Bis-imidazoline was prepared from triethylene tetraamine and N,N-dimethylformamide dimethyl acetal at 85℃ for 2 h with toluene as solvent, with a yield of 90.4%. The reaction of bis-imidazoline with 1,2-dibromoethane and potassium carbonate in acetonitrile provided with a monobromide salt yield of 78.7%. Hydrolysis of monobromide salt under aqueous causic solution formed 1,4,7,10-tetraazzcyclododecane in a 74.2% yield.

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Films of carbon nanofibers have been grown on the block-type CNTs substrate impregnated with an aqueous nickelous nitrate solution as catalyst precursor.

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Physicochemical Properties of Amino Acids in Aqueous Caffeine Solution at 25, 30, 35 and 40

[1]中山大學(xué)物理學(xué)系日韩精品一区二区免费暖暖，廣東廣州510275 [2]廣東工業(yè)大學(xué)材料科學(xué)系激情狠狠文学网，廣東廣州510090

The results show that the inhibitor adsorbs on the surface of carbon steel while it does not adsorb on the surface of stainless steel in aqueous NaCl solution.

結(jié)果表明，在NaCl水溶液中自拍偷拍29p，緩蝕劑只吸附在碳鋼表面性爱免费视频，而不吸附在不銹鋼表面；當(dāng)碳鋼與不銹鋼耦合后亚洲视频色网站，緩蝕劑在偶對(duì)的陰極和陽極都有吸附家庭乱伦小说亚洲色图。

The high viscosity of polymer solution can improve the mobility ratio between oil phase and aqueous phase. Therefore, it can expand sweep efficiency of displacing fluid. In the model of multi-polymer commixing flooding mechanism, each polymer flows in the porous media on its own ability, and the enhanced oil recovery process is resulted from the total concentration of all the polymers.

在多種分子量聚合物溶液混合驅(qū)油機(jī)理數(shù)學(xué)模型中，每一種分子量聚合物在油藏中流動(dòng)滿足各自獨(dú)立的物質(zhì)傳輸規(guī)律国产小视频激情，在驅(qū)油機(jī)理上表現(xiàn)為多種分子量聚合物溶液濃度之和的總濃度總體驅(qū)油過程华人在线免费，驅(qū)油機(jī)理數(shù)學(xué)模型中的參數(shù)表示為各種分子量聚合物相應(yīng)參數(shù)濃度加權(quán)平均的形式。

Dielectric measurements were carried out for polystyrene/polypyrrole composite membranes immersed in dilute aqueous electrolyte solution over a frequency range from 40 Hz to 11 MHz, some differential dielectric relaxation phenomena were observed: pure PS membrane and the PS membrane interfused with PPy showed different modes of dielectric spectra, one relaxation for pure PS membrane and two relaxations for the PS membrane interfused with PPy, respectively.

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The dynamical processes of the nucleation and propagation of stress corrosion cracking of four low alloy steels with a wide range of tensile strengths in aqueous media with various polarization conditions, in a K_2Cr_2O_7 inhibitor solution and in some organic solvent such as acetone and alcohol were traced with an optical microscope.

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Methods Anhydrous acetic acid as solvent, 0.1 mol/L perchloric acid as titrant, crystal violet solution as indicator to establish non-aqueous titrations and ODS column as stationary phase, methanol and a mixture of 0.025 mol/L sodium phosphate monobasic and 0.02 mol/L sodium dedecyl sulfate (80:20) adjusted with phosphoric acid to a pH (4.8±0.1J as mobile phase, 220 nm as detective wavelength to establish HPLC-UV method for determination of piperazinylethylestrone drug substance; FMOC-CL as a derivatization reagent, FD as a detector to establish an HPLC method with derivatization and column switching for determination of piperazinylethylestrone in dog plasma.

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Usually, the pigment is extracted by acid aqueous or alcohol solution and purified by different kinds of resins.

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The alkylation of a-methylene of PhSO2CH2COPh with alkyl halides catalyzed by quaternary ammonium base resin in 50% aqueous sodium hydroxide solution was investigated.

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