前后的

In the underground repositories,the microstructure change of surrounding rock under the action of the chemical corrosion will cause the increase of porosity in medium and the accelerative diffusion of chemical contaminator.

利用SEM电镜扫描技术和X衍射晶体鉴定技术，对经0.01 mol/L，pH值为12的NaOH溶液作用前后的φ50 mm×100 mm大小砂岩试件的表面和矿物成分进行分析，探讨砂岩试件腐蚀表面的微区形貌和矿物组成的变化特征。

A series of liquid laundry detergents with high efficient detergency were formulated by choosing appropriate anionic surfactants and nonionic surfactants.

以提高洗衣液的去污力为目标，通过调整阴离子表面活性剂和非离子表面活性剂之间的比例，设计配制了一系列的洗衣液样品，分别测定各种配方20℃时洗涤国标污布前后的表面反射率，从而得到相应的去污比。

Methods: Improved hyoid suspension in association with UPPP was performed in 22 patients with severe OSAHS. The gap of glossopharyngeum level and polysomnogram were examined pre- and post-operatively in 17 patients.

对22例符合重症阻塞性睡眠呼吸暂停低通气综合征标准的患者进行了改良的舌骨悬吊联合腭咽成型手术，并对所有的患者进行了随访，对17例患者进行了手术前后的舌咽平面间隙的测量和睡眠呼吸监测。

But this kind of invasion cannot avoid the detection of IDS using the protocol analysis technology.(2) In the invasion activities of hackers using TCP, the actions about scanning and Denial of Service utilizing the three-handshake protocol are general. The characteristics of the actions are dynamic for its lie on a series of packets from beginning to end. So the IDS using the traditional pattern match technology cannot detect these actions effectively, but the IDS using the protocol analysis technology can do its.

2在利用TCP协议进行的黑客活动中，比较常用的是利用三次握手过程进行扫描行为和拒绝服务攻击，这类攻击的特征必须根据前后的一系列数据包才能确定，因此攻击特征具有动态性，很不适合于采用模式匹配作为信息检测技术的IDS，但协议分析技术可较为迅速地检测出这类攻击。

Just pay attention to that the gains for plus and minus signals are the same, and the area of the signal around zero. I checked the LM35, the accuracy is good, but does it need 2 diodes in series to measure the temperature lower than -20 degree C? You could consider TC1047A that I used before, it doesn't need any other component, and it can go directly to A/D.

我用4051是想将AD620的＋/-输出信号不通过绝对值电路，而是接一个反相电路，反相前后的信号通过4051和极性判断电路有选择的将信号的绝对值电压再送入AD，用这个方法也能处理温度传感器LM35的输出信号，我想这是个比较安全的方法了吧！

Experiment in this paper validates the convergence of the improved Mean Shift algorithm, contrast convergence rate of improved Mean Shift algorithm with convergence rate of traditional Mean Shift algorithm.

本文的实验也进一步验证了改进的Mean Shift算法的收敛性，并对比了改进前后的Mean Shift算法的收敛速度。

It is because the spending of area and power of the SRAM memory cell takes a lot of percentage of the whole macro modules'. Using the α exponent MOSFET model to result the word line、bit line power model and delay model, together with the area model and analysis of the read/write reliability, we bring out a method to optimize the memory cell and evaluate the performance of the result.

特别对占模块面积和功耗绝大部分比例的SRAM存储单元做了细致的设计和仿真实验，通过采用α指数MOSFET模型推导出SRAM的字线、位线功耗模型和延迟模型，并配合存储单元的面积模型和读写可靠性分析，提出了一种优化存储体单元结构的方法，并对优化前后的性能进行了评估。

Using the properties of base solution vectors of the linear restriction equations, a condition to maintain the same discriminant result between the sampled observations of changed and unchanged was obtained: the disturbed row vector of sampled observations was satisfied all linear equations whose coefficients were the base solution vectors of linear restriction equations.

利用约束条件方程组基础解向量的性质得出了使数据变化前后的判别分类结果保持不变的条件：数据扰动行向量必须满足所有以约束条件方程组的基础解向量为系数的线性方程组。

On the basis of scaleless transform of DEM data, this paper introduces a method of extracting stream network after the generalization, and the fractal transformation of square root model, which is the same with the quantity-fixed generalization model of the stream networks.

本文在DEM数据无级变换的基础上，从DEM中提取出综合前后的河网，并引入分形扩展的方根模型，得到适用于河网的定量综合模型，从而评估出变换后DEM的比例尺。

Chapter 7 A Fused Silica PLOT Column Prepared with Nanotube Titanic Acid Adsorbent and the Influence of Treatment on Its Behavior In the chapter, the nanotubed titanic acid H〓Ti〓O〓(OH 〓 was synthesized in our laboratory, morphology and structure of nanotubed titanic acid was investigated, a fused silica PLOT column was prepared with used that as a new kind of stationary phase in gas-solid adsorption chromatography.

第七章 钛酸纳米管PLOT石英毛细管色谱柱的制备及热处理对色谱保留性能影响研究在实验室合成了具有较大比表面积和纳米管特性的钛酸纳米管，对其热处理前后的形貌和结构进行了表征，将其作为气-固色谱吸附剂制备出一种新型钛酸纳米管PLOT石英毛细管柱，同时考察了这种纳米管结构的钛酸作为固定相对C〓～C〓烷烃混合物、空气、SF〓以及CO和CO〓的分离能力。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。