柱

The chloroform layer and the aqueous layer were separated by multiple column chromatography including macroporous resin, silica gel and polyamide column and preparative HPLC. The compounds obtained were identified by mass spectra and NMR data.

大青叶乙醇提取物，用氯仿萃取后得到氯仿层和水层，各层再分别采用硅胶柱、大孔树脂柱、聚酰胺柱、制备液相、葡聚糖凝胶柱层析及重结晶等分离手段进行分离、纯化，并应用化学性质和质谱、波谱法（1H-NMR、13C-NMR、HMBC）鉴定其化学结构。

In this paper,the detailed preparation process of gas chromatographic column for separating benzene series was introduced,the optimum column temperature and flow rate of carried gas were selected for separation the mixture of cyclohexane,benzene and toluene,and the column performance has been studied in respects to column efficiency and separating size.

本文主要介绍了气相色谱柱的详细制备过程，并以环已烷、苯和甲苯的混合物的分离为例，选择了最佳的操作条件。同时从柱效率和分离度两方面考察了该色谱柱的柱性能。

The results show that as the wind is along one leg of the model, the vibrations which are mainly caused by turbulence of oncoming flow are weak, and as the wind is along the angular bisector of two legs, the vibrations induced by vortex are strong.

实验结果表明：当风向顺Y型柱体某一肢时主要是来流脉动引起柱体较弱横向振动；当风向顺Y型柱体两肢分角线时则由涡脱落而引起柱体强烈的横向振动。

By Vis-UV detector, column efficiencies of conically shaped preparative chromatographic columns with porous polytetrafluor oethylene frit and porous stainless steel frit were compared.

利用柱后可见-紫外检测，比较了采用多孔聚四氟乙烯材料和多孔烧结不锈钢材料作为台锥形制备液相色谱柱柱头筛板材料时的柱效；用柱上可视化方法研究了柱头筛板的直径对流型的影响。

Then, for the first time, a finite element model of the cylindrical shell surface was bring forward and set up.

首次提出和建立了柱体坐标系下的曲面柱壳单元有限元模型，以及在柱坐标系下的边界元法基本方程和柱坐标系下无限域与半无限域基本解。

In addition, other parameters, such as the final concentrations of the displacer making the pair of biopolymer be almost completely separated, a〓 and a〓 were also found to effect on the L〓 and L〓.

用有效迁移柱长和最短柱长的公式计算出了在所选定的高效疏水色谱条件下六种蛋白质的有效迁移柱长和最短柱长。

In the column tests,when the composite nano-scale Fe3O4 suspension was introduced in the downflow mode through the soil column,72% of Fe3O4 penetrated through the soil bed under gravity.

在土柱实验中，将2种Fe3O4悬浊液注入到10cm高的土壤柱中，72%的复合纳米Fe3O4穿过土壤柱溢出，而微米Fe3O4完全滞留在土壤柱中没有溢出。

Main products: Pressure riveting screw, nut riveting pressure, pressure riveting nut -, Inserts into the nut, rose riveting nut, floating nut, ground-nuts, nut-squeezing, Spring screws, self-locking nut, positioning support columns, targeted marketing, sales support cards, in spring, the combination of screws, rivets hollow, as well as various Pressure riveting type of plastic fasteners, etc.!

主要产品有：压铆螺钉，压铆螺母，压铆螺母柱，镶入螺母，涨铆螺母，浮动螺母，接地螺母柱，挤压螺母柱，弹簧螺钉，自锁螺母，定位支撑柱，定位销，支撑卡柱弹簧销，组合螺钉，空心铆钉，以及各种塑料压铆类紧固件等！

It introduces the right discrimination method of frame short column in the high-rise building and brief describes some effective section forms of improving the tensility of frame column.

介绍了高层建筑框架短柱的正确判别方法，简述了几种有效提高框架柱延性的截面形式，提出短柱的抗震构造措施，以提高短柱的承载力和延性，改善短柱的抗震性能。

It is shown that the contact interaction enables bottom drillstring to whirl backward, and then an alternate bending stress with higher frequency is produced. So the drillstring fatigue failure could be accelerated. At the same time, a quite strong wallop force of high frequency is produced on the contacting point, and the contacting zone is next to the screw coupling of drill collars. It will easily result in the failure of screw couplings. The research results provide theoretical basis for the prevention of drillstring failure.

研究表明，下部钻柱与井壁的碰摩作用使下部钻柱反向涡动，产生高频的交变弯曲应力，会加速下部钻柱疲劳破坏；下部钻柱与井壁接触点处存在较大的高频冲击力，并且接触区域靠近钻铤螺纹联结处，更容易诱发螺纹联结处失效，该研究成果可为预防钻柱失效提供理论依据。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。