查询词典 water column

Three analytical solutions are given including the wet front analysis solution of double medium soil column,the analytical expression of piezometric tube water head and saturation for steady state and the analysis solution of seepage in unconfined aquifer with a periodic boundary condition.

推导了双介质土柱表层水入渗的下渗锋面解析表达式、稳定状态时测压管水头分布与饱和度分布的解析表达式，并给出了有周期性边界条件的有限潜水层内渗流自由面的解析表达式。

The hydrodynamics of the new employed gradient ringent trapezoidal valve tray s are experimentally studied with the air-water system in a 500 mm×500 mm quadrate column.

采用空气-水系统，在500 mm×500 mm的方形塔内，对新开发的斜孔梯形浮阀塔板的流体力学性能进行了试验研究，测定了塔板压降、泄漏和雾沫夹带。

Log interpretation ; Irreducible water satura tion ; Resistivity ; Oil and gas formation ; Porosity ; Gas column ; Yinggehai Basin

测井解释；束缚水饱和度；电阻率；油气层；孔隙度；气柱；莺歌海盆地

Combinating the siol column and potted plant experiment synthesize analysis that the soil alkalinity below 30% can be all improved by hydraulic and agricultural measure without the chemical amendment. When the alkalinity is over 30%, however, the alkaline soil must be made use of the chemical measure gathering water conservancy to attain improvement .

结合土柱试和盆栽试验的结果综合分析，在土壤碱化度低于30%的轻、中度碱化土壤通过水利与农业措施相结合的办法而不用化学改良剂就可以改良好；而碱化度大于30%的土壤，必须在水利措施的配合下，利用化学改良剂才能达到改良的目的。

Methods The internal standard was diazepam, the samples were extracted by ethyl acetate after basified the plasma., the column was Hypersil C18, and the mobile phase mixed of methanol: water(75:25) containing 0.03%-triethylamine.

色谱柱为Hypersil ODS C18 4.0mm×250mm，流动相为含0.03%三乙胺的甲醇：水（75：25），流速1.0ml/min，紫外276nm波长检测。

A fully automated simultaneous determination of nitrate and nitrite in water samples by sequential injection analysis based on the Griess diazo-coupling reaction and the formed azo dye for nitrite at 540nm and reduction to nitrite using coppered cadmium column.

用顺序注射分光光度法，通过一次进样。同时测定硝酸根和亚硝酸根。亚硝酸根是根据格里斯重氮－偶联反应，形成偶氮染料后在波长540nm下进行检测。而硝酸根则通过镀铜镉粒还原柱还原为亚硝酸根后进行测定。

Methods: The sample that pass through handled to be abstracted twice by acetonitrile, evaporate the organic phase to dryness following defecated through the Na2SO4, cleaned-up by norm alhexalle, then analysed by HPLC (C18 column) with a gradient system of methanol-water as a mobile phase.

经处理过的样品用乙腈提取两次，将乙腈过无水硫酸钠层后挥千乙腈，正己烷洗涤净化，经过净化后进行高效液相色谱仪测定（C18柱），本方法以甲醇、水为流动相梯度洗脱，柱温35℃，在波长275 nm处测定。

The HPLC method has been used to investigate the stability of etimicin in 0.9% sodium chloride, 5% glucose, 10% glucose, compound sodium chloride, glucose sodium chloride and so on. In the experiment, the ODS-C18 column (4.6mm×250mm), mobile phase: methanol/water/acetic acid=80/16/4 (containing heptane sulfonic sodium 0.02mol/L), UV detection with wavelength of 330nm were employed. After integrating each of the menstruums with etimicin, the content and pH value were measured after 1h, 2h, 4h, 6h and 8h at a temperature of 17, 25 and 35℃, respectively.

实验采用HPLC法，以C18柱为色谱柱，CH3OH：H2O：HAc=80：16：4（含0.02mol/L庚烷磺酸钠）为流动相，检测波长330nm；对依替米星在生理盐水，5%葡萄糖，10%葡萄糖，复方氯化钠，葡萄糖氯化钠等溶媒中进行了稳定性研究，在室温(17℃)，25℃，35℃情况下，将依替米星与不同的溶媒配伍后，在1h，2h，4h，6h，8h分别测定它们的含量及pH值。

The organic layer was evaporated and the residue was redissolved by mobile phase.The concentrations of propofol and lidocaine were assayed on a hypersil BDS C18 column with a mobile phase consisting of acetonitrile-methanol-water（10∶60∶30）（including 0.14%n-butyamine 0.1%acetic acid）at a flow rate of 1 mL*min-1 and detected at 220 nm during 1～7 min and at 273 nm during 7～16 min.

氮气吹干有机层，残留物用流动相重新溶解后，用Hypersil BDS C18柱分析，流动相为乙腈-甲醇-水(10∶60∶30)，内含正丁胺0.14%和冰醋酸0.1%，流速为1 mL*min-1，检测波长：1～7 min用220 nm，7～16 min用273 nm。

The sample was extracted by deionized water. The extract was cleaned up and concentrated on a SPE column, then eluted by methyl-tert-butyl ether. The elution was concentrated under nitrogen and redissolved to 1 mL.

样品中24种目标物用蒸馏水浸出后，经固相萃取小柱富集净化，再用叔丁基甲醚洗脱，洗脱液氮吹浓缩定容后用气相色谱－质谱法测定。

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。