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So the process is offered using isomerization with separation. 1,2,4-trimethylbenzen is converted to 1,3,5-trimethylbenzen by isomerization. By means of precise distillation mesitylene is separated from products of isomerization as much as possible with high purity. 1,2,4-trimethylbenzen is recycled, at last , more mesitylene is produced and the productive cost is much lower .

为此，本文将催化异构化技术和精密精馏技术结合起来，通过异构化将偏三甲苯转化为均三甲苯，通过精密精馏技术将产物中均三甲苯最大限度的分离出来，得到很高的产品纯度，同时偏三甲苯循环使用，提高了均三甲苯的产量，降低了均三甲苯的生产成本。

By means of analysis, comparsion and synthesis, the author put forward that Xikuangshan super antimony deposit is formed by fluid of mantle metasomatism.

通过研究分析、对比与综合前人研究成果，本文提出锡矿山超大型锑矿是地幔交代流体活动形成的热液矿床。

In order to solve Oldano-Barbero paradox caused by the splay -bend elastic constant k13 in the continuum theory of nematic liquid c rystals,we determine the distribution of the director in the planar al ignment nematic liquid crystal cell by means of finite elements method .

为了解决液晶连续体理论中出现的Oldano-Barbero矛盾，用有限元方法计算平行排列盒中的指向矢分布。

This thesis firstly elaborates on researches at home and abroad on factors affecting the development of the construction industry, defines the contents of the construction industry, introduces its function and expounds the impact mechanism of various factors affecting the construction industry. Secondly, this thesis carries on a brief analysis on the current situation of development in Anhui construction industry to reflect its achievements and shortage since the beginning of reform and opening up, and makes a comparative analysis and comprehensive evaluation on the regional development level of Anhui construction industry through the method of Factor Analysis. Thirdly, this thesis tries to calculate the contribution rate of technical progress, labor and capital in economic growth of Anhui construction industry with the method of linear regression, empirically analyze the external factors affecting the development of Anhui construction industry by means of co-integration and granger causality test, and predict the development of Anhui construction industry by using the method of principal components regression.

本文首先对国内外有关建筑业发展影响因素的研究现状进行详细论述，界定建筑业的内涵和介绍建筑业的作用，研究各因素对建筑业发展的影响机理；其次，对安徽建筑业发展现状作了概括性的分析，以反映改革开放以来安徽建筑业取得的成绩和存在的不足，并运用因子分析法对安徽建筑业区域发展水平作了比较分析和综合评价；再次，运用线性回归法测算出安徽建筑业经济增长中的技术进步贡献率、劳动贡献率和资本贡献率，然后运用协整和Granger因果检验方法实证分析安徽建筑业发展的外部影响因素，运用主成分回归方法对安徽建筑业发展作了精度较高的预测。

By means of the treatment of low-temperature plasma ,the cotton fiber is modified by chitosan to improve the moisture absorpation and micro-organism resistance.

在低温等离子作用下，利用壳聚糖对棉纤维进行改性处理，以改善棉纤维的抗菌性能和吸湿性能。

］ In order to study the effect of machining processes on the surface condition of fastening holes drilled on 7075 aluminum alloy for aircraft assembly, the surface microphotograph and surface layers microstructure produced by the five kinds of drilling processes were observed and analyzed by means of SEM and optical microscope.

摘 要］为研究加工工艺对7075-T7351铝合金飞机装配紧固孔表面质量的影响，通过扫描电子显微镜和光学显微镜，分别对5种不同制孔工艺所产生的表面微观形貌和表层组织变化进行了观察和分析。

The reaction of the mixed rare earth concentrate including monazite (REPO_4) and bastnaesite (REFCO_3) decomposed by CaO and NaCl additives in the temperature of 100～1000 ℃ was studied by means of XRD and TG-DTA.

用XRD和TG DTA热分析技术，研究了含独居石和氟碳铈镧矿的混合稀土精矿在100～1000℃焙烧过程中，添加CaO，NaCl时，REPO4和REFCO3的分解反应。

By means of questionnaire and field survey, the current and historical distribution of Moschus berezovskii in Fengxian County of Shaanxi Province was investigated in 2005 summer and 2006 spring, and the distribution patterns of the forest musk deer in last fifty years were shown by the colored blocks on the digital maps.

于2005年夏季和2006年春季，采用问卷调查结合野外实地验证，对陕西凤县林麝的现时及历史分布进行了分析，并将所得分布信息叠加至数字化地图，绘制成林麝近50年的分布区变迁图。

On the basis of computer two-eye vision technology and heterodyne multiple frequency technology, 3D dense point cloud optical measurement software named by XJTUOM software had been developed,3D data of the object surface mought be acquired precisely by means of this way, According to the whole marked points come from XJTUDP,every pieces of point cloud mought be assembled automatically.

开发的XJTUOM三维光学密集点云测量系统软件，基于外差式多频相移技术和计算机双目立体视觉技术，可以精确采集物体表面的三维数据，利用XJTUDP产生的全局标志点，可以实现每幅点云的自动拼接。

ABSTRACT: By using image processing software, based on the coordinates of clear points in images and the theoretical coordinates of the points in the reference coordinate system, the coordinate relation multinomial of pre-and post-correction control points can be established by means of the digital image correction technique and the coefficient in the multinomial can be sought on the basis of the coordinates of a certain number of control points.

前言 考古绘图一直是考古学研究中不可或缺的重要技术，能够反映考古遗迹的分布状况或者典型器物的多重特征。但是随着考古学研究的深入和对相关技术手段需求的增加，考古绘图技术却始终停留在通过直尺等量取数据、再使用直尺和铅笔绘图的水平上，成图精度很低，周期较长，图形品种单一，远远不能满足现代考古学研究的需要。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