盐酸煮沸提取原子吸收法测定乳和乳制品中矿质元素

本研究了盐酸煮沸提取乳和乳制品中的Ｋ、Ｎａ、Ｃａ、Ｍｇ、Ｆｅ和Ｚｎ六个矿质元素的实验条件,１ｍｏｌ·Ｌ＾－１盐酸提取液用火焰原子吸收法（ＦＡＡＳ）测定,得到满意的结果。方法具有操作简便,安全,快速的特点。与高温干灰化法对十种样品进行结果对照,无论液体样品或样品,其结果都非常一致,不存在显差异,结果具有很好的准确度和精密度。     

硬质合金CVD金刚石涂层工具衬底前处理技术研究

本研究采用KOH:K3[Fe(CN)6]:H2O和H2SO4:H2O2两种溶液浸蚀硬质合金衬底,分别选择刻蚀WC和Co.并在浸蚀过的硬质合金衬底上,用强电流直流伸展电弧等离子体CVD法沉积金刚石涂层.研究表明,两步混合处理法不仅可以有效的去除硬质合金基体表面的钴,而且,还可显著粗化硬质合金衬底.因此,提高了金刚石薄膜的质量和涂层的附着力.     

丰中子核反应的HBT效应研究

用同位旋相关的量子分子动力学模型模拟了丰中子弹核引起(Be同位素)的核反应的中子-质子动量关联函数(即HBT), 我们发现在小相对动量的中子-质子的HBT敏感于弹核的结合能, 同时质子--晕中子的HBT依赖于核的单中子分离能. 我们还研究了核态方程和介质中核子--核子截面的对HBT的影响.     

粒子场同轴全息记录装置的通光孔径对信息量的影响

通过分析粒子场同轴全息记录装置通光孔径对粒子信息通过量的影响，对不同大小、形状的粒子在相同距离和实验装置下的信息通过量进行数值模拟，并进行实验说明，得到了小粒子信息基本通过时对装置通光孔径的参数要求，有助于爆轰实验装置参数的设计。     

Compact Arrayed-Waveguide Grating on Silicon-on-Insulator with Integrated Waveguide Turning Mirrors

A compact arrayed-waveguide grating （AWG） on the silicon-on-insulator material is designed and fabricated with employment of waveguide-integrated turning mirrors （WITMs）. By properly setting the incident angle with the value of 45°, the effective area of the WITM AWG is only 1.15 cm×1.15 cm with the arrayed waveguide area of 0.6cm×0.6cm. The crosstalk of the fabricated 1×6 AWG is better than -19 dB. The on-chip insertion loss is about -8.8 dB and the output nonuniformity is less than 0.6 dB. The polarization-dependent central wavelength shift is about 0.048nm and the polarization dependent loss is neglectable.     

Two-Dimensional Photovoltaic Dark Spatial Solitons of Partially Spatially Incoherent Light

We report a successful experimental observation of two-dimensional photovoltaic dark solitons in an anisotropic crystal with partially spatially incoherent light beams. This kind of solitons results from the bulk photovoltaic effect， which depends on the direction of propagation of the optical beam and on the orientation of the intensity gradient, with respect to the principal axes of the crystal     

Low-amplitude vector screening solitons

We show self-coupled and cross-coupled vector beam evolution equations in the low-amplitude regime for screening solitons,which can exhibit the analytical solutions of bright-bright and dark-dark vector solitons.Our analysis indicates that these self-coupled vector solitons are obtained irrespective of the intensities of the two optical beams,whereas these cross-coupled vector solitons can be established when the intensities of the two optical beams are equal.Relevant examples are provided where the photorefractive crystal is lithium niobate(LiNbO3).The stability properties of these vector solitons have been investigated numerically and it has been found that they are stable.     

食用花卉中Fe含量及其形态分析

采用SpectroAA 1 0 (Varian)原子吸收分光光度计对食用花卉中Fe含量进行了分析 ,结果表明 ,花卉中Fe含量较高。并对菊花、芙蓉花、金银花中七种形态进行了测定 ,得出了微量元素Fe的提取率、残留率和浸留比等形态分析参数 ,结果表明 ,三种花卉中Fe总提取率 ,浸留比几种参数均较接近 ,说明花卉中Fe结合形式比较类似。三种花卉中的Fe头煎提取率均比二煎提取率高 ,头煎浸留比均比二煎浸留比高 ,但三种花卉中Fe的提取均未超过总量的一半 ,说明食用花卉中Fe不易被水溶解出来 ,可溶性态较少 ,多为不溶性有机态。回收实验结果表明 ,方法的回收率在 96 5 %～ 1 0 3 2 %之间 ,RSD在 1 2 %～ 3 1 %之间 ,表明方法可行。