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Fluosilicic acid,which is the byproduct from phosphate fertilizer factory,reacts with ammonium hydrocarbonate to obtain ammonium fluosilicate,then reacts with ammonium carbonate to form settled SiO 2,after filtration,water washing,drying and calcining,high purity SiO 2 with less than 10×10 -6 metal impurity and less than 10×10 -9 uranium and thorium respectively is made.

由磷肥厂副产氟硅酸同碳铵反应得氟硅酸铵，再和碳铵反应生成SiO2 沉淀，经过滤、水洗、干燥、煅烧得高纯SiO2 ，其金属杂质总含量小于 10× 10 -6，含放射性元素铀和钍各小于 10× 10 -9，通过实验获得了适宜的工艺条件，反应温度 70℃～ 80℃，反应时间 1 5h～ 2 0h ，配料比n(NH4HCO3 )∶n(NH4 2 SiF6 =4 4。

A comparative study of the flux vector splitting techniques and the flux difference technique with different entropy fix formula is presented with regards to their ability to accurately predict the heat transfer rate on the surface of blunt body.

本文采用计算效率较高的标量对角化隐式NND格式，通过求解Navier Stokes方程对影响再入体表面热流计算准确的诸因素进行了综合分析。

Methods Level of delayed-type hypersensitivity, IL-2 of immunized BALB/c mice were determined by footpad swelling,MTT and transfered protective rate of T cells purified by neloy wool were studied with 500LD50 of the bacteria.

方法迟发型变态反应、IL-2分别采用足垫肿胀、MTT法；利用尼龙毛柱纯化免疫的BALB／c小鼠的T淋巴细胞通过尾静脉转移到非免疫小鼠，再用500LD50的STM攻击。

Then, the differential equations are solved by the Fourier expanding and Hankel integral transform method. Integral solutions of soil skeleton displacements and pore pressure as well as the total stresses for poroelastic media are obtained. Furthermore, a systematic study on Lamb's problems in transversely isotropic saturated half-space is performed. Integral solutions for surface radial, vertical and tangentical displacements are obtained both in the case of drained surface and in the case of undrained surface excited by vertical and tangentical harmonic resources respectively. Numerical results show the obvious difference between the model of isotropic saturated poroelastic media and that of transversely isotropic saturated poroelastic media.

其次，基于Biot波动理论，在圆柱坐标系下求解了横观各向同性饱和土的Biot波动方程：通过引入位移函数，在圆柱坐标系下将横观各向同性饱和土的Biot波动方程转化为两个解耦的6阶和2阶控制方程，然后根据方位角的Fourier展开和径向Hankel变换，求解波动方程，得到以土骨架位移和孔隙水压力为基本未知量的积分形式一般解，并用一般解给出了饱和土总应力分量的表达式；再以基本解为基础，系统地研究了横观各向同性饱和半空间体的Lamb问题，考虑表面排水或不排水两种情况后，首次得到横观各向同性饱和半空间体在表面竖向和水平谐振力作用的下径向、竖向和周向位移的解析解。

According to the double-axis experiment and the uniaxial tension experiment, shear relaxation modulus and bulk relaxation modulus are obtained. Fractional exponent models[23][24][25] are applied to shear relaxation modulus and bulk relaxation modulus. The theory is proved by constant amplitude cyclic strain experiment. Better results are obtained from the comparison of theory curves and experiment results.

通过双轴拉压实验来确定材料的切变松弛模量，单轴拉伸实验来确定材料的体变松弛模量，对这两种模量均采用分数阶指数的形式来进行拟合，再用等应变幅循环历史的实验验证了理论，得到了较好的结果。

The metallographic change and the distribution of alloy elements after the tube has run in the high temperature condition for longtime is more believable and franker to evaluate the tubes remain life time.

然后，通过试验研究了过热器和再热器管12Cr2MoWVTiB钢材的金相组织、合金元素对管道寿命的影响，分析了管材在高温长期运行后金相组织和合金元素分布的变化情况，对管材寿命进行定性评估。

The city by the bay of Northern California, near which the Pacific Ocean resides; the year is 1967Mid October seemed like some spring day,When through the poised waters, dry as lead, The ferry, like vague shadows that stand the dead,Slipped down the curved coast of Frisco bay,Rounded the Golden Gate,-and San Francisco lay,Before me, that gay city, pink and red,Hippies covered Haigh Asbury's homeless head,-My home, to be, I found stirring and grey.

旧金山市的北加州，附近的太平洋居住；今年是1967年10月中旬好像有些春日，当通过蓄势水域，由于干旱导致渡船像模糊的影子，站在死去的人，下滑弧形海岸弗里斯科湾四舍五入金门，及旧金山外，前我认为，同性恋的城市，粉红和红，嬉皮盖haigh金德的无家可归头--我的家，，我发现搅拌grey.the浪打掉就木边；fishermennearby长脖子，闯出了再投。

The zero detect signalresets the 280 which immediately gets the delay signalfrom the DAS via an A/D converter. The 280 then waitsfor this delay and outputs a pulse to the firing pulse amplifierwhich fires the thyristors of the full-wave rectifier

这个零探测信号把Z80复位，它立即通过模拟数字转换器而从DAS得到延迟信号。Z80然后等待这个延迟并且发出一个脉冲来激活放大器，再激活全波调制晶闸管

This article describes reuse-based functional block design flow through developing the header error control processing block set.

本文通过异步传递方式中信头差错控制模块组的设计，阐明基于设计再利用的功能模块的设计流程。

The functional space of the underground urban complex has been making a great emphasis on the intensive construction and sustainable development of the city.

当城市的集约化发展达到一定的高度时，原有的城市空间将难以容纳迅速增加的城市人口和城市功能，从而引发多种城市矛盾。这就必须通过城市再开发加以缓解。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新