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| 1 | An experimental study exploring the influencing factors for ultrasonic-assisted extraction of flavonoid compounds from leaves of Amorpha fruticosa L.显示文摘In this paper,the ultrasonic-assisted extraction process of flavonoid compounds from leaves of Amorpha fruticosa is optimized.In single factor experiments,solid/liquid ratios,ultrasonic power,ethanol concentrations and extraction cycles were experimental factors.Box–Behnken central composite design and RSM analyzed the effects of the four factors on the yield of total flavonoids.The optimal extraction parameters were solid/liquid ratio 1:50 g/mL,ultrasonic power 316 W,ethanol concentration 50%,4 extraction cycles.In the optimized condition,the estimated value of the regression model was 66.6456 mg/g while the measured value was 66.4329 mg/g. | Jingyao Tian Siddique Muhammad Ai Chen Peng Chen Jinghong Wang Chengwu Yang Hui Yuan Zhensheng Wang | 2019 | Journal of Forestry Research2019，30，5： | 14 |
| 2 | Pathways related to PMA-differentiated THP1 human monocytic leukemia cells revealed by RNA-Seq显示文摘Previous analyses have reported that the human monocytic cell line THP1 can be differentiated into cells with macrophage-like characteristics by phorbol 12-myristate 13-acetate(PMA). However, little is known about the mechanism responsible for regulating this differentiation process. Here, we performed high-throughput RNA-Seq analysis to investigate the genes differently expressed in THP1 cells treated with and without PMA and examined those that may be responsible for the PMA-induced differentiation of monocytes into macrophages. We found 3,000 genes to be differentially expressed after PMA treatment. Gene ontology analysis revealed that genes related to cellular processes and regulation of biological processes were significantly enriched. KEGG analysis also demonstrated that the differentially expressed genes(DEGs) were significantly enriched in the PI3K/AKT signaling pathway and phagosome pathway. Importantly, we reveal an important role of the PI3K/AKT pathway in PMA-induced THP1 cell differentiation. The identified DEGs and pathways may facilitate further study of the detailed molecular mechanisms of THP1 differentiation. Thus, our results provide numerous potential therapeutic targets for modulation of the differentiation of this disease. | ZENG ChengWu WANG WenTao YU XiBao YANG LiJian CHEN ShaoHua LI YangQiu | 2015 | Science China(Life Sciences)2015，58，12： | 7 |
| 3 | Investigation on Multiple Cylindrical Holes Casing Treatment for Transonic Axial Compressor Stability Enhancement显示文摘Casing treatment is one possible way of regaining axial compressor operating range. However, most of casing treatments extend the operating range with the cost of efficiency penalty. A new form of multiple cylindrical holes casing treatment(MHCT) with pre-swirl blowing for the NASA Rotor-37 has been designed based on profound understanding of the stall inception. Unsteady numerical simulations have been performed for Rotor-37 with and without MHCT. Parametric studies of the total extraction holes area and their axial locations show that the compressor performance deteriorates as the area ratio increases but the stall margin is extended and there is an optimum extraction holes axial location for stall margin extending. The better configuration of MHCT could extend the stall margin by 6.2% with only 0.23% peak efficiency reduction. Detailed analysis of the physical mechanism behind the stall margin improvement shows that the casing treatment could eliminate the passage blockage by suppressing breakup of tip leakage vortex and decrease the blade load in tip region, which both contribute to improve stall margin of transonic axial compressors. | YANG Chengwu ZHAO Shengfeng LU Xingen HAN Ge ZHU Junqiang | 2014 | Journal of Thermal Science2014，23，4： | 6 |
| 4 | ANALYTICAL SOLUTIONS TO STRESS CONCENTRATION PROBLEM IN PLATES CONTAINING RECTANGULAR HOLE UNDER BIAXIAL TENSIONS显示文摘The stress concentration problem in structures with a circular or elliptic hole can be investigated by analytical methods. For the problem with a rectangular hole, only approximate results are derived. This paper deduces the analytical solutions to the stress concentration problem in plates with a rectangular hole under biaxial tensions. By using the U-transformation technique and the finite element method, the analytical displacement solutions of the finite element equations are derived in the series form. Therefore, the stress concentration can then be discussed easily and conveniently. For plate problem the bilinear rectangular element with four nodes is taken as an example to demonstrate the applicability of the proposed method. The stress concentration factors for various ratios of height to width of the hole are obtained. | Yi Yang Jike Liu Chengwu Cai | 2008 | Acta Mechanica Solida Sinica2008，21，5： | 4 |
