortex in mix layer on oblique shock wave have been observed by NPLS technique. From NPLS image, not only complex flow structure is observed but also time-dependent supersonic flow visualization is realized. The mechanism of interaction between shock wave and turbulence is discussed based on high quality NPLS image.ZHAO YuXin YI ShiHe HE Lin CHENG ZhongYu TIAN LiFeng 2007Chinese Science Bulletin2007,52,10:18
4Study of density field measurement based on NPLS technique in supersonic flow显示文摘Due to the influence of shock wave and turbulence, supersonic density field exhibits strongly inhomogeneous and unsteady characteristics. Applying traditional density field measurement techniques to supersonic flows yields three problems: low spatiotemporal resolution, limitation of measuring 3D density field, and low signal to noise ratio (SNR). A new method based on Nano-based Planar Laser Scattering (NPLS) technique is proposed in this paper to measure supersonic density field. This method measures planar transient density field in 3D supersonic flow by calibrating the relationship between density and concentration of tracer particles, which would display the density fluctuation due to the influence of shock waves and vortexes. The application of this new method to density field measurement of supersonic optical bow cap is introduced in this paper, and the results reveal shock wave, turbulent boundary layer in the flow with the spatial resolution of 93.2 μm/pixel. By analyzing the results at interval of 5 μs, temporal evolution of density field can be observed.TIAN LiFeng YI ShiHe ZHAO YuXin HE Lin CHENG ZhongYu 2009Science China(Physics,Mechanics & Astronomy)2009,52,9:15
5BUD2,encoding an S-adenosylmethionine decarboxylase,is required for Arabidopsis growth and development显示文摘Polyamines 在在植物,而是他们的准确角色调整各种各样的发展过程被含有并且他们怎么管理这些过程尚待逃犯。我们这里报导浓密的 Arabidopsis 和矮子异种, bud2,哪个从编码 S-adenosylmethionine decarboxylases (SAMDC ) 的小基因家庭的一个成员的完全的删除的结果为在 polyamine 简历的不可缺少的中介的形成必要合成小径。bud2 植物在开花期,根,和叶柄扩大了脉管的系统,并且 polyamines 的改变的动态平衡。bud2 和 samdc1 的双异种,另一个 SAMDC 成员的击倒的异种,是胚胎致命,证明 SAMDC 为植物胚胎开始是必要的。我们的结果建议 polyamines 为更高的植物的正常生长和发展被要求。Chunmin Ge Xia Cui Yonghong Wang Yuxin Hu Zhiming Fu Dongfen Zhang Zhukuan Cheng Jiayang Li 2006Cell Research2006,16,5:14
6An experimental study of aero-optical aberration and dithering of supersonic mixing layer via BOS显示文摘The optical performance of supersonic mixing layer is heavily deteriorated by the aero-optical aberration and dithering of coherent structures, but current measuring methods limit the spatiotemporal resolution in relevant studies. A high resolution whole-field aero-optical aberration and dithering measuring method based on the Background Orient Schlieren (BOS) technique was studied. The systematic structure, sensitivity and resolution of BOS are analyzed in this paper. The aero-optical aberration and dithering of streamwise structures in supersonic mixing layers were quantificationally studied with BOS. The aberration field of spanwise structures revealed the ribbon-like aberration structures, which heavily restrict the optical performance of a mixing layer. The quantifications of aero-optical aberration and dithering are very important in studying aero-optical performance of supersonic mixing layer.ZHAO YuXin , YI ShiHe, TIAN LiFeng, HE Lin & CHENG ZhongYu College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China 2010Science China(Physics,Mechanics & Astronomy)2010,53,1:13
7Solar influenced late Holocene temperature changes on the northern Tibetan Plateau显示文摘Considerable efforts have been made to extend temperature records beyond the instrumental period through proxy reconstructions,in order to further understand the mechanisms of past climate variability.Yet,the global coverage of existing temperature records is still limited,especially for some key regions like the Tibetan Plateau and for earlier times including the Medieval Warm Period(MWP).Here we present decadally-resolved,alkenone-based,temperature records from two lakes on the northern Tibetan Plateau.Characterized by marked temperature variability,our records provide evidence that temperatures during the MWP were slightly higher than the modern period in this region.Further,our temperature reconstructions,within age uncertainty,can be well correlated with solar irradiance changes,suggesting a possible link between solar forcing and natural climate variability,at least on the northern Tibetan Plateau.HE YuXin LIU WeiGuo ZHAO Cheng WANG Zheng WANG HuanYe LIU Yi QIN XianYan HU QiHou AN ZhiSheng LIU ZhongHui 2013Chinese Science Bulletin2013,58,9:11
