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Controlled synthesis and magnetic properties of Fe_3O_4 walnut spherical particles and octahedral microcrystals

Science china(Technological Sciences) 2008年第11期51卷 1911-1920页

作者： JIAO Hua1,2.& YANG HeQing1 1 Key Laboratory of Macromolecular Science of Shaanxi Province, School of chemistry and Materials Science, Shaanxi Normal University, Xi’an 710062. china 2.{2. of chemistry and Chemical Engineering, Weinan teachers University, Wei nan 714000, china Key Laboratory of Macromolecular Science of Shaanxi Province School of Chemistry and Materials Science Shaanxi Normal University Xi’an 710062 China department of chemistry and Chemical Engineering Weinan Teachers University Wei nan 714000 China

Magnetite Fe3O4 walnut spherical particles and octahedral microcrystals were suc- cessfully synthesized from K4 [Fe (CN) 6], K3 [Fe (CN) 6] and NaOH reagents via a simple hydrothermal process. And the uniform morphology of octahedral micro- crystals was obtained in the presence of ethylene glycol. The morphology and structure of products were characterized by powder X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results showed that the Fe3O4 walnut spherical particles and octahedral microcrystals were single crystals with the face-center cubic structure and with size distributions from 2.2.to 8.6 μm and 1.6 to 12.5 μm, respectively. Their magnetic properties were detected by a vibrating sample magnetometer at room temperature. The walnut spherical parti- cles exhibited a ferromagnetic behavior with the coercive force (Hc), saturation magnetization (Ms) and remanent magnetization (Mr) being 150.57 Oe, 97.634 and 12.05 emu/g, respectively. For the octahedral microcrystals they were 75.2. Oe, 101.90 and 6.69 emu/g, respectively. Different sizes of walnut spherical particles were controlled synthesized through adjusting the NaOH concentration. It was found that ethylene glycol molecules have a significant effect on the formation of Fe3O4 octahedra. A possible mechanism was also proposed to account for the growth of these Fe3O4 products

关键词： a hydrothermal route Fe3O4 walnut spherical particles octahedral microcrystals magnetic property

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2.02.武术竞赛规则对竞技武术套路竞赛的导向作用

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天津体育学院学报 2005年第1期20卷 71-72页

作者：杨新南通师范学院体育系南通226007

中华武术源远流长,武术套路运动作为中国传统的体育项目,具有悠久的历史,是东方文化的一种象征,其作为非奥运项目登上全国比赛的历史可追溯到1959年第一届全运会.经过近半个世纪的发展,竞技武术套路在武术竞赛规则的导向作用下历经巨变... 详细信息

中华武术源远流长,武术套路运动作为中国传统的体育项目,具有悠久的历史,是东方文化的一种象征,其作为非奥运项目登上全国比赛的历史可追溯到1959年第一届全运会.经过近半个世纪的发展,竞技武术套路在武术竞赛规则的导向作用下历经巨变.尤其是在进入2.世纪后,竞技武术套路为了要与"更高、更快、更强"的奥林匹克宗旨相结合,同时也为了使武术竞赛更具有可比性、区分度和公平性,国家体育总局武术管理中心于2.02.出台了武术竞赛新规则.随着新规则的实行,竞技武术套路以全新的面貌登上了历史舞台.2.02.赛新规则出台之初,众多武术界的仁人志士对新规则提出了种种质疑.本文通过对2.02.及2.03年全国武术套路冠军赛的比赛数据进行数理统计分析,试图探讨2.02.赛新规则对竞技武术套路竞赛的导向作用,同时也为各级教练员和运动员的训练提供理论参考.

关键词： 2.02.武术竞赛规则数理统计竞技武术套路

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Synthesis of Macrocyclic Arsinous Acid Esters

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Chinese Chemical Letters 1999年第12期10卷 0-0页

作者： Xin You CHENI Ying Qin YANG Wen Tian TAO(1’department of chemistry, Xiaogan {2. college, Hubei 432.00)(2.0} of chemistry, Xinyang {2. college, Henan 464000)(3department of chemistry, Wuhan University, Wuhan 430072. Xiaogan teachers Coll Dept Chem Hubei 432100 Peoples R China Xinyang teachers Coll Dept Chem Henan 464000 Peoples R China Wuhan Univ Dept Chem Wuhan 430072 Peoples R China

The reactions of the his (dimethylamino) alkylarsine with dids lead to the formations ofmacrocyclic arsinous acid esters. The synthesis of title compounds was described and theirslructures were characterized by elemen... 详细信息

关键词： Bis (dimethylamino) alkylarsine macrocyclic arsinous acid ester synthesis.

