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Zhou H.-J.,Beijing Electronic Science and Technology Vocational College | Wang M.-X.,Shaanxi University of Science and Technology | Zou W.,Siemens AG
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2015

In the PCS 7 system, which is the DCS platform of Siemens, a special control block MPC is offered for the small MIMO object, this block can realize the multi-variable model predictive control strategy. This paper introduced a solution to use MPC on air-cushioned headbox. The result of application proved that the integrated MPC block could control the air-cushioned headbox very well, even more the investment was very low compare with the stable control result. ©, 2015, China Technical Association of Paper Industry. All right reserved. Source

Li H.-F.,Beijing Electronic Science and Technology Vocational College | Chang N.,Chinese Peoples Armed Police forces Academy | Chen X.-M.,Chinese Peoples Public Security University
Journal of China Universities of Posts and Telecommunications | Year: 2010

This paper studies the methods of image digital watermarking based on wavelet transform. Firstly, the characteristics of image digital watermarking as well as its processing procedure are introduced. On this basis, the discrete wavelet transform (DWT) is selected to achieve the embedding and distilling of image digital watermarking. Simulation test proves that this algorithm can embed or distill digital watermark effectively. Meanwhile it also proves that this watermark has better abilities of hiding and anti-interference. This method results in significant amount of computational savings as well. © 2010 The Journal of China Universities of Posts and Telecommunications. Source

Qiu K.,Beijing Electronic Science and Technology Vocational College | Long Z.H.,Beijing Institute of Technology
Advanced Materials Research | Year: 2014

The performance of high strength steels is sensitive to the surface quality of machined surfaces. The effect of cutting condition on the variation of surface roughness in turning of 30CrMnSiA steel has been investigated through a serial of dry and oil-lubricant cutting tests. The characters of an amplitude characteristics set, Ra, Ry and tp, which are associated with the general shape of the machined surface profiles, are investigated in this study. It is concluded that, in the aspect of Ra and Ry values, dry cutting condition provides a similar surface roughness as in wet cutting condition under the experimental conditions of the present research; the bearing capacity of both kinds of machined surfaces, characterized by the bearing length rate tp, could be different according to the cutting parameters combinations. © (2014) Trans Tech Publications, Switzerland. Source

Yang P.,North China Electrical Power University | Hui D.X.,North China Electrical Power University | Kai Z.,North China Electrical Power University | Tian L.S.,Beijing Electronic Science and Technology Vocational College
Advanced Materials Research | Year: 2014

A path planning algorithm based on B-spline interpolation techniques was constructed for automatic welding system.The system used a B-spline curve to reconstruct the weld, it was achieved by reversing the control points of B-spline curve through the prescribed date points. The weld posture model was then obtained from the osculating plane and normal plane of B-spline curve. By taking a series coordinate transformation to the weld posture model, the torch posture model based on control terminal was provided.Experiments show that the new algorithm can readily be used for various three-dimensional welding tasks. © (2014) Trans Tech Publications, Switzerland. Source

Wu J.,Tsinghua University | Zhang C.,Tsinghua University | Mei X.,Tsinghua University | Li Y.,Tsinghua University | And 2 more authors.
Carbohydrate Polymers | Year: 2014

Enzymatic depolymerization of heparin by heparinases is promising for production of low molecular weight heparins (LMWHs) as anticoagulants, due to its mild reaction conditions and high selectivity. Here, different heparinase combinations were used to depolymerize heparin. Heparinase I and heparinase II can depolymerize heparin more efficiently than heparinase III, respectively, but heparinase III was the best able to protect the anticoagulant activities of LMWHs. Heparinase III and heparinase I/II combinations were able to efficiently depolymerize heparin to LMWHs with higher anticoagulant activity than the LMWHs produced by the respective heparinase I and heparinase II. HepIII and HepI is the best combination for maintaining high anti-IIa activity (75.7 ± 4.21 IU/mg) at the same Mw value. Furthermore, considering both the changes in molecular weight and anticoagulant activity, the action patterns of heparinase I and heparinase II were found not to follow the exolytic and processive depolymerizing mechanism from the reducing end of heparin. © 2013 Elsevier Ltd. All rights reserved. Source

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