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Effects of Heat Treatment Process Parameters on Microstructure and Mechanical Properties of DP440Cold Rolled Strip

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Journal of Iron and Steel Research International 2014年第5期21卷 509-516页

作者： Gang HUO Yi-ming CEN zhen-xing li Guo-dong li Chang-sheng li State Key Laboratory of Rolling and Automation Northeastern University Pohang Cold Strip Rolling Co. Ltd.

In order to optimize the production process, improve the production efficiency and accelerate the development and application of the domestic dual-phase steel, the effects of heat treatment process parameters on microstructure and mechanical properties of DP440 cold rolled strip were studied by the CAS-300 simulated continuous annealing equipment. When the heating rate increased from 5 to 100 ℃/s, both the tensile strength and yield strength increased because of the decreased grain size. When the intercritical annealing temperature increased from 780 to 850 ℃, the martensite content decreased so that the tensile strength decreased first, then increased, and the yield strength increased. When the rapid cooling rate increased from 25 to 100 ℃/s, because the martensite content increased, the tensile strength increased, while the yield strength decreased. When the overaging temperature increased from 260 to 400 ℃, the tensile strength decreased, while the yield strength increased. When the overaging time increased from 240 to 480 s, the tensile strength decreased a little, while the yield strength increased a little.

关键词： dual-phase steel heat treatment microstructure mechanical property

Application of numerical simulation to flow induced corrosion in flowing seawater system

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中国有色金属学会会刊：英文版 2004年第z1期14卷 439-442页

作者： liU Jing-jun liN Yu-zhen YONG xing-yue li Xiao-yu School of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China School of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China School of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China School of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China

An established model was presented as a new kind of means for investigating flow induced corrosion. In this method the near-wall hydrodynamic parameters including wall shear stress τ and mass transfer coefficient k near the wall of materials can be numerically calculated, and combining corrosive kinetics tested by experiments, the corrosion rates can be also calculated accurately. The flow induced corrosion mechanism was further verified by numerical results in this model, and the various corrosion phenomena were explained. The modelled results also show that the ability to accurately utilize numerical method to study flow induced corrosion strongly to some extent depends on material corrosive kinetics processes tested by experiments.

关键词： flow induced corrosion numerical simulation near-wall hydrodynamic parameters mechanism

Anti-allergic effects of ethanol extracts from brown seaweeds

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第2期10卷 147-153页

作者： Haider SAMEE zhen-xing li Hong liN Jamil KHAliD Yong-chao GUO Food Safety Laboratory College of Food Science and Engineering Ocean University of China Qingdao 266003 China Food and Marine Resources Research Centre Pakistan Council of Scientific and Industrial Research (PCSIR) Laboratories Complex Karachi 75280 Pakistan

Ethanol extracts of brown seaweeds from Pakistan and China were isolated and compared for their antiallergenic activities. They included Sargassum tennerimum (ST) and Sargassum cervicorne (SC) from Pakistan, and Sargassum gramini- folium turn (SG), Sargassum thunbergii (STH), and Laminaria japonica (LJ) from China. The ethanol extracts of these brown seaweeds were optimized at 85% (v/v) ethanol for the maximum yield of phlorotannin, an inhibitor against hyaluronidase. Total phlorotannins contained in the crude extracts were measured as 1.71% (SG), 0.74% (STH), 0.97% (LJ), 3.30% (SC), and 5.06% (ST). The 50% inhibitory concentrations (IC50) of Pakistani SC and ST were 109.5 and 21 μg/ml, respectively, lower than those of Chinese SG, STH, and LJ (134, 269, and 148 μg/ml, respectively). An antiallergic drug, disodium cromoglycate (DSCG), had an IC50=39 μg/ml, and a natural inhibitor of hyaluronidase, catechin, had an IC50=20 μg/ml. The IC50 of ST extract was found similar to that of catechin (21 vs 20 μg/ml) and lower than that of DSCG (21 vs 39 μg/ml). This suggests that ST is a potent inhibitor of hyaluronidase, indicating a promising future development of natural antiallergic medicines or functional foods.

