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| 1 | Effect of yttrium on the microstructure of a semi-solid A356 Al alloy显示文摘The semi-solid slurry of an A356 Al alloy, which was grain-fined by yttrium, was manufactured by low temperature pouring. The effects of grain-refining on the morphology and the grain size of the primary α phase in the semi-solid A356 Al alloy were researched. The results indicate that the semi-solid A356 Al alloy with particle-like and rosette-like primary α-Al can be prepared by low temperature pouring from a liquid grain-refined A356 alloy. The grain size and particle morphology of primary α-Al in the A356 Al alloy are markedly improved by the addition of 0.5 wt.% Y. The fining mechanism of Y on the morphology and grain size of the primary α-Al in the semi-solid A356 Al alloy was delved. | LIUZheng HU Yongmei | 2008 | Rare Metals2008，27，5： | 23 |
| 2 | The fossils of Orsten-type preservation from Middle and Upper Cambrian in Hunan, China——Three-dimensionally preserved soft- bodied fossils (Arthropods)显示文摘Exquisitely preserved three-dimensional soft- bodied fossils and typical Orsten-type preservation have been found from the strata of Middle and Late Cambrian in western Hunan, China. A preliminary description is provided for Hesslandona sp. (Phosphatocopida, Crustacea, Arthro-poda) and Skara sp. (Skaracarida, Crustaceam, Arthropoda). The scientific significance of Orsten-type preservation and prospects for future work on these fossils from Hunan are outlined. | DONGXiping PhilipC.JDonoghue LIUZheng LIUJie PENGFan | 2005 | Chinese Science Bulletin2005，50，13： | 14 |
| 3 | Solute segregation in an Al_2O_(3f)/Al-4.5Cu alloy composite during solidification at different cooling rates显示文摘An Al2O3f/Al-4.5Cu composite was made by squeeze casting. The solute segregation in the composite at different cooling rates was studied. The results indicate that the primary crystal of Al-4.5Cu alloy nucleates and grows in the interstice between fibers. The fiber surface cannot serve as site for the heterogeneous nucleation of α primary dendrite. There exists an increasing Cu concentration gradient from the center of the interstice between fibers to the interface or the grain boundaries. There are the eutectic phases around the fibers. The solute segregation in the matrix increases with the cooling rate rising. The amount of eutectic phases followed by imbalance crystalline can be numerically calculated with Clyne-Kurz formula. | LIUZheng JINGQingxiu | 2005 | Rare Metals2005，24，1： | 4 |
| 4 | Easily prepared and stable functionalized magnetic ordered mesoporous silica for efficient uranium extraction显示文摘Functionalized magnetic Fe_3O_4@SiO_2 composite nanoparticles were prepared by simply embedding iron oxide nanoparticles into MCM-41 through one-step synthesis process, followed by aminopropyls grafting on the mesopore channels, aiming to efficiently and conveniently uptake U(VI) from aqueous solution. The resultant material possesses highly ordered mesoporous structure with large surface area, uniform pore size, excellent thermal stability, quick magnetic response, and desirable acids resistance, confirmed by Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM), N_2 adsorption/desorption experiments, powder X-ray diffraction(PXRD), and thermogravimetric analysis(TGA). Detailed U(VI) sorption test indicated that this material is indeed an effective U(VI) sorbent with fast sorption kinetics of less than 2 h, large sorption capacity of 160 mg/g at p H 5.0±0.1, and desirable selectivity towards U(VI) ions over a range of competing metal ions. The absorbed U(VI) can be easily desorbed by 0.01 mol/L or more concentrated HNO_3 solution, and the reclaimed sorbent can be reused with no obvious decrease of sorption capacity even after 4 sorption-desorption cycles. The present results suggest the vast opportunities of this kind of magnetic composite on the solid-phase extraction of U(VI). | Wenlu Guo Changming Nie Lin Wang Zijie Li Lin Zhu Liuzheng Zhu Zhentai Zhu Weiqun Shi Liyong Yuan | 2016 | Science China Chemistry2016，59，5： | 3 |
| 5 | Sol-gel syn- thesis of single-phase Ca5MgSi3Ol12: Eu2+ , Mn2+ phosphors for white-light emitting diodes显示文摘 | Wang Baoling Sun Liuzheng Ju Haidong | 2009 | Materials Letters2009，63，13： | 1 |
| 6 | Single-phased white-light emitting CaA;2Si2O8 : Eu2+ , Mn2+ phosphors pre- pared by a sol-gel method显示文摘 | Wang Baoling Sun Liuzheng Ju Haidong | 2009 | J Sol Gel Sci Technol2009，50，： | 1 |
| 7 | 显示文摘 | LIUZheng(刘铮) ZHUQi-Qing(朱其清) TANGLi-Hua(唐丽华) XUJun-Xiang(徐俊祥) YINChu-Liang(尹楚良) | | 土壤化学0，，： | 1 |
| 8 | Geographical distribution of trace elements-deficient soils in China显示文摘 | LIUZheng(刘铮) ZHUQiqing(朱其清) TANGLihua(唐丽华) etal | 1982 | 土壤学报1982，19，3： | 1 |
