超声波

A type of novel dis-substituted α-arylglycine derivatives was synthesized in high yields and high regioselectivity via the stepwise Friedel-Crafts reaction of phenols with N-tosyl imino ester promoted by TiCl〓.

发现在Mg／MeOH／超声波条件下，能高产率的得到N-Tos裂解后N-Boc保护的α-芳香甘氨酸衍生物，实现了一条简单、实用的合成N-Boc保护的α-芳香甘氨酸衍生物的方法。

The experimental results indicated that the frost layer grew very slowly with the effect of ultrasound,and the frost layer composed by "frost line" was more inerratic.

结果表明，超声波对平板表面霜层的生长具有显著的抑制作用。

It is also desirable to have a reasonably fine grain in order to obtain ultrasonic inspectability.

为了获得良好的超声波探伤性能，也希望得到合适的细晶粒。

On the aspect of ultrasonic wave Transmit and Receive, we use two probes to realize the switching between transmitting and receiving mode; we also adopted a transmitted scheme based on intermissive multi-pulse, which develops the Time Difference with Interpolation, uses digital filter to adjust the waveform, and calculates the Time Delay with Correlation Arithmetic.

在超声波发射和接收方面，系统采用了两个探头进行发射和接收的切换，并采用了一种间隙式多脉冲发射方案；接收并采集数据后利用软件插值来提高时间分辨率，再用数字滤波来调整波形，最后用相关算法进行数据的相关运算，从而计算出时延得到流速。

This paper presents a design called needle destruction device based on the principles of the ultrasonic jointing .

介绍基于超声波焊接原理而设计的注射针头销毁器，并阐述其工作原理、结构设计、技术方案和应用场合等。

Results showed that amounts of total flavonoid and juglone by ultrasonic method were both more than common method and reflux method.

超声波提取法浸提核桃楸得到的总黄酮和胡桃醌提取量高于常规提取法和索氏提取法。

Juglone product was obtained from bark of J. mandshurica by ultrasonic extraction and vacuum distillation, and the yield of product was 0.09%. The product was characterized by FT-IR, GC-MS and 1H NMR.

研究采用超声波辅助浸提和减压蒸馏等方法，从核桃楸树皮中提取制得胡桃醌产品，产品得率0.09%。

Keratometry was measured with corneal topography,corneal central thickness and eye axis were measured with type A ultrasonic machine,and the data were statistically analysed with Excel 97 software.

在进行PRK治疗的患者中，根据屈光度将278例(538只眼)患者分成低、中、高和超高度四组，应用角膜地形图仪测定角膜屈光力，A型超声波测定眼轴及角膜中央厚度，数据用Exce 197软件计算处理。

E. coli cells harboring the recombinant plasmid was cultured with Laria broth medium and induced with isopropyl β-D-thiogalactopyranoside and detected from supernatant and precipitate of culture lysates by using SDS-PAGE.

将重组菌培养并经IPTG诱导后用超声波裂解菌体，取上清和沉淀同时作SDS-PAGE电泳后显示，上清中没有热休克蛋白A的表达，在沉淀中有热休克蛋白A的表达。

Methods The flavones were extracted by using ethanol as the solvent from Leonurus with ultrasonic wave and extraction method.A spectrophotometry was used to extract and check the flavones of Leonurus.The effect of Leonurus on scavenging of hydroxyl radicals was studied.

采用超声波乙醇浸提法从益母草中提取黄酮类物质，对所提取的黄酮类物质进行验证，并用分光光度法测定含量，用益母草总黄酮对羟自由基清除作用进行试验。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。