Coordination of Cu(II) and Ni(II) in polymers imprinted so as to optimize amine chelate formation

Molecular imprinting has become an established technique. However, little was done on direct investigation of the sorbents produced. In the present work, en ESR method was used for the investigation of the complex formation processes within the sorbents imprinted with copper(II) and nickel(II). The sorbents were synthesized from a mixture of linear low molecular weight polyethyleneimine oligomers. The composition, structure and distribution of complexes in the resin phase were investigated. The effects of the synthesis conditions, loading degree and water content were examined. The presence of certain copper complexes was found to be a convenient characteristic of the imprinting efficiency. The optimum synthesis conditions for obtaining sorbents imprinted with copper(II) or nickel(II) were identified. The imprinting results in the improvement of the stability of the complexes and the selectivity and working capacity of the sorbents. The imprinted samples are also characterized by a more even distribution of chelating sites. The synthesis conditions and loading by ions allow for the regulation of the ratio between individual complexes and magnetic associates in the resin phase. This is a critical point on the future use of the metal containing imprinted sorbents as catalysts. (C) 2003 Published by Elsevier Science Ltd

Giant phonon anomalies in the pseudo-gap phase of TiOCl

We report infrared and Raman spectroscopy results of the spin-1/2 quantum magnet TiOCl. Giant anomalies are found in the temperature dependence of the phonon spectrum, which hint to unusual coupling of the electronic degrees of freedom to the lattice. These anomalies develop over a broad temperature interval, suggesting the presence of an extended fluctuation regime. This defines a pseudo-gap phase, characterized by a local spin-gap. Below 100 K a dimensionality cross-over leads to a dimerized ground state with a global spin-gap of about 2$\Delta_{spin}\approx$~430 K.Comment: 4 pages, 3 figures, for further information see http://www.peter-lemmens.d

SOCIAL DANCES AS WAY OF DRAWING ATTENTION TO THE PERSPECTIVE OF THE HEALTHY LIFESTYLE

In article need of valeological knowledge for the modern person is proved the possibility of involvement of people to a healthy lifestyle through occupations social dances and social dances as the unique type of physical activity designed not only to promote physical improvement of dancers, but also to satisfy their spiritual needs in communication and positive emotions reveals. The reasons and historical prerequisites of rele-vance and need of dance as opportunities to physical and sincere im-provement are shown. We conducted a study confirming the positive influ-ence of dance classes on the active populationВ статье обоснована необходимость валеологического знания для современного человека. Раскрывается возможность привлечения людей к здоровому образу жизни через занятия социальными танцами и социальные танцы, как уникальный тип физической активности, призванный не только способствовать физическому оздоровлению танцоров, но и удовлетворить их духовные потребности в общении и положительных эмоциях. Показаны причины и исторические предпосылки актуальности и необходимости танца, как средства физического и душевного оздоровления. Нами было проведено исследование, подтверждающее положительное влияние занятий танцами на активное населени

Signatures of Electronic Correlations in Optical Properties of LaFeAsO1−x_{1-x}Fx_x

Spectroscopic ellipsometry is used to determine the dielectric function of the superconducting LaFeAsO$_{0.9}$F$_{0.1}$ ($T_c$ = 27 K) and undoped LaFeAsO polycrystalline samples in the wide range 0.01-6.5 eV at temperatures 10 $\leq T \leq$ 350 K. The free charge carrier response in both samples is heavily damped with the effective carrier density as low as 0.040$\pm$0.005 electrons per unit cell. The spectral weight transfer in the undoped LaFeAsO associated with opening of the pseudogap at about 0.65 eV is restricted at energies below 2 eV. The spectra of superconducting LaFeAsO$_{0.9}$F$_{0.1}$ reveal a significant transfer of the spectral weight to a broad optical band above 4 eV with increasing temperature. Our data may imply that the electronic states near the Fermi surface are strongly renormalized due to electron-phonon and/or electron-electron interactions.Comment: 4 pages, 4 figures, units in Fig.2 adde

Oxidative dehydrogenation of 2,3,5-trimethyl-1,4-hydroquinone in the presence of titanium dioxide hydrogel

Liquid-phase oxidative dehydrogenation of 2,3,5-trimethyl-1,4-hydroquinone in the presence of titanium dioxide hydrogel was studied by a kinetic method. Associative interactions between the substrate, oxidant, and gel were detected by voltammetry and ESR and IR spectroscopy.Russian Foundation for Basic Researc

Formation of metallic magnetic clusters in a Kondo-lattice metal: Evidence from an optical study

Magnetic materials are usually divided into two classes: those with localised magnetic moments, and those with itinerant charge carriers. We present a comprehensive experimental (spectroscopic ellipsomerty) and theoretical study to demonstrate that these two types of magnetism do not only coexist but complement each other in the Kondo-lattice metal, Tb2PdSi3. In this material the itinerant charge carriers interact with large localised magnetic moments of Tb(4f) states, forming complex magnetic lattices at low temperatures, which we associate with self-organisation of magnetic clusters. The formation of magnetic clusters results in low-energy optical spectral weight shifts, which correspond to opening of the pseudogap in the conduction band of the itinerant charge carriers and development of the low- and high-spin intersite electronic transitions. This phenomenon, driven by self-trapping of electrons by magnetic fluctuations, could be common in correlated metals, including besides Kondo-lattice metals, Fe-based and cuprate superconductors.Comment: 30 pages, 6 Figure

The corrosion resistant coating with halloysite nanoparticles

The process of application of coating on metal surfaces is described in this article. The composition with 100 % corrosion preventing substance + 42,5 % acetone + 10 % halloysite was recognized as the most appropriate for coating, and it provides the best corrosion resistance of hydraulic pump details. The impellers of circulation pumps for water delivery in heating system fail after 5 - 6 months because of the galling of work flutes, as water doesn’t pass through the chemical purification. After applying corrosion resistant coating with halloysite the lifetime of impellers increases. The essence of which is dipping the impeller into hydrochloric acid with 24 hour keeping in it, then it is dried in dryer up to 4 hours. The lifetime of this impeller increases 1,8 fold and it was approximately 9 months

Motivation in personnel management of a trading enterprise

Purpose: Investigating the problems of personnel motivation efficiency as one of the most significant factors of the success of an enterprise at the present stage of development of the Russian economy, the authors consider expedient to consider the theory and practice of the personnel motivation system in a commercial enterprise. Design: General scientific (analysis, synthesis, comparison), and special methods of research (economic and statistical, balance sheet, design-calculation and other), document analysis, questioning, and others were used during the study. Findings: The authors revealed that the trading company should focus on the development of a system of motivation in two directions: the improvement of material motivation of staff and the improvement of non-material motivation of staff. Improving the proposed system of staff motivation will allow the company to create a favorable atmosphere in the team, increasing turnover. Practical implications: The obtained results can be used by the head of the enterprise when developing plans to improve the management system and increase investment attractiveness. Originality: This article analyzes the theoretical foundations of motivation in personnel management. Given the organizational and economic characteristics of the trading enterprise, identified the existing system of motivation in the enterprise.peer-reviewe