查询词典 ablator

We deduce the formula of the critical thickness of ablator, and put forward the rule of how the thickness of ablator affect the velocities and the stability of flyer.

理论上从阻抗失配效应的临界密度公式，推导出了烧蚀层的临界厚度，并推广到飞片的情形，提出了烧蚀层厚度对飞片速度和稳定性的影响规律。

In chapter five, the results of the experiments are analysed, we draw a conclusion that the thickness of ablator should try to reach the critical thickness.

第五章是实验结果和分析，最终得出了烧蚀层厚度应当尽量达到临界厚度的结论。

At last, the results of the theory, the numerical simulation and the experiments are summarized. It is concluded that the thickness of the ablator should try to reach the critical thickness.

最后，我们总结了理论、数值模拟和实验三方面的结果，提出了在不出现严重二维效应和卸载波效应的前提下，烧蚀层厚度应当达到临界厚度的设计原则。

Investigations and experiments indicate that charring ablator s provide the most efficient thermal protection shield for the re-entry vehicles.

载人飞船返回舱的烧蚀热防护技术研究和试验表明，碳化烧蚀材料是再入飞行器最有效的热防护层。

According to the shape of the ablator surface the particle concentration and angle versus time was obtained through projection which can then be used to calculate the critical thickness of char layer. According to this thickness whether or not char layer been ablated is decided.

计算过程中根据烧蚀求解区域的变化自动生成网格并实现了局部加密，根据烧蚀型面进行投影获得了随时间变化的浓度和角度分布，并将其用于计算当前时刻的临界炭层厚度作为判断炭层脱落的依据。

Recent studies have shown that ultrasound-guided percutaneous microwave ablation is a simple, safe and potentially effective treatment for patients with liver tumors. To facilitate normative application of this technology further and make it more objective and predictive, there are many problems should been solved, such as pre-operative planning, intra-procedural target localization, precise and consistent placement of the tissue ablator device, and quantitative procedure evaluations.

近十年来的大量研究结果表明超声引导经皮微波消融治疗肝肿瘤是一项微创、安全、有效的治疗方法，为进一步推进该技术的规范化应用，使之建立在更加客观和可预见性的基础上，便于该技术的普及应用，需解决治疗前的科学规划、治疗中的准确定位、稳定穿刺及对治疗过程的量化评估等问题。

Finally, we test the velocities of three flyers with ablator of different thickness, the result indicates that we can measure the velocities of flyer which can further calculate the released particle velocities, and validate the verdict of theory and simulation.

最后，实验实测了三种烧蚀层厚度不同的飞片的飞行速度，结果表明飞片法可以测得飞片速度，进而求解粒子速度，而且证实了理论和数值模拟的结论。

Lasers characteristic as a shock wave drive and the advantages of KrF laser are explained. Finally, the progress at home and abroad is enumerated.In chapter two, the basic principle of the EOS study is introduced. Specially, the impedance mismatch effect of the double-layer flyer is mentioned here. It is the primary theoretical basis of this paper.In chapter three, a one-dimension, three-temperature hydrodynamic code HYADES is introduced briefly. it is used to make a qualitative analysis about how the thickness of ablator affect the flyer velocities and stability.In chapter four, the experimental setup is described.

第一章为绪论部分，简要总结了状态方程研究的历史，激光作为冲击波驱动源的特点和KrF激光的优势，以及国内外的进展情况；第二章是本工作的理论基础，讨论了冲击波物理和雨贡纽曲线测量的基本原理和方法，重点介绍了激光飞片法的特点、关键要素和双层飞片的阻抗失配效应，鉴于KrF激光短波长和长脉宽的特点，我们拟对双层飞片的特性展丌研究工作，为实测状态方程做好准备；第三章简单介绍了一维三温流体力学数值模拟程序Hyades并运用它进行了若干状态方程实验的计算和设计，进行了烧蚀层厚度对飞片速度、稳定性的影响的定性分析；第四章是实验平台描述部分，介绍了光束平滑化技术，靶的制作，条纹相机的原理和使用，系统同步控制以及光学记录速度干涉仪系统的简单原理和构成。

Laser's characteristic as a shock wave drive and the advantages of KrF laser are explained. Finally, the progress at home and abroad is enumerated.In chapter two, the basic principle of the EOS study is introduced. Specially, the impedance mismatch effect of the double-layer flyer is mentioned here. It is the primary theoretical basis of this paper.In chapter three, a one-dimension, three-temperature hydrodynamic code HYADES is introduced briefly. it is used to make a qualitative analysis about how the thickness of ablator affect the flyer velocities and stability.In chapter four, the experimental setup is described.

第一章为绪论部分，简要总结了状态方程研究的历史，激光作为冲击波驱动源的特点和KrF激光的优势，以及国内外的进展情况；第二章是本工作的理论基础，讨论了冲击波物理和雨贡纽曲线测量的基本原理和方法，重点介绍了激光飞片法的特点、关键要素和双层飞片的阻抗失配效应，鉴于KrF激光短波长和长脉宽的特点，我们拟对双层飞片的特性展丌研究工作，为实测状态方程做好准备；第三章简单介绍了一维三温流体力学数值模拟程序Hyades并运用它进行了若干状态方程实验的计算和设计，进行了烧蚀层厚度对飞片速度、稳定性的影响的定性分析；第四章是实验平台描述部分，介绍了光束平滑化技术，靶的制作，条纹相机的原理和使用，系统同步控制以及光学记录速度干涉仪系统的简单原理和构成。

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我们完全可以满足你方的需求。

We are all pervade d with a sense of disaster.

我们普遍有大祸降临的感觉。