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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。

Under certain conditions, the equilibrium density of predators increases with the refuge use by prey population, too.

捕食者的平衡密度在一定条件下也随着庇护所效应的增强而增加。

Japan, 1985, the commercial land price index for Tokyo, 120.1 (1980 to 100), 1988 rose to 334.2, In the short three years rose by nearly 200%, of which the Central District premium increases threefold. In 1990, only Tokyo premium equivalent to the United States on national land prices and created an unprecedented real estate bubble in the world, to sow the seeds of the Japanese economy.

据日本国土厅公布的数据，1985年，东京的商业地价指数为120.1（1980年为100），到1988年就暴涨到了334.2，在短短的3年间暴涨了近两倍，其中中央区地价上涨了3倍。1990年，仅东京都的地价就相当于美国全国的土地价格，制造了世界上空前的房地产泡沫，给日本经济埋下祸根。

Recently, the drug resistance of Hp is more and more serious, and the failure rate of classical triple therapy for eradiation increases yearly.

抗菌药胃内转运具有特殊的药代动力学特点，存在胃内直接分布及肠道吸收后由血转运至胃组织的跨膜转运。

Analysis of the personage inside course of study says, wo Erma increases the 10 thousand need that buy the home to buy vast land, need buys a lot of equipment, need a lot of storage, and it is OK to clean out treasure to need to add a computer only.

业内人士分析称，沃尔玛增加一万买家需要买巨大的地，需要买很多的设备，需要很多的仓储，而淘宝只需要增加一台电脑就可以了。

As speed increases, the American Eskimo Dog will single track with the legs converging toward the center line of gravity while the back remains firm, strong, and level.

随着速度增加，美国爱斯基摩犬趋向于单一轨迹，由于地心引力的作用，四肢向身体中心线聚拢，背部保持稳固、强健和水平。

The protesters won that round, as Esso quickly rescinded the increases.

由于「埃索」石油公司迅速收回涨价的决定，抗议群众因此赢得这一回合的胜利。

This is a question many people are trying to answer as demand for ethanol increases.

这是许多人在酒精需求量增加的情况下试图回答的一个问题。

In the science of ethology, and more generally in the study of social evolution, altruism refers to behavior by an individual that increases the fitness of another individual while decreasing the fitness of the actor.

在科学的动物行为学，以及在更广泛的研究中的社会进化，利他主义是指行为的个人，增加了健身的另一个人，同时减少了健身的演员。

It is the alcohol itself (ethyl alcohol, or grain alcohol) and the quantity consumed that increases breast cancer risk.

它是酒精本身和数量消耗，增加患乳腺癌的风险。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了