氟

perfluorooctanoic acid, with surface waterproof, heat-resisting and antioxidative properties, is a kind of organic acid in the perfluorinated chemicals,and it is also the original material of polytetrafiuoroethylene.

全氟辛酸是全氟化合物中的一种有机酸，是聚四氟乙烯化工产品的原材料，有独特的表面防水活性，耐高温抗氧化。

DISCUSSION: This adverse drug reaction is thought to be a pharmacodynamic additive effect among fluoxetine, imipramine, and levofloxacin.

讨论：这种药物不良反应被认为是在左氧氟沙星、丙咪嗪和氟西汀之间产生的药效上的附加效应。

Therapy included intravenous levofloxacin 500 mg every 24 hours and ceftriaxone 2 g every 24 hours, along with her medications upon admission, including imipramine 50 mg at bedtime and fluoxetine 10 mg/day.

治疗包括每24小时静脉注射500mg左氧氟沙星和2g的头孢三嗪，在允许的情况下伴随她的药物治疗，还包括睡前50mg的丙咪嗪和日服用10mg的氟西汀。

In Chapter III, Fluoroalkylated triazo-compounds (RFCH2N3) were synthesized from fluoroalkylated alcohols (RFCH2OH), which were synthesized from fluoroalkylated iodides.

在第三章里，我们以全氟碘代烷RFI为原料制备得到结构为RFCH2OH长碳链的醇，进一