8A flow control study of a supersonic mixing layer via NPLS显示文摘The flow control of a supersonic mixing layer was studied in a supersonic mixing layer wind tunnel with convective Mach number (Mc) at 0.5. The passive control of the mixing layer was achieved by perturbation tapes on the trailing edge of the splitter plate. The control effects of 2D and 3D perturbation tapes with different sizes were compared. The mixing layer was visualized via NPLS,and the transient fine structures were identifiable in NPLS images,which were used to analyze the effects of flow control. The results show that the 2D tapes can enhance the 2D characteristic of the mixing layer,delaying mixing layer transition; and the 3D tapes can enhance the 3D characteristic of the mixing layer,advancing mixing layer transition. 3D structures of the mixing layer were visualized,and the H-type Λ vortexes were found with 3D tapes control.YI ShiHe HE Lin ZHAO YuXin TIAN LiFeng CHENG ZhongYu 2009Science China(Physics,Mechanics & Astronomy)2009,52,12:10
9Density field measurement and approximate reconstruction of supersonic mixing layer显示文摘The density field measurement of supersonic mixing layer based on the nanoparticle-based planar laser scattering method was studied.The calibration of experimental images was analyzed,and the relation between tracer particles concentration and local density of flowfield was calibrated with oblique shockwave experiment.According to the characteristic of mixing layer images,the influence of uneven light intensity distribution was calibrated.With these calibration methods,the density field of supersonic mixing layer with convective Mach number at 0.12 was measured.By analyzing the spanwise vortical structures and streamwise density field,the three dimensional(3D) density field was approximately reconstructed,which apparently reflected the 3D structure of supersonic mixing layer.ZHAO YuXin YI ShiHe TIAN LiFeng HE Lin CHENG ZhongYu 2010Chinese Science Bulletin2010,55,19:7
10MiRNA-365 and miRNA-520c-3p respond to risperidone treatment in first-episode schizophrenia after a 1 year remission显示文摘LIUSha YUAN Yan-bo GUAN Li-li WEI Hui CHENG Zhang HAN Xue YANG Lei PU Cheng-cheng YANG Fu-de LU zheng DENG Hong ZHAO Jing-ping YUXin 2013Chinese Medical Journal2013,,14:7
11Boosted electromagnetic wave absorption performance from synergistic induced polarization of SiC_(NWs)@MnO_(2)@PPy heterostructures显示文摘In the last decade,electromagnetic pollution has caused people’s considerable attention.Developing absorbing material with low cost,lightweight,simple preparation,and high electromagnetic attenuation efficiency has become a feasible means to deal with this problem.In this work,core–shell SiC_(NWs)@MnO_(2)@PPy(NWs:nanowires,PPy:polypyrrole)heterostructures composed of SiC nanowires core,MnO_(2)nanosheets inter-layer,and PPy coating were successfully prepared through chemical vapor deposition and two-step electrodeposition process.Taking advantage of the interfacial polarization and dipole polarization,the obtained product displays excellent electromagnetic wave absorption performances with the minimum reflection loss(RLmin)of−50.59 dB when the matching thickness is 2.41 mm,and the optimal effective absorption bandwidth(EAB)value reaches to 6.64 GHz at a matching thickness of 2.46 mm,revealing that the SiC_(NWs)@MnO_(2)@PPy nanocomposite could be served as a promising electromagnetic wave absorbing material.On the basis of systematic analysis concerning the electromagnetic parameters,the dissipation process of the incident electromagnetic wave was demonstrated reasonably,which may provide a referable preparation strategy for novel heterostructures,especially nonmagnetic lightweight absorbing material.Meng Zhang Laibin Zhao Wenxin Zhao Ting Wang Liying Yuan Yuying Guo Yuxin Xie Tingting Cheng Alan Meng Zhenjiang Li 2023Nano Research2023,16,2:4
