查询词典 diodes

Topics include: properties, preparation, and processing of compound semiconductors; theory and practice of heterojunctions, quantum structures, and pseudomorphic strained layers; metal-semiconductor field effect transistors; heterojunction field effect transistors and bipolar transistors; photodiodes, vertical-and in-plane-cavity laser diodes, and other optoelectronic devices.

主要内容包括：化合物半导体的特性、制备与制程；异质接面、量子结构和假晶应变层的理论与实际应用；金属半导体接面场效电晶体；异质接面场效电晶体以及异质接面双极电晶体；检光二极体、垂直和平面共振腔雷射二极体、以及其他光电元件。

TPA-PPV (M_W of 3000-4000 g/mol) is a good kind of polymeric light-emitting diodes material and has a high photoluminescent quantum yield, we prepared a series of TPA-PPV nanoparticles with diameters ranging from 20 to 100 nm by reprecipitation method.

结果如下： 1、以一种低分子量聚合物绿色电致发光材料TPA-PPV为目标分子，平均分子量为3000—4000，具有很高的荧光量子产率。

Reprecipitation. nanoparticles. size effects. organic light-emitting diodes.

有机超微粒，尺寸效应，自组装，有机电致发光二极管

The results indicate that the PPV oligomer with biphenyl bridge is a cross form between two chains and tortuose derivative in the same chain. It reduces molecular symmetry and weakens %π-π% stacking effect among conjugated molecules in solid. This is perhaps the important factor that light-emitting diodes can increase fluorescence quantum efficiency.

结果表明，联苯桥联后的PPV齐聚物在结构上形成了链间交叉链内扭曲的构象，这种交叉扭曲的构象降低了分子的对称性，减弱了共轭分子在固体中的π-π堆积作用，这可能是减少荧光猝灭效应，提高固体发光器件效率的重要原因。

By adopting ridge waveguide unpumped absorbing region structure and by antireflection coating technology, the superluminescent diodes were fabricated.

采用直波导吸收区而后在器件的出光腔面上镀制抗反射膜的方法制作超辐射发光二极管。

This paper presents theoretical analysis, circuit design of ka band doubler using two beam-lead Schottky barrier diodes as variator.

本文主要阐述了利用反向并联二极管对进行二倍频的原理和利用该原理设计8mm波段二倍频器。

Extensive studies have been made on organic and polymeric light emitting diodes because of their practical application as well as inherent scientific interest. Polymer LEDs using Poly (p-Phenylene Vinylene) were first reported in 1990 by Friend Research group and since then various other kinds of conjugated polymers have been developed which exhibit electroluminescence.

自从1990年英国剑桥大学Friend研究小组用聚对苯撑乙烯制作发光二极管以来，人们对PPV及其衍生物的电致发光性能进行了广泛研究并且取得了很大进展。

Rolls-Royce says that Chinese customers also tend to favor some of its flashier options, such as illuminated hood ornaments, which use light-emitting diodes to draw attention to the 'Spirit of Ecstasy' statuette above the front grille.

劳斯莱斯表示，中国消费者往往也更换喜欢较为时尚的车型，比如闪闪发亮的前盖装饰，这类装饰利用发光二极管，吸引人们注意车头上的&欢庆女神&雕塑。

So gas tube protectors are often equipped with diodes, which clamp the interfering voltage to a safe level until the gas tube ionizes.

因此气体放电管通常还配备了二极管，将外部电压限制在一个安全等级上，直到气体放电管电离。

Some technical problems arose during the debugging of the accelerator. The ion source did not produce arc. The accelerator tube cracked. The control system was out of order. The transporting capacity of the charge belt degraded. The corresponding reasons were analyzed and some measures were adopted to solve the problems. The drawing voltage was raised to its predetermined position after the ion source produced arc and should be reduced to zero before turning off the accelerator. Transition flange was lathed and the accelerator tube was re-assembled. The control equipment at high voltage was shielded. TVS diodes were installed at the input and output ends.

调试中出现了离子源不起弧、加速管破裂、控制系统失灵和输电带输电能力降低等技术问题，分析了出现这些问题的原因，然后分别采取了相应的措施加以解决：变换工作流程，在每次关机前先把引出电压降为零，开机时等离子源起弧后再把引出电压升到预定值；对过渡法兰进行车加工，重新封装；对高压端的控制设备采取屏蔽措施，在输入、输出端使用TVS二极管，对控制软件进行抗干扰设计；对绝缘气体进行循环干燥等。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