| 5 | Research on the degradation mechanism of pyridine in drinking water by dielectric barrier discharge显示文摘Pyridine, an important chemical raw material, is widely used in industry, for example in textiles,leather, printing, dyeing, etc. In this research, a dielectric barrier discharge(DBD) system was developed to remove pyridine, as a representative type of nitrogen heterocyclic compound in drinking water. First, the influence of the active species inhibitors tertiary butanol alcohol(TBA),HCO_3^-, and CO_3^(2-)on the degradation rate of pyridine was investigated to verify the existence of active species produced by the strong ionization discharge in the system. The intermediate and final products generated in the degradation process of pyridine were confirmed and analyzed through a series of analytical techniques, including liquid chromatography–mass spectrometry(LC–MS), high performance liquid chromatography(HPLC), ion chromatography(IC), total organic carbon(TOC) analysis, ultraviolet(UV) spectroscopy, etc. The results showed that the degradation of pyridine was mainly due to the strong oxidizing power of ozone and hydroxyl radical produced by the DBD system. Several intermediate products including 3-hydroxyl pyridine, fumaric acid, 2, 3-dihydroxypyridine, and oxalic acid were detected. Nitrogen was removed from the pyridine molecule to form nitrate. Through analysis of the degradation mechanism of pyridine, the oxidation pathway was deduced. The study provided a theoretical and experimental basis for the application of DBD strong ionization discharge in treatment of nitrogen heterocyclic compounds in drinking water. | Yang Li Rongjie Yi Chengwu Yi Biyun Zhou Huijuan Wang | 2017 | Journal of Environmental Sciences2017，29，3： | 4 |
| 6 | Summarizing the Methods of Determination of Rational Completion Status of Cable-Stayed Bridges显示文摘Cable-stayed bridge is a high-order hyperstatic structure. The size of cable force affects the stress of the structure greatly. The key problem to determine the rational completion status of cable-stayed bridges is how to control cable force on completion status. Surrounding this problem, domestic and foreign experts and scholars have done a lot of favorable work and obtained much achievement. On the basis of comprehensive reading domestic and foreign relative documentation, the author of this article classifies rationally the current researching achievement, comments and compares advantages and disadvantages of each method and lists two synthetic methods’ detail steps and puts forward the researching emphasis of the field will deflect to synthesis several methods to determine the rational completion status of cable-stayed bridges. | Yang Jun Shen Chengwu Sheng Jun | 2006 | 工程科学(英文版)2006，4，4： | 2 |
| 7 | Effects of surface roughness on the aerodynamic performance of a high subsonic compressor airfoil at low Reynolds number显示文摘The aerodynamic performance of compressor airfoil is significantly affected by the surface roughness at low Reynolds number(Re).In the present study,numerical simulations have been conducted to investigate the impact of surface roughness on the profile loss of a high subsonic compressor airfoil at Re=1.5×10^(5).Four roughness locations,covering 10%,30%,50%and 100%of the suction surface from the leading edge and seven roughness magnitudes(Ra)ranging from 52 to525 lm were selected.Results showed that the surface roughness mainly determined the loss generation process by influencing the structure of the Laminar Separation Bubble(LSB)and the turbulence level near the wall.For all the roughness locations,the variation trend for the profile loss with the roughness magnitude was similar.In the transitionally rough region,the negative displacement effect of the LSB was suppressed with the increase of roughness magnitude,leading to a maximum decrease of 14.6%,16.04%,16.45%and 10.20%in the profile loss at Ra=157 lm for the four roughness locations,respectively.However,with a further increase of the roughness magnitude in the fully rough region,the stronger turbulent dissipation enhanced the growth rate of the turbulent boundary layer and increased the profile loss instead.By comparison,the leading edge roughness played a dominant role in the boundary layer development and performance variation.To take fully advantage of the surface roughness reducing profile loss at low Re,the effects of roughness on suppressing LSB and inducing strong turbulent dissipation should be balanced effectively. | Mingyang WANG Chengwu YANG Ziliang LI Shengfeng ZHAO Yanfeng ZHANG Xin’gen LU | 2021 | Chinese Journal of Aeronautics2021，34，3： | 2 |