12Individual thermal comfort prediction using classification tree model based on physiological parameters and thermal history in winter显示文摘Individual thermal comfort models based on physiological parameters could improve the efficiency of the personal thermal comfort control system.However,the effect of thermal history has not been fully addressed in these models.In this study,climate chamber experiments were conducted in winter using 32 subjects who have different indoor and outdoor thermal histories.Two kinds of thermal conditions were investigated:the temperature dropping(24-16℃)and severe cold(12℃)conditions.A simplified method using historical air temperature to quantify the thermal history was proposed and used to predict thermal comfort and thermal demand from physical or physiological parameters.Results show the accuracies of individual thermal sensation prediction was low to about 30%by using the PMV index in cold environments of this study.Base on the sensitivity and reliability of physiological responses,five local skin temperatures(at hand,calf,head,arm and thigh)and the heart rate are optimal input parameters for the individual thermal comfort model.With the proposed historical air temperature as an additional input,the general accuracies using classification tree model C5.0 were increased up by 15.5%for thermal comfort prediction and up by 29.8%for thermal demand prediction.Thus,when predicting thermal demands in winter,the factor of thermal history should be considered.Yuxin Wu Hong Liu Baizhan Li Risto Kosonen Shen Wei Juha Jokisalo Yong Cheng 2021Building Simulation2021,14,6:3
13Protective effects of Buyinqianzheng Formula on mitochondrial morphology by PINK1/Parkin pathway in SH-SY5Y cells induced by MPP^(+)显示文摘Objective:Buyinqianzheng Formula(BYQZF)is clinically employed in traditional Chinese medicine to treat Parkinson's disease(PD)by improving mitochondrial dysfunction.However,the underlying mechanisms by which BYQZF affects mitochondrial morphology remain unknown.Therefore,we observed the effects of BYQZF on mitochondria from the perspective of the PINK1/Parkin pathway.Methods:Cell survival rates were assessed by Cell Counting Kit-8 assay.Expression levels of PINK1 and Parkin mRNA were examined by qRT-PCR.Protein expression levels of PINK1,PINK1-Ser228,Parkin,Parkin-Ser65,Drp1,and Drp1-Ser637 were examined by western blotting.PINK1,Parkin,and MitoTracker?Red CMXRos(MTR)were stained by triple-labeled immunofluorescence,and observed under laser confocal microscopy.Results:Cell survival rate,mitochondrial form factor,mean length and number of mitochondrial network branches,mitochondrial activity,m RNA expression levels of PINK1 and Parkin,and protein expression levels of PINK1,Parkin,and Drp1-Ser637 were reduced after 1-methyl-4-phenylpyridinium(MPP^(+))intervention.In contrast,Pearson's correlation coefficients between PINK1 and Parkin,and between Parkin and MTR,as well as protein expression levels of PINK1-Ser228,Parkin-Ser65,and Drp1 increased significantly after MPP^(+) intervention.Treatment with BYQZF increased cell survival rate,mitochondrial form factor,mean length and number of mitochondrial network branches,mitochondrial activity,m RNA expression levels of PINK1 and Parkin,and expression of PINK1,Parkin,and Drp1-Ser637 proteins.Pearson's correlation coefficients between PINK1 and Parkin,and between Parkin and MTR,as well as protein expression levels of PINK1-Ser228,Parkin-Ser65,and Drp1 decreased after BYQZF treatment.Conclusion:These results demonstrate that BYQZF has a protective effect on mitochondrial molecular mechanisms in the PD cell model,and the mechanism is related to the PINK1/Parkin pathway.Haojie Ma Zhenyu Guo Cong Gai Cuicui Cheng Jinkun Zhang Yuxin Zhang Luping Yang Wandi Feng Yushan Gao Hongmei Sun 2020Journal of Traditional Chinese Medical Sciences2020,7,3:3