| 9 | Content and distribution of trace elements in soils of China显示文摘 | LIUZheng(刘铮) TANGLihua(唐丽华) ZHUQiqing(朱其清) etal | 1978 | 土壤学报1978，15，2： | 1 |
| 10 | 显示文摘 | LIUZheng(刘政) SUNLi-Ning(孙丽宁) SHILi-Yi(施利毅) etal | | ProgCherm(HuaxueJinzhan)0，，： | 1 |
| 11 | 显示文摘 | HuangYing(黄莹) LiuZheng(刘峥) | | 技术导向0，，： | 1 |
| 12 | Preparationandadsorbabilityofcopperionimprintedpolymer显示文摘 | LiuZheng Wen Yuqing Huangmeichun | 2007 | JournalofGuilin UniversityofTechnology2007，27，1： | 1 |
| 13 | 显示文摘 | LIUZheng ZHAOXu-yang DANGHongyuan etal(刘征 赵旭阳 党宏媛 等) | 2012 | 石家庄铁道学院学报2012，14，3： | 1 |
| 14 | STUDY ON ELEVATED TEMPERA-TURE MECHANICAL PROPERTIES OF AM50HP WITH ND显示文摘Effects of Nd on the mechanical properties of die casting magnesium alloys AM50 are investigated. It is found that the ultimate tensile strength, yield strength and elongation of the AM50 alloy at elevated temperatures up to 200 (C increase with an addition of Nd. Generally, the most significant improvement in the tensile properties is attained at 100 (C. The presence of Mg12Nd is proved by X-ray diffraction. Microstructural observations reveal that the addition of Nd can lead to the dispersion-strengthening. Due to the presence of Mg12Nd, the sliding of grain boundaries is restrained and the strength of the alloy is enhanced. It can be seen from the tensile fractographs that the fracture surfaces exhibit the mixed fracture characteristics, and less brittle fracture is observed with increasing the temperature. Quasi-cleavage fracture is thought as the main fracture mode. TEM observations expose the formation of dislocation network, slip lines and dislocation pile-ups. | LiFeng ZengXia WangYue LiuZheng ZhouJiyang | 2003 | Chinese Journal of Mechanical Engineering2003，16，3： | 0 |
| 15 | Studies on Oxidation States of Cobalt Extracted from Soils with EDTA·HO Ac·NH_4OAc显示文摘A method determining di-and tri-valent cobalt extracted from soils with EDTA·HOAc·NH4OAc solution (pH4.65) was developed based on the difference of the stability constants of Co(II) EDTA and Co(III) EDTA.Analytical results indicated that soil cobalt existed in both two oxidation states,i.e.,di-and tri-valent cobalt.Extractable di-valent cobalt in 60 soil samples collected from various soils in China ranged from 0.02 ppm to 3.54ppm,with the mean of 0.62ppm,and extractable tri-valent cobalt from 0.04 ppm to 27.65ppm,with the mean of 2.93ppm. | CAIZU-CONG LIUZHENG | 1991 | Pedosphere1991，1，2： | 0 |
| 16 | Specific Adsorption of Trivalent La, Ce and Y by Soils and Ferro-manganese Oxides and Its Mechanism显示文摘In this paper,the adsorption-desorption variations of trivalent La,Ce,Y and mixed rare earths are discussed.The curves of pH-rare earth element adsorption were very well fitted to the equation:1nD=a+b pH.The selectivity of RE(rare earth element) ions by the samples decreased in the following order:Ce>RE>La>Y,but the sequences were:La>Ce>Y on kaolinite and Y>La on amorphous iron oxide.Since the trivalent RE ions existed in the form of RE(OH)^2+ in the solutions from pH<5.45 to 7.0,the ratio of H^+ displaced to RE^3+ adsorbed in micromole was proposed to be about 2.The specific adsorption mechanism for RE was proposed to be that the RE ions complexed with oxide surface and the ion-surface complex of Ce^3+ promoted oxidization on Mn hydroxide. | RANYONG LIUZHENG | 1992 | Pedosphere1992，2，1： | 0 |
| 17 | TWO DIMENSIONAL NUMERICAL CALCULATION FOR SALT WATER INTRUSION AT ESTUARIES显示文摘Based on 2-dimensional vertically governing equations of salt water intrusion at estuaries, a method is obtained, which can predict quantitatively current velocity and salinity distribution along depth when the intrusion occurs. The volume-controlling method proposed by Patanker and Spalding is used to form the computational pattern and the Power- Law Scheme is used as the diversion pattern of the diffusion term. The comparison between the computational results and the measured ones gives a satisfactory agreement. | Wang Yigang and Zhu Liuzheng Lecturer, Hohai University, NanjingAssociate Professor, Hohai University, Nanjing | 1990 | China Ocean Engineering1990，5，3： | 0 |
| 18 | FREQUENCY-CODED OPTIMIZATION OF HOPPED-FREQUENCY PULSE SIGNAL BASED ON GENETIC ALGORITHM显示文摘The Frequency-Coded Pulse (FCP) signal has good performance of range and Doppler resolution. This paper first gives the mathematical expression of the ambiguity function for FCP signals, and then presents a coding rule for optimizing FCP signal. The genetic algorithm is presented to solve this kind of problem for optimizing codes. Finally, an example for optimizing calculation is illustrated and the optimized frequency coding results are given with the code length N=64 and N=128 respectively. | LiuZheng MuXuehua | 2005 | Journal of Electronics(China)2005，22，1： | 0 |
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