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Search Results: 1 - 10 of 57368 matches for " LU Xi-yun "
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Statistical Analysis of Coherent Vortical Structures in a Supersonic Turbulent Boundary Layer

WANG Li,LU Xi-Yun,

中国物理快报 , 2011,
Abstract:
The Effect of Mach Number on Turbulence Behaviors in Compressible Boundary Layers

WANG Li,LU Xi-Yun,

中国物理快报 , 2011,
Abstract:
Curvature Effect on Compressible Turbulent Flow over a Wavy Wall
SUN Xiao-Bo,LU Xi-Yun,
孙小波
,陆夕云

中国物理快报 , 2007,
Abstract: A fully developed compressible turbulent flow in a channel with a lower wavy wall and a upper plane wall is studied using large eddy simulation. We mainly attempt to deal with the curvature effect on compressible turbulent flow over the wavy wall. Some typical quantities including the mean turbulence statistics, dilatation and baroclinic terms in the enstrophy equation, turbulent kinetic energy budgets and the near-wall turbulent structures are analysed. The results obtained in this study provide physical insight into the understanding of the effects of curvature and compressibility on wall-bounded compressible turbulent flow.
Flutter of Finite-Span Flexible Plates in Uniform Flow

BAO Chun-Yu,TANG Chao,YIN Xie-Zhen,LU Xi-Yun,

中国物理快报 , 2010,
Abstract: The flutter instability and response of finite-span flexible plates in uniform flow are investigated experimentally. The effects of the plate aspect ratio on its dynamic responses are mainly analyzed. A hysteretic phenomenon is observed and can be described such that the plate flutters spontaneously as the flow velocity is greater than a critical value U*C and the plate returns to its stable state as the flow velocity is slowly decreased to another critical one U*D. We find that the aspect ratio has a greater effect on U*C than on U*D. The flutter frequency decreases and the amplitude increases with the increase in the flow velocity. When the flutter instability of the plate occurs, three typical flutter modes are identified and are associated with the aspect ratio and the flow velocity.
Turbulent Boundary Layer Control via a Streamwise Travelling Wave Induced by an External Force

QIN Tong,GAO Peng,LIU Nan-Sheng,LU Xi-Yun,

中国物理快报 , 2008,
Abstract: Turbulent boundary layer control via a streamwise travelling wave is investigated based on direct numerical simulation of an incompressible turbulent channel flow. The streamwise travelling wave is induced on one side wall of the channel by a spanwise external force, e.g., Lorenz force, which is confined in the viscous sublayer. As the control strategy used in this study has never been examined, we pay our attention to its efficiency of drag control. It is revealed that the propagating direction of the travelling wave, i.e., the downstream or upstream propagating direction with respect to the streamwise flow, has an important role on the drag control, leading to a significant drag reduction or enhancement for the parameters considered. The coherent structures of turbulent boundary layer are altered and the underlying mechanisms are analysed. The results obtained provide physical insight into the understanding of turbulent boundary layer control.
The Kinematic Analysis of C-start in Crucian Carp (Carassius Auratus)
鲫鱼C形起动的运动学特征分析

