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Frontiers of Environmental Science & Engineering 2017年第2期11卷 165-174页

作者： Qingbin guo sheng Chang School of Engineering University of Guelph Guelph Ontario N 1G 2W1 Canada

Characterization of the molecular properties of soluble microbial products （SMP） is critical for understanding the membrane filtration and fouling mechanisms in anaerobic and aerobic membrane bioreactors （AnMBR ＆ MBR）. In this study, the distributions of the absolute molecular weight and intrinsic viscosity of SMP polysaccharides from an AnMBR were effectively determined by a high pertbrmance size exclusion chromatography （HPSEC） that was coupled with the refractive index （RI）,cliode array UV （DAUV）, right and low angle light scattering （LS）, and viscometer （Vis） detectors. Based on the tetra-detector HPSEC determined absolute molecular weights and intrinsic viscosity, a universal calibration relationship for the SMP polysaccharides was developed and the molecularconformations, average molecular weights~ and hydrodynamic sizes of the SMP polysaccharides were also explored. Two factors which can be derived from the tetra-detector HPSEC analysis were proposed for the characterization of the viscous and osmotic pressure properties of the SMP polysaccharides. In addition, it was also extrapolated how to analyze the resistance characteristics of the concentration polarization layers formed in membrane filtration based on the molecular properties determined by the tetra-detector HPSEC analysis.

关键词： Soluble microbial productExtracellular polymeric substanceMembrane bioreactorMembrane foulingMolecular weightIntrinsic viscosity

Simulation research on scattering characteristics by complex targets

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Journal of Systems Engineering and Electronics 2007年第4期18卷 685-691页

作者： guo Kunyi sheng Xinqing Center for Electromagnetic Simulation School of Information Science and Technology Beijing Inst. of Technology Beijing 100081 P. R. China

A simulation approach based on a full-wave numerical method is presented to study electromagnetic characteristics by complex targets. How to validate simulation results is considered thoroughly under no analytical and measured data, where a double-check criterion is designed for our simulation approach. As an example, the scattering of F-117A is studied by using our simulation approach under all polarizations, different frequency bands, incident and scattering directions, etc., some of which, such as cross-polarization, bistatic RCS, have not been considered in the previous literature.

关键词： electromagnetic characteristics simulation complex targets hybrid FE-BI-MLFMA.

Hierarchically self-assembled fluorescent nanoparticles for near-infrared lysosome-targeted imaging

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Chinese Chemical Letters 2018年第12期29卷 1709-1710页

作者： Dong-sheng guo College of Chemistry State Key Laboratory of Elemento-Organic ChemistryKey Laboratory of Functional Polymer MaterialsMinistry of EducationNankai University Collaborative Innovation Center of Chemical Science and Engineering Nankai University

Manipulating emitting properties of fluorescent dyes plays a critical role in various fields such as light emitting materials, living cell imaging, and phototheranostics [1]. In particular, supramolecular strategies, such as complexation-induced quenching, aggregation-induced emission, have attracted ever-growing attention[2]. Near-infrared (NIR) probes have been demonstrated to possess

关键词： NIR Hierarchically self-assembled fluorescent nanoparticles for near-infrared lysosome-targeted imaging CB

Exact wave functions for atomic electron interacting with photon fields

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Frontiers of physics 2013年第1期8卷 39-43页

作者： Dong-sheng guo State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200062 China Permanent address: Department of Physics Southern University and A&M College Baton Rouge LA 70813 USA

Many nonlinear quantum optical physics phenomena need more accurate wave functions and corresponding energy or quasienergy levels to account for. An analytic expression of wave functions with corresponding energy levels for an atomic electron interacting with a photon field is presented as an exact solution to the Schrödinger-like equation involved with both atomic Coulomb interaction and electron-photon interaction. The solution is a natural generalization of the quantum-field Volkov states for an otherwise free electron interacting with a photon field. The solution shows that an Nlevel atom in light form stationary states without extra energy splitting in addition to the Floquet mechanism. The treatment developed here with computing codes can be conveniently transferred to quantum optics in classical-field version as research tools to benefit the whole physics community.

