OALib Journal期刊

ISSN: 2333-9721




2017 ( 10 )

2016 ( 24 )

2015 ( 213 )

2014 ( 437 )


匹配条件: “Qingsong MEI” ,找到相关结果约11764条。
Density Measurement of Liquid Metals Using Dilatometer
Lianwen WANG,Qingsong MEI,
Lianwen WANG and Qingsong MEI Shenyang National Laboratory for Materials Science
,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,China

材料科学技术学报 , 2006,
Abstract: The dilatometer method for density measurement of liquid metals was improved to give a high measurement accuracy with simple operation. The density of liquid tin was measured and the results are in agreement with values in literature. The melting point density of liquid Sn was measured to be 6.966×103 Kg·m-3 and the temperature (T) dependence of the density (ρ) for liquid Sn can be well described by a polynomial equation ρ(T)=7.406 - 9.94 × 10-4T 2.12 × 10-7T2.
Effect of Leaky Rate on the Stability of Autonomously Echo State Network
Qingsong Song
Information Technology Journal , 2012,
Abstract: Echo State Neural Network (ESN) has becoming much attractive in Artificial Neural Network (ANN) community since it can be easily constructed and adapted. Its superiority over traditional ANN has been demonstrated in many applications. The Wiener-Hopf solution is usually exploited to account for the adaptations. However, the solution can hardly ensure the Lyapunov stability of the trained Leaky-integrator ESNs (LiESNs), when they run in a closed-loop autonomously generative mode. LiESN is another type of ESN, which consists of leaky-integrator neurons. In this study, a sufficient condition of the Lyapunov stability for the autonomously running LiESNs is proposed and proved at first. And then, the output connection weight learning problem is translated into an optimization problem with a nonlinear restriction. Particle swarm optimization algorithm is explored to solve the optimization problem. The simulation experiment results show that the output weight adaptation algorithm, we proposed (we call it PSOESN) can effectively ensure the output precision as well as the Lyapunov stability of the trained LiESNs. It is concluded that the PSOESN is a more effective solution to the output connection weight adaptation problem of such autonomously running ESNs.
Kinematic Analysis and Optimization of a New Compliant Parallel Micromanipulator
Qingsong Xu,Yangmin Li
International Journal of Advanced Robotic Systems , 2008,
Abstract: In this paper, a new three translational degrees of freedom (DOF) compliant parallel micromanipulator (CPM) is proposed, which has an excellent accuracy of parallel mechanisms with flexure hinges. The system is established by a proper selection of hardware and analyzed via the derived pseudo-rigid-body model. In view of the physical constraints imposed by both the piezoelectric actuators and flexure hinges, the CPM's reachable workspace is determined analytically, where a maximum cylinder defined as an usable workspace can be inscribed. Moreover, the optimal design of the CPM with the consideration of the usable workspace size and global dexterity index simultaneously is carried out by utilizing the approaches of direct search method, genetic algorithm (GA), and particle swarm optimization (PSO), respectively. The simulation results show that the PSO is the best method for the optimization, and the results are valuable in the design of a new micromanipulator.
A New Construction of Job-Shop Scheduling System Integrating ILOG and MAS
Lizhi Qin,Qingsong Li
Journal of Software , 2012, DOI: 10.4304/jsw.7.2.269-276
Abstract: While manufacturing industry facing tough market competition, quickly responsive and flexible Job-Shop Scheduling System, JSSS, seems more attractive in nowadays. Research and applications on JSSS were summarized in this paper. A new framework of JSSS was designed in our research. A synthetic method was used here in order for efficiency and practicality. We took advantage of Multi-Agent System (MAS) and ILOG, which is a powerful calculation platform in the field of optimization. Interactive models between MAS and ILOG, among agents in MAS were also devised. Prototype of this JSSS represents more convenient and flexible scheduling plan in test by engineer of an automobile factory.
Finite volume schemes of any order on rectangular meshes
Zhimin Zhang,Qingsong Zou
Mathematics , 2012,
Abstract: In this paper, we analyze vertex-centered finite volume method (FVM) of any order for elliptic equations on rectangular meshes. The novelty is a unified proof of the inf-sup condition, based on which, we show that the FVM approximation converges to the exact solution with the optimal rate in the energy norm. Furthermore, we discuss superconvergence property of the FVM solution. With the help of this superconvergence result, we find that the FVM solution also converges to the exact solution with the optimal rate in the $L^2$-norm. Finally, we validate our theory with several numerical experiments.
Design of Distributed Temperature Measurement System for Switchgear  [PDF]
Qingsong Yang, Jianfei Yang, Huaren Wu, Long Liu
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B184

This paper develops a novel distributed temperature measurement system based on DSP and DS18B20 digital thermometer. The real-time temperature of each node in the switchgear is obtained by several DS18B20s which are connected on the 1-wire bus together. RS-485 master-slave communication protocol is used to centralize monitoring temperatures of several switchgear cabinets. The system also has the function of temperature alarm. The operation of simulation experiment has showed that the system is able to complete monitoring real-time temperatures in high voltage switchgear.

