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Search Results: 1 - 10 of 23924 matches for " Dan Qi "
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A Fuzzy Logic Behavior Architecture Controller for a Mobile Robot Path Planning in Multi-obstacles Environment
KarimBenbouabdallah,Zhu Qi-dan
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: The path planning and obstacle avoidance are the most important tasks for an autonomous mobile robot moving in an unknown environment. This paper presents a simple fuzzy logic controller which involves searching target and path planning with obstacle avoidance. In this contest, fuzzy logic controllers are constructed for target searching behavior and obstacle avoidance behavior based on the distance and angle between the robot and the target as inputs for the first behavior and the distance between the robot and the nearest obstacle for the second behavior; then a third fusion behavior is developed to combine the outputs of the two behaviors to compute the speed of the mobile robot in order to fulfill its task properly. Simulation results show that the proposed approach is efficient and can be applied to the mobile robots moving in unknown environments.
Improved Genetic Algorithm Lyapunov-Based Controller for Mobile Robot Tracking a Moving Target
Karim Benbouabdallah,Zhu Qi-Dan
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: Target tracking is taken account as one of the most important topics in mobile robotics. This study addresses the problem of controlling of non-holonomic mobile robot to track a moving target. The control technique relies on Lyapunov stability to design a robust nonlinear control law to fulfill the target tracking. The proposed controller computes both the robot linear and angular velocities to regulate the position and orientation of the robot according to the moving target position. In addition, a genetic algorithm was applied to improve the controller’s performance by tuning its coefficients. Finally, simulations results are provided to verify the applicability and effectiveness of the proposed control approach.
Genetic Fuzzy Logic Control Technique for a Mobile Robot Tracking a Moving Target
Karim Benbouabdallah,Zhu Qi-Dan
International Journal of Computer Science Issues , 2013,
Abstract: Target tracking is a crucial function for an autonomous mobile robot navigating in unknown environments. This paper presents a mobile robot target tracking approach based on artificial intelligence techniques. The proposed controller calculates both the mobile robot linear and angular velocities from the distance and angle that separate it to the moving target. The controller was designed using fuzzy logics theory and then, a genetic algorithm was applied to optimize the scaling factors of the fuzzy logic controller for better accuracy and smoothness of the robot trajectory. Simulation results illustrate that the proposed controller leads to good performances in terms of computational time and tracking errors convergence.
Study on the Interaction between Cadmium Sulphide Nanoparticles and Proteins by Resonance Rayleigh Scattering Spectra
Weiwei Zhu,Qi Wang,Dan Su
Journal of Chemistry , 2013, DOI: 10.1155/2013/583148
Abstract: The interaction of cadmium sulphide nanoparticles with proteins has been studied by resonance Rayleigh scattering spectra (RRS). Below the isoelectric point, proteins such as bovine serum albumin (BSA), human serum albumin (HSA), lysozyme (Lys), hemoglobin (HGB), and ovalbumin (OVA) can bind with to form macromolecules by virtue of electrostatic attraction and hydrophobic force. It can result in the enhancement of resonance Rayleigh scattering spectra (RRS) intensity. Their maximum scattering peaks were 280?nm, and there was a smaller peak at 370?nm. The scattering enhancement ( ) is directly proportional to the concentration of proteins. A new RRS method for the determination of trace proteins using uncapped nanoparticles probe has been developed. The detection limits are 19.6?ng/mL for HSA, 16.7?ng/mL for BSA, 18.5?ng/mL for OVA, 80.2?ng/mL for HGB, and 67.4?ng/mL for Lys, separately. In this work, the optimum condition of reaction, the effect of foreign, and the analytical application had been investigated. 1. Introduction In recent years, nanoparticles (NPs) are gaining an intensive interest in many academic and industrial fields, especially their use in detection of proteins and DNA [1, 2]. This is not only due to the unique optical properties of these NPs, such as size-dependent tunable emission wavelength and exceptional photochemical stability but also due to their dimensional similarities with biological molecules [3]. Recently, The interaction of cadmium sulphide nanoparticles [ ] with protein has been studied using various methods, such as UV-Vis spectroscopy [4], fluorescence spectroscopy [5], Raman spectroscopy [6], dynamic light scattering [6], scanning electron microscopy, and X-ray diffraction [7]. However, Asja Jhonsi et al. discovered that the interaction between uncapped CdS and BSA was very weak [3]. So, a lot of studies have focused on capped CdS nanoparticles by using various capping agents, such as thioglycerol [8], L-cysteine [9], acrylic acid [10], and starch [11]. And the results show that the most sensitive quantitation of protein is generally based on their fluorescence enhancement effect on organic dyes. However, the organic fluorophores often suffer from photobleaching, low signal intensities, and random on/off light emission [12, 13]. So, further studies of interaction between uncapped CdS nanoparticles and protein are significant for some new methods. We have found that the chemically unmodified gold nanoparticles can be used as some spectral probes by the method of resonance Rayleigh scattering intensity (RRS) [14]. The
Mechanical Behavior and Failure Criterion of High Performance Concrete Under Biaxial Tension-Compression Loading Condition
Mechanical Behavior and Failure Criterion of High Performance Concrete Under Biaxial Tension-Compression Loading Condition

