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   2-二氯乙烷 在 轻工业手工业 分类中 的翻译结果: 查询用时:0.113秒
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二氯乙烷
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    The structure was demonstrated by IR, H 1NMR and element analysis. The absorption wavelength varied from 1052 nm to 1095 nm was tested in the solution of 1,2 dichloroethane.
    结构经红外 ,H1核磁 ,元素分析表征 ,并测量了其 1,2 -二氯乙烷溶液的电子吸收光谱 ,范围在 10 52~ 10 95nm之间。
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    The optimum chlorination condition was:sucrose 6-acetate syrup(20g),Thionyl chloride(20~22ml),1,2-dichloroethane as reaction mediums and refluxed time was 10~11 hours.
    蔗糖6-乙酸酯的最佳氯化条件为:蔗糖6-乙酸酯浆状物20g,吡啶20ml,亚硫酰氯22~22ml,反应介质1,2-二氯乙烷,回流时间10~11h。
短句来源
    A stable laser pulse with a duration of 27~36 ps was observed by using the dyes. The dyes are successfully proved to be used as a collide pulse mode locking (CPM) dye for Nd 3+ ∶YAG lasers.
    它的 1,2 -二氯乙烷溶液对 1.0 6 μm波长的 Nd3 + :YAG激光进行锁模 ,全部锁模成功 ,波形稳定。 脉宽为 2 6 .8~ 35ps。
短句来源
    In order to eliminate physical chelate between lignin and cellulose,the DHPCC was first washed dichloroethaneethanol(2/1,V/V) mixture and urea solution (8M,pH=8.8). Purified lignin-cellulose complexes fraction was obtained. The existence of linkage between lignin and cellulose in this fraction was confirmed by FT-IR and CP/MAS 13 C-NMR spectra.
    对提纯后的共聚产物的化学结构用FT -IR以及CP/MAS13 C -NMR进行表征 ,研究发现 :这种共聚物中的DHP不能被二氯乙烷 -乙醇 (2 /1,V/V)和 8M尿素溶液所溶解 ,在该共聚物中具有典型的纤维素结构 ,又含有芳香族结构 ,说明DHP和微晶纤维素之间能形成化学键的连接
短句来源
    Five organic solvents for extracting were used in the study. Results express that cicetic ether presented the best,crocin :raw material ratio reached 1:3 at extracting temperature of 55℃,and 74.19 mg/100g of met crocin was obtained when extracting time was 5h.
    本试验对丙酮、石油醚、乙酸乙酯、1,2-二氯乙烷5种有机溶剂提取番茄红素的效果进行了比较,结果表明,以乙酸乙酯作为提取溶剂时的提取效果最好,提取温度为55℃,pH值为8,物料比为1:3,提取时间为5h,其提取的番茄红素含量达74.91mg/100g。
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A colorimetric method is described for the determination of micro-nitrile compounds in the grains. The method is based on measurment of color formed when the nitrile compound and methylene blue mixed with 0.3% sulfur-dichloro ethane, read absorbance of reaction product at 660nm. Recovery experiment were made in the grains.

微量氰化物的测定,常用的方法有比色法;容量法;离子选择电极法及气相色谱法等多种方法。容量法:离子选择电极法及气相色谱法因灵敏度低或需要特殊仪器,所以目前微量氰化物的定量还普遍采用比色法。粮食中氰化物的定量,国家的标准方法仍采用吡啶盐酸联苯胺比色法。由于吡啶毒性大,并且具有分析人员不能接受的恶臭,联苯胺又系致癌物质。所以为了取代该法,我们参照康、智三等报道将氰化物和亚甲篮混合溶液加入硫磺二氯乙烷溶液振荡混合时,氰化物与硫磺反应定量地生成硫氰酸根离子后和亚甲篮以离子对的形式被二氯乙烷溶液提取。其有机相在660毫微米波长下测定吸光度而对氰化物进行定量的方法,用于粮食中氰化物的定量获得了满意的结果,故介绍如下。

Based oa the nature of 2.6-dichorophenol indopheol that dissolved in organic sovent an which 1.2-dichloroethane was used ascorbic acid content to determined by 2.6-dicaorophenol indopheol titration. As soon as reduced ascorbic acid was depleted, extra distilled 2.6-dichorophenol indopheol dispersed the organic layer and became pink. Distilled off can be decided by the colour change of organic. It's simple way to solve the problem that 2 .6-dechorophenol indopheol can not use to determine the asetobic acid content...

Based oa the nature of 2.6-dichorophenol indopheol that dissolved in organic sovent an which 1.2-dichloroethane was used ascorbic acid content to determined by 2.6-dicaorophenol indopheol titration. As soon as reduced ascorbic acid was depleted, extra distilled 2.6-dichorophenol indopheol dispersed the organic layer and became pink. Distilled off can be decided by the colour change of organic. It's simple way to solve the problem that 2 .6-dechorophenol indopheol can not use to determine the asetobic acid content of the colured fruits, vegetables and their products. Above-mentioned way, the ascorbic acid content of black currant was determined succesfully. compared 1 % oxalic acid with 1.5M acetic acid as aseorbic acid extractant to affcet results of determined aseorbic acid content, 1 . 5M acetic acid was better than 1 % oxalic acid, especially the samples which conteined the high level of iron ion.

为解决2.6—二氯酚靛酚滴定法不适用于有色果蔬及其制品中的抗坏血酸测定问题,利用2.6—二氯酚靛酚溶于有机溶剂的特点,以1.2—二氯乙烷做有机溶剂,用2.6—二氯酚旋酚滴定抗坏血酸,当还原型抗坏血酸消耗殆尽,多滴入的2.6—二氯酚靛酚就会进入有机层呈粉红色,观察有机层的颜色变化来判定终点,用此法测试了黑加伦及其制品中的抗坏血酸含量,获得了满意的结果。

Six pentamethylidene IR dyes with a peak absorption wavelength at 1.06 μm (including two asymmetric dyes) were synthesized for a mode locking laser. The structure was demonstrated by IR, H 1NMR and element analysis. The absorption wavelength varied from 1052 nm to 1095 nm was tested in the solution of 1,2 dichloroethane. A stable laser pulse with a duration of 27~36 ps was observed by using the dyes. The dyes are successfully proved to be used as a collide pulse mode locking (CPM) dye for Nd 3+ ∶YAG...

Six pentamethylidene IR dyes with a peak absorption wavelength at 1.06 μm (including two asymmetric dyes) were synthesized for a mode locking laser. The structure was demonstrated by IR, H 1NMR and element analysis. The absorption wavelength varied from 1052 nm to 1095 nm was tested in the solution of 1,2 dichloroethane. A stable laser pulse with a duration of 27~36 ps was observed by using the dyes. The dyes are successfully proved to be used as a collide pulse mode locking (CPM) dye for Nd 3+ ∶YAG lasers.

合成了 6个最大吸收波长在 1.0 6 μm附近的五甲川红外染料 (两个为不对称结构 )。结构经红外 ,H1核磁 ,元素分析表征 ,并测量了其 1,2 -二氯乙烷溶液的电子吸收光谱 ,范围在 10 52~ 10 95nm之间。它的 1,2 -二氯乙烷溶液对 1.0 6 μm波长的 Nd3 + :YAG激光进行锁模 ,全部锁模成功 ,波形稳定。脉宽为 2 6 .8~ 35ps。

 
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