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Chen B.,Inner Mongolia University of Technology | Guo F.,Inner Mongolia University of Technology | Wen J.,Inner Mongolia Chemical Engineering Professional College
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2014

The effects of 1 wt% Y addition on hot compressive deformation properties of Mg-3.0Zn-0.6Zr alloy were investigated in the deformation temperature range of 523~723 K, and the strain rate range of 0.001~1 s-1 by Gleeble-1500 thermal simulation test machine. Based on dynamic materials modeling (DMM), the processing map for the test alloys was established. The influences of yttrium element on the plastic strain mechanism and processing parameter of these alloys were indicated by means of optical microscope, scanning electronic microscope and X-ray diffractometer, combined with the true stress-strain curve characteristics and microstructure evolution. The results show that the flow stress is significantly affected under different deformation conditions. The flow stress level increases with either decreasing deformation temperature or increasing strain rate. The rare-earth Y doping could effectively enhance the stress level, risen by roughly 40%, but the change trend of these curves is less affected. Additionally, the addition of yttrium element can extend power dissipation zone, which has a peak efficiency enlarged by 22%, and the peak is transferred to the 673~723 K, 0.1~1 s-1 zone, and the instability zones of flow behavior is to reduce to 523~723 K, 0.001~0.01 s-1 saddle-shaped range of the alloy including 1% yttrium. Finally, the transfer of the optimum processing parameters of hot deformation from the high deformation temperature and low strain rate range to the temperature ranging from 523 to 723 K and the strain rate ranging from 0.1 to 1 s-1 can be attained by the processing maps. Copyright © 2014, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved. Source


Dong B.,University of Science and Technology Beijing | Wang X.,Inner Mongolia Chemical Engineering Professional College
Asian Journal of Chemistry | Year: 2015

The copolymers of 6-vinyl bisferrocenylpropane with vinylbenzene, methyl acrylate and methyl methacrylate, respectively, were obtained from ferrocene and acetone via a series of reactions. The monomer and polymers were characterized by elemental analyses, IR spectra and 1H NMR. The thermal stabilities of the polymers were studied through DTA-TG. The results show that the copolymer of 6-vinyl bisferrocenylpropane with vinylbenzene decompose in higher temperature than the copolymer of 6-vinyl bisferrocenylpropane with methyl acrylate or methyl methacrylate, indicating that the introduction of the phenyl group to the polymer can improve the thermal stability of the polymer. The decomposing temperature of the copolymer of 6-vinyl bisferrocenylpropane with methyl methacrylate is a little higher than the copolymer of 6-vinyl bisferrocenylpropane with methyl acrylate, indicating that the introduction of the methyl group to the polymer can slightly improve the thermal stability of the polymer. © 2015, Chemical Publishing Co. All rights reserved. Source


Zhao M.,Inner Mongolia Agricultural University | Wang J.,Inner Mongolia Agricultural University | Wang J.,Inner Mongolia Chemical Engineering Professional College | Liu H.,Inner Mongolia Agricultural University | Chen Z.,Inner Mongolia Agricultural University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2010

By analyzing the research results of scholars overseas and domestic in recent years, the main structural factors which impact sampling efficiency were ascertained. They are the ratio of inlet height to width, the channel length, and material of hop-pocket. According to the sand sampler for performance test requirements, different construction parameter sand samplers were designed and tested in the wind erosion tunnel. The results indicate that the average sampling efficiency to soil particles of 0.15-0.60 mm is higher than intermixed dust and 0.15 mm under 6, 9, 12, 15, 18 m/s wind speed. The sampler is applicable to the acquisition of soil particles with the form of jump movement. The order of structural factors that affect sampling efficiency is the ratio of inlet height to width, the channel length, and material of hop-pocket. And the ratio of inlet height to width is the most remarkably factor. By the variance and range analysis, the optimization structure parameter of the sand sampler is as follows: the ratio of inlet height to width is 0.5, the channel length is 20 cm and the material of hop-pocket is falda. Under this situation, the average sampling efficiency of the sand sampler is 80.91%. Source


Chen B.D.,Inner Mongolia University of Technology | Guo F.,Inner Mongolia University of Technology | Wen J.,Inner Mongolia Chemical Engineering Professional College
Applied Mechanics and Materials | Year: 2014

In order to improve the understanding deformation behaviors of thermal compressive of ZK30 magnesium alloy, carried out a series of thermal compressive tests with height reduction 60% of specimens were performed at deformation temperature range of 523-673 K, and strain rates range of 0.001-1 s-1 on Gleeble-1500 thermo-mechanical simulator. Based on an Arrhenius-type equation constructs a nonlinear flow model and its constitutive equation, are employed to study the deformation behavior and the relationship between deformation temperature, strain rate and flow stress. For higher deformation temperature and lower strain rate, the true stress-strain curves show a characteristic of dynamic recrystallization. With the increase of deformation temperature and the decrease of strain rate the flow stress decreases, also the dynamic recrystallization becomes easier. © (2014) Trans Tech Publications, Switzerland. Source


Zhong Z.,Inner Mongolia Agricultural University | Zhong Z.,Benjing Sports and Vocation Training Center for the Disabled | Xing R.,CAS Qingdao Institute of Oceanology | Li P.,CAS Qingdao Institute of Oceanology | Mo G.,Inner Mongolia Chemical Engineering Professional College
International Journal of Biological Macromolecules | Year: 2010

Chitosan (CS) with two different molecular weight were modified by reacting with methyl hydrazine-dithiocarboxylate and methyl phenylhydrazine-dithiocarboxylate to give 2-(hydrazine-thiosemicarbazone)-chitosan (2-HTCHCS, 2-HTCLCS) and 2-(phenylhydrazine-thiosemicarbazone)-chitosan (2-PHTCHCS, 2-PHTCLCS). The structure of the derivatives was characterized by FT-IR spectroscopy and elemental analysis. The antioxidant activities of the derivatives were investigated employing various established systems, such as hydroxyl radical (OH)/superoxide anion (O2 .-) scavenging/reducing power and chelating activity. All of the derivatives showed strong scavenging activity on hydroxyl radical than chitosan and ascorbic acid (Vc), and IC50 of 2-HTCHCS, 2-HTCLCS, 2-PHTCHCS and 2-PHTCLCS was 0.362, 0.263, 0.531 and 0.336mg/mL respectively. The inhibitory activities of the derivatives toward superoxide radical by the PMS-NADH system were strong. The results showed that the superoxide radical scavenging effect of 2-[phenylhydrazine (or hydrazine)-thiosemicarbazone]-chitosan were higher than that of chitosan. The derivatives had obviously reducing power and chelating activity. The data obtained from vitro models clearly establish the antioxidant potency of 2-[phenylhydrazine (or hydrazine)-thiosemicarbazone]-chitosan. © 2010 Elsevier B.V. Source

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