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Search Results: 1 - 10 of 78350 matches for " Jianbing Chen "
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Experimental Study on Vibration Control of Offshore Wind Turbines Using a Ball Vibration Absorber  [PDF]
Jie Li, Zili Zhang, Jianbing Chen
Energy and Power Engineering (EPE) , 2012, DOI: 10.4236/epe.2012.43021
Abstract: To minimize the excessive vibration and prolong the fatigue life of the offshore wind turbine systems, it is of value to control the vibration that is induced within the structure by implementing certain kinds of dampers. In this paper, a ball vibration absorber (BVA) is experimentally investigated through a series of shake table tests on a 1/13 scaled wind turbine model. The reductions in top displacement, top acceleration, bottom stress and platform stress of the wind turbine tower system subjected to earthquakes and equivalent wind-wave loads, respectively, with a ball absorber are examined. Cases of the tower with rotating blades are also investigated to validate the efficacy of this damper in mitigating the vibration of an operating wind turbine. The experimental results indicate that the dynamic performance of the tested wind turbine model with a ball absorber is significantly improved compared with that of the uncontrolled structure in terms of the peak response reduction.
Resistant Mechanism and Treatment Strategy of Tyrosine Kinase Inhibitors
Jianbing QIAO,Wenping CHEN
Chinese Journal of Lung Cancer , 2011, DOI: 10.3779/j.issn.1009-3419.2011.10.07
Generalization of the Pecaric-Rajic Inequality in a Quasi-Banach Space  [PDF]
Jianbing Cao
Advances in Pure Mathematics (APM) , 2017, DOI: 10.4236/apm.2017.79031
Abstract: In the present paper, we shall give an extension of the well known Pecaric-Rajic inequality in a quasi-Banach space, we establish the generalized inequality for an arbitrary number of finitely many nonzero elements of a quasi-Banach space, and obtain the corresponding upper and lower bounds. As a result, we get some more general inequalities.
The SMW Formula for Bounded Homogeneous Generalized Inverses with Applications  [PDF]
Jianbing Cao
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.59143
Abstract: In this paper, we present an extension of the so-called classical Sherman-Morrison-Woodbury (for short SMW) formula for bounded homogeneous generalized inverse in Banach spaces. Some particular cases and applications will be also considered. Our results generalize the results of many authors for finite dimensional matrices and Hilbert space operators in the literature.
Study on the technology for highway construction and engineering practices in permafrost regions

ShuangJie Wang,JianBing Chen,JiLin Qi,

寒旱区科学 , 2009,
Abstract: In order to systemically summarize and integrate technology of highway construction in permafrost regions on the Qinghai-Tibet Plateau, we studied disciplines and mechanisms of formation and development of problems and challenges in highway engineering in high-altitude permafrost regions based on construction experiences for 50 years and on 30 years of research regarding the Qinghai-Tibet and Xikang highways. Embankments, pavements, bridges, and countermeasures for ecosystem protection in permafrost regions were the main study objects. We combined extensive analysis of key problems of engineering stability with interaction between permafrost and highways, theoretical models, indoor tests, and field tests to reveal the interaction between embankments, pavements, bridge piles, and permafrost. In this paper, we propose a series of engineering measures for highway stability, design parameters, key indexes for pavement durability in low temperature, relationships between re-freezing time of bridge-pile foundation and strength development as well as ecosystem recovery in high-latitude cold regions; these eventually form a construction technology package for permafrost regions.
mRNA Differential Display of Tea Leavse under Polyethylene Glycol Stress
Guinian Qi,Jianbing Xia,Shengxiang Chen,Yingjuan Chen
Journal of Agricultural Science , 2010, DOI: 10.5539/jas.v2n4p186
Abstract: Tea (Camellia sinensis L.) is one of the world's three largest beverages which play an important role in agricultural production of China, India, Sri Lanka and other countries. Gene expression of two years old Fuding-dabaicha was analyzed using DDRT-PCR under PEG6000 stress. Through the analysis and screening of experimental conditions and primers combination, a number of different fragments were obtained. By submitting to GeneBank and BLAST comparison, we identified three different fragments while only one has pigment-related gene fragment.
Strategy of selecting points via number theoretical method in probability density evolution analysis of stochastic response of structures