关键词： Anti-allergic activity Brown seaweed Ethanol extracts Hyaluronidase Phlorotannin

Rare earth-based MOF@mesoporous silica nanoplatform for long-term and luminescence trackable chemotherapy

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Rare Metals 2022年第8期41卷 2701-2710页

作者： Lu-Min Wang Wen-Yan liu Ming-liang Hu Jia-Sai Yao Ping Wang Jia-Hao liu Miao He Yi Gao zhen-xing li Gastroenterology Department The Second Affiliated Hospital of Xi’an Jiaotong UniversityXi’an710004China Digestive Diseases in Precision Medicine Institute The Second Affiliated Hospital of Xi’an Jiaotong UniversityXi’an710004China State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of Petroleum(Beijing)Beijing102249China

Developing the multifunctional nanocarriers for long-term drug release and luminescence traceability is a challenging *** this task,we designed a novel nanoplatform for long-term and luminescence trackable chemotherapy,which is prepared via a hollow ZIF-8(where ZIF is zeolitic imidazolate frameworks)coated by the Eu^(3+)-doped mesoporous silica(ZIF-8@mesoporous silica).The hollow ZIF-8 is used as a drug library for loading the anticancer drug,and the pH-sensitive properties of ZIF-8 can targeted-release drugs in the tumor and cut down the poisonousness of drugs to normal *** shell layer of mesoporous silica can achieve the long-term drug release,which solves the problem of short drug circulation time in the body,reduces the drug administration frequency,and improves the therapeutic ***,the ZIF-8@mesoporous+doxorubicin(DOX)is injected only once during the 14-day *** addition,Eu^(3+)doped in mesoporous silica ensures luminescence tracking and detection of drug pathways in living ***,this nanoplatform provides a whole new strategy for the longterm treatment of tumors.

关键词： Rare earth ZIF-8 Mesoporous silica Long-term chemotherapy Luminescence traceability Nanocarrier

Fusion of VNIR and Thermal Infrared Remote Sensing Data Based on GA-SOFM Neural Network

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Geo-Spatial Information Science 2009年第4期12卷 271-280页

作者： WANG Chongchang YANG Guijun MA zhen li xing Zhurong School of Geomatics Liaoning Technical University 47 Zhonghua Road Fuxin 123000 China

The multi-source data fusion methods are rarely involved in VNIR and thermal infrared remote sensing at present. Therefore, the potential advantages of the two kinds of data have not yet been adequately tapped, which results in low calculation precision of parameters related with land surface temperature. A new fusion method is put forward where the characteristics of the high spatial resolution of VNIR （visible and near infrared） data and the high temporal resolution of thermal infrared data are fully explored in this paper. Non-linear fusion is implemented to obtain the land surface temperature in high spatial resolution and the high temporal resolution between the land surface parameters estimated from VNIR data and the thermal infrared data by means of GA-SOFM （genetic algorithms ＆ self-organizing feature maps）-ANN （artificial neural net-work）. Finally, the method is verified by ASTER satellite data. The result shows that the method is simple and convenient and can rapidly capture land surface temperature distribution of higher resolution with high precision.

关键词： fusion VNIR data thermal infrared land surface parameter GA-SOFM mapping ANN

Photocatalytic Dissociation of CH3OH on ZnO(0001) Surface

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Chinese Journal of Chemical Physics 2019年第5期32卷 525-530页

作者： Peng-xiao liang Fei Xu zhen-xing li Zhi-wen Luan xing-an Wang Qing Guo Xue-ming Yang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics University of Science and Technology of China Hefei 230026 China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Department of Chemistry School of Science Southern University of Science and Technology Shenzhen 518055 China

Photocatalysis of CH3OH on the ZnO(0001) surface has been investigated by using temperature-programmed desorption (TPD) method with a 266 nm laser light. TPD results show that part of the CH3OH adsorbed on ZnO(0001) surface are in molecular form, while others are dissociated. The thermal reaction products of H2, CH3·, H2O, CO, CH2O, CO2 and CH3OH have been detected. Experiments with the UV laser light indicate that the irradiation can promote the dissociation of CH3OH/CH3O· to form CH2O, which can be fu- ture converted to HCOO- during heating or illumination. The reaction between CH3OHZn and OHad can form the H2O molecule at the Zn site. Both temperature and illumination promote the desorption of CH3· from CH3O·. The research provides a new insight into the photocatalytic reaction mechanism of CH3OH on ZnO(0001).

