Papers by Keyword: Aqueous Medium

Abstract: In order to study the impact of prestress and aqueous medium for axial pump flow rotor modal ，in this paper, with a axial flow model test of North Water Diversion Project, the flow of aqueous medium modal distribution of axial flow rotary mechanism was calculated through the coupling APDL command stream in ANSYS WORKBENCH with the basic idea of Fluid-structure interaction，and axial flow changes of impeller modal in aqueous medium and in the air was compared under prestressed case; the load of prestressed modal of the rotation for the entire organization was calculated through the one-way coupling method . The results show that the water medium has a significant decreases to the natural frequency of the impeller, while the impact of the prestress for modal is not obvious.

Abstract: The new process of 1-(3,4-dichloropheny)-3-methyl-pyrazolone-5-one (34DCPMP) synthesis had been discovered, which using 3,4-dichloro phenylhydrazine hydrochloride(DCPH) and ethyl acetoacetate as the raw material , The product was obtained by the route during cyclization in aqueous medium. The structure of products was confirmed by 1HNMR, 13CNMR and IR. The effects of factors on the yield of products were investigated. It was found that the yield of 34DCPMP can reach 98.7% under the optimal reaction condition of n(34DCPH):n(ethyl acetoacetate) with 1:1.1, n(34DCPH):n(Na2SO3) with 1.3:1 at 80°C, and pH 7.5 for 3h. The chromatographic purity can be higher than 98.2%.

Abstract: Dispersion polymerization of acrylamide and acrylic acid was successfully carried out in aqueous salt solutions using anionic polyelectrolytes as stabilizers. The influences of aqueous solution of salt concentration, molecular weight and concentration of the stabilizers on the apparent viscosity and stability of the dispersions, and on the molecular weight of the polymers prepared were investigated. The results showed that stable dispersions could be obtained on condition that salt concentration was between 26%~30%, concentration of stabilizers between 8%~12%, and intrinsic viscosity of stabilizers between 2.977~3.740 dL/g. With salt concentration ranging from 26% to 30%, molecular weight of products increased first and then decreased. Molecular weight of products was hardly changed when concentration of stabilizer was between 8%~12%. When intrinsic viscosity of stabilizer was between 2.977~3.740 dL/g, increase of the molecular weight of stabilizer resulted in a decrease in the molecular weight of the products.

Abstract: ZnS:Mn quantum dots were prepared in the aqueous medium from readily available precursors. The construction, morphology and luminescence properties of the ZnS:Mn quantum dots were evaluated by XRD,TEM and photoluminescence spectra. The blue and orange emission of the ZnS:Mn quantum dots excited by a 532nm picosecond laser were discussed.

Abstract: ZnS:Er quantum dots were prepared in the aqueous medium from readily available precursors. The construction, morphology and luminescence properties of the ZnS:Er quantum dots were evaluated by XRD,TEM and photoluminescence spectra. Furthermore, the 1590 nm emission of the ZnS:Er quantum dots excited by a 785.0 nm NIR laser were discussed.