检索结果-南通市图书馆

Chinese Journal of Structural Chemistry 2006年第10期25卷 1213-1216页

作者： zhang chun-hua CHEN Man-Sheng KUANG Dai-Zhi Department of Chemistry and Materials Science Hengyang Normal University Hengyang 421008 China

A novel manganese coordination polymer [Mn（L）2（bipy）]n （HL = 3,5-dimethylbenzoic acid, 4,4＇-bipy = 4,4＇-bipyridine） has been synthesized by a hydrothermal method. The molecular and crystal structures were determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group C2/c with a = 2.0996（8）, b = 1,1835（5）, c = 0.9958（4） nm, β = 110.161（5）°, V = 2,3229（16） nm^3, Z = 4, C28H26MnN2O4, Mr = 509.45, Dc= 1.457 g/cm^3,μ = 0.607 mm^-1, F（000） = 1060, Rim = 0.0566, R = 0.0334 and wR = 0.1078. In the crystal the manganese atom is six-coordinated by two nitrogen atoms from 4,4＇-bipy and four oxygen atoms from 3,5-dimethylbenzolate molecules, completing an octahedral geometry. The 4,4＇-bipy molecules bridge the infinite chain [Mn（L）2（bipy）]n to form a two-dimensional layer.

关键词： manganese coordination polymer hydrothermal synthesis crystal structure

Electrochemical Cycled Structure of MnV_2O_6 Nanoribbons Synthesized via Hydrothermal Route

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2011年第3期27卷 528-530页

作者： HU Fang zhang chun-hua zhang Song MING Xing CHEN Gang WEI Ving-jin WANG chun-zhong School of Materials Science and Engineering Shenyang University of Technology Shenyang 110870 P. R. China＂ College of Physics and State Key Laboratory of Superhard Materials Jilin University Changchun 130012 P. R. Chin~ Sollege of Physical Science and Technology Huanggang Normal University Huanggang 438000 P. R. China

1 Introduction Low-dimensional nanostructures, such as nanorods, nanowires, and nanotubes, have received much attention for their superior optical, electrical, catalytic and magnetic properties. Owing to their low dimensionality and quantum continement effect, low-dimensional nanoscale materials can be exploited as fundamental building blocks for nanoscience and nanodevices^[1-3]. In recent years, efforts have been devoted to develop new approaches to synthesize one-dimensional（lD） nanostructrued vanadium oxides or vanadates materials, such as V205, NaV2Os, and CuV206, which have been widely investigated in catalytic or electrochemical fields due to their outstanding structural flexibility^[4-6].

关键词： MnV2O6 Hydrothermal route Electrochemical property Cycled structure

Response of Glutathione and Glutathione S-transferase in Rice Seedlings Exposed to Cadmium Stress

在线全文

学校读者我要写书评

暂无评论

Rice science 2008年第1期15卷 73-76页

作者： zhang chun-hua GE Ying Demonstration Laboratory of Molecular Biological Techniques Laboratory Center of Life Science College of Life ScienceNanjing Agricultural University Nanjing 210095 China College of Resources and Environmental Sciences Nanjing AgriculturalUniversity Nanjing 210095 China

A hydroponic culture experiment was done to investigate the effect of Cd stress on glutathione content （GSH） and glutathione S-transferase （GST, EC 2.5.1,18） activity in rice seedlings. The rice growth was severely inhibited when Cd level in the solution was higher than 10 mg/L. In rice shoots, GSH content and GST activity increased with the increasing Cd level, while in roots, GST was obviously inhibited by Cd treatments, Compared with shoots, the rice roots had higher GSH content and GST activity, indicating the ability of Cd detoxification was much higher in roots than in shoots. There was a significant correlation between Cd level and GSH content or GST activity, suggesting that both parameters may be used as biomarkers of Cd stress in rice.

关键词： rice cadmium stress glutathione glutathione S-transferase enzyme activity

Classification of underwater still objects based on multi-field features and SVM

在线全文

学校读者我要写书评

暂无评论

Journal of Marine Science and Application 2007年第1期6卷 36-40页

作者： TIAN Jie XUE Shan-hua huaNG Hai-ning zhang chun-hua Institute of Acoustics Chinese Academy of Sciences Beijing 100080 China

A Support Vector Machine is used as a classifier to the automatic detection and recognition of underwater still objects. Discrimination between the objects can be transferred into different projection spaces by the process of multi-field feature extraction. The multi-field feature vector includes time-domain, spectral, time-frequency distribution and bi-spectral features. Underwater target recognition can be considered as a problem of small sample recognition. SVM algorithm is appropriate to this kind of problems because of its outstanding generalizability. The SVM is contrasted with a Gaussian classifier and a k-nearest classifier in some experiments using real data of lake or sea trial. The experimental results indicate that SVM is better than the others two.

