查询词典 stepwise enhancement

We study the field enhancements in the waveguide structures by doped semiconductor material, and analyze their electromagnetic fields for different structures under the plane wave illumination or the short pulse. We design several doped silicon slots cavity and slot chains with large field enhancement, and describe their physical mechanism.

我们研究掺杂半导体波导结构对兆赫波电磁场增益之影响，使用电磁模拟针对不同结构做探讨，并分析连续波和脉冲波之电磁场变化，设计具有强场增益之掺杂半导体的矽狭缝和矽狭缝链之结构，并探讨其物理机制。

Five novel torsion-mirror optical actuators including double-beam thickness differential structure with single torsional axis, double flexible folded-beam structure with single torsional axis, double-beam vertical torsion comb structure with single torsion axis, four-beam differential compound-micromirror structure with double torsional axis and the combined structure of the four basis forms above, are brought forward. All of these devices could be fabricated by the same silicon micromachining process we have developed. The deformation compensation design with local enhancement for the thin torsional beam which is the key structure of these devices is also put forward to improve the reliability. The three-dimension solid model and two-dimension reduced order model of the torsion-mirror optical actuator are established and then the numerical simulations for evaluating the device characteristics of the statics, dynamics, electrostatic field, mechanical and electrostatic coupling, fluid and solid coupling are carried out to optimize the structure design. Furthermore, three optical fibre clamping structures which could be integrated monolithicly are designed and analyzed to improve the optical coupling capability. 4. Three flexible process flows combined with bulk silicon micromachining and surface silicon micromachining are brought forward to fabricate these novel single-crystal silicon or polysilicon torsion-mirror optical actuators by using the same lithography masks for both SOI wafer and regular silicon wafer. A series of important process experiments are carried out to optimize the process parameters and the process flows. Some novel and typical process phenomena which occurred during the microfabrication are analyzed and then the corresponding solutions are put forward. 5. A MEMS dynamic testing system which exploit blur image synthetic technique, stroboscopic image matching technique, stroboscopic mirau microscopic interferometry technique and microscopic laser dopper vibrometer technique is set up to measure three-dimension and six-freedom micro motions of any MEMS devices with nanometer resolution.

在对硅微机械扭转镜光致动器的光机电特性系统地理论研究的基础上提出了硅微机械扭转镜光致动器的结构设计准则。3、提出了单轴双梁厚度差分结构、单轴双柔性折叠梁结构、单轴双梁垂直扭转梳齿结构、双轴四梁差动复合微镜结构以及以上四种基本结构组合后的衍生结构等五种工艺加工技术兼容的新型的硅微机械扭转镜光致动器，对器件关键结构薄厚度、高耐疲劳扭转梁进行了局部加强的变形补偿设计，建立了器件的三维实体模型以及两维降阶模型，对提出的新结构硅微机械扭转镜光致动器进行了系统的静力学、动力学、静电场、力电耦合和流体固体耦合的建模仿真与优化设计，同时设计并分析了三种可实现单芯片集成的弹性光纤定位夹紧结构。4、提出了组合体硅微加工技术与表面硅微加工技术、兼容同一套光刻版图、可分别基于SOI 晶片和普通Si 晶片、适应于制造提出的各种新结构单晶硅和多晶硅硅微机械扭转镜光致动器的三套柔性加工工艺流程，开展了一系列重要工艺步骤的单项工艺试验，对工艺流程与工艺参数进行了优化，针对加工过程中出现的具有普遍意义的典型工艺问题进行了讨论和分析，并提出了解决方法。5、创新性地将模糊图像合成技术、频闪图像匹配技术、频闪Mirau 显微干涉技术与显微激光多普勒测振技术有机结合，建立起了一套周期运动测量与瞬态运动测量相结合、单点运动测量与全视场运动测量相结合、满足不同MEMS 器件各种动态测试要求的集成的MEMS 三维六自由度微运动精密测量系统。

Methods Among 9 cases of brain cysticercosis,7cases were examined by downfield type MR machine,2 cases were examined by highfield and superconduct type MR machine,8 cases were performed enhancement scanning.

方法临床确诊的脑囊虫病9例，低场永磁型磁共振机扫描7例，高场超导型磁共振机扫描2例，其中增强扫描8例。

John Kassotis, MD, associate professor of medicine at SUNY Downstate, said, The protection against death from heart disease in the elderly afforded by caffeine is likely due to caffeine's enhancement of blood pressure.

"约翰kassotis医学博士，副教授，中医在纽约州立大学downstate说，"保护，防止严重心脏病的中老年人所给予的咖啡因，可能是由于咖啡因的提升血压。

Dredging grab is a very important component of dredger, the enhancement of its working efficiency, will be helpful to the dredging efficiency directly, and also will enhance the capability and working efficiency of the dredger, this is meaningful to the dredging industry.

作为挖泥船的重要组成部分之一疏浚抓斗的挖掘效率的提高，将从源头上影响挖掘的效率，提高挖泥船的工作能力和效率，这对于疏浚有着现实的意义。

Objective To discuss the frequent etiology of cerebral dura mater enhancement on MRI for definite diagnosis.

目的 分析MRI提示硬脑膜强化的常见病因，以便为此类疾病的诊断提供帮助。

Methods A total of 20 patients with dura mater enhancement were respectively analyzed. Clinical data case history, physical examination and lab findings.

对20例MRI增强扫描示硬脑膜强化患者的病史、体征及辅助检查结果等临床资料进行综合分析。

Here, we investigated the roles of the PM NADPH oxidase in nickel-induced enhancement in production of ROS and the activity of antioxidant enzymes such as SOD, CAT and GR in roots of wheat Triticum durum D.

而且，镍导致ROS增加以及抑制剂对这些参数抑制的规律与镍和抑制剂对质膜NADPH氧化酶活性影响的规律类似，这些结果证明，镍诱导产生的ROS导致了膜脂过氧化，而这些ROS主要来自质膜NADPH氧化酶。

Although the frequency of dust storm is reducing, the intensity is increasing, even has the enhancement tendency in recent years.

尽管沙尘灾害频次总体上在降低，但强度在增加，近年来有增强的趋势。

Furthermore, this project has some value in research on the field of EHD heat transfer enhancement and broaden the connotation of gas-liquid interface dynamoelectric.

此外，该项目对EHD强化换热冷凝换热效应的研究，对拓宽气液界面电动理论的内涵有一定价值。

However it can often be frust ating for a child when people are unable to pronounce their name.

但它往往可以令人沮丧的一个孩子当人们无法断言他们的名字。

All these compounds were obtained from this genus for the first time. Compound, 4-cumylphenol, was a new nature product.

所有化合物均为首次从本属海藻中分离得到，其中4cumylphenol为新天然产物。