Chen Jianbing,Li Jie,

力学学报 , 2006,
Abstract: The newly developed probability density evolution method (PDEM) is capable of capturing instantaneous probability density function and its evolution of linear and/or nonlinear stochastic response of structures. In the occasions that multiple random parameters are involved in the structural properties and external excitations, the strategy of selecting representative points required in the PDEM is of paramount importance to the accuracy and efficiency. Enlightened by the Number Theoretical Method successfully employed in high-dimensional numerical integration, the strategy of selecting points via Number Theoretical Method is proposed in the present paper. Further, making use of the spherically symmetric properties or the radial attenuation properties of the joint probability density function, the points scattered over the multi-dimensional hypercube selected by the Number Theoretic Method are sieved once again such that only the points inside the multi-dimensional hyper-ball are retained. With the proposed strategy of selecting points, the stochastic response analysis involving multiple random parameters is almost as efficient as the problem involving only one single random parameter.
The probability density evolution method for dynamic reliability assessment of nonlinear stochastic structures

Chen Jianbing Li Jie,

力学学报 , 2004,
Abstract: An original approach for dynamic reliability assessment of nonlinear stochastic structures is proposed.In the past few years,a new method,named the probability density evolution method,has been developed,showing versatile capability in engineering stochastic mechanics such as the stochastic response analysis of either linear or nonlinear structures in either static or dynamic occasions.In the method,the probability density evolution equation,a first order quasi-linear partial differential equation in terms of the joint probability density,is deduced and uncoupled to a one-dimensional partial differential equation,which is easy to be numerically solved combining the deterministic dynamic response analysis of structures,such as the precise integration method or Newmark-Beta time integration method,and the finite difference method.Therefore,the instantaneous probability density function,rather than the second order statistical characteristics such as the mean,the covariance function and the power spectrum density and so on which are focused on by traditional stochastic finite element methods,of the response quantities of interest can be obtained.In the present paper,the probability density evolution method is applied to assess the dynamic reliability of stochastic structures.To achieve the purpose,an absorbing boundary condition corresponding to the failure criterion of the first passage problem is imposed on the probability density evolution equation.Solving the initial-boundary-value partial differential equation problem with a numerical algorithm will give the "remaining" probability density function of the response.The dynamic reliability can then be assessed through integrating the "remaining" probability density function over the safe domain.The numerical algorithm is studied in detail where an adaptive TVD difference scheme is presented.In contrast to the widely used level-crossing process based reliability assessment approach,in the proposed method the mean out-crossing rate,which is usually obtained through the Rice formula,is not needed,nor the properties of the level-crossing process such as the Poisson and Markovian assumption.Therefore the proposed method is expected to have a high accuracy.An 8-story frame structure with bilinear hysteretic restoring force,which is subjected to seismic excitation,is investigated.The results of dynamic reliability assessment are compared with those evaluated by the Monte Carlo simulation.The investigation shows that the proposed approach is of high accuracy and efficiency.
The joint probability density function of nonlinear dynamic stochastic response of structures

Li Jie,Chen Jianbing,
李 杰

力学学报 , 2006,
Abstract: In nonlinear dynamic response analysis and reliability evaluation of structures, it is of paramount importance to capture the joint probability density function for various response quantities. In the present paper, following the basic line of density evolution, the generalized density evolution equation is extended to a two-dimensional partial differential equation governing the joint probability density function. The numerical algorithm combines the deterministic dynamic response analysis and the finite difference method. Numerical example is given for a ten-story frame structure with stochastic parameters subjected to random ground motions. The investigations show that the joint probability density function is irregular like a hilly country, while the coefficient of covariance varies with time.
Study of Heart Sound Analysis Instrument
Xiefeng Cheng, zhang Saobai, cheng jianbing, Chen Hong
Frontiers in Manufacturing Engineering , DOI: 10.7508/FME-V1-N1-1-6
Abstract: A heart sound analysis instrument based on the LabVIEW is devised. There are five subsystems in this instrument: heart sound receiving subsystem, wavelet de-noise subsystem, time domain analysis subsystem, frequency domain analysis subsystem and heart sound signal generation subsystem. The instrument is developed in PC, by using homemade wireless heart sounds receiving device and heart sounds signal receiving subsystem to get heart sound signals, and then using wavelet de-noising subsystem to remove the background noise, finally, the instrument uses time-domain analysis subsystem and frequency domain analysis sub-system to analyze the heart sounds signals. Heart sound signal generator subsystems can produce synthetic heart sound signals accord to the need of users to learn and use. The operating environment of this instrument proves it can collect vivid heart sound signal, reduce noise effectively, computer the characteristic values quickly and accurately, generate and play heart sound precisely. It can be used as an assistance to show, play, and analyze heart sound.
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