14An Equivalent Substitute Strategy for Constructing 3D Ordered Porous Carbon Foams and Their Electromagnetic Attenuation Mechanism显示文摘Three-dimensional(3D)ordered porous carbon is generally believed to be a promising electromagnetic wave(EMW)absorbing material.However,most research works targeted performance improvement of 3D ordered porous carbon,and the specific attenuation mechanism is still ambiguous.Therefore,in this work,a novel ultra-light egg-derived porous carbon foam(EDCF)structure has been successfully constructed by a simple carbonization combined with the silica microsphere template-etching process.Based on an equivalent substitute strategy,the influence of pore volume and specific surface area on the electromagnetic parameters and EMW absorption properties of the EDCF products was confirmed respectively by adjusting the addition content and diameter of silica microspheres.As a primary attenuation mode,the dielectric loss originates from the comprehensive effect of conduction loss and polarization loss in S-band and C band,and the value is dominated by polarization loss in X band and Ku band,which is obviously greater than that of conduction loss.Furthermore,in all samples,the largest effective absorption bandwidth of EDCF-3 is 7.12 GHz under the thickness of 2.13 mm with the filling content of approximately 5 wt%,covering the whole Ku band.Meanwhile,the EDCF-7 sample with optimized pore volume and specific surface area achieves minimum reflection loss(RL_(min))of−58.08 dB at 16.86 GHz while the thickness is 1.27 mm.The outstanding research results not only provide a novel insight into enhancement of EMW absorption properties but also clarify the dominant dissipation mechanism for the porous carbon-based absorber from the perspective of objective experiments.Meng Zhang Hailong Ling Ting Wang Yingjing Jiang Guanying Song Wen Zhao Laibin Zhao Tingting Cheng Yuxin Xie Yuying Guo Wenxin Zhao Liying Yuan Alan Meng Zhenjiang Li 2022Nano-Micro Letters2022,14,10:3
15The 1 PW/0.1 Hz laser beamline in SULF facility显示文摘In this paper,we report the recent progress on the 1 PW/0.1 Hz laser beamline of Shanghai Superintense Ultrafast Laser Facility(SULF).The SULF-1 PW laser beamline is based on the double chirped pulse amplification(CPA)scheme,which can generate laser pulses of 50.8 J at 0.1 Hz after the final amplifier;the shot-to-shot energy fluctuation of the amplified pulse is as low as 1.2%(std).After compression,the pulse duration of 29.6 fs is achieved,which can support a maximal peak power of 1 PW.The contrast ratio at-80 ps before main pulse is measured to be 2.5×10^-11.The focused peak intensity is improved by optimizing the angular dispersion in the grating compressor.The maximal focused peak intensity can reach 2.7×10^19W/cm2 even with an f/26.5 off-axis parabolic mirror.The horizontal and vertical angular pointing fluctuations in 1 h are measured to be 1.89 and 2.45μrad,respectively.The moderate repetition rate and the good stability are desirable characteristics for lasermatter interactions.The SULF-1 PW laser beamline is now in the phase of commissioning,and preliminary experiments of particle acceleration and secondary radiation under 300–400 TW/0.1 Hz laser condition have been implemented.The progress on the experiments and the daily stable operation of the laser demonstrate the availability of the SULF-1 PW beamline.Zongxin Zhang Fenxiang Wu Jiabing Hu Xiaojun Yang Jiayan Gui Penghua Ji Xingyan Liu Cheng Wang Yanqi Liu Xiaoming Lu Yi Xu Yuxin Leng Ruxin Li Zhizhan Xu 2020High Power Laser Science and Engineering2020,8,1:2
16Design, Synthesis, Biological Evaluation and SARs of Novel Anthranilic Diamides Derivatives Containing Amide, Carbamate, Urea, and Thiourea Moieties显示文摘In order to discover potential ryanodine receptor insecticides, 21 novel anthranilic diamides analogues (C, D, E,and F) containing amide, carbamate, urea, and thiourea moieties were designed and synthesized based on bioiso-steric approach. The biological assays against oriental armyworm (Mythirnna separata) and diamondback moth(Plutella xylostella) indicated that these compounds displayed moderate to excellent activities. Especially, com-pound D1 showed 100% larvicidal activities against oriental armyworm at 1.0 mg.L^-1, equivalent to the standardchlorantraniliprole (100%, 1.0 mg·L^-1). Moreover, the larvicidal activity of D1 against diamondback moth was100% at 0.1 mg·L^-1, more effective than that of chlorantraniliprole (90%, 0.1 mg·L^-1). Therefore, D1 can be used asa new lead structure for the development of insecticidal agents. The preliminary structure-activity relationshipshowed that the introduction od carbamate groups into 4-position on the benzene ring of the N-phenylpyrazole moi-ety has a positive effect on the larvicidal activities.Jingbo Liu Yuxin Li Xiulan Zhang Dandan Cheng Wei Wei Changchun Wu Yongtao Xie Lixia Xiong Zhengming Li 2017Chinese Journal of Chemistry2017,35,3:2