Jinlong Pan,Dan Wu,Changyu Qi
- , 2018, DOI: 10.15918/j.jbit1004-0579.17095
Abstract: The mechanical behavior and failure criterion of high performance concrete (HPC) subjected to biaxial tension-compression loading conditions were investigated experimentally with a real triaxial testing system. The failure modes, ultimate strength and stress-strain curves of HPC under biaxial tension-compression loading conditions were obtained. Then, mechanical behavior of HPC under different stress ratios were analyzed. Finally, based on the Kupfer's strength criterion for conventional concrete and test results, a novel failure criterion was proposed for HPC under biaxial tension-compression loading conditions.
The mechanical behavior and failure criterion of high performance concrete (HPC) subjected to biaxial tension-compression loading conditions were investigated experimentally with a real triaxial testing system. The failure modes, ultimate strength and stress-strain curves of HPC under biaxial tension-compression loading conditions were obtained. Then, mechanical behavior of HPC under different stress ratios were analyzed. Finally, based on the Kupfer's strength criterion for conventional concrete and test results, a novel failure criterion was proposed for HPC under biaxial tension-compression loading conditions.
Influence of post-annealing on the properties of Ta-doped In2O3 transparent conductive films
Lei Xu,Rui Wang,Yong Liu,Dan Zhang,Qi Xiao
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4450-y
Abstract: Ta-doped In2O3 transparent conductive oxide films were deposited on glass substrates using radio-frequency (RF) sputtering at 300°C. The influence of post-annealing on the structural, morphologic, electrical and optical properties of the films was investigated using X-ray diffraction, field emission scanning electron microscopy, Hall measurements and optical transmission spectroscopy. The obtained films were polycrystalline with a cubic structure and were preferentially oriented in the (222) crystallographic direction. The lowest resistivity, 5.1×10 4 Ω cm, was obtained in the film annealed at 500°C, which is half of that of the un-annealed film (9.9×10 4 Ω cm). The average optical transmittance of the films was over 90%. The optical bandgap was found to decrease with increasing annealing temperature.
[Na(THF)2(μ2- η5- Cp)(η5, η5, η1-Cp3Yb)(THF)]n: The synthesis and X-ray structure of an anionic organolanthanide polymer formed via self-assembly
Huang Dan,Sun Hongmei,Liu Taiqi,Xu Fan,Shen Qi
Chinese Science Bulletin , 2005, DOI: 10.1360/982004-544
Abstract: Cp2Yb·2THF reacts with CpNa in 1:1 molar ratio in THF at 40°C for 2 h, and the in situ generated anionic divalent complex NaYbCp3(THF)n reacts further with an excess of CpH at 40°C for 48 h, after work-up, affording the trivalent anionic ytterbium complex [Na(THF)2(μ2-η5-Cp) (η5,η5,η1-Cp3Yb)(THF)]n (1) by oxidation reaction of Cp2Yb with CpH. Crystal structure determination reveals that complex 1 has one-dimension polymeric chains of distinct Na(THF)2(μ 2-η5 -Cp)(η5, η5, η1-Cp3Yb)(THF) units, which were formed by the coordination of the bridging Cp ligand with Cp3Yb·THF and Na(THF)2 in η5,η5 mode via self-assembly.
Mobility of bacterial group Ⅱ introns-A review
细菌Ⅱ组内含子(GroupⅡintron)的转移机制

Dan Qi,Qing Meng,
齐丹
,孟清

微生物学报 , 2009,
Abstract: 摘要: 约14年前在真核生物中发现的Ⅱ组内含子不仅具有催化功能,而且是可移动的逆转录元件。近年来研究发现细菌中也有可移动的Ⅱ组内含子,它们能够逆转录归巢进入同源无内含子的等位基因位点或者逆转录转座进入非等位基因位点。本文试图从细菌Ⅱ组内含子编码蛋白的活性功能域的组成与Ⅱ组内含子转移发生途径之间的联系,综述已知细菌Ⅱ组内含子主要的移动机制。同时,依据作者多年来研究海洋蓝细菌Ⅱ组内含子编码蛋白对Ⅱ组内含子剪接机理的结果,探讨了海洋蓝细菌Ⅱ组内含子是否会发生转移以及可能的转移方式,探讨了Ⅱ组内含子在生物基因组中发生转移的生物学意义。
Glass/Ta2O5 Composite Waveguides for Application as an Integrated Polarimetric Interferometer

LU Dan-Feng,QI Zhi-Mei,

中国物理快报 , 2010,
Abstract:
Syringic Acid Extracted from Herba dendrobii Prevents Diabetic Cataract Pathogenesis by Inhibiting Aldose Reductase Activity
Xiaoyong Wei,Dan Chen,Yanchun Yi,Hui Qi
Evidence-Based Complementary and Alternative Medicine , 2012, DOI: 10.1155/2012/426537
Abstract:
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