查询词典 ND

The adulterating of the third ion Nd~(3+) is first discussed in detail.

本研究首次对掺入第三种稀土离子Nd~(3+)的方法进行研究，并确定了在本实验条件下Nd~(3+)的最佳掺入量。

A total of 29 groups of isotope age data such as Sr-Nd isotope age data and Nd model age data of igneous rocks, including granites, volcanic rocks, dyke swarms, cumulates, and ophiolites, formed in different periods of time are reported in this paper, which show the following two features:(1) igneous rocks including ophiolites formed in this area since 800 Ma BP all have high eNd and low Sri, with most Sri values centered in the range of 0.7045 to 0.7060 and eNd values in the range of 1 to 5, and (2) most of the TDM ages are in the range of 800 to 600 Ma, with only a few at 1000 Ma.

收集了本区不同时期形成的各类火成岩，包括花岗岩、火山岩、岩墙群、堆晶岩、蛇绿岩的Sr－N等30组同位素数据，从中可以看到以下两个特征：①研究区从800Mr以来形成的包括蛇绿岩在内的火成岩都有高εNd低Sri的同位素特征，绝大多数Sri集中在0.7065～0.7060之间，eNd集中在1～5之间。②TDM年龄较多集中在800 ～600 Ma，个别为1000 Ma。

Using modified conventional powder metallurgy process for sintered Nd-Fe-B magnets , including annealing of ingot alloy, hydrogen decrepitating, modified jet mill and adding additive during jet milling, we have mass-produced high performance and high corrosion resistance sintered Nd-Fe-B magnets from a conventional ingot alloy without strict protections against oxidation.

利用改进的传统粉末冶金工艺(铸锭热处理、氢爆、改进型气流磨设备以及在气流磨中掺入添加剂等)，在无严格的防氧保护情况下，从传统合金铸锭出发，工业化生产出具有高耐蚀性的N48～50档烧结Nd-Fe-B 磁体。

Objective To study the technique of using Nd:YAG laser in treating after-cataract in outpatients and to prevent complications.Methods According to the thickness of membrane to choose laser power.The methods of capsulotomy were crossed,horizontal,vertital,can-opening or circular along papillary margin.Results The result was satisfactory.

目的 探讨采用Nd：YAG激光行后囊膜切开术治疗后发性白内障的方法及其并发症的防治方法回顾分析我院门诊对74例98眼后发性白内障患者进行Nd：YAG激光后囊切开术，探讨根据膜的厚薄选择激光能量，分别采用&十&字切开（若后囊有张力者行张力线切开）、横形、纵形切开及环形或瞳孔缘开罐式切开方法。

In the light of the shortcomings of the mechanical internal cutter for use in the operation of well workover, a hydraulic internal cutter, named ND — S114 casing internal cutter, is developed.

针对油水井大修施工取换套管作业中使用ND—J114型机械式内割刀切割套管时操作工艺复杂、成功率低等缺点，研制开发了ND—S114型套管内割刀。

The crystal defect was observed and analyzed. Room temperature Nd:NYW crystal samples sized 3x3x5mm and 5x5x5mm were LD pumped at 808nm plane-concave cavity and double-concave cavity laser systems respectively, 1060-1064nm has been demonstrated.

室温下，分别用平一凹腔系统对尺寸为3×3×5mm的Nd：NYW激光晶体，用双凹腔系统对尺寸为5×5×5mm的Nd：NYW的激光晶体进行连续激光输出实验。

the Q-switched 532-nm Nd:YAG and Q-switched 1064-nm Nd:YAG laser can both improve skin elasticity and enhance dermal collagen content, inducing non-ablative rejuvenation,but the Q-switched 1064-nm laser has greater effect than the Q-switched 532-nm laer.

上述两种激光均具有一定的非剥脱性嫩肤作用，但是相比较而言，Q开关1064-nmNd：YAG激光可以取得较Q开关532-nm Nd：YAG激光更为明显的使用效果。

It can putout as high as 120mW power of 473nm blue laser. In my article, We analyze the energy level and Florence spectrum of Nd〓: YAG, make sure the value of the stimulated cross section and the absorb cross section.

在本论文中首先分析了Nd〓：YAG晶体的能级结构及其荧光谱线，计算出在946nm波长处的吸收截面和受激发射截面，并分析了Nd〓：YAG晶体能够在室温下以准三能级运转的原因，从而阐明它是目前最适合间接产生蓝光的激光材料。

The average initial value of ~(87)Sr /~(86)Sr for the gabro is 0.7045,εNd=-16.54,these characteristics indicate that the source of Qipanyan pluton has adifferent characteristics with EM1 source.

从Sr-Nd-Pb同位素特征来看，~(87)Sr /~(86)Sr初始值平均为0.7045，εNd值为-16.54，这些特征证明棋盘岩岩体源区与EMI源区性质并不一致。

Side pumped continuous wave and quasi-continuous Nd: YAG laser. The threshold and output power formula of side pumped CW Nd: YAG lasers have been derived out from the four lever rate-equations.

侧面泵浦的连续和准连续Nd：YAG激光器从泵浦光与振荡光空间分布相关的四能级速率方程出发，推导出连续运转的激光输出特性。

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。