关键词： underwater still objects classification feature support vector machine (SVM)

Structure and Thermal Stability of a One-dimensional Chain Cobalt Coordination Polymer [Co(phen)(2,4,6-TMBA)_2(H_2O)]_n

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第6期25卷 752-756页

作者： YANG Ying-Qun LI Chang-Hong LI Wei zhang chun-hua GUO Dong-Cai KANG Yun-Fei Department of Chemistry and Materials Science Hengyang Normal University Hengyang 421008 China College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China Department of Chemical Engineering Hunan Institute of Technology Hengyang 421008 China

A one-dimensional chain cobalt（Ⅱ） coordination polymer with 2,4,6-trimethylbenzoic acid, 1,10-phenanthroline and cobalt perchlorate anhydrous has been synthesized in the solvent mixture of water/methanol and characterized. Crystal data for this complex： tetragonal, space group I41, a = 2.0356（2）, c = 1.3779（3） nm, V= 5.7096（15） nm^3, Mr= 581.51,μ（MoKa） = 0.644, Dc = 1.353 g/cm^3, Z = 8, F（000） = 2424, final S = 1.005, R = 0.0404 and wR = 0.0865. The crystal structure shows that the cobalt ion is coordinated with two nitrogen atoms of one 1,10-phenanthroline molecule, three oxygen atoms from three 2,4,6-trimethylbenzoic acid molecules and one water molecule, giving a distorted octahedral coordination geometry. The result of TG analysis indicates that the title complex is stable till 200 ℃.

关键词： cobalt(Ⅱ) complex crystal structure thermal stability analysis

Synthesis and Crystal Structure of a Hexameric Organooxotin Cluster from Benzilic Acid

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2005年第11期24卷 1249-1253页

作者： CHEN Man-Sheng KUANG Dai-Zhi zhang chun-hua DENG Yi-Fang LI Wei YANG Ying-Qun Department of Chemistry and Material Science Hengyang Normal University Hengyang 421008 China

The title complex [^n BuSn（O）O2C（OH）CPh2]6.2H2O has been synthesized by the reaction of n-BuSn（O）OH with benzilic acid in 1：1 molar radio and characterized by IR, ^1H NMR spectra and elemental analysis. The crystal structure was determined by X-ray diffraction. It crystallizes in triclinic, space group PI with a = 1.3543（2）, b = 1.4593（2）, c = 1.5293（2） nm, α = 102.075 （2）,β = 115.571 （2）, γ = 93.308（3）°, Z = 1, V = 2.6282（7） nm^3, Mr = 2550.21, Dc = 1.611 g/cm^3,μ = 1.477 mm^-1, F（000） = 1280, R = 0.0309 and wR = 0.0729. The structure shows a distorted octahedral configuration with six-coordination for the central tin atom.

关键词： organooxotin cluster benzilic acid crystal structure synthesis organooxotin cluster benzilic acid crystal structure synthesis

Purification and Identification of Glutathione S-transferase in Rice Root under Cadmium Stress

在线全文

学校读者我要写书评

暂无评论

Rice science 2013年第3期20卷 173-178页

作者： zhang chun-hua WU Ze-ying JU Ting GE Ying Demonstration Laboratory of Proteomic Research Laboratory Centre of Life ScienceCollege of Life ScienceNanjing Agricultural University State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of Sciences College of Resources and Environmental Sciences Nanjing Agricultural University

Cadmium （Cd） contamination in paddy soils poses a serious threat to the production and quality of rice. Among various biochemical processes related to Cd detoxification in rice, glutathione S-transferase （GST） plays an important role, catalyzing Cd complexation with glutathione （GSH） and scavenging reactive oxygen species （ROS） in cells. In this study, a hydroponic experiment was conducted to investigate the response of GST isozymes in rice roots upon Cd exposure. Results showed that the GST activity in rice roots was clearly enhanced by 50 pmol/L Cd treatment for 7 d. The GST isozymes were purified by ammonium sulphate precipitation, gel filtration chromatography and affinity chromatography. After being separated by SDS-PAGE and visualized by silver staining, GSTU6 was identified by in-gel digestion, MALDI-TOF-MS analysis and peptide mass fingerprint. The results confirm the vital function of tau class rice GST in Cd detoxification.