关键词： Methanol Photocatalysis ZnO(0001) surface Temperature-programmed desorption

Studies on extraction of In(Ⅲ) with 8-hydroxyquinoline

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Chinese Journal of Chemistry 1994年第1期12卷 19-25页

作者： SONG, Kui-Yuan YANG, Jia-zhen liU, xing-Zhi li, HongDepartment of Chemistry, liaoning University, Shenyang, liaoning 110036, China

The equilibrium molalities of In3+ in extraction reaction: In3+(aq)+3HOx(org) = In(Ox)_3(org) + 3H+(aq) were measured at ionic strengths from 0.13 to 2.54 mol-kg~ ... 详细信息

The equilibrium molalities of In3+ in extraction reaction: In3+(aq)+3HOx(org) = In(Ox)_3(org) + 3H+(aq) were measured at ionic strengths from 0.13 to 2.54 mol-kg~ (-1) in the aqueous phase containing Na2SO4 as the supporting electrolyte and at constant initial molality of extractant, HOx, in the organic phase at temperatures from 278.15 to 308.15 K, where HOx and Ox mean 8-hydroxy-quinoliue and its anion, respectively. The standard extraction constants K0 at various temperatures were obtained by two methods proposed in our previous paper.

关键词： Extraction equilibrium constant Pitzer's equation.

Local magnetic moment oscillation around an Anderson impurity on graphene

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 192-201页

作者： Shuai li zhen Ma Jin-Hua Gao School of Science Hebei University of Science and Technology School of Electronics and Information Zhengzhou University of Light Industry School of Physics and Wuhan National High Magnetic Field Center Huazhong University of Science and Technology

We theoretically investigate the spin resolved Friedel oscillation （FO） and quasiparticle interference （QPI） in graphene induced by an Anderson *** the impurity becomes magnetic,the resulted FO becomes spin dependent,which gives rise to a local magnetic moment oscillation with an envelop decaying as r-2in real space in the doping ***,at half filling,the electron density and local magnetic moment will not oscillate but decay as *** spin resolved FO has both sublattice and spin ***,the local magnetic moment decay at half filling only occurs at one sublattice of graphene,which is quite like the phenomenon observed in the STM experiment (***ález-Herrero et al.,Science 352,437 （2016）).We further give an analytic formula about such spin dependent FO based on the stationary phase ***,we study the interference of quasiparticles around the magnetic impurity by calculating the spin dependent Fourier-transformed local density of states （FT-LDOS）.Our work gives a comprehensive understanding about the local magnetic moment oscillation around an Anderson impurity on graphene.

关键词： Friedel oscillation local magnetic moment graphene Anderson impurity

Photodissociation Dynamics of CS_(2) Near 204 nm: The S(^(3)PJ)+CS(X^(1)∑^(+)) Channels

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Chinese Journal of Chemical Physics 2021年第1期34卷 95-101,I0012页

作者： Min Zhao zhen-xing li Ting Xie Yao Chang Fu-yan Wu Qin Wang Wen-tao Chen Tao Wang xing-an Wang Kai-jun Yuan Xue-ming Yang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Science Sothern University of Science and TechnologyShenzhen 518055China

We study the phot odissociation dynamics of CS2 in the ultraviolet region using the time-sliced velocity map ion imaging *** S(3 Pj)+CS(X1E+)product channels were observed and identified at four wavelengths of 201.36,203.10,204.85 and 206.61 *** the measured images of S(3Pj=2,1,0),the vibrational states of the CS(X1E+)co-products were partially resolved and the vibrational state distributions were ***,the product total kinetic energy releases and the anisotropic parameters were *** relatively small anisotropic parameter values indicate that the S(3Pj=2丄0)+CS(X1E+)channels are very likely formed via the indirect predissociation process of *** study of the S(3Pj=2,1;0)+CS(X1E+)channels,which come from the spin-orbit coupling dissociation process of CS2,shows that nonadiabatic process plays a role in the ultraviolet photodissociation of CS2.

关键词： Carbon disulfide Time-sliced velocity map ion imaging Photodissociation