| 8 | Effect of Non-Axisymmetric End Wall on a Highly Loaded Compressor Cascade in Multi-Conditions显示文摘As an effective method to influence end wall flow field,non-axisymmetric profiled end wall can improve the aerodynamic performance of compressor cascades.For a highly loaded low pressure compressor cascade,called V103,the study found the optimal non-axisymmetric profiled end wall decreases total pressure loss coefficient by 4.57%,5.48%and 3.04%under incidences of–3°,0°,and 3°,respectively,compared with those of the planar end wall.The optimal non-axisymmetric profiled end wall changes the structure of secondary flow in hub region,generating a corner vortex near suction surface,inhibiting the development of the passage vortex towards suction surface and reducing flow separation.When the inlet Mach numbers are 0.62 and 0.72,the total pressure loss coefficient decreases by 3.19%and 4.58%for optimal non-axisymmetric profiled end wall compared with those of the planar end wall.Though optimal non-axisymmetric profiled end wall increases total pressure loss near hub region in blade passage under different inlet Mach numbers,the peak value and region of high loss coefficient above 10%span in blade passage significantly decrease.In addition,different incidences affect the secondary flow streamlines and vortex structure near the cascade hub region,however,different inlet Mach numbers hardly change the secondary flow streamlines and vortex structure.In short,the optimal non-axisymmetric profiled end wall shows better aerodynamic performance than the planar end wall for the highly loaded compressor cascade in multi-conditions. | HUANG Song YANG Chengwu LI Ziliang HAN Ge ZHAO Shengfeng LU Xin’gen | 2021 | Journal of Thermal Science2021，30，4： | 2 |
| 9 | H∞ and positive-real control for linear neutral delay systems 显示文摘 | Xu Shengyuan Lam J Yang Chengwu | 2001 | IEEE Trans Automat Contr2001，46，8： | 1 |
| 10 | H∞and Positive-Real Control for Linear Neutral Delav Systems显示文摘 | Xu Shengyuan James Lamand Yang Chengwu | 2001 | IEEE Transactons on Automatic Control2001，46，8： | 1 |
| 11 | H state feedback control for discrete singular systems 显示文摘 | XU Shengyuan YANG Chengwu | 2000 | IEEETransactions on Automatic Control2000，7，45： | 1 |
| 12 | Stabilization of discrete-time singular systems: a matrix inequalities approach显示文摘 | Xu Shengyuano Yang Chengwu | 1999 | Automatica1999，35，9： | 1 |
| 13 | An Algebraic Approach to the Robust Stability Analysis and Robust Stabilization of Uncertain Singular Systems显示文摘 | Xu Shengyuan Yang Chengwu | 2000 | Int J Systems Science2000，30，1： | 1 |
| 14 | Quadratic stability and stabilization of uncertain linear discrete-time systems with state delay显示文摘 | Shengyuan Xu James Lam Chengwu Yang | 2001 | Systems and Control Letters2001，43，2： | 1 |
| 15 | Stabilization of discrete-time singular systems:A amtrix inequalities approach显示文摘 | Xu Shengyuan Yang Chengwu | 1999 | Automatica1999，35，： | 1 |
| 16 | Delay-dependent robust passivity control for uncertain time-delay systems显示文摘The robust passivity control problem is addressed for a class of uncertain delayed systems with time-varying delay. The parameter uncertainties are norm-bounded. First, the delay-dependent stability sufficient condition is obtained for the nominal system, and then, based-on the former, the delay-dependent robust passivity criteria is provided and the corresponding controller is designed in terms of linear matrix inequalities. Finally, a numerical example is given to demonstrate the validity of the proposed approach. | Li Guifang Li Huiying Yang Chengwu | 2007 | Journal of Systems Engineering and Electronics2007，18，4： | 1 |
| 17 | H ∞ and positive-real control for linear neutral delay systems显示文摘 | XU Shengyuan JAMES Lam YANG Chengwu | 2001 | IEEE Trans Automat Control2001，46，8： | 1 |
| 18 | Stabilization of discretetime singular systems: a matrix inequality approach显示文摘 | Xu Shengyuan Yang Chengwu | 1999 | Automatica1999，35，9： | 1 |
| 19 | An algebraic approach to the robust stability analysis and robust stabilization of uncertain singular systems 显示文摘 | XU Shengyuan YANG Chengwu | 2000 | Int J Science2000，30，1： | 1 |
| 20 | Robust H∞control for uncertain discrete singular systems with pole placement in a disk显示文摘 | Xu Shengyuan James Lam Yang Chengwu | 2001 | System & Control Letters2001，43，： | 1 |
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