激光

Molecular iodine has several hundred strong absorption lines near 532nm,several absorption lines were observed by using single-frequeny Nd:YVO4/KTP laser. There are new absorption lines which are not included in the nine groups recommended by CCDM in 1997.The wavelengths of these lines have been measured and the frequency stabilization investigated.

碘分子在532nm附近有上百条强的吸收谱线，采用单频Nd：YVO4／KTP激光对碘的一些吸收谱线作了观测，并进行了激光频率稳定的研究，这些吸收谱线是1997年9月国际米定义咨询委员会推荐作为频标的9组532nm碘吸收谱线之外的新的参考谱线。

A detailed CO2 laser-MIG hybrid welding experiment was carried out on the 4mm mild plates to discuss the relation of laser power, arc current, the maximum welding speed and the weld shaping , as well as the joint gap.

对此，采用4mm厚Q235钢板进行了CO2激光-MIG复合焊接研究，探讨了激光功率、电弧电流对最大焊接速度的影响及其和接头间隙对焊缝成形的影响规律。

Assisted gas such as N2, and air has little effects on the kerf, therefore air should be selected in view of lower cost. Uniform cut kerfs can be achieved with lower cutting speed under certain laser power or higher laser power at a certain cutting speed.

辅助气体N2和空气对上下切缝的影响不大，从经济角度应优先选择空气；为了得到上下均匀一致的切缝，同一激光功率下，切割速度应小些，而同一切割速度下，激光功率应大些。

The research results found that due to the energy characteristic of the hybrid welding, the lap welding joint of magnesium alloy appeared "pin shapes " and the microstructure characteristics can be divided into two parts: The top of bead was the zone acted by laser and TIG together, while the bottom of bead was acted by laser alone.

研究发现：复合热源搭接的能量特点导致接头宏观呈&图钉&形状，复合热源搭接焊的热循环特点导致了接头微观组织的特殊性：接头上部呈现激光焊与TIG焊共同作用下的组织特征；接头下部呈现明显的激光焊组织特征。

Comparison with grain size measured under proper conditions using traditional methods shows that the lase...

将合适条件下测得的软土粒度分布与传统方法得到的结果进行了对比分析，结果表明，激光粒度仪测量的粒径分布范围较广，采集的数据点比传统方法要密，测量的精度要高于传统方法，因此可以用激光法代替传统方法，以快速准确地测得软土的粒度分布。

Study of the Ablation Threshold of Er:YAG and Er,Cr:YSGG Lased Dental Enamel.

Er：YAG激光和Er，Cr：YSGG激光消融牙釉质的阈值研究。

One week later, each tooth was irradiated by Nd﹕YAG laser with three parameters. And the one of the four dogs was killed immediately and the teeth were extracted, immediately transected in lased areas and fixed in 10% formaldehyde solution.

一周后对不同的牙位以三种参数的激光照射牙齿，并在即刻、3 d、7 d、30 d四个时间段将犬处死，立刻取下所有的实验牙，并从激光照射区横断牙齿，分别将牙齿的冠根置入不同的固定液中。

Histopathologic examination showed there was no irreversible pulp injury when the dentin surfaces were irradiated by Nd﹕YAG laser with 33 J/cm2 and 56 J/cm2 output (output : 1 W). Vessel dilatation and exudation were found when lased under 111 J/cm2 output.

病理组织学检查显示：在激光功率为1 W的条件下，33 J/cm2、56 J/cm2的激光能量密度不会对牙髓组织造成明显影响，111J/cm2时个别牙齿会出现血管扩张、渗出的现象；牙髓反应以3 d观察期最明显。

Principally engaged in the development of laser technology and lasers and laser accessories production.

主要从事激光技术的研发和激光器及激光配件的生产。

Liquid solutions of lasing dyes are versatile sources of coherent tunable radiation, with many applications in different fields.

通常染料激光的工作介质是染料溶液，这就需求大量的有机溶剂，因而限制了染料激光在一些技术领域的应用。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。