查询词典 impurity

When a donor or an acceptor impurity is added to a semiconductor, we say that the material has been "doped".

当半导体中加入了施主感受主杂质，我们就说该物质"掺杂"了。

In the research of prescription, through the experiments we knew the influence from the Nb_2O_5 or Y_2O_3 single donor doped on high-temperature PTC ceramic, and got the curve graph drawing the resistivity and mixing quantity. In order to restrain lead volatilize and mix the rang of donors to neutralization the harmful acceptor impurity in raw materials, adopt the prescription design of Nb_2O_5 and Y_2O_3 double donors-doped. From the result, we know that regulation proportion of Nb , Y double donors, can make high-temperature PTC ceramics semiconducting, the pottery demonstrates good electric performance.

为了能够更有效的抑制铅挥发，并且使掺杂范围能够更好的调节，以"中和"原材料中的有害受主杂质，在配方设计中采用了Nb_2O_5和Y_2O_3双施主掺杂的配方，由结果可知，适当的调节Nb、Y双施主掺杂总量及Nb、Y掺杂比例，可以使高温PTC陶瓷充分的半导化，陶瓷表现出良好的电性能。

Will not adsorb any impurity in the conveyor belt surface.

更不会吸附任何杂质于输送带表面。

The control of the aging condition, the transient liquid- solid separation of aging slurries, and the analysis of the particle size distribution of CTA and the micro concentration determination of the impurity 4- CBA.

粗对苯二甲酸的高温熟化是一个复杂过程，动力学实验研究的难点在于3个方面，即反应条件的控制，熟化浆料在高温高压下的液固瞬间分离取样与样品的分析测试。

The mechanism of colouration by irradiation of topaz is also discussed here, suggesting that the colour is induced by integrated effect of impurity elements, impurity ion center and electron hole center.

在辐照改色的条件、过程和结果上，众多学者的研究成果基本上是一致的，但在黄玉的赋色

With the aid of scanning electron microscope, the experiment was made about how the filter of deposition chamber influences the content of impurity in film and the result of this test showed that the structure, number of filter spacer strongly influences the impurity content of film.

在扫描电镜下观察了沉积腔的过滤对薄膜杂质含量的影响，观察结果表明：过滤挡块的数量、结构对过滤宏观粒子的效率具有很大的关系，当弧形腔中复合挡块数量4块时，在扫描电镜已很难发现有宏观粒子。

For considering the electron-phonon coupling in the problem of impurity absorption band, a set of normal modes of lattice vibration were formed by the linear combination of plane waves in order to present fully the site symmetry of the impurity.

将晶格振动的平面波线性组合得到一组充分反映杂质格位对称性的正则模。

The invention discloses a high-voltage N-type metal oxide semiconductor, including a P-type substrate, a P-well drift region and an N-type drift region are arranged on the P-type substrate, a P-type contact hole, an N-type source and a field oxide layer are arranged on the P-well, an N-type drain and the filed oxide layer are arranged on the N-type drift region; the invention is characterized in that the thickness a grid oxide layer part which is positioned above the P-well is smaller than the grid oxide layer part which is positioned above the N-type drift region and a thin grid oxide layer and a thick thin grid oxide layer are respectively formed accordingly, a P-type impurity injection region is arranged in the P-well, and the P-type impurity injection region is positioned below the thin grid oxide layer.

本发明公开一种高压N型金属氧化物半导体管，包括P型衬底，在P型衬底上设有P型阱和N型漂移区，在P型阱上设有P型接触孔、N型源及场氧化层，在N型漂移区上设有N型漏及场氧化层，其特征在于位于P型阱上方的栅氧化层部分的厚度小于位于N型漂移区上方的栅氧化层部分并由此分别形成薄栅氧化层和厚薄栅氧化层，在P型阱内设有P型杂质注入区且该P型杂质注入区位于薄栅氧化层的下面。

A three layers BP neural network model for the corrosion weight-loss of the gas turbine wheel part in heavy oil impurity environments was set up by using Nimonic 80A corrosion weight-loss data in the different heavy oil impurity environments, and the influence law of the gas turbine wheel part corrosion weight-loss was predicted.

利用三层BP神经网络，根据已有的镍基合金（Nimonic 80A合金镍基沉淀硬化）在不同重油杂质环境参数下的腐蚀速度数据，建立了燃气轮机的涡轮部件在重油杂质环境中腐蚀失重的人工神经网络模型，并进一步预测了腐蚀失重。

For a given temperatures the mobility decreases with increasing impurity concentration because of enhanced impurity scatterings.

例如样品掺杂浓度为时，在一定的温度，迁移率随着杂质浓度提高而下降，因为杂质散射增强了。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