内柱

The separation was achieved within 4 min using a BEH Shield RP18 column (100 mm 2.1 mm, 1.7 μm) with 50 mmol/L monoammonium phosphate solution (pH 6.5) and acetonitrile as the mobile phase.

以BEH Shield RP18柱(100 mm 2.1 mm，1.7 μm)为分析柱，以50 mmol/L的磷酸二氢铵(pH 6.5)和乙腈为流动相进行梯度洗脱，3种磷酸腺苷在4 min内实现了较好的分离。

ABSTRACT Objective To establish an HPLC method for the determination of azithromycin powder.Method The chromatographic conditions were as followed: C8 column, 0.045 mol/L ammonium phosphate monobasic solution∶acetonitrile (2∶1)(adjusted to pH7.35 with triethylamine) as mobile phase, temperature: 40℃, the flow rate: 1.0 ml/min, detection wavelength: 210nm.

阿奇霉素为氮杂内酯类抗生素，日抗基和《中国药典》2005年版［1］均采用微生物检定法测定其含量，《欧洲药典》4.6版和USP26版中均采用HPLC法，专属性较强，试验周期短，但均使用的是聚合物极性柱，《欧洲药典》柱温为70℃，USP采用电化学检测器，其采用的设备在我国药检部门尚未普及［2］。

Anhui Institute for Drug Control, Hefei 230051ABSTRACT Objective To establish an HPLC method for the determination of azithromycin powder.Method The chromatographic conditions were as followed: C8 column, 0.045 mol/L ammonium phosphate monobasic solution∶acetonitrile (2∶1)(adjusted to pH7.35 with triethylamine) as mobile phase, temperature: 40℃, the flow rate: 1.0 ml/min, detection wavelength: 210nm.

阿奇霉素为氮杂内酯类抗生素，日抗基和《中国药典》2005年版［1］均采用微生物检定法测定其含量，《欧洲药典》4.6版和USP26版中均采用HPLC法，专属性较强，试验周期短，但均使用的是聚合物极性柱，《欧洲药典》柱温为70℃，USP采用电化学检测器，其采用的设备在我国药检部门尚未普及［2］。

The mix packing gained the anticipative effect. The orderless packing of the filling in the fine separation region plays a role of stabilization foam layer and decreasing the ash of concentrate. The plates in the separation region change the flowing state and increase markedly the ash grades along the column height.

混合充填模式取得了预期的效果，精选区域的填料乱堆充填起到了稳定泡沫层与降低精煤灰分的作用；分选区域的筛板充填改变了柱内的流动状态，显著提高了沿柱高的灰分梯度。

Organic pillaring reaction has an important signification for researching the montmorillonite micro structure and understanding the reaction mechanism between natural organic matters and minerals.

蒙脱石有机柱撑反应对于探测蒙脱石内部微结构特征、了解柱撑产物体系中有机物与矿物的作用机制和有机物在层间域内的性质、构型研究都具有重要意义。

Methods:The RP-HPLC method was applied and protocatechuic aldehyde was used as the internal standard substance.

采用RP-HPLC法，以原儿茶醛为内参照物，色谱柱：Luna C_(18)柱(250mm×4.6mm，5μm)，流动相：0.05%磷酸水溶液-乙腈，梯度洗脱程序为：0min时A-B(100∶0)，80min时A-B(67∶33)，85min时A-B(60∶40)，100min时A-B(60∶40)，流速：1.0mL·min~(-1)，检测波长：280nm。

Through analyzing the s tressed state of each part of the drill string in borehole,the four main charact eristics and basic reasons of the drill string failure that often occurs and is of general character are analyzed and the feasible,scientific and effective meas ures for preventing these common drill string failure accidents are emphatically proposed in this paper.

文章从分析钻具在使用过程中的受力情况出发，根据钻柱各部位在井内的受力情况，剖析了四种经常发生的、带共性的钻柱失效的主要特征及根本原因，重点提出了比较可行的、科学的预防这几种常发性钻具失效事故的有效措施和看法。

From the analysis of the magnetic susceptibility,TOC,TN,pigment,organic car-bon isotope ,HI,saturated hydrocarbon and 14C dating etc. of the sediment samples from coresof two boreholes in the Taihu lake,a knowledge of the evolution of paleoenvironment of thelake during the last 14ka is achieved. The results show that the lake has undergone the fol-lowing stages .. The Lake was at a low level ,or even became exposed during 14.3-13.3kaBP,reflecting an arid climate. There existed a transitional stage during 13.3-12.4kaBP,the climate being slightly warm and wet. There are indications of a cold and dry climate around 11.5kaBP,probably corresponding to the Younger Drays event ,comparable with other areas in east China.

本文根据东西太湖短柱岩芯的沉积物的物理、化学、生物指标的综合分析，讨论了该区距今14ka来的古气候变化过程，结果表明14.3-13.3kaBP，太湖水位低，环境指标甚至表现为暴露特征，反映了气候干旱：13.3-12.4kaBP，为偏暖湿的过渡阶段；该孔柱270-280cm(11.5kaBP左右)各类指标均明显更映冷干特征，可能是Younger Drays事件的记录，与我国东部其它地区有可比性；约10.9-10kaBP，这一时期是整个研究时段内一个较显著的温暖期。

The Esplanade region is known for the dramatic weathered-sandstone pillars called hoodoos that dot the landscape.

艾司普拉内达地区以随处可见的岩柱而闻名，这些沙岩柱经过风雨洗礼，形状奇特，令人影响深刻。

For thin polycrystalline films, especially those with columnar structure, once the diameter of grains on the film surface is larger than the film thickness, the total area of above and under basal planes (film-substrate interface) will be larger than that of side plane.

对于薄膜特别是柱状晶薄膜，当晶粒在膜平面内的尺寸大于膜厚时，柱状晶粒的上底面和下底面的面积将大于侧面的面积，因此薄膜中的晶粒生长除像整体材料中的晶粒生长一样考虑晶界能外，还需要考虑表面能和界面能，因为各向异性的表面能和界面能将导致薄膜中的异常晶粒生长和织构变化。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