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Search Results: 1 - 10 of 3267 matches for " Guangqing Shang "
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Research Status of Wind Energy Piezoelectric Generator  [PDF]
Chunhua Sun, Guangqing Shang
Energy and Power Engineering (EPE) , 2018, DOI: 10.4236/epe.2018.1012031
Abstract: It is of great significance for developing self-powered micro-devices to explore the research of piezoelectric effect in conversion of wind energy into electricity. Based on the different excitation modes, the existing wind energy piezoelectric generators are firstly classified. The research status of wind piezoelectric generators is further analyzed, and characteristics of various types of wind energy piezoelectric generators are summarized. Finally, the future research direction and emphasis of wind energy piezoelectric generators is proposed to carry out its miniaturization, lightweight and integration.
Cymbal Structural Optimization for Improving Piezoelectric Harvesting Efficiency with Taguchi’s Orthogonal Experiment  [PDF]
Guangqing Shang, Wei Ning, Chunhua Sun
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.310002

To improve piezoelectric harvesting efficiency of Cymbal, optimization design of Cymbal parameters was studied with the method of Taguchi’s orthogonal experiment. The effective factors of piezoelectric harvesting property were firstly analyzed. The orthogonal experiment schedule was then designed. The finite element model of Cymbal was built via ASPL tool in ANSYS software and static analysis was done. The experimental results were gotten with developed program. The optimization level of each factor was gained. Under the synthetical optimization level of each design factor, the piezoelectric analysis was tested and the open voltage of 236.476 V was revealed with improving 35.73% than the maximum voltage of 174.228 V in the orthogonal experiment. The average voltage of 229.98 V was measured with the manufactured optimized Cymbal structure design. The relative error was 2.54% between simulation and measured data. It indicated that the optimization design schedule was reasonable. Cymbal harvester with the optimized parameters could scavenge larger voltage.

