查询词典 Z-twist

The two-photon absorption cross-sections of these styryl derivatives were determined by Z-scan technique, and the benzothiazolium derivatives exhibited the largest TPA cross-sections (10〓s·cm〓/photon) and the best power limiting ability at high operable incident intensity. The results show that the benzothiazolium derivatives are promising organic compounds as two-photon absorption optical limiting materials. 2. Several organic dyes active to 800nm femtosecond laser with D-π-A structure were designed and synthesized.

研究了它们的上转换荧光、上转换激射和光限幅行为，通过改变染料分子共轭体系的大小，首次实现了在576nm-635nm范围内的双光子上转换激光波长的调节，其中噻唑啉碘盐类二苯乙烯化合物的双光子上转换激射峰（576nm）是迄今在1064nm皮秒激光作用下能够得到的最短波长的激光；阴离子显著改变上转换激射效率，但对上转换荧光峰和激射峰的位置影响很小；增加溶液的浓度，上转换荧光光谱和激射光谱红移，并在一定的浓度范围内，能够有效的提高上转换激射效率；利用Z-扫描技术测定了染料分子的双光子吸收截面，发现苯并噻唑类染料分子的双光子吸收截面高达10〓s·cm〓／photon，而且在较大的入射光强范围内，这类染料分子具有较大的光限幅能力，是一类作为双光子吸收光限幅材料很有潜力的染料分子。

The Z factor of MCHR1 and MCHR2 cell model is 0.63 and 0.71. The optimizing results showed that the cell number was 3×104 per well with no more than 10 g/L dimethyl sulphoxide concentration was the best for MCHR1 screening condition.

MCHR1和MCHR2细胞模型的Z因子为0.61和0.73，并对筛选条件进行了优化，确定了实验系统中细胞的数量为3×104个/孔和二甲基亚砜的终浓度为不超过10 g/L系统最佳。

Most conventional methods for the extraction of substrate network were based on the use of frequency behavior of Y22 + Y21. However, we found that the feedback signal through the internal circuit elements makes the conductance of the substrate network underestimated while makes the susceptance of the substrate network overestimated. If conventional methods are directly performed on large area SiGe HBTs, a negative effective substrate resistance will be extracted. In the first part of the thesis, a new extraction method for the substrate network parameters of SiGe HBTs is proposed. When extracting the substrate network parameters, the feedback signal through internal circuit elements is considered. All the circuit elements of substrate network are extracted from Ysub instead of Y22 + Y21. The extracted substrate network parameters show a different bias dependence as compared to the conventional methods. By using a simple n+-p junction, we successfully explained the extracted bias dependent substrate network parameters. We developed a series linear regression equation to extracted the intrinsic circuit elements from the ABCD parameters. Compared with the conventional methods which extracted the circuit elements from Y-parameters or Z-parameters, the proposed method is much simple and easy to implement in the computer programs.

传统方法在萃取基板网路参数时，常常由所量得的Y22 + Y21来著手，但我们的研究发现，利用Y22 + Y21的频率关系来萃取基板参数时，基板网路的电导会被低估而基板网路的电纳则会被高估，另外传统基板网路参数萃取方法在萃取大尺寸元件基板网路参数时会得到负值基板等效电阻，以上的非理想效应皆因忽略部份信号会经由本质参数对基板网路做回授的影响，因此本论文中提出一个新的基板网路参数萃取方法，在萃取基板网路参数时考虑了由本质参数所回授的信号，并且由Ysub而非Y22 + Y21萃取基板等效电阻、基板等效电容及基板与集极空乏电容，成功的解决上述的一些非理想效应，所得到的基板网路参数与集极偏压的关系与传统方法所得的趋势相异，经由一个简单的模型成功的解释了所萃取得到的基板网路参数与偏压的关系，在萃取本质参数时，我们舍弃传统萃取方法中常用的Y参数或Z参数萃取方程式，而改用ABCD参数，并提出一系列的线性回归方程式，萃取所有的本质参数，与传统方法比较起来，比较简单而且容易建立在使用者的参数萃取软体中。

In some embodiments, compounds described by the formula N(H.sub.vR.sub.wR'.sub.xR''.sub.yR'''.sub.z)Cl, may comprise ammonium chloride, methyl ammonium chloride, tetramethylammonium chloride, tetraethylammonium chloride, or combinations thereof.

在某些实施方案中，由化学式N(HvRwR'xR''yR'''z)Cl所表述的化合物可包括氯化铵、氯化甲基铵，氯化四甲基铵、氯化四乙基铵或它们的组合。

Objective To investigate the effect of anterior decompression and Z-Plate internal fixation in the treatment of thoracolumbar burst fracture.

目的 探讨前入路减压Z-Plate内固定系统治疗胸腰椎爆裂性骨折的效果。

The article introduces some needed resolving problems. It brings forward principium of control, How can drive the servo signal and X and Z to the coordination of movements; How to change the feed rate; design of system structure, confirmation for input and output point, I / O address allocation;and also the project for speedup/down control during the screwthread processing. Method of programming design and manual operation trapeziform figure in system of numerical control lathe Corresponding project to problems is provided synchronously.

介绍可编程控制器应用于车床数控系统需要解决的问题，如何产生驱动伺服机构的信号及X、Z向的动作的协调；如何改变进给速度等；提出PLC作为数控机床主控制器的控制原理；系统结构设计；输入/输出点数确定及输入/输出点的地址分配；螺纹加工中升、降速的解决方案；程序设计及具体操作梯形图设计的方法，并给出相应的解决方案。

A represents the labeled fragments as position control; H1 represents the human H1gene as positive control; NEG represents the 431 bp fragment of bacterial 16s RNA as negative control; X,Y,Z,R,T,U represent the uncharacterized genes of SARS virus, which functions are unknown, the number under the parenthesis represents the position of each gene on the virus genome.

其中A表示利用已经标记好的片段作为坐标点；H1为人H1基因cDNA片段，作为芯片杂交的阳性点；NEG表示细菌16sRNA的一段长431bp片段作为芯片杂交的阴性点；X，Y，Z，R，T，U为推测的蛋白编码区，其功能还不清楚，括号内数字表示在基因组上的相对位置。

In this paper,an analysis is made to the movement of the adjustable six rod mechanism of the main driving system of Z-M connecting rod pulse step less speed variator and a research has been done to the moving characteristics of the variato

本文对Z－M型连杆式脉动无级变速器的主传动系统的可调六杆机构进行了运动分析，并对该变速器的运动特性进行了研究。

Methods 16 cases of thoracolumbar burst fractures with spinal cord or equina cauda injuries were treated with anterior subtotal vertebrectomy, Pyramesh with bone debris intervertebral implantation and Z-plate fixation.

16例胸腰椎爆裂性骨折伴脊髓或马尾损伤患者进行前路椎体次全切除减压，自体碎骨装入Pyramesh钛网后行椎体间植骨，加用Z-plate内固定。

It goes without saying that the 'Z' of Zonta provides the motif. Don't you think the letter style communicates a sense of speed?

它不仅是Zonta的Z，你不觉得这个字母表现出一种速度的感觉吗？

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。