检索结果-南通市图书馆

Modified Wave Particle Duality and Black Hole Physics

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第7期48卷 93-98页

作者： LI Xiang Department of Physics,nanchang university,nanchang 330047,china Department of Physics Nanchang University Nanchang 330047 China

de Broglie relation is revisited,in consideration of a generalization of canonical commuting *** effects on particle's localization and black hole physics are also discussed,in a heuristic manner.

关键词： wave-particle duality dispersion relation localization limit black hole entropy

Optimized third-order force-gradient symplectic algorithms

在线全文

学校读者我要写书评

暂无评论

science china(Physics,Mechanics & Astronomy) 2010年第9期53卷 1600-1609页

作者： LI Rong & WU Xin school of science,nanchang university,nanchang 330031,china school of science Nanchang University Nanchang China

With the natural splitting of a Hamiltonian system into kinetic energy and potential energy,we construct two new optimal thirdorder force-gradient symplectic algorithms in each of which the norm of fourth-order truncation errors is *** are both not explicitly superior to their no-optimal counterparts in the numerical stability and the topology structure-preserving,but they are in the accuracy of energy on classical problems and in one of the energy eigenvalues for one-dimensional time-independent Schrdinger *** particular,they are much better than the optimal third-order non-gradient symplectic *** also have an advantage over the fourth-order non-gradient symplectic integrator.

关键词： symplectic integrators symplectic scheme-shooting method celestial mechanics time-independent Schrdinger equation energy eigenvalues numerical stability bisection method topological structure

青钱柳对四氧嘧啶糖尿病小鼠降血糖作用的研究

在线全文

学校读者我要写书评

暂无评论

天然产物研究与开发 2001年第3期13卷 52-54,57页

作者：易醒谢明勇温辉梁邓泽元南昌大学生命科学与食品工程学院南昌330047

目的 :研究我国特有植物保健食品青钱柳对实验性糖尿病小鼠的降糖作用。方法 :选用昆明种小鼠尾 iv四氧嘧啶 ,选择性破坏胰岛 β细胞 ,造成小鼠实验性糖尿病模型 ;尔后用青钱柳提取物给该小鼠灌胃 ,测定其空腹血糖 ,观察小鼠血糖及体重... 详细信息

目的 :研究我国特有植物保健食品青钱柳对实验性糖尿病小鼠的降糖作用。方法 :选用昆明种小鼠尾 iv四氧嘧啶 ,选择性破坏胰岛 β细胞 ,造成小鼠实验性糖尿病模型 ;尔后用青钱柳提取物给该小鼠灌胃 ,测定其空腹血糖 ,观察小鼠血糖及体重变化 ,最后进行糖耐量实验。结果 :给小鼠饲喂试验样品4周后 ,服用青钱柳 70 %醇提取物及糖复合物的 2组小鼠空腹血糖均明显低于模型对照组 (P<0 .0 5 ) ;同时 ,糖耐量明显增加且对小鼠体重增长无影响。结论 :青钱柳对试验性小鼠具有显著的降血糖作用。作为天然保健食品开发具有广阔的前景。

关键词：青钱柳提取物糖尿病小鼠降血糖作用

Synthesis and spectroscopic characterization of fluorescent solid rare-earth complexes with hydroxamic acids

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2002年第3期21卷 163-169页

作者： LI Yangsheng and LI FanFaculty of Chemistry and Materials science, nanchang university, nanchang 200437, china Faculty of Chemistry and Materials science Nanchang University Nanchang 330047

The complexes RE_2(DHYA)_3 centre dot nH_2O in the title bar were synthesizedthrough some reactions of trivalent rare-earth ions. In the process of synthesis, dihydroxamicacids were taken as ligands while the alcohol was taken as a solvent. The ligands includedadipylhydroxamic acid (ADHA), p-phthalichydroxamic acid (PPHA), oxalohydroxamic acid (OXHA),butadihydroxamic acid (BDHA), o-phthalichydroxamic acid (OPHA), benzoylhydroxamic acid (BHA), *** at 25 deg C, the molar conductances in various modes are 13.00-21.05 S centre dot cm^2centre dot mol^(-1), which shows that rare-earth complexes are nonelectrolytes and the hydroxaminogroups of the complexes have taken part in bonding. Infrared spectra, ultraviolet spectra, nuclearmagnetic resonance (~1HNMR) spectra, and fluorescence spectra were used to investigate thecomplexes. Experiments have proved that the complexes of En^(3+)and Tb^(3+) with aromatic hydroxamicacids have good fluorescent characteristics.