关键词： Volkov-Coulomb problem driven N-level atom exact wave functions and energy levels non-perturbative quantum electrodynamics strong laser fields

Structural Synthesis of a Class of 2R2T Hybrid Mechanisms

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Chinese Journal of Mechanical Engineering 2016年第4期29卷 703-709页

作者： TIAN Chunxu FANG Yuefa guo sheng School of Mechanical Electronic and Control EngineeringBeijing Jiaotong University

Conventional overconstrained parallel manipulators have been widely studied both in industry and academia,however the structural synthesis of hybrid mechanisms with additional constraints is seldom studied,especially for the four degrees of freedom（DOF） hybrid *** order to develop a manipulator with additional constraints,a class of important spatial mechanisms with coupling chains（CCs） whose motion type is two rotations and two translations（2R2T） is *** on screw theory,the combination of different types of limbs which are used to construct parallel mechanisms and coupling chains is *** basic types of the general parallel mechanisms and geometric conditions of the kinematic chains are given using constraint synthesis ***,the 2R2T motion pattern hybrid mechanisms which are derived by adding coupling chains between different serial kinematic chains（SKCs） of the corresponding parallel mechanisms are *** to the constraint analysis of the mechanisms,the movement relationship of the moving platform and the kinematic chains is derived by disassembling the coupling *** last,fourteen novel hybrid mechanisms with two or three serial kinematic chains are *** proposed novel hybrid mechanisms and construction method enrich the family of the spatial mechanisms and provide an instruction to design more complex hybrid mechanisms.

关键词： parallel mechanisms structural synthesis hybrid mechanisms screw theory

Theory of Degrees of Freedom for Parallel Mechanisms with Three Spherical Joints and Its Applications

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Chinese Journal of Mechanical Engineering 2015年第4期28卷 737-746页

作者： QU Haibo FANG Yuefa guo sheng School of Mechanical Electronic and Control Engineering Beijing Jiaotong University

The analysis of degrees of freedom（DOF） of a moving platform is the fundamental problem in kinematics of parallel mechanism. However, many problems should be considered to correctly perform the DOF calculation by using the traditional DOF criterion, and it is difficult to find a DOF criterion suitable for all kinds of mechanisms. A rule that can be used to determine the position and orientation of the moving platform is presented. Based on the proposed rule, a new form of DOF criterion is proposed, which is suitable for a class of parallel mechanisms with three spherical joints attached to the moving platform. The basic types of generalized limb structures are given based on the possible dimension of achieving the center of spherical joint attached to the moving platform, and the general steps of analyzing the DOF are presented. This proposed formula simplifies the DOF analysis of parallel mechanisms with spherical joints attached to the moving platform, and plays an important role in structural synthesis of such parallel mechanisms.

关键词： parallel mechanism DOF criterion spherical joint structural synthesis

Multi-objective Optimization of a Parallel Ankle Rehabilitation Robot Using Modified Differential Evolution Algorithm

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Chinese Journal of Mechanical Engineering 2015年第4期28卷 702-715页

作者： WANG Congzhe FANG Yuefa guo sheng School of Mechanical Electronic and Control Engineering Beijing Jiaotong University

