Wenzhou Vocational & Technical College

Wenzhou, China

Wenzhou Vocational & Technical College

Wenzhou, China

Time filter

Source Type

Lang W.,Wenzhou Vocational & Technical College | Zhao Z.,Wenzhou Vocational & Technical College | Du H.,CAS Shenyang Institute of Metal Research | Gao B.,Wenzhou Vocational & Technical College | And 2 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2015

A novel arc-spot control unit was developed for the arc ion plating (AIP) assisted by multi-mode AC magnetic fields. The impact of the magnetic fields, generated in different modes, on the arc-spot s motion was modeled, simulated in finite element method and tested in growth of TiN-coatings. The simulated results show that the magnetic fields significantly improves AIP performance. To be specific, the axial-symmetric diverging magnetic field pushes the arc-spots outwards; the axial-symmetric arched magnetic field confines the arc-spot trajectory; and the dynamical focusing magnetic field in reversed polarity, driven independently by the coil-currents with differrent wave-shapes, frequencies and amplitudes, drags the arc-spot to the center and increases the ionization rate and ion density because of steady plasma transport and enhanced collision probability, and as shown in the tersted results, its superposition with the diverging and/or arched magnetic fileds is capable of dynamically controlling arc-spot motion, improving arc-spot discharge and reducing particle emission. ©, 2015, Science Press. All right reserved.

Lin Y.-J.,Wenzhou Vocational Technical College | Yuan S.,Tsinghua University
Gongcheng Lixue/Engineering Mechanics | Year: 2012

Using the function approximation of tensor product, the extended Kantorovich method was successfully applied to three-dimensional problems in the paper and the non-convergence of the iteration procedure using simple function approximation was overcame. Furthermore, the iteration convergence was displayed and high accuracy and efficiency were demonstrated by numerical examples of the three-dimensional Poisson equation.

He Q.,Wenzhou Vocational & Technical College | You Z.,Wenzhou Vocational & Technical College | Kong X.,Wenzhou University
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2016

In order to improve the absolute positioning accuracy of an industrial robot, a position compensation method was proposed herein based on closed-loop feedback of the position and orientation of the end effector. The compensation utilized a laser tracker to monitor the position and orientation of the robot, by measuring the optical tooling points (OTPs) fixed on the end effector, and calculated the deviations of the position and orientation by registering nominal coordinates and the measured coordinates of the OTPs. The industrial robot system communicated with the laser tracker system by industrial LAN, and adjusted the position and orientation of the robot according to the deviation data. The experiments attached in end verified the compensation method, which shows that the location errors are reduced to 0.05 mm in maximum, and the orientation errors are reduced to 0.012 degree in maximum. © 2016, China Mechanical Engineering Magazine Office. All right reserved.

Zhang W.-P.,Wenzhou University | Wang X.-H.,Wenzhou Vocational & Technical College | He L.-L.,Wenzhou University
Chinese Journal of Polymer Science (English Edition) | Year: 2016

The aggregation behavior of cyclic rod-coil (RC) diblock copolymers in dilute solutions is investigated through dissipative particle dynamics simulation. By varying the rod length and coil length, cyclic RC copolymers in selective solvents exhibit various morphologies, including spherical micelle, vesicle, bilayer disc, and ribbon bundle structure. Compared with the equivalent linear RC copolymer, only spherical micelle and barrel bundle phase are observed. Rod length is the major factor that controls the liquid-crystalline behavior of RC copolymer systems, while the coil length has a secondary effect on the aggregate morphology. The size of rod bundle varies with the coil length, especially for the end-toend ribbon bundle and side-by-side barrel bundle, which are assembled by cyclic and linear RC copolymer solutions. This finding indicates that the ribbon bundle or nanofiber-like structure in cyclic RC copolymers can be obtained by controlling the rod length and coil length, and thus the optical and electrical properties of RC copolymer would be further controlled and optimized. Results illustrate that cyclization of a linear RC copolymer induces remarkable differences in the rod arrangement and aggregation behavior, thereby indicating the competition between interfacial energy, rod orientational entropy, coil stretching entropy, and packing constraints. © 2016, Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.

