查询词典 hydrogen fluoride

The binding of different halide anions to four strapped calix[4]pyrroles was studied by means of molecular mechanics and molecular dynamics simulations methods. The results indicate that the anion binding ability of calix[4]pyrrole-type systems could be effectively tuned by modifying the length and nature of the bridging straps. In this process, it was the most stable conformation upon anion binding due to the formation of four NH\|halide hydrogen bond, simultaneity, the difference of cavity by modifying straps adapted themselves to different halide anion.

模拟结果表明，加入带状修饰链和调节链长可以增强对某种特殊卤素阴离子的识别，在这个过程中，卤素阴离子与杯[4]吡咯NH上的氢形成的多氢键使主体分子与阴离子形成稳定复合物，同时带状修饰链通过改变杯吡咯空腔大小影响主体分子与卤素阴离子的氢键相互作用，从而调节了对不同阴离子的识别能力。

In this paper, a turbostratic CN precursor was prepared by means of pyrolysis of melamine, then it was treated by high temperature and high pressure. The pyrolysis process of melamine, mechanism of hydrogen elimination and the effect of catalysts on pyrolysis of melamine were studied. The crystal structures, bonding states and chemical compositions of CN precursor obtained by pyrolyzing melamine are analyzed by X ray diffraction, burning spectrum, scanning elecron microscope and Fourier transform infrared Spectroscopy.

本文采用三聚氰胺热解法制备了乱层石墨结构的碳氮前驱物并进行了探索性的高温高压实验；研究了三聚氰胺热解的工艺、去氢机理以及催化剂对三聚氰胺热解过程的影响规律；借助 X 射线衍射、燃烧谱、透射电镜和红外光谱等手段，对获得的碳氮前驱物进行了成分、晶体结构、价键结构的分析。

The protostar develops into a full-fledged star powered by thermonuclear fusion of hydrogen and other light elements in its core.

原恒星在热核聚变的作用下最终成为一颗完全发育的恒星。

Is attributed to the lifetime of positrons trapped at the hydrogen bubble.

实验结果表明，氢脆的微观机理是氢气泡致脆。

There exist not only distinct differences in the hydrogen and oxygen isotope composition between the A-type granites of different pluton in eastern China, but also large variations in single plutons.

中国东部A型花岗岩不仅不同岩体之间氢氧同位素组成明显不同，而且同一个岩体内部也存在较大变化。

Hydrogen peroxide;titanium potassium oxalate;acidic dye;Fenton system

TQ425；TQ085 A 1005-829X(2008)11-0072-03 H2O2；草酸钛钾；酸性染料；Fenton体系

The effects of initial concentration of the phthalates and hydrogen peroxide,the time of UV radiation and pH on the degradation process are reported in order to provide the necessary basis for practical application of this method.

对邻苯二甲酸酯及H2O2的初始浓度、光照时间及pH值等因素对降解过程的影响进行了研究，以期为该方法的实际应用提供必要的基础。

For the first three months of pregnancy, women should try to avoid perming hair, perming agents due to the nitro-containing compounds and alkaline hydrogen peroxide; especially hair dyes containing nitro-, amino-aromatic compounds, may affect fetal development, resulting in severe fetal deficiency occurred.

对于怀孕头三个月的妇女，应尽量避免烫发染发，因烫发剂中含碱性的硝基化合物和过氧化氢；特别是染发剂含有硝基、氨基的芳香族化合物，会影响胎儿的发育，严重的导致胎儿发生缺陷症。

Permethrin into hydrogen as an example.

以氢成菊酯为例。

Dr Tom Delay, the third panellist and chief executive of the Government-funded Carbon Trust, believes that hydrogen is the way forward and may become the dominant fuel.

政府投资的碳托拉斯第三专门小组成员和总经理汤姆·迪莱博士认为，氢很有前途，而且可能成为占统治地位的燃料。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48