壳聚糖对Zn2+的吸附性能研究

本文用壳聚糖对Ｚｎ＾２＋的吸附条件进行了研究,探讨了脱乙酰度,分子量,粒度大小,溶液的ｐＨ值,温度,Ｚｎ＾２＋起始浓度和不同锌盐等方面对壳聚糖吸附性能的影响。结果表明：壳聚糖对Ｚｎ＾２＋的吸附具有Ｌａｎｇｍｕｉｒ吸附特征,其吸附最佳条件是壳聚糖脱乙酰度为１００％,锌盐为硫酸锌,Ｚｎ＾２＋溶液ｐＨ值为６．０,起始浓度４－５ｍｇ／ｍｌ。     

The Effect of Surface Roughness on Immiscible Displacement Using Pore Scale Simulation

Transport in Porous Media - Pore scale immiscible displacement is crucial in oil industry. The surface roughness of throat is an important factor affecting water–oil interface movement. In...     

Spectral changes of vector Gaussian Schell-model beams passing through an aperture lens

On the basis of the polarization matrix and propagation equation of the cross-spectral density matrix, the spectral changes in the focal plane of vector Gaussian Schell-model (GSM) beams focused by an aperture lens are studied, where the influence of correlation and polarizer on the behavior of the spectral switch is stressed. It is found that the critical position u_c, spectral minimum S_min, and transition height Δ of the spectral switch depend on the auto-correlation but do not depend on the cross-correlation of GSM beams if there is no polarizer. However, in the presence of the polarizer u_c, S_min and Δ depend on both auto- and cross-correlations. The polarizer affects the spectral switch of vector GSM beams, whereas it does not affect the spectral switch of scalar GSM beams.     

多色矢量高斯-谢尔模型光束的焦移和焦开关

从交叉谱密度矩阵的传输公式出发，对多色矢量高斯-谢尔模型（GSM）光束的焦移和焦开关作了详细的研究.插入偏振片之前，多色矢量高斯-谢尔模型（GSM）光束通过硬边光阑透镜分离光学系统后，有焦移，但无焦开关；而插入偏振片之后，会出现焦开关.改变偏振片的旋转角度可以控制焦开关的特性.     

一种合成β-甲酰氟硼吡咯新方法

氟硼吡咯和氮杂氟硼吡咯分别与草酰氯在N,N-二甲基甲酰胺溶液中发生Vilsmeier-Haack反应,生成相应的β-甲酰氟硼吡咯和β-甲酰氮杂氟硼吡咯.该反应分别在室温和50℃搅拌条件下顺利实现,并对氟硼吡咯和氮杂氟硼吡咯两种底物都具有较高产率.此外,该反应具有原料易得、低污染的优点.     

Effect of Non-Kolmogorov Turbulence on the Spreading of Polychromatic Partially Coherent Hermite–Gaussian Array Beams

Based on the extended Huygens–Fresnel principle, we derive an analytical expression for the beam width of polychromatic partially coherent Hermite-Gaussian array (PPCHGA) beams propagating through non-Kolmogorov turbulence and study in detail the effect of bandwidth, array parameters, and non-Kolmogorov turbulence on the beam-width spreading. We show that the beam width of PPCHGA beams increases with increase in the bandwidth, beam number, and relative distance of beam separation. The spreading of polychromatic array beams with increasing generalized exponent parameter is smaller than that of monochromatic array beams under the same conditions. The results are illustrated by numerical examples.     

A new and Facile Method for Synthesis of AZA-Wittig Reagents under Microwave Irradiation

We report a simple and quick synthetic method of some new Aza-Wittig reagents in anhydrous acetonitrile under microwave irradiation. 1-Substituted aryl-4-ethoxycarbonyl-5-[(triphenylphosphoranylidene)amino]-1, 2, 3-triazoles can be obtained within three minutes by microwave irradiation to the mixture of 1-substituted aryl-4-ethoxycarbonyl-5-amino-1,2,3-triazoles, triphenylphosphine, hexachloroethane and triethylamine. The products were characteried by IR, NMR, MS methods and elemental analysis.     

测量玻璃耐磨性的浊度仪

介绍新研制的TM—100浊度仪的测量原理,叙述了浊度仪在双光路系统、光谱校正及电子运算电路方面的特点。透过率测量精度在±1％以内,浊度精度优于±5％。     

Electrokinetic energy conversion of electro-magneto-hydro-dynamic nanofluids through a microannulus under the time-periodic excitation

In this work, the effects of externally applied axial pressure gradients and transverse magnetic fields on the electrokinetic energy conversion(EKEC) efficiency and the streaming potential of nanofluids through a microannulus are studied. The analytical solution for electro-magneto-hydro-dynamic(EMHD) flow is obtained under the condition of the Debye-H¨uckel linearization. Especially, Green's function method is used to obtain the analytical solutions of the velocity field. The result shows that the velocity distribution is characterized by the dimensionless frequency ?, the Hartmann number Ha, the volume fraction of the nanoparticles φ, the geometric radius ratio a, and the wall ζ potential ratio b. Moreover, the effects of three kinds of periodic excitations are compared and discussed. The results also show that the periodic excitation of the square waveform is more effective in increasing the streaming potential and the EKEC efficiency. It is worth noting that adjusting the wall ζ potential ratio and the geometric radius ratio can affect the streaming potential and the EKEC efficiency.