17Seabed deposition and erosion change and influence factors in the Yangshan Deepwater Port over the years显示文摘The seabed scouring and silting are very important to the construction of port and waterway engineering.Seabed deposition and erosion change is complicated due to the influence of sediment supply,human activities and other factors.The Yangshan Deepwater Port is the new deep water harbor,which is an important part of the Shanghai International Shipping Service Center.Its construction has received much attention.At present,the water depth from the 1st to the 3rd harbor district is currently suitable under regular dredging and tidal current action.The fourth harbor district will be built in the world’s largest fully-automated deep water wharf.In the study,bathymetry change of the entire sea area of the Yangshan Deepwater Port and the 4th harbor district(i.e.,PhaseⅣproject)waters were analyzed quantitatively using multiyear bathymetric,hydrological and sediment data.The results show that from 1998 to 2010,seabed changes are characterized by large volumes of erosion and sedimentation,which the southern part was deposited and the northern part was eroded in the inner harbor waters,but the seabed of the Kezhushan inlet was eroded.Seabed changes of PhaseⅣproject waters generally show a scour tendency in recent few years with the annual scour rate about 0.7 m.Among the many factors,the existence of Kezhushan inlet and its influence of the western water flow play an important positive role in water depth changes under the ebb tide action.Shuhua Zuo Hualiang Xie Xiaoming Ying Cheng Cui Yuxin Huang Huaiyuan Li Mingxiao Xie 2019Acta Oceanologica Sinica2019,38,7:2
18Translational Informatics for Parkinson’s Disease:from Big Biomedical Data to Small Actionable Alterations显示文摘Parkinson’s disease(PD)is a common neurological disease in elderly people,and its morbidity and mortality are increasing with the advent of global ageing.The traditional paradigm of moving from small data to big data in biomedical research is shifting toward big data-based identification of small actionable alterations.To highlight the use of big data for precision PD medicine,we review PD big data and informatics for the translation of basic PD research to clinical applications.We emphasize some key findings in clinically actionable changes,such as susceptibility genetic variations for PD risk population screening,biomarkers for the diagnosis and stratification of PD patients,risk factors for PD,and lifestyles for the prevention of PD.The challenges associated with the collection,storage,and modelling of diverse big data for PD precision medicine and healthcare are also summarized.Future perspectives on systems modelling and intelligent medicine for PD monitoring,diagnosis,treatment,and healthcare are discussed in the end.Bairong Shen Yuxin Lin Cheng Bi Shengrong Zhou Zhongchen Bai Guangmin Zheng Jing Zhou 2019Genomics, Proteomics & Bioinformatics2019,17,4:2
19Active canopy sensing of winter wheat nitrogen status: An evaluation of two sensor systems显示文摘Qiang Cao Yuxin Miao Guohui Feng Xiaowei Gao Fei Li Bin Liu Shanchao Yue Shanshan Cheng Susan L. Ustin R. Khosla 2014Computers and Electronics in Agriculture2014,,:1
20Active canopy sensor-based precision N management strategy for rice显示文摘Yinkun Yao Yuxin Miao Shanyu Huang Lei Gao Xiaobo Ma Guangming Zhao Rongfeng Jiang Xinping Chen Fusuo Zhang Kang Yu Martin Gnyp Georg Bareth Cheng Liu Liqin Zhao Wen Yang Huamin Zhu 2012Agronomy for Sustainable Development2012,,4:1
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