JING Jun,LI Sheng,LU Xi-yun,YIN Xie-zhen,
敬军
,李晟,陆夕云,尹协振

实验力学 , 2004,
Abstract: Fast-starts are an important maneuver capability for most fish to escape from predators and for some fish to capture prey. The fast-starts can be divided into two main types, C-start and S-start. In this paper, the distance-time performance in escape response of startled Crucian carp (Carassius auratus) was investigated by employing high-speed digital video (1000Hz). All escape response observed are C-type fast-starts, in which the fish assumes a C shape at the end of the initial body contraction (stage 1). Examination of filmed sequences of turning fish shows that the C-type fast-start process includes three stages, distinguished by different movements of the centre of mass and motions of the caudal fin. In the first stage the centre of mass keeps the position, and the fish body turns a C shape, which leads the tail moves quickly. Next, the fish tail starts moving with large amplitude in the counter direction and the fish head turns into the final direction. At the last, the centre of mass moves in straight line of swimming. The curved figures of backbone of fish in all stages are given by using the special software. Distribution of the velocity along the backbone of fish and angle velocity of fish body around the center of mass are also obtained. Then, the whole escape response process is qualitatively analyzed from the point of view of hydrodynamics.
Current research in perineural invasion of cholangiocarcinoma
Fang-Zhen Shen, Bing-Yuan Zhang, Yu-Jie Feng, Zhuo-Xia Jia, Bing An, Chang-Chang Liu, Xi-Yun Deng, Anil D Kulkarni, Yun Lu
Journal of Experimental & Clinical Cancer Research , 2010, DOI: 10.1186/1756-9966-29-24
Abstract: Studies were identified by searching MEDLINE and PubMed databases for articles from January 1990 to December 2009, using the keywords "cholangiocarcinoma," "perineural invasion," "nerve growth factor"(NGF), "neural cell adhesion molecule" (NCAM), "matrix metalloproteinase"(MMP), "neurotransmitter," "acetylcholine" (Ach), and "transforming growth factor" (TGF)." Additional papers and book chapters were identified by a manual search of references from the key articles.From above we found that the molecules NGF, NCAM, MMP, Ach and TGF may have prognostic significance in, and offer clues to the mechanism of CCA neural invasion.Cholangiocarcinoma's increasing worldwide incidence is especially poignant in view of both the lacking effective therapies, and the fact that it is commonly diagnosed in advanced stages. As CCA neural invasion often appears early, more complete characterization of its molecular pathology could lead to the identification of targets for the diagnosis and therapy of this devastating malignancy.Cholangiocarcinoma (CCA) is a malignant tumor originating from biliary tract epithelial cells. Among primary liver tumors, CCA incidence is only less than that of liver cancer[1,2], and it is becoming the most common hepatic tumor-induced death[3].Due to its difficulty of diagnosis and high fatality rate, cholangiocarcinoma is extremely destructive, currently surgery is the only therapeutic mode offering a cure. Moreover, the post-resection recurrence rate is extremely high and the five-year survival rate is only 5%, at the same time, this survival rate had not vastly improved in past three decades[4]. In recent years, its worldwide morbidity and mortality have increased rapidly. Invasion delitescence, insufficient markers for early diagnosis marker, insensitivity to regular radio- and chemotherapy--these are all causes of poor prognoses of CCA patients[5,6].Cholangiocarcinoma via perineural invasion is an extremely part during its genesis and development espec
A Mixed Algorithm for Nonlinear Complementarity Problems
Xi-yun Wang,Ya Wang,Yu-yang Wang
Journal of Computers , 2011, DOI: 10.4304/jcp.6.8.1562-1569
Abstract: Combining nonmonotone trust region algorithms and PSO methods, we propose a mixed method for nonlinear complementarity problems. The iterative formula of μk is very simple. When the determinant of Bk +λkI is very large or small, the PSO method will obtain a new point which gets us better astringency. Numerical test results show the effectiveness of this algorithm.
Progression and Direction of Humanized Antibody Research
人源化抗体研究历程及发展趋势

LIN Yun{,} YAN Xi-Yun,
林芸
,阎锡蕴

生物工程学报 , 2004,
Abstract: After its advent, monoclonal antibody has gone an uneven way to its present wide applications in clinical practices, during which the humanized antibody set an important milestone accompanying a series of technique renovations, such as PCR technique, phage display and transgenic animals. Humanized antibody has developed from chimeric antibody and reshaped antibody to the present fully human antibody. Humanization of murine antibodies has been the future direction of therapeutic antibodies and this can be reflected from the fact that humanized antibodies or even human antibodies have made up majority of the therapeutic antibodies both in clinical test and in the market. The present techniques have enabled the production of fully human antibodies and given chances to the arising of antibody derivatives. They not only overcome the deficiency in application of murine antibody with different strategies, but also provide more weapons for human therapeutics. However, modifications of monoclonal antibody aiming at clinical applications need more research work in the mechanisms of antibody effector system, as well as comprehensive understanding in regulation of human immune system.
3-(1,3-Dithiolan-2-ylidene)-1-phenylpyridine-2,4(1H,3H)-dione
Lei-Jiao Li,Yan Li,Xi-Yun Hao,Xiu-Yun Sun
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809021862
Abstract: The title compound, C14H11NO2S2, was synthesized by reaction of 2-(1,3-dithiolan-2-ylidene)-3-oxo-N-phenylbutanamide with N,N′-dimethylformamide dimethyl acetal in N,N′-dimethylformamide. The molecule exhibits a V-shaped conformation in the crystal, with a dihedral angle of 65.9 (2)° between the benzene and pyridine rings. In the crystal. C—H...O and C—H...S interactions are observed. Two C atoms of the dithiolane ring are disordered with occupancies in the ratio 0.541 (13)/0.459 (13).
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