查询词典 on the threshold

Unfortunately, research on this issue is on the threshold of the embryonic stage.

遗憾的是，这方面的研究尚处于萌芽状态。

The vapour and plasma ignition times of the target are got based on the equation of heat conduction and cascade model. We suppose that the plasma is ignited when 210 generations of new electrons are born in vapour generation time. The influence of temperature on the thermodynamics and optics parameters of material also have been considered in the model. The resulting theory has good agreement with the experiment and overseas report. A blade method to measure the laser spot is given in this paper with validation and error analysis. The plasma threshold of metals in atmosphere and water ambients both are diagnosed with the light deflection and piezoelectric transducer. A Q-switched pulsed Nd:YAG laser operating at infrared (1064nm), visible(532nm) and ultraviolet (355nm) wavelengths has been used. Al、Fe、Cu are used as targets and get a similar results with both method. Theoretical and experimental analyses are applied on the influence of wavelength on the threshold have been done, both of which have shown that the plasma threshold of metals decrease as the laser wavelength increases; The plasma threshold of metals are higher in water than in air and the pressure of the shock wave in water is five times higher than in air.

从热传导方程和雪崩电离机制出发，假设当电子增值2~(10)倍时，考虑了温度对材料热力学和光学参数的影响时，得到了气化和等离子体点燃的时间，利用该模型进行计算得到的结果与国内外报道及自行通过实验测得的阈值基本一致；提出了利用刀刃法测量激光光斑面积的方法，并通过实验进行了验证和误差分析；利用光偏转装置和压电换能器分别对空气和水中金属等离子体点燃阈值进行了实验诊断，激光器均为调Q—YAG激光器(波长1064nm，532nm，355nm，脉宽10ns)，靶材分别为Al、Fe和Cu，两种测试方法得到的等离子体点燃阈值基本一致；本文从实验和理论计算两个方面讨论了波长对等离子体点燃阈值的影响，均得到了等离子体点燃阈值随着波长的增加而减小的结论；对空气中和水中不同环境下金属等离子体的点燃阈值进行了比较研究，得到了金属在水中的等离子体点燃阈值比空气中的大，且水中产生的冲击波的压强是空气中的5倍左右的结论。

In his article Looking at China at the Turn of the Century, he pointed out explicitly that, on the threshold of the new century, China is fulfilling her sacred mission, she will march on to the international stage systematically and inclusively with dignity of a contributor and leader. The role China plays is becoming more and more important.

他在《世纪之交看中国》一文中明确地指出，在新世纪的门槛上，中国在完成其神圣的历史使命，将以贡献者及领导者的身份，系统地、全面地进入国际舞台中国所扮演的角色将越来越重要。

Base on the threshold voltage model presented, an intrinsic drain current model in strong inversion region is developed, which can describe the short-channel effects such as DIBL and charge-sharing effect well, and give special considerations for mobility, velocity saturation, channel length modulation and quantum effect. Based on the front interface surface potential model, a formula of unified inversion charge is derived, and an intrinsic drain current model in middle inversion region is developed.

利用所提出的深亚微米FD器件正、背界面表面势模型，建立了一个能够完整描述深亚微米FD器件本征亚阈漏电流特性的模型，能够准确地描述DIBL效应和背沟道漏电效应；利用所提出的阈值电压模型，建立了深亚微米全耗尽器件的本征强反型电流模型，很好地描述包括DIBL效应、电荷分配效应在内的小尺寸效应，对迁移率、速度饱和效应、沟道长度调制效应和量子效应进行了特别的考虑；利用所提出的深亚微米FD器件正界面表面势模型，推导了统一反型层电荷公式，建立了深亚微米FD器件的本征中反型漏电流模型。

Enjolras felt attacked by that impatience which seizes on strong souls on the threshold of redoubtable events.

在这时，正如那些面临险境性格顽强的人那样，安灼拉感到自己有些急躁。

In order to obtain high LIDT antireflective coatings on the nonlinear optical crystal LiB3O5, this dissertation focuses its main interests on the following four aspects: Firstly,frequency doubling and tripling AR coatings were designed on the LBO crystal using vector addition method.

本文围绕提高非线性光学晶体LiB3O5上增透膜的激光损伤阈值(laser induced damage threshold， LIDT)，这一中心问题，主要开展了四方面的工作。

Www.buffettism.com 巴菲特研究中心 Research Centre for Buffettism avoiding dumb decisions, rather than by making brilliant ones. Since September 11th, Ajit has been particularly busy. Among the policies we have written and retained entirely for our own account are (1)$578 million of property coverage for a South American refinery once a loss there exceeds $1 billion;(2)$1 billion of non-cancelable third-party liability coverage for losses arising from acts of terrorism at several large international airlines;(3)￡ 500 million of property coverage on a large North Sea oil platform, covering losses from terrorism and sabotage, above ￡600 million that the insured retained or reinsured elsewhere; and (4) significant coverage on the Sears Tower, including losses caused by terrorism, above a $500 million threshold. We have written many other jumbo risks as well, such as protection for the World Cup Soccer Tournament and the 2002 Winter Olympics. In all cases, however, we have attempted to avoid writing groups of policies from which losses might seriously aggregate.