关键词： rice glutathione S-transferase cadmium stress purification identification isozyme

Synthesis and Crystal Structure of a Novel Manganese Coordination Polymer: 2,5-Bis(4-pyridyl)-3,4-diaza-2,4-hexadiene

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2007年第2期26卷 219-223页

作者： CHEN Man-Sheng DENG Yi-Fang zhang chun-hua KUANG Dai-Zhi FENG Yong-Lan PENG Yun-Lin Department of Chemistry and Materials Science Hen gyan g Normal University Hen gyan g 421008 China

A new manganese coordination polymer 1, [Mn（H2O）4（L）]n（ClO4）2n.2nH2O.3nL （L = 2,5-bis（4-pyridyl）-3,4-diaza-2,4-hexadiene）, has been synthesized and structurally characterized. The crystal structure was determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group Pn with a = 13.9176（8）, b = 15.4754（9）, c = 15.9670（9） A, β = 99.5010（10）°, V = 3391.8（3） ]k3, Z = 2, C56H68C12MnN16O14, Mr= 1315.10, Dc = 1.288 g/cm^3,μ = 0.344 mm^-1, F（000） = 1374, R = 0.0733 and wR = 0.2035. In the crystal the manganese atom is six-coordinated by two nitrogen atoms from 2,5-bis（4-pyridyl）-3,4-diaza-2,4-hexadiene and four oxygen atoms from water molecules, completing an octahedral geometry. The title complex exhibits a novel supramolecular layer architecture sustained by the concurrence of coordination bonds, hydrogen bonds, and π-π stacking interactions.

关键词： manganese complex Schiff bases crystal structure

镜像视频示范训练对脑卒中后执行功能障碍的效果

在线全文

学校读者我要写书评

暂无评论

中国康复理论与实践 2016年第1期22卷 79-83页

作者：张春华顾莹刘敏山东省交通医院康复科山东济南市250031

目的探讨基于镜像神经元理论指导的视频示范训练对脑卒中后执行功能障碍患者的效果。方法 2014年7月~2015年7月40例住院脑卒中后执行功能障碍患者分为对照组（n=20）和观察组（n=20）。对照组予常规执行功能康复训练,观察组先看相应训... 详细信息

目的探讨基于镜像神经元理论指导的视频示范训练对脑卒中后执行功能障碍患者的效果。方法 2014年7月~2015年7月40例住院脑卒中后执行功能障碍患者分为对照组（n=20）和观察组（n=20）。对照组予常规执行功能康复训练,观察组先看相应训练动作的示范视频,再进行训练。治疗前后两组采用执行功能缺陷综合征行为学评价（BADS）进行评定。结果治疗后,观察组除规则转换卡片测验、找钥匙测验外,其余各分项评分及测验总分均较对照组提高（t〉2.9,P〈0.05）。结论基于镜像神经元理论的镜像视频示范训练对脑卒中执行功能障碍患者有效。

关键词：脑卒中执行功能障碍镜像神经元理论镜像视频示范训练

Fuzzy Adaptive Control of Stochastic Nonlinear Systems with Unknown Virtual Control Gain Function

在线全文

学校读者我要写书评

暂无评论

自动化学报 2006年第2期32卷 170-178页

作者： WANG Ying-chun zhang hua-Guang WANG Yi-Zhong Institute of Electrical Automation Northeastern University Shenyang 110004

The problem of track control is studied for a class of strict-feedback stochastic nonlinear systems in which unknown virtual control gain function is the main feature. First, the so-called stochastic LaSalle theory is extended to some extent, and accordingly, the results of global ultimate boundedness for stochastic nonlinear systems are developed. Next, a new design scheme of fuzzy adaptive control is proposed. The advantage of it is that it does not require priori knowledge of virtual control gain function sign, which is usually demanded in many designs. At the same time, the track performance of closed-loop systems is improved by adaptive modifying the estimated error upper bound. By theoretical analysis, the signals of closed-loop systems are globally ultimately bounded in probability and the track error converges to a small residual set around the origin in 4th-power expectation.

关键词：随机非线性系统模糊自适应控制虚拟控制增益函数