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Internal noise stochastic resonance in CO oxidation on nm-sized palladium particles

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Science china chemistry 2005年第5期48卷 395-401页

作者： GONG Yubing1,2. HOU Zhonghuai1 & XIN Houwen1 1. department of Chemical Physics, University of Science and Technology of china, Hefei 2.002., china 2. department of Physics, Yantai teachers University, Yantai 2.402., china 1. department of Chemical Physics University of Science and Technology of China 230026 Hefei China 2. department of Physics Yantai Teachers University 264025 Yantai China

Based on a stochastic mesoscopic model, the influence of internal noise on the oscillatory kinetics of the catalytic oxidation of CO on nm-sized palladium particles is studied, using the chemical Langevin equations, Poisson approximation algorithm, and exact stochastic simulation algorithm. The reaction rate oscillations are of stochastic nature due to considerable internal noise in such mesoscopic systems. It is found that the performance of the stochastic oscillations undergoes a maximum with the variation of internal noise level for a given CO partial pressure, which demonstrates the occurrence of internal noise stochastic resonance. This phe-nomenon implies that optimal internal noise would favor the reaction rate oscillation of CO oxi-dation on nm particles. Such a phenomenon is robust to the change of external parameters, such as CO pressures.

关键词： nanometer-sized palladium particles, surface catalytic CO oxidation, internal noise, stochastic resonance, chemical Langevin equation.

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Stochastic resonance in surface catalytic oxidation of carbon monoxide induced by colored noise

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Science china chemistry 2004年第2期47卷 106-112页

The dynamical behavior of surface catalytic oxidation reaction of Pt(110)/CO+O2.modulated by colored noise, under the condition of specific temperature, has been investigated when the partial pressure of CO gas is near the supercritical Hopf bifurcation point. By computer simulation the oscillation and stochastic resonance induced by colored noise are observed. The influences of the intensity and correlation time of colored noise on stochastic resonance are discussed. The range of sensitivity of the system to the environmental fluctuation is analyzed.

关键词： colored noise, stochastic resonance, surface catalytic reaction of Pt(110)/CO+O2. supercritical Hopf bifurcation, signal-to-noise ratio (SNR).

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Preparation and Characterization of Chitosan/Carboxymethylated Konjac Glucomannan Blend Films

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Wuhan University Journal of Natural Sciences 2002年第1期7卷 107-112页

作者： Zheng Hua 1 , Du Yu-min 2.1. department of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, china 2. {2. of chemistry and Molecular Sciences, Wuhan University, Wuhan 430072. Hubei, china Wuhan University of Technology Department of Chemical Engineering Wuhan Hubei China (GRID:grid.162110.5) (ISNI:***) Wuhan University College of Chemistry and Molecular Sciences Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***)

In order to improve the mechanical and water swelling properties of the chitosan (CS) film, a series of transparent films were prepared by blending 2.(weight) chitosan acetic acid solution with 1.5%(weight) carboxymethylated konjac glucomannan (CMKGM) aqueous solution according to predetermined ratio and drying at 30°C. The morphological structure, miscibility, thermal stability, mechanical properies, and swelling capacity of the blend films were studied by infrared (IR), X-ray diffraction (XRD), differential thermal analysis (DTA), scanning electron micrograph (SEM), and measurements of the mechanical properties and swelling properties. The results demonstrated that there was strong interaction and good miscibility between CS and CMKGM resulted from intermolecular hydrogen bonding and electrostatic force. The mechanical properties in dry state and wet state, thermostability, and water swelling properties of the blend films were obviously improved. The best values of the tensile strength in the dry and wet state achieved 89 MPa and 49 MPa, respectively, when the CMKGM content was 30%(weight). The CS/ CMKGM blend films provided promising biomedical applications.

关键词： Key words chitosan carboxymethylated konjac glucomannan blend films structure characterization

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康有为的学校体育思想

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体育科学 2004年第3期24卷 64-66页

作者：何叙南通师范学院体育系江苏南通226007

康有为的学校体育思想是其教育思想的重要组成部分 ,康有为在中国首倡德、智、体全面发展 ;根据不同年龄阶段教育的特点 ,来确定体育的地位与内容 ;重视儿童的健康教育。

关键词：康有为学校体育思想

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^(31)P solid-state NMR spectroscopy of VPO catalysts

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Chinese Science Bulletin 1997年第16期42卷 1370-1372页

作者： LI Mingxiu and YANG Shutaodepartment of chemistry, Hebei {2. college, Shijiazhuang 050091, china department of chemistry Hebei Teachers College Shijiazhuang China

VPO are well-known catalysts for the oxidation of n-butane to maleic anhydride. The catalytic behavior is influenced by several factors, such as the phase composition and the vanadium oxidation state of VPO catalysts. These catalysts have been characterized by means of XRD and XPS, but it is difficult to detect the presence of low concentrations of VOPO4 phases

关键词： 31P solid-state NMR spectroscopy VPO catalyst Tm n-butane maleic anhydride.