In assessing the soundness of their reinsurance protection， insurers must therefore apply a stress test to all participants in the chain， and must contemplate a catastrophe 17 自从 911 事件发生之后，Ajit 就变得异常忙碌，在我们承接且全部自留在公司帐上的保单，主要有(1)南美洲炼油厂损失超过 10 亿美元以上的 5.78 亿美元意外险(2)数家国际航空公司 10 亿美元恐怖份子攻击事件不得撤销第三责任险(3)北海原油平台 5 亿英镑恐怖份子攻击及恶意破坏的产物意外险，以及超过 6 亿英镑以上业者自留或再保损失(4)芝加哥 Sears 大楼恐怖份子攻击事件超过 5 亿美元以上的损失等；此外我们也接了许多项超大型的意外险，例如世界杯足球赛以及 2002 年冬季奥运等，但不论是那一件个案，我们都尽量避免会发生连锁反应大量累积损失的保单，比如说，我们不会一口气接下位于同一个大都会的办公及住宅大楼大量的意外险，除非排除核子爆炸及后续可能引发的火灾损失。

The plasma ignition threshold of metal is got through experimental and numerical study. The vapour and plasma ignition times of the target are got based on the equation of heat conduction and cascade model. We suppose that the plasma is ignited when generations of new electrons are born in vapour generation time. The influence of temperature on the thermodynamics and optics parameters of material also have been considered in the model. The resulting theory has good agreement with the experiment and overseas report. A blade method to measure the laser spot is given in this paper with validation and error analysis. The plasma threshold of metals in atmosphere and water ambients both are diagnosed with the light deflection and piezoelectric transducer. A Q-switched pulsed Nd:YAG laser operating at infrared (1064nm), visible(532nm) and ultraviolet (355nm) wavelengths has been used. Al、Fe、Cu are used as targets and get a similar results with both method. Theoretical and experimental analyses are applied on the influence of wavelength on the threshold have been done, both of which have shown that the plasma threshold of metals decrease as the laser wavelength increases; The plasma threshold of metals are higher in water than in air and the pressure of the shock wave in water is five times higher than in air .

从热传导方程和雪崩电离机制出发，假设当电子增值210倍时，考虑了温度对材料热力学和光学参数的影响时，得到了气化和等离子体点燃的时间，利用该模型进行计算得到的结果与国内外报道及自行通过实验测得的阈值基本一致；提出了利用刀刃法测量激光光斑面积的方法，并通过实验进行了验证和误差分析；利用光偏转装置和压电换能器分别对空气和水中金属等离子体点燃阈值进行了实验诊断，激光器均为调Q－YAG激光器（波长1064nm，532nm，355nm，脉宽10ns），靶材分别为Al、Fe和Cu，两种测试方法得到的等离子体点燃阈值基本一致；本文从实验和理论计算两个方面讨论了波长对等离子体点燃阈值的影响，均得到了等离子体点燃阈值随著波长的增加而减小的结论；对空气中和水中不同环境下金属等离子体的点燃阈值进行了比较研究，得到了金属在水中的等离子体点燃阈值比空气中的大，且水中产生的冲击波的压强是空气中的5倍左右的结论。

I will confess that I was far too much taken up with what was going on to be of the slightest use as sentry; indeed, I had already deserted my eastern loophole, and crept up behind the captain, who had now seated himself on the threshold, with his elbows on his knees, his head in his hands, and his eyes fixed on the water, as it bubbled out of the old iron kettle in the sand.

我得承认，我被正在发生的事情完全吸引住了，压根没起到一个警戒哨的作用；事实上，我已经离开了东边的射击孔，趴在了船长的后面，这会儿他正坐在门槛上，肘拄在膝盖上，用手托着头，注视着从那只旧铁锅底的沙中冒出的水。

Three new median filters are proposed in this paper, such as the effective and non-iterative removal based on the threshold for salt-and-pepper noise from images, non-iterative removal based on the directional information for salt-and-pepper noise from images, an improved anisotropic diffusion based on the median filter.

本文在中值滤波的基础上，提出了三种新的非线性滤波算法，它们是：基于阈值的图像椒盐噪声的非迭代滤除；基于方向信息的图像椒盐噪声的非迭代滤除；改进的基于中值滤波的反扩散。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失