samarium [sə'mɛəriəm]

samarium的基本解释

n.

钐, 一种稀有金属元素, 符号Sm, 原子序为62

与samarium相关的网络例句 [注：此内容来源于网络，仅供参考]

The chapter two was focused on the samarium diiodide promoted organic reactions and their applications in organic synthesis, firstly, a new synthesis of highly substituted cyclopentadienes from a,β-alkynone promoted by samarium diiodide was investigated and the highly substituted cyclopentadienes were prepared in moderate to good yields under mild conditions. Secondly, the Michael addition and Michael-aldol tandem reaction of diorganyl diselenides or diorganyl disulfides with α,β-alkynones mediated by samarium diiodide were studied and a series of alkenylsulfides and alkenylselenides were prepared in good yields. Then the highly regioselecfive nucleophilic addition of the allylsamarium bromide to α,β-alkynones were explored. We found that the allylsamarium bromide reacts with α,β-alkynones to afford regiospecificly 1. 2-nucleophilic addition products in good yields under mild condition. At last we studied the coupling reaction of aryl halides promoted by NiCl〓/PPh〓/Sm〓.

第二章 研究了二碘化钐、金属钐促进的有机反应：1、二碘化钐促进下α，β-炔基酮的偶联环化反应，提供了一种制备多取代环戊二烯的新方法；2、二碘化钐促进下的二硫醚、二硒醚与α，β-炔基酮的Michael加成反应，为高产率地制备多取代的烯基硫或烯基硒化合物提供了方便可靠的新方法；3、二碘化钐促进下的二硫醚、二硒醚与α，β-炔基酮和醛、酮的Michael—aldol串联反应，提供了一种一锅法高产率地制备多取代的含硫的烯丙基醇或含硒的烯丙基醇类化合物的方便可靠的原子经济性的新方法；4、烯丙基溴化钐与α，β-炔基酮的高度区域选择性的1，2-亲核加成反应；5、NiCl〓/PPh〓/Sm〓促进的卤代芳烃的偶联反应-一种从各种卤代芳烃制备联苯类化合物的有效方法。

Methods Samarium nitrate was administrated to mice at different doses (0,5,50,500,2000mg/L) for 90d.The contents of samarium and trace elements in testicle were observed.

110只雄性ICR分为5组，小鼠分别自由饮用0，5，50，500和2 000mg/L的硝酸钐水溶液90d，测定睾丸内钐和微量元素含量的变化。

Samarium Cobalt, Alnico mainly used in instruments and meters, electrical as well as some of the work environment has special requirements for mechanical equipment.

钐钴，铝镍钴主要用于仪器仪表，电机以及一些对工作环境有特殊要求的机械设备上。

与samarium相关的网络解释 [注：此内容来源于网络，仅供参考]

samarium：钐

德国科学家在由钐(samarium)、钡(barium)、铜、氧所组成的高温超导体中,发现了类似奈米条带(nanostripe)的结构. 许多物理学家相信这类结构是超导体传导电流却没有电阻的原因,但也有人不以为然. 这些新发现不紧重启高温超导体的争论,

samarium：钐(Sa)(金属元素)

盐浴淬火 salt bath quench | 钐(Sa)(金属元素) samarium | 抽样 sampling

samarium：釤 钐

61 Pm 鉕 钷 Promethium | 62 Sm 釤 钐 Samarium | 63 Eu 銪 铕 Europium

samarium：钐 (名)

Samaritan 撒马利亚的 (形) | samarium 钐 (名) | samba 桑巴舞曲; 桑巴舞 (名)

samarium poisoning：钐中毒

samarium 钐 | samarium poisoning 钐中毒 | samarskite 钶钇矿