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The Relationship Among Photoinhibition, Photooxidation and Early Aging at a Late Development Stage in Different Varieties with High Yield

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Agricultural Sciences in china 2002年第6期1卷 618-625页

作者： JIAO De-mao, LI Xia, HUANG Xue-qing and JI Ben-hua( Institute of Agrobiological Genetics and Physiology, Jiangsu Academy of Agricultural Sciences , Nanjing 2.0014 , P.R. china department of Biology, {2. Normal college, nantong 226007 , P.R. china) Institute of Agrobiological Genetics and Physiology Jiangsu Academy of Agricultural Sciences Nanjing 210014 P. R . China department of Biology Nantong Normal College Nantong 226007 P. R . China

Using six high yield varieties from different ecological districts in china the parameters of Chl fluorescence, the performance of membrane lipid peroxidation and the reduction of Chl content in flag leaf under natural condition at the later developmental stages (from heading stage to mature stage). The results showed that Fv/Fm , decreased gradually, the excessive light energy led to the accumulation of active oxygen O2., H2.2.and the product of membrane-lipid peroxidation, MDA, which resulted in the reduction of Chl content and early aging due to photooxidation during the course of senescence of flag leaf. This phenomenon varied obviously in rice varieties. When comparina japonica tolerant to photooxidation, Fv/Fm in indica shanyou 63 susceptible to photoxidation decreased significantly. An increase of active oxygen and a sharp drop of Chl content, resulted in 'yellowish' early aging and influenced filling and setting of rice grain. The mechanism on early aging in indica was related to light and temperature conditions in filling stages. On a fine day (above 2.1), PS Ⅱ reaction center exhibited a dynamic change on revisable inactivation. Under strong midday light, PS Ⅱ function in indica exhibited obvious down-regulation and photoinhibition; Under strong light with low temperature, PS Ⅱ resulted in photodamage, showing early aging, which were related to the degradation of PSⅡ - D1 Protein and the inhibition of the endogenous protecting system such as Xanthophyll cycle and the enzymes of scavenging active oxygen. The results suggested that for a view of high-yield breeding, on the basis of a good type-plant, giving consideration to the utilization of heterosis and resistance to early aging, selecting japonica or a sterile line with japonice genotype as maternal was a breeding strategy worthy of being paid more attention.

关键词： Rice Characteristics of chl fluorescence Photoinhibition Photooxidation Early aging

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A Series Piezoelectric Quartz Crystal Response Kinetics for *** Growth in the Presence of Cu(Ⅱ)

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Journal of Central South University 2000年第1期12卷 15-19页

作者： CHAI Li yuan 1,2.,WEI Wan zhi 2.YAO Shou zhuo 2.1. department of Metallurgical Science and Engineering, Central South University of Technology, Changsha 410083, china 2. {2. of chemistry and Chemical Engineering, Hunan University, Changsha 1. department of Metallurgical Science and Engineering Central South University of Technology 410083 Changsha China 2. college of chemistry and Chemical Engineering Hunan University 410082 Changsha China

The kinetics on the growth of *** in the presence of Cu(Ⅱ) was studied using of series piezoelectric quartz crystal (SPQC). Arsenic ion inhibits the growth of *** , which is consistent with the previous results by other measuring methods. This further demonstrates that the SPQC can monitor the chemical activity of *** growth. Cupric ion accelerates the growth of *** . The mechanism was discussed, i. e., copper promotes the protein enzyme of *** , rusticyanin, to form over the range of cupric ion concentration studied. The reaction order of cupric ion in accelerating the bacterial growth is 0.067. The growth of *** is dependent on temperature, the apparent reaction activation energy decreases from 2..56 kJ/mol to 18.32.kJ/mol because of the addition of 10 mg/L Cu(Ⅱ) to the bacterial growth solution of pH 2.0 at initial inoculum of 10%.

关键词： series piezoelectric quartz crystal T.ferrooxidans growth kinetics sigmoid curve cupric ion

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