查询词典 phosphorus

The bromo-polyethylenegylcol-monomethacrylate was synthesized by two steps. Firstly, methylacrylic acid was esterified with polyethylene glycol (PEG, M=200, 400) to give polyethyleneglycol-monomethacrylate Secondly, treatment of PEG-MA with phosphorus tribromide gave the aim product.

以聚乙二醉（M分别为200，400）和甲基丙烯酸进行单酯化反应，所得单酯再与三溴化磷进行溴化反应合成了一种新的两端具有功能团的不饱和溴化物，即溴代甲基丙烯酸单聚乙二醇酯。

Pentanediol reacted with phosphorus tribromide to make it mono-bromination, under the catalytic action of PPTs it reacted with 2,3-dihydropyran to protect another hydroxy group, then to react with triphosphine, produced quarterphossal.

再以1，5-戊二醇为原料，三溴化磷使之单溴代，得到5-溴-1-戊醇，在对甲苯磺酸吡啶盐的催化下与2，3-二氢吡喃反应保护其另一端的羟基，与三苯基膦反应生成季磷盐。

Two types of P Br N contained flame retardant,O (2,4,6 1 trioxo 1 oxyphosphabiscyclooctane 4 methylene) O (2,3 dibromopropyl)phosphoric melamine salt and O (2,4,6 tribromophenyl)phosphoric melamine salt,were synthesized from phosphorus oxychloride,pentaerythritol,2,3 dibromopropanol,2,4,6 tribromophenol and melamine,etc.

以三氯氧磷、季戊四醇、2 ，3 二溴丙醇、2 ，4，6 三溴苯酚及三聚氰胺等为原料合成了两种含磷溴氮阻燃剂，即O (2 ，4，6 三氧杂 1 氧基磷杂双环 [2 。2 。2 ]辛烷 4 亚甲基) O 2 ，3磷酸三聚氰胺盐和O (2 ，4，6 三溴苯基)磷酸三聚氰胺盐。

Triethanolamine was considered as a desirable complexing agent to reduce phosphorus content in electroless nickel deposits applied on polyurethane foam substrate.

对于以聚氨酯海绵为基体的化学镀镍，研究认为，三乙醇胺是较好的选择。

A phosphorus-containing triazine oligomer was synthesized from triethyl phosphite, cyanuric chloride ,pentaerythritol and morpholine through three steps.

以亚磷酸三乙酯、三聚氰氯、季戊四醇和吗啉为原料，经3步反应合成了含磷三嗪环低聚物，考察了反应条件对中间体及产物收率的影响，对中间体及产物的结构和热性能进行了表征。

Through Friedel-Crafts reaction, We have prepared highly purified triphenylphosphine sulfide by using benzene, phosphorus trichloride, sulfur, and aluminum trichloride, which is desulfurized with metal powder to produce triphenylphosphine.

实验方法为以苯、三氯化磷、硫和三氯化铝为原料，利用Friedel-Crafts反应，合成三苯基硫膦，收率为79.4％；然后用金属将三苯基硫膦还原制得三苯基膦，收率为80％。

PHOSPHORUS TRISULPHIDE, free

三硫化二磷，不含黄磷和白磷

Potato is a kind of potassium crop, which has great demand for nitrogen and potassium. The demand of phosphorus is little, yet it could promote the vegetative growth, tuberization and starch accumulation.

马铃薯是喜钾作物，对氮、钾需求量较大，对磷需求量虽然较少，但磷可促进营养生长和块茎形成以及淀粉积累。

The performance of Hygrophila pogonocalyx Hayata of treating BOD, nitrogen, and phosphorus is better than Typha orientalis Presl.

大安水簑衣在BOD和氮磷的去除效果上比香蒲要来的好。

The 0-40cm soil layer soil mean value looked that mixes by the interlacing broadcasts the lawn soil ulmin, the alkaline hydrolysis nitrogen content to be highest; The fast-acting phosphorus, the fast-acting potassium are highest by the unicast awnless brome lawn content; The colleague mixes broadcasts lawn pH to be biggest.

不同播种方式下土壤有机质、碱解氮、速效磷含量在0-40cm各土层内呈现随着土层深度的增加而降低的趋势，均以0-10 cm土层土壤含量为最大；同行混播和隔行混播草地速效钾呈现降低的变化趋势，单播无芒雀麦草地则呈现先降后增再降的变化趋势，以0-10 cm和20-30 cm土层土壤含量为最大，均为80，并与其它土层间达到极显著差异；pH则呈现出增加趋势。0-40cm土层土壤平均值来看以隔行混播草地土壤有机质、碱解氮含量最高；速效磷、速效钾以单播无芒雀麦草地含量最高；同行混播草地pH最大。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。