Regulation of exogenous brassinosteroid on growth and photosynthesis of Helianthus tuberosus seedlings and cadmium biological enrichment under cadmium stress

GAO Huiling,LIU Jinlong,ZHENG Qingsong,HONG Lizhou,WANG Changhai,MA Mei,ZHAO Shixun,ZHENG Chunfang,

生态学报 , 2013,
Abstract: 本试验以2种菊芋(Helianthus tuberosus L.)品系南芋2号(NY2)和南芋5号(NY5)为试验材料,研究了外源24-表油菜素内酯(24-EBL)对镉胁迫下菊芋幼苗干重、根冠比(R/S)、光合色素含量、叶片气体交换参数和水分利用效率(WUE)的调节效应,还测定了不同器官的镉(Cd)含量。结果表明:(1)在镉胁迫下,2种菊芋幼苗的干重、R/S、光合色素含量、净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、WUE均呈下降趋势,而胞间二氧化碳浓度(Ci)升高;而与镉胁迫相比,胁迫下外源喷施10-10、10-9、10-8、10-7 mol/L 24-EBL作用下,两品系植株干重和R/S值均不同程度的上升,NY2、NY5的植株干重分别在10-9 mol/L 24-EBL(EBL2)和10-8 mol/L 24-EBL(EBL3)处理下达到最大值,分别比镉处理下增加50%和64%。(2)与对照相比,镉胁迫下,菊芋NY2与NY5叶片中的叶绿素(Chl)含量和类胡萝卜素(Car)含量显著下降,而外源24-EBL均提高其含量。(3)镉胁迫下,两菊芋品系幼苗叶片的净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Tr)均明显下降,NY2的这三个指标的降幅显著大于NY5的;而外喷EBL2和EBL3条件下,Pn、Gs、Tr均得到不同程度的上升。Cd胁迫下,两菊芋品系幼苗的胞间二氧化碳浓度(Ci)均显著上升,外源EBL2、EBL3处理下,其Ci均下降,而NY5的Ci下降更显著。(4)镉胁迫下,两菊芋的叶片WUE显著下降,而外源EBL2和EBL3作用下均不同程度地提高其WUE,NY5的WUE增幅远大于NY2。(5)镉胁迫下,NY5的新完全展开叶Cd含量的积累明显高于NY2;而24-EBL处理下可降低NY2的新完全展开叶Cd含量,但却增加NY5的叶片Cd含量。(6)镉胁迫下,喷施24-EBL的NY2的不同器官、NY5的根和叶柄的Cd含量均显著下降,而NY5茎和叶的Cd含量变化不显著。NY5不同器官的Cd含量均明显高于NY2。上述表明,24-EBL可明显提高菊芋的耐镉水平,主要是因为外源喷施24-EBL能显著促进其光合和提高水分利用效率,从而改善Cd胁迫下菊芋幼苗的生长;而24-EBL对菊芋NY5非气孔限制的更显著改善是其促进其光合、水分利用的重要原因,也是其对NY5的生长
A Guess Model of Black Holes and the Evolution of Universe  [PDF]
Zhenhua Mei, Shuyu Mei
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.329154
Abstract: Based on the gravitational theory, fundamental data, and comprehensible suppositions, an evolution model of the universe was proposed. The universe exists in explosion and constringency mobile equilibrium state. The critical sizes of celestial bodies were calculated in their evolution process.
A new dynamics model for traffic flow
Rui Jiang,Qingsong Wu,Zuojin Zhu
Chinese Science Bulletin , 2001, DOI: 10.1007/BF03187201
Abstract: As a study method of traffic flow, dynamics models were developed and applied in the last few decades. However, there exist some flaws in most existing models. In this note, a new dynamics model is proposed by using carfollowing theory and the usual connection method of micro-macro variables, which can overcome some ubiquitous problems in the existing models. Numerical results show that the new model can very well simulate traffic flow conditions, such as congestion, evacuation of congestion, stop-and-go phenomena and phantom jam.
Link between the geomagnetic polarity reversal and global-geology events
Rixiang Zhu,Qingsong Liu,Yongxin Pan
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02886338
Abstract: The origin of the earth’s magnetic field is one of the five most important unsolved problems in physics, especially geomagnetic polarity reversal remains one of Nature’s most enigmatic phenomena. It is proposed that the geomagnetic polarity reversal links with some global-geology events, although it is difficult to clarify the mechanism of this correlation. The history of continental structures in eastern China would be also linked with some global-geology events.

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