Chaos generalized synchronization of an inertial tachometer with new Mathieu-Van der Pol systems as functional system by GYC partial region stability theory

A new strategy to achieve generalized chaos synchronization by GYC partial region stability theory is proposed. By using the GYC partial region stability theory the Lyapunov function is a simple linear homogeneous function of error states and the controllers are more simple and introduce less simulation error because they are in lower order than that of traditional controllers. In simulation examples, an inertial tachometer system and Mathieu-Van der Pol system are used.     

关于一维Moran集Hausdorff维数的一个新证明和 一个新结果

利用分形儿何中的技巧给出了关于一维Moran集Hausdorff维数的一个新证明和一个新结果,这可看做是对原有结果的一个有益补充.     

新型存贮器FLASH在保密通信中的应用

本文介绍了近年来在国际上出现的新型存贮器——FLASH,给出了FLASH存贮器的一些具体使用方法,旨在推动FLASH存贮器在保密通信中的应用。     

On the density of primitive sets

Classical results by Behrend, Erdös, Pillai, Szemerédi, the authors, and others are improved and extended to other concepts of densities in two directions, based on smooth and multiplicative weightings.     

Comparison of chelating agents immobilized on glass with chelex 100 for removal and preconcentration of trace copper(II)

Three types of chelating agents immobilized on glass were compared with Chelex 100 for removing and preconcentrating trace Cu(2+) from laboratory-prepared solutions. Columns of immobilized N-propylethylenediamine (diamine), its bis(dithiocarbamate) (DTC) and immobilized 8-hydroxyquinoline (8-HQ) quantitatively remove Cu(2+) (10-200 mug l. ) from buffered solutions at pH 6.00. Addition of isolated natural organic matter at concentrations typical of organic-rich fresh waters (25-100 mug l. ) complexed Cu(2+) and hindered the performance of Chelex and the immobilized chelating agents. In the presence of organic matter the DTC performed very well, removing about 98% of the Cu(2+). However, the Cu(2+) removed could not be readily recovered from the column. Chelex gave the poorest results, removing only 62 and 75% of Cu(2+) at the two levels tested. The other immobilized reagents gave results that were strongly dependent on their contact time with the solution. Longer columns and slower flow-rates tended to improve results. Overall, the immobilized 8-HQ is probably the most suitable of the materials tested for preconcentration work. A batch titration of 8-HQ with Cu(2+) monitored by ion-selective electrode indicated a conditional stability constant of 6.2 x 10(7), which is larger than the corresponding value for the complex with non-immobilized 8-hydroxyquinoline, measured under the same conditions.     

Algebra for fermions with a new exclusion principle

We construct the algebra of the creation and destruction operators for spin 1/2 particles obeying a new exclusion principle which is “more exclusive” than Pauli’s exclusion principle: an orbital state shall not contain more than one particle, whether spin up or spin down. The consequences of this algebra are studied and applications to the Hubbard model in condensed matter physics are indicated. An erratum to this article is available at .     

Preparation and gas chromatographic characterisation of 3-bromo-4-(4-methylbenzyloxy)azobenzene stationary phase

Summary The synthesis of 3-bromo-4-(4-methylbenzyloxy)azobenzene (BMBOA) and its use as a stationary phase in packed columns are described. Chromatographic characteristics such as column efficiency, polarity (McReynolds constants) and operating temperature range were studied. Retention factors, specific retention volumes and activity coefficients for alcohols, esters, ketones, aromatic hydrocarbons andn-alkanes were determined. Phenols and 2,3, and 4-chlorobenzyl chlorides were separated on the new phase. Based on experimental data some assumptions were made on the possible types of intermolecular forces between solute and solvent.