Huang X.,Zhejiang University of Technology | Huang X.,Wenzhou University | Wu D.,Wenzhou University | Ding J.,Wenzhou Vocational Technical College | And 4 more authors.
Phosphorus, Sulfur and Silicon and the Related Elements | Year: 2010

New optically active 2-thio-4-imidazolinones 3 with a chiral carbon at position-3 were synthesized from isothiocyanates 2, which were obtained from aza-Wittig reactions of vinyliminophosphoranes 1 with CS2, with easily accessible chiral (S)- or (R)-amino acid methyl ester hydrochlorides. 2-Methylthio-4H-imidazolin-4-ones 4 were obtained by the S-alkylation of compounds 3 in the presence of K2CO3 causing partial racemization of the enantiomeric pure products. These compounds were identified by MS, IR, 1H NMR, 13C NMR spectroscopy, and elemental analysis. The structures of enantiomers 3c and 3d were also confirmed by X-ray diffraction analysis. The results of preliminary bioassay indicated that compounds 4 exhibited growth inhibition of barnyard grass and cole root and stalk, and fungicidal activities against Fusarium oxysporium, Rhizoctonia solani, Gibberella zeae, Dothiorella gregaria, and Colletotrichum gossypii. Supplemental materials are available for this article. Go to the publisher′s online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file.

Ye Z.-P.,Jinggangshan University | Kang H.-J.,Wenzhou Vocational & Technical College | Yang X.-L.,Jinggangshan University
Chinese Journal of Applied Ecology | Year: 2016

Light-use efficiency (LUE) is an important parameter to assess light energy absorption of leaf. Especially, it is a key factor to affect production and quality of ecosystem. A model of LUE was developed based on a mechanistic model of light-response of photosynthesis. The maximum LUE (LUEmax) and corresponding saturation irradiance (IL-sat) were deduced according to the LUE model. At CO2 concentrations of 350, 450, 550 and 650 μmol·mol-1, the light-response curves of LUE of tomato seedling leaves were simulated. The results showed that the model of LUE described well the response curves of light use efficiency of tomato seedling leaves at four CO2 concentrations. LUE of tomato seedling leaves reached the maximum value at photosynthetically active radiation between 70-90 μmol·m-2·s-1. There were no difference of LUEmax and IL-sat at 550 and 650 μmol·mol-1. Regarding this phenomenon, it was hypothesized that the photosynthetic functions of tomato seedling leaves had acclimated to the low irradiance in greenhouse so that the intrinsic characteristic of light-harvesting pigments such as the effective light absorption cross-section of lightharvesting pigments and ratio of pigment molecules in the excited state to ground state had hardly changed at high CO2 concentrations. © 2016, Science Press. All right reserved.

Li Z.,Wenzhou Vocational & Technical College
Open Cybernetics and Systemics Journal | Year: 2015

Owing to the existence of domestic shoes product design and other technical issues for comfort, this paper raises the feasibility study on children foot measured consumer individuals on the basis of customized products produced. Children customized design shoes will enrich the level of product consumption structure, make up for gaps in the development of the domestic custom shoes, increase the competitiveness of domestic child’s shoes and has a positive meaning to explore the formation of independent product of high and mid grad child’s shoes. © Zhen Li.

Tian Q.,Wenzhou Vocational Technical College
Journal of Information and Computational Science | Year: 2012

Cooperative relaying is an efficient way to combat wireless channel fading and to increase system throughput. When applying cooperative relaying into broadband wireless systems, in which OFDM is employed, resource allocation becomes an important issue. This paper addresses the optimal Power Allocation (PA) and subcarrier pairing in non-regenerative OFDM relay system. First, we present the optimal PA algorithms for four different cases: (1) optimal PA at relay; (2) optimal PA at source; (3) optimal PA at both source and relay with independent power constraint; (4) optimal PA at both source and relay with sum power constraint. Then, based on the optimal PA algorithms, a joint power allocation and subcarrier pairing algorithm is presented, which iteratively utilizes the optimal PA algorithm and the Hungarian algorithm until convergence. The simulation results show that our proposed algorithm can efficiently improve the data rate of OFDM relay systems, comparing with fixed power allocation algorithms and fixed subcarrier pairing schemes. Copyright © 2012 Binary Information Press.

Loading Wenzhou Vocational & Technical College collaborators
Loading Wenzhou Vocational & Technical College collaborators