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Online since: October 2014
Authors: Ye Tian, Xin Wang, Peng Cheng Zhao, Yang Tao Yu
The main approach to obtain nanomaterial is nanospinning technology at present. Due to the inherent characteristics of nanomaterial itself, which are easily affected by the electric field force effect of spinning. And for the spinning machine nozzle electric field is relatively complex, so nanospinning products at present, is easily affected by the electric field force and dissipated. So, the nanospinning collection efficiency is low. This paper adopts an oval enhanced electrostatic mechanism, method of using additional electric field to improve the balance obtained nanomaterial collection rate. And the construct high voltage electrostatic spinning machine virtual prototype,complete the analysis of the improved method of static electric field. The analysis results indicate that the electric field can effectively improve the collection rate of nanospinning. Through the study of the additional electric field strength further size on the electric field force and the ellipse, can more effectively improve the collection rate of nanospinning products.
Online since: December 2014
Authors: Jian Hua Zhang, Tian Yang Zhao, Lei Yu, Xu Wu
With recent development of technology and management in power market and equipment, more and more distributed generation (DG) is embedded in the distribution network. However the approach of connecting DG in most cases is based on a so-called ‘fit and forget’ policy and the capacity of DG is limited rigidly by distribution system operator to avoid the negative effects of high level penetration. New management technologies have been proposed to handle the integration of DGs in the distribution networks. In this review, the micro grid (MG) was treated as the local control method to coordinate DGs within a small area of distribution network. And the active distribution network (AND) was treated as the global control mechanism to actively manage DGs, MGs and other equipment. The operation framework of ADN was firstly introduced. Then based on the static and dynamic models of DGs and MGs, impacts of DGs and MGs on the ADN are surveyed from power quality, stability to the operation. Finally, the conclusion and suggestion is given in this paper.
Online since: September 2013
Authors: Jing Zhang, Li Wei Zhang, Tian Yang Zang
In view of the problems existing in the blended learning model, this paper presents a mobile blended learning system using mobile and wireless communication technology and context-aware Technology, and discusses the structure, functions and key technologies of the system. This system can get information about learning to use context-aware function, so as to provide adaptive learning contents and service in an intelligent way for learners.
Online since: September 2011
Authors: Xiao Tian Wang, Xiang Yang Zou, Shu Fan Wang
It is an innovative work to make the electromagnetic damper with strong magnetic material. Firstly, the structural research and the experimental research on the basic performance of electromagnetic damper have been made. Then the theoretical research is conducted based on the above research results. Thus, the paper put forward and deduced the electromagnetic damper restoring force model and the motion parameter’s effects on its performance. Such as vibration frequency and amplitude are also studied in the paper. The results showed that the new electromagnetic damper is characteristic of simple structure and good performance and that the theoretical model coincides well with the results obtained from the experiments. Keywords:strong magnetic material, electromagnetic damper restoring force model, vibration frequency, motion amplitude value.
Online since: January 2012
Authors: Shi Zhu Yang, Tian Bai Xu, Xian Long Luo
In this paper, the development and basic theory of co-rotational finite element method is introduced. The framework of constructing nonlinear element with co-rotational finite element method is proposed. Based on this framework, linear shell and beam element is easy to be extended to nonlinear problem analysis
Online since: August 2012
Authors: Song Mei Yuan, Qiang Liu, Kai Tian, Yi Qing Yang
A dynamic characteristics test and analysis system for CNC machine tool is developed based on C++/Qt platform and NI-DAQmx data acquisition driver. The function modules include hammer experiment, signal continuous acquisition, spectral analysis, frequency response function analysis and signal coherence analysis, etc. The analysis results provide the basis of dynamics characteristics simulation and cutting parameters optimization. The system can be also used to analysis the vibration of the cutting process. Spectrum analysis modules help to assess the cutting stability and diagnose problems. Experiments show that the system has good accuracy and efficiency while the size and price are decreased compare with traditional equipment.
Online since: May 2013
Authors: Xing Rong Zheng, Yun Fu, Chun Ling Tian, Jiao Yang
Describing the electron-electron interaction contribution to the Helmholtz free energy, we obtained a new fitting formula by revising the electronic exchange contribution to the Helmholtz free energy of the previous fitting formula. Using Fortran program, we calculated the curves with some sensitive parameters like the electron-electron interaction contribution to the free energy and the Coulomb coupling parameter , temperature , the mean distance between the electrons making a comparison between the revised fitting formula and the formers. It is concluded that the theoretical value of the revised fitting formula basically has agreement with the previous theoretical value at , when , the revised value completely has a consistent with the previous results. It is illustrated that the curve of the revised fitting formula is more smooth, perfect, and we obtained a very good agreement between the theoretical result of the revised Helmholtz free energy and the theoretical result of the former Padé formulas, which illustrates us to get a more accurate fitting formula and result. Therefore, the revised fitting formula is a more complete and accurate description of the thermodynamic properties of the electron-electron interaction contribution to the Helmholtz free energy.
Online since: December 2012
Authors: Yu Cai, Tian Qian Li, Xiao Ming Yang
A highly heat-dissipating and high-voltage SOI-LDMOS power device is proposed. Its substrate was selectively etched, like the Camsemi SOI, so breakdown voltage was decided only by lateral breakdown voltage. A p-type layer and a Si3N4 buried layers were introduced into the new structure for lowering specific on-resistance and temperature. The simulation results show that breakdown voltage is 747 V at the 37 μm length of the drift region, and specific on-resistance and maximum surface temperature are reduced by 94.48% and 15.43% than those of Camsemi SOI, respectively.
Online since: March 2014
Authors: Rui Song Yang, Qing Shan Fu, Ming Tian Li
Elastic modulus of a coating is an important property for design and use of the coating. At present, many methods have been put forward to evaluate the coating elastic modulus. However, each methods has special property, which make the elastic moduli from them are different. In the study, elastic modulus of a porous Ti coating has been evaluated by three-point bending test and indentation method. The results show that the coating elastic moduli from the two different methods agree well, which can reflect the uniformity of the pore structures of the porous coating. Meanwhile, the little deviations among the different test points of indentation method could reflect the uniformity of the coating structure partly.
Online since: October 2013
Edited by: De Huai Yang, Tian Biao Zhang, Qi Luo
Collection of selected, peer reviewed papers from the 2013 International Conference on Advanced Materials & Sports Equipment Design (AMSED 2013), September 21-23, 2013, Singapore.
Volume is indexed by Thomson Reuters CPCI-S (WoS).
The 73 papers are grouped as follows:
Chapter 1: Materials and Their Application;
Chapter 2: Biochemistry and Medicine;
Chapter 3: Engineering Research;
Chapter 4: Development of Sport Equipment;
Chapter 5: Computer Technology in Sports;
Chapter 6: Applied Research in Sport.
Volume is indexed by Thomson Reuters CPCI-S (WoS).
The 73 papers are grouped as follows:
Chapter 1: Materials and Their Application;
Chapter 2: Biochemistry and Medicine;
Chapter 3: Engineering Research;
Chapter 4: Development of Sport Equipment;
Chapter 5: Computer Technology in Sports;
Chapter 6: Applied Research in Sport.