查询词典 ultraviolet rays

Afterwards they were cultivated in Petri dish in the constant temperature incubator in Knop until the length of epicotyl of broad bean was perhaply 3 cm that could be treated by ultraviolet B radiation.

当蚕豆的上胚轴长到大约 3cm时，在光背景为 70μmol· m- 2 · s- 1条件下，分别用 1 。0 2、3.0 3、4.52 k J· m- 2 的 UV- B辐射蚕豆的上胚轴 7h。

A program in EPROM is erase the module to ultraviolet light.

在EPROM 里的程序可以用紫外线擦除。

The latter type PROM is also known as an EPROM because it can be erased by ultraviolet light and reused.

后一种类型的PROM也称为EPROM，因为它可以用紫外光擦除其内容后重新使用。

My company professional develop natal LED series illumination product adopt high-test LED chip and pc kuan timber, Resistance to impact, resist ageing, prevent ultraviolet, age long, conserve energy, color and lustre beautiful, performance equability, low loss, low maintain, is new generation green the illumination of environmen tal protection product.

我公司专业研发生产的LED系列灯饰产品采用优质的LED芯片及PC管材，抗冲击、抗老化、防紫外线、寿命长、节能、色泽鲜艳、性能稳定、低损耗、低维护，是新一代绿色环保的灯饰产品。

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。

A crystalline sterol, C28H43OH, synthesized by yeast from sugars or derived from ergot and converted to vitamin D2 when exposed to ultraviolet radiation.

麦角甾醇结晶甾醇，C28H43OH，由糖中的酵母合成或由麦角提炼而成，当受紫外线照射时可转化成维生素D2

Ultraviolet mutation was employed to screen resistant mutants to esculin ; on the basis,using the uniform design to optimize the ferment medium.

方法采用紫外线诱变处理，对大量抗七叶苷突变株进行初筛、复筛；在此基础上，利用均匀设计方法对发酵培养基成分进行优化组合。

Ultraviolet does a great harm to cells as an external factor that causes cell division.

紫外线是一种外源性的促细胞分裂剂，对细胞有很大的损伤作用。

Ultraviolet radiation increases the risk of cataracts, which cloud the lens of the eye and can cause blindness.

紫外线辐射增加了白内障的危险，这种疾病使眼睛的晶体蒙上缀障并能导致失明。

It is concluded, that the E2 layer is a normal layer, controled purely by solar ultraviolet radiation; the annual variation of the solar height at the time of first ionization of the E2 layer is irregular, whereas this solar height of the F layer has a regular annual variation.

可以确认，E2层是一个純受太阳紫外輻射所控制的正常层次；該层每天开始电离时的太阳高度年变化是沒有規律的，而F层每天开始电离时的太阳高度却具有有規律的年变化。

Pradeep Indulkar, a senior official at the Maharashtra state Home Ministry say 101 human were killed and 287 injured.

马哈拉施特拉邦内政部高级官员Pradeep Indulkar称，有101人在冲突中丧生，287人受伤。

Mark Frei, a senior vice president of West, says 80% of West's homeagents have some college education, compared with 30% of those whowork in office-based call centers.

Frei说，该公司80%在家办公的人员都拥有本科学位，而在公司电话中心工作的人中只有30%拥有本科学位。