关键词： hydroxamic acid complex rare earth

Preparation of Nano-Sized TiO2 Particles by Microemulsion Method

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第S3期 575-577页

作者： Shaohua Zhang~1 Bing Xie~2 Fengyi Li~3 Peng Xu~2 (1.school of Material science and Engineering,nanchang Univeristy,nanchang 330047,china) (2.Analysis and Test Center,nanchang university,nanchang 330047,china) (3.school of science,nanchang university,nanchang 330047,china)

Nano-sized titania powders have been prepared by hydrolysis of tetrabutyl titanate in the droplet of water/OP-7/pentanol/cyclohexane microemulsion *** effects of ingredient change on the water drop size and particle size were *** prepared TiO2was in the form of anatase after ***2was characterized by TG-TGA, FTIR,XRD to measure the transformation temperature,surface adsorption and average size.

关键词： TiO2 microemulsion nano

A Problem about the Weak Hilbert Property

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 1998年第4期14卷 481-486页

作者： Zeng Guangxing, Departement of Mathematics and Systems science, nanchang university, nanchang 330047, china Department of Mathematics and Systems science Nanchang University 330047 Nanchang China

In this paper, we prove the main result: Let both (K, S) and (K*, S*) be preordered fields, and let (K*, S*) be a finitely generated extension of (K, S). If K* is transcendental over K, then (K*, S*) has the weak Hilbert property. This result answers negatively an open problem posed by the author in reference[1]. Moreover, some results on the weak Hilbert property are established. In this paper, we prove the main result: Let both (K, S) and (K*, S*) be preordered fields, and let (K*, S*) be a finitely generated extension of (K, S). If K* is transcendental over K, then (K*, S*) has the weak Hilbert property. This result answers negatively an open problem posed by the author in reference [1]. Moreover, some results on the weak Hilbert property are established.

关键词： Ordered field Preordered field The weak Hilbert property Positive definite polynomial

Empirical study on entropy models of cellular manufacturing systems

在线全文

学校读者我要写书评

暂无评论

Progress in Natural science:Materials International 2009年第3期19卷 389-395页

作者： Zhifeng Zhang a,b,*, Renbin Xiao a a CAD Center, Huazhong university of science and Technology, Wuhan 430074, china b Economics and Management school of nanchang, Hangkong university, nanchang 330063, china CAD Center Huazhong University of Science and Technology Wuhan 430074 China Economics and Management school of nanchang Hangkong University Nanchang 330063 China

From the theoretical point of view, the states of manufacturing resources can be monitored and assessed through the amount of infor- mation needed to describe their technological structure and operational state. The amount of information needed to describe cellular manufacturing systems is investigated by two measures: the structural entropy and the operational entropy. Based on the Shannon entropy, the models of the structural entropy and the operational entropy of cellular manufacturing systems are developed, and the cog- nizance of the states of manufacturing resources is also illustrated. Scheduling is introduced to measure the entropy models of cellular manufacturing systems, and the feasible concepts of maximum schedule horizon and schedule adherence are advanced to quantitatively evaluate the effectiveness of schedules. Finally, an example is used to demonstrate the validity of the proposed methodology.

关键词： Cellular manufacturing systems Structural entropy Operational entropy Scheduling

Hydrothermal Treatment of Sol-Gel TiO2 Film

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第S3期 570-571页

作者： Shaohua Zhang~1 Bing Xie~2 Fengyi Li~3 Tude Zou~2 (1.school of Materials,nanchang university,Jiangxi 330047,china) (2.Center of Analysis and Test,nanchang university,Jiangxi 330047,china) (3.school of science,nanchang university,Jiangxi 330047,china)

The preparation of TiO2film has been an important research *** our work,we obtained the TiO2film by hydrothermal treating the amorphous film prepared by sol-gel method or the hydrolysis of titanium *** influence of temperature and duration time on the film properties was *** photo degradation of methyl orange in aqueous solution of the film was *** films were characterized by XRD and Uv-Vis spectroscope.

关键词： titania film hydrothermal sol-gel

Low Temperature Direct Synthesis of Strontium Titanate Powder

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第S3期 556-558页

作者： Bing Xie~1 Shaohua Zhang~2 Fengyi Li~3 Yumei Wu~1 (1.Center of Analysis and Testing,nanchang university,Jiangxi 330047,china) (2.school of Materials,nanchang university,Jiangxi 330047,china) (3.school of science,nanchang university,Jiangxi 330047,china)

Low temperature direct synthesis （LTDS） involves the preparation of a base solution of Sr2+,and the mixing of base solution with tetrabutyl titanate *** is an advantageous method because it does not require the complex hydrothermal facilities and it can prevent the agglomeration in calcinations of other liquid *** our work,we adopted LTDS method to prepare the nano strontium titanate powders,and characterize them by XRD,FT-IR and *** influences of preparation temperature and solvents on grain size and lattice parameters were *** results show that preparation temperature can slightly change the lattice parameters of grain,while solvents also play important roles in the preparation.

关键词： SrTiO3 low temperature direct synthesis nano powder