Dimensional synthesis is one of the most difficult issues in the field of parallel robots with actuation redundancy. To deal with the optimal design of a redundantly actuated parallel robot used for ankle rehabilitation, a methodology of dimensional synthesis based on multi-objective optimization is presented. First, the dimensional synthesis of the redundant parallel robot is formulated as a nonlinear constrained multi-objective optimization problem. Then four objective functions, separately reflecting occupied space, input/output transmission and torque performances, and multi-criteria constraints, such as dimension, interference and kinematics, are defined. In consideration of the passive exercise of plantar/dorsiflexion requiring large output moment, a torque index is proposed. To cope with the actuation redundancy of the parallel robot, a new output transmission index is defined as well. The multi-objective optimization problem is solved by using a modified Differential Evolution（DE） algorithm, which is characterized by new selection and mutation strategies. Meanwhile, a special penalty method is presented to tackle the multi-criteria constraints. Finally, numerical experiments for different optimization algorithms are implemented. The computation results show that the proposed indices of output transmission and torque, and constraint handling are effective for the redundant parallel robot; the modified DE algorithm is superior to the other tested algorithms, in terms of the ability of global search and the number of non-dominated solutions. The proposed methodology of multi-objective optimization can be also applied to the dimensional synthesis of other redundantly actuated parallel robots only with rotational movements.

关键词： ankle rehabilitation parallel robot multi-objective optimization differential evolution algorithm

Self-corrosion, electrochemical and discharge behavior of commercial purity Al anode via Mn modification in Al-air battery

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Rare Metals 2021年第12期40卷 3501-3511页

作者： guo-sheng Peng Jun Huang Yi-Cheng Gu Guang-sheng Song School of Materials Science and Engineering Anhui University of TechnologyMa’anshan 243002China Key Laboratory of Green Manufacturing and Surface Technology of Advanced Metal Materials Ministry of EducationAnhui University of TechnologyMa'anshan 243002China

The self-corrosion, electrochemical and discharge behavior of commercial purity Al anode via Mn modification in Al-air battery was studied by the hydrogen evolution, weight loss, electrical conductivity, electrochemical and discharge tests. Results show that the synergetic effects of the dissolved Mn and Mn-modifying Al_(3)Fe intermetallic decrease the weight loss and inhibit the hydrogen evolution of commercial purity Al in Na OH solution when minor Mn is introduced. However, more Mn addition leads to the formation of Al_6Mn intermetallic,which has little effect on the weight loss, but accelerates the hydrogen evolution. Mn introduction plays a positive role in activating Al anodes, resulting in a decrease in the anodic polarization and an increase in the discharge voltage. Among all the commercial purity Al-x Mn anodes, 0.1 wt% Mn addition exhibits the best discharge efficiency for Al-air battery.

关键词： Commercial purity Al Mn addition Corrosion Electrochemical activity Discharge behavior

Soil formation in bauxite residue: The most promising way to large-scale and ecological disposal

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Journal of Central South University 2019年第2期26卷 265-267页

作者： XUE sheng-guo School of Metallurgy and Environment Central South University

Aluminum is an important basic raw material for national economic *** alumina industry has been expanding rapidly due to the increasing demand for *** residue is a highly alkaline solid by-product generated when alumi... 详细信息

关键词： bauxite residue promising way ecological disposal

Kinematics Analysis and Singularity Avoidance of a Parallel Mechanism with Kinematic Redundancy

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 244-261页

作者： Chaoyu Shen Haibo Qu sheng guo Xiao Li Robotics Research Center School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China China Waterborne Transport Research Institute Beijing 100088China Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control TechnologyMinistry of EducationBeijing Jiaotong UniversityBeijing 100044China

The kinematic redundancy is considered as a way to improve the performance of the parallel *** this paper,the kinematics performance of a three degree-of-freedom parallel mechanism with kinematic redundancy(3-DOF PM-KR)and the influence of redundant parts on the PM-KR are ***,the kinematics model of the PM-KR is *** inverse solutions,the Jacobian matrix,and the workspace of the PM-KR are ***,the influence of redundancy on the PM-KR is *** there exists kinematic redundancy,the PM-KR possesses fault-tolerant *** locking one actuating joint or two actuating joints simultaneously,the fault-tolerant workspace is *** the position of the redundant part is changed,the workspace and singularity will be *** results show that kinematic redundancy can be used to avoid ***,the simulations are performed to prove the theoretical analysis.

关键词： Parallel mechanism Kinematic redundancy Singularity Simulation analysis