On Piezoelectric Energy Harvesting from Human Motion  [PDF]
Chunhua Sun, Guangqing Shang, Hongbing Wang
Journal of Power and Energy Engineering (JPEE) , 2019, DOI: 10.4236/jpee.2019.71008
Abstract: With the rapid development of low-power communication technology and microelectronics technology, wearable and portable embedded health monitoring devices, micro-sensors, and human body network positioning devices have begun to appear. For seeking reliable energy sources to replace battery on these devices, it is of great significance for developing low power products to explore the research of piezoelectric effect in conversion of human motion into electricity. Based on the different human motions, the existing technology of piezoelectric energy harvester (PEH) is firstly classified, including PEHs through heel-strike, knee-joint, arm motion, center of mass. The technology is then summarized and the direction of future development and efforts is further pointed out.
Multi-Direction Piezoelectric Energy Harvesting Techniques  [PDF]
Chunhua Sun, Guangqing Shang
Journal of Power and Energy Engineering (JPEE) , 2019, DOI: 10.4236/jpee.2019.79003
Abstract: With the development of portable and self-powering electronic devices, micro-electromechanical system (MEMS) and wireless sensor networks, research on piezoelectric energy harvesting techniques has been paid more and more attention. To enhance the ambient adaptability and improve the generating efficiency, the multi-directional piezoelectric energy harvesting techniques turns to be a research hotspot. The current status of the multi-directional piezoelectric energy harvesting techniques was firstly reviewed. The characteristics of existed multi-directional piezoelectric harvester were then analyzed. An improved structure of multi-directional piezoelectric harvester was finally proposed. The multi-directional piezoelectric energy harvester has a good prospect in miniaturization, more sensitive to vibration directions and better energy efficiency.
Finite Element Analysis of Vehicle Load Effect on Harvesting Energy Properties of a Piezoelectric Unit  [PDF]
Chunhua Sun, Hongbing Wang, Jie Liu, Guangqing Shang
Energy and Power Engineering (EPE) , 2015, DOI: 10.4236/epe.2015.710047
Abstract: To realize the goal of harvesting energy from pavement vibration on a large scale, a new type of piezoelectric harvesting units as the energy transducer has been proposed. The piezoelectric harvesting units are paved 40 mm below the asphalt, which is the same as thickness of the top layer of typical asphalt pavement in China. The spacing distance is 2200 mm, which is the same as the one between two tires of a normal vehicle. A mathematical model of the unit is deduced on Meda empirical formula and Hamilton principle and piezoelectric equations. Effects of the external vehicle load on its harvesting energy properties and pavement deformation and stress are analyzed with the finite element method. The results show that the excited voltage is linearly variation with contact pressure while the harvested electrical energy exponential varies with contact pressure. The more the contact pressure is, the larger the harvested electrical energy and the deformation and stress are. The harvested electrical energy also increases with the load frequency. At least 100 mJ of electrical energy can be collected with the proposed piezoelectric harvesting unit. It shows that the technology application of the piezoelectric harvesting energy from pavement is promising.
Parameters Optimization for Piezoelectric Harvesting Energy from Pavement Based on Taguchi’s Orthogonal Experiment Design  [PDF]
Chunhua Sun, Hongbing Wang, Guangqing Shang, Jianhong Du
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.34016
Abstract: To effectively harvest vibration energy from pavement without affecting driving comfort and safety, parameter optimization was done with the orthogonal experiment design and the finite element analysis. L16(44) Taguchi’s orthogonal experiments were carried out with planted depth, PZT material, PZT diameter and thickness as optimization parameters and with open voltage and pavement displacement as optimization objectives. The experiment results were obtained via the finite element method. By using range analysis method, the dominance degree of the influencing factors and the optimum condition was obtained for the two objectives, respectively. Further, the multi-objective optimization was performed based on a weight grade method. The combined optimum conditions in order of their dominance degree are PZT diameter 35 mm, PZT thickness 6 mm, planted depth 50 mm and material PZT4. The validity of optimization scheme was confirmed.
Receptor-Mediated Endocytosis and Brain Delivery of Therapeutic Biologics
Guangqing Xiao,Liang-Shang Gan
International Journal of Cell Biology , 2013, DOI: 10.1155/2013/703545
Abstract: Transport of macromolecules across the blood-brain-barrier (BBB) requires both specific and nonspecific interactions between macromolecules and proteins/receptors expressed on the luminal and/or the abluminal surfaces of the brain capillary endothelial cells. Endocytosis and transcytosis play important roles in the distribution of macromolecules. Due to the tight junction of BBB, brain delivery of traditional therapeutic proteins with large molecular weight is generally not possible. There are multiple pathways through which macromolecules can be taken up into cells through both specific and nonspecific interactions with proteins/receptors on the cell surface. This review is focused on the current knowledge of receptor-mediated endocytosis/transcytosis and brain delivery using the Angiopep-2-conjugated system and the molecular Trojan horses. In addition, the role of neonatal Fc receptor (FcRn) in regulating the efflux of Immunoglobulin G (IgG) from brain to blood, and approaches to improve the pharmacokinetics of therapeutic biologics by generating Fc fusion proteins, and increasing the pH dependent binding affinity between Fc and FcRn, are discussed. 1. Introduction This review is focused on the receptor-mediated endocytosis, transcytosis, and brain delivery of therapeutic biologics across the blood-brain-barrier (BBB). Transport of macromolecules across the BBB involves both specific and nonspecific interactions with proteins and receptors expressed on the luminal and/or the abluminal surfaces of the brain capillary endothelial cells. Endocytosis and transcytosis play important roles in the transport of macromolecules. The function of the neonatal Fc receptor (FcRn), the low density lipoprotein receptor related protein (LRP), the transferrin receptor (TfR), and the insulin receptor (IR) in regulating the endocytosis and transcytosis of immunoglobulin, peptides, and proteins across BBB has been studied. Due to the tight junction of BBB, brain delivery of traditional therapeutic proteins with large molecular weight is generally not possible. Over the past years, multiple methods have been attempted for brain delivery of drugs [1, 2]. Efficient brain delivery methods through receptor-mediated endocytosis and transcytosis have been developed based on the current knowledge of ligands and antibodies against the receptors on the brain endothelial cell surfaces. New peptides and antibodies with specific ability to cross the BBB have been reported. Angiopep-2, a peptide ligand of LRP1, was identified with high permeability across the BBB [3, 4].
On the Stability of the Defocusing Mass-Critical Nonlinear Schr?dinger Equation  [PDF]
Guangqing Zhang
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2016, DOI: 10.4236/ijmnta.2016.53012
Abstract: We consider the defocusing mass-critical nonlinear Schr?dinger equation in the exterior domain \"\" in \"\"(\"\"). By analyzing Strichartz estimate and utilizing the inductive hypothesis method, we prove the stability for all initial data in \"\".

SUN Chunhua,SHANG Guangqing,LI Yaohui,

力学与实践 , 2008,
Abstract: The design method of medical elastic assistive devices based on reverse engineering is proposed, and the expression for calculating strain energy of the elastic device is deduced in the paper. To increase design efficiency, the techniques of mesh simplification and parameterization are used respectively for decreasing scanned data and changing three dimensional data into two dimensional one. To provide doctors and sufferers with scientific foundation for choose of medical device, the relationship between the device dimension and the strain energy is constructed by using the density function of strain energy.
Measuring Public School Competition from Private Schools: A Gravity-Based Index  [PDF]
Kaustav Misra, Guangqing Chi
Journal of Geographic Information System (JGIS) , 2011, DOI: 10.4236/jgis.2011.34027
Abstract: This research develops a gravity-based index of public school competition from private schools within local markets. Proponents of educational reform often call for policies to increase competition between schools. A major hurdle for researchers examining this issue is to determine a workable definition of “competition” by which they can measure the degree of competition within local markets. This study addresses this challenge by developing a school competition index for public schools in the Jackson metropolitan area of Mississippi, USA that considers the enrollments in public schools and the enrollments in their neighboring private schools, as well as the distances between them. The school competition index reveals the degree of competition for each public school based on its spatial location relative to peer private schools operating within its service area. This methodology can be useful for evaluating competition in other markets and redefining the traditional market structure.
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