超声波

The effects of reaction temperature,reaction time,ultrasound frequency,agitating velocity and HCl amount on the yield and purity of abietic acid were investigated by orthogonal experiment.

通过正交优化实验考察了反应温度、反应时间、超声波频率、搅拌转速、盐酸用量对枞酸单离收率和纯度的影响，确定最佳异构化反应条件为：超声频率47.2 kHz，反应温度55℃，盐酸用量0.06 mL盐酸。

The optimized extraction method of total flavonoids in Abrus contoniensis was obtained with three times with 80％ ethanol at 20 times of volume for 30 min. The results implied that the best yield and quality may be obtained before leaves fall.

以药材20倍量的80％乙醇作为溶剂，用超声波提取3次每次持续30 min 即可获得最佳的鸡骨草总黄酮提取效果；在植株自然落叶前采收鸡骨草，容易获得最大的生物产量和质量。

Ultrasound, Expansive Graphite, Cinnamic Acid, Ethyl Alkylidene a- Cyanoacetate, Montmorillonite, Pinacol

超声波，膨胀石墨，肉桂酸，烷叉基氰乙酸乙酯，蒙脱土，片呐醇

2 Condensation of ketones with ethyl cyanoacetate catalysed by ammonium acetate-acetic acid results ethyl alkylidene cL-cyanoacetate in 3 l?.-89% yield under ultrasound irradiation at 4l-450C within

在超声波作用下，以芳香醛和丙二酸为原料，以膨胀石墨作催化剂，合成多种肉桂酸，于41～43℃反应3.5-10小时，产率65-97％。

The allylation reactions of aldehydes with allyl bromide were carried out in 76%～93% yields with Nd-SnCl2-H2O under ultrasound irradiation at room temperature for 50～60 min.

在Nd-SnCl2-H2O体系中，用烯丙基溴超声诱发下进行了一系列芳香醛的烯丙基反应，室温反应50～60min得76%～93%烯丙基化产物；而不用超声波时同样体系中搅拌3～4h高烯丙基醇产率为30%～86%。

The allylation reactions of aromatic aldehydes or ketones with allyl bromide were carried out in 60%～98% yields with Sn/H2O under ultrasound irradiation at room temperature for 45 min.

超声波作用下，Sn/H2O体系中，芳香醛酮在室温下进行烯丙基化反应，45min内得到60%～98%的烯丙基化产物

To study on extraction of essential oil from Alpinia officinarum Hance by cellulase and ultrasonic, the effects of ultrasonic time, temperature and time of water bath, amounts of cellulase on the extraction efficiency of essential oil from Alpinia officinarum Hance were investigated. And the influence of the four factors was determined by orthogonal experiment.

研究了酶法、超声波辅助水蒸气蒸馏法提取高良姜中的挥发油，对超声时间、水浴温度、酶作用时间、酶用量进行单因素实验分析，在此基础上做正交实验。

We analyze they are concerned with arterial diameter, stegnosis degree, anatomical position among arteries, compensatory circulation, the fixing of TCD, artery variation, angiospasm and the reliability of DSA.

我们分析与动脉管腔大小、狭窄程度、动脉之间的解剖位置、侧支循环代偿、TCD定位不准、颅骨对超声波的吸收，及血管变异和吻合、血管痉挛、代偿性高流速、DSA结果的可信度等有很大关系。

Methods The extraction conditions with ultrasonic wave were studied and the contents of polysaceharides were determined by the anthrone - H2SO4 colorimetric method.

方法对超声波提取湖北地黄多糖的条件进行了研究并用蒽酮-硫酸法测定了湖北地黄各部分的多糖含量。

Key words: ultrasonic; descaler; antiscale; removing scale

超声波；防垢器；防垢；除垢

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。