硼

Their structures were confirmed by IR, and the properties of these surfactants such as acid number, interfacial tension, and critical micelle concentration and so on were studied.

通过红外光谱确定了产物的结构，并对有机硼表面活性剂的酸值、表面张力以及临界胶束浓度等性能进行了研究。

The temperature difference between before and after mixtur e of adsorbent and adsorbate could be measured.

为了解决2种溶液在混合前温度不易相等的问题而设计的双温度计法，可以快速测定2种溶液混合前后温度差值，并将这一新方法用于衡量锰、铝、铁水合氧化物在吸附溶液硼时所产生的热效应。

When adulterated with boron atoms the electric resistance of diamond will drop and it will become a kind of semiconductor.

当金刚石中掺入硼原子后可使其电阻率下降，成为典型的半导体材料。

Keywords: Afterburning Efficiency;Solid Ducked Rocket;numerical simulation;Boron;Solid Propellant

中文关键词：二次燃烧效率；固冲发动机；数值模拟；硼；固体推进剂

The superfine boron powder was coated by aggradation method with AP using methanol or acetone as the solvent.

采用沉积法，以甲醇、丙酮为溶剂，AP为主要原料，对超细硼粉进行包覆。

Through the in-situ reduction with KBH_4, a series of the silver(0)-alkylamine complexes has been obtained, the special structure and morphology of such kind of complexes will find wide application in the construction of catalysis, photonic or electronic materials.

通过硼氢化钠还原后，获得了系列以金属银为层板的海面状复合物，具有特殊结构的该类化合物可能在催化，光电材料等领域具有广泛的用途。

We have shown that it is possible to create a radioactivity characterized by the emission of positive or negative electrons in boron and magnesium, by bombardment with alpha rays.

我们已经展示了人工放射现象的可能性，这种放射现象的特征是用以射线轰击用咄硼和镁中的正电子或负电子。

Then Doripenem came into the market in the July ,2005. We studied the synthesis of Doripemen.Firstly, we synthesized the chemical 2 from the starting material------o-hydroxylphenylacylamine through Reformastky reaction, alkylation, Diekmann reaction, enolization, esterification and etc. Secondly, we synthesized the chemical 3 from L — hydroxylproline through the protection of carboxyl, amidogen and hydroxyl group, reduction by NaBr, SN_2 substitution and Mitsumobu reaction.

我们以水杨酰胺为起始原料，经Reformatsky反应、烷基化、Diekmann环合、烯醇化、酯化等反应合成双环母核2；再从L-羟基脯氨酸出发，经酯化保护羧基、保护氨基、保护羟基、硼氢化还原酯得醇、Sn2取代和Mitsumobu反应等合成巯基侧链3；最后由化合物3经脱保护、水解得硫醇，和化合物2在二异丙基乙基胺的作用下缩合，最后Pd／C催化脱保护，历经16步反应最终得到产物多尼培南。

Coal humic acid, boron, ammonification, nitrification, phosphorus availability

煤炭腐植酸，硼，氨化作用，硝化作用，磷有效性

Inorganic agents such as sodium bicarbonate, ammonium carbonate and sodium boron hydride generate gas slowly and the gas produced by these agents is generally difficult to control.

无机物质如碳酸氢钠，碳铵和钠硼氢化物气体产生缓慢，所产生的沼气，这些代理商通常很难控制。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。