查询词典 selenium

In 1884, German engineer Nipkow the use of selenium photocell invented a mechanical scanning device that was early in the television system has been applied to the mechanical scanning system in 1939 be eliminated.

1884年，德国工程师尼普科夫利用硒光电池发明了一种机械扫描装置，这种装置在后来的早期电视系统中得到了应用，到1939年机械扫描系统被淘汰。

As one spoke into the photophone, the illuminated diaphragm vibrated, casting various intensities of light onto the selenium resistor.

当人对着话筒讲话时，光聚焦到的震动片随之震动，从而把各种强度的光波投射至硒光敏电阻器。

Inductively coupled plasma optical emission spectroscopy was proposed for the determination of selenium,plumbum,cadmium in human hair ,and two different preparing methods were compared.

采用电感耦合等离子体原子发射光谱测定头发中的硒、铅、镉含量，并采用两种不同的前处理方法进行比较。

Tentativea analysis trace selenium in radix puerariae and its soil property by microwave digesion-single sweep polarograph

采用微波消解单扫描极谱法测定了葛根及其种植土壤中微量硒的含量，并做了初步分析，为葛根产品的研发提供重要依据，也为进一步开发葛根优良品种和平衡施肥提供科学信息和依据。

One medium portobello mushroom supplies 21 percent of the recommended daily intake of selenium and one third your need of copper; it also has as much potassium as a medium-size banana. Other varieties are just as rich in minerals, a recent analysis found.

最近的一项分析发现：一棵中型波托贝洛蘑菇含有21%的每日摄取的硒和三分之一您需要的铜，和一个同等大小的香蕉含有相同数量的钾，还含有丰富的矿物质。

The company products mainly typewriter ribbon of stylus printer, including the empty shell of typewriter ribbon, develop the stylus printer serial products of typewriter ribbon(Suitable for the ATM machine, cash register, tax person who play series) produce and sell printer ink horn, ink, laser printer regeneration and selenium drum, carbon powder separately.

以生产针式打印机为主，包括色带空壳，开发针式打印机色带系列产品(适用于ATM机，收款机，税控机，高速行打机，微型票打等系列)另生产销售打印机墨盒，碳粉。

Selenium is an important element in the environment ,and it has great influences on the health of propagation.

硒是环境中重要的生命元素，对人和动植物体的健康有重大的影响。

We prepared the pyrethric acid II through four reactions: esterification, oxidation, decomposition, diesterification. And the original synthesis route of the pyrethric acidII was improved: the yield of oxidation of allyl rise through increasing the activity of Selenium dioxide; in the document, tert-butyl-trans -2, 2-dimethy1-3-(2"-methoxycarbony1-1"-propenyl)cyclopropanecarboxy late was synthesized from tert-butyl-trans-2,2-dimethyl-3-(2 -formyl-r -propenyl) cyclopropanecarboxylate with two steps, with low yield.

我们经过酯化，氧化，成双酯，热分解四步反应，成功地得到了第二菊酸，并改进了原第二菊酸的合成路线：通过改变二氧化硒的活性提高了烯丙甲基的氧化产率；将原路线中醛氧化成羧酸、羧酸酯化的两步反应改为醛和甲醇、二氧化锰等作用一步直接酯化的方法，减少了反应步骤，提高了总收率。

Effects of vitamin e and selenium on some rumen parameters in lambs.

日粮中添加硒对山羊瘤胃消化代谢的影响。

Paul Nipkow obtains a patent in Germany for TV, using a selenium cell and a mechanical scanning disk.

保罗·尼普可夫获得德国电视发明专利。他在电视技术中采用硒光电管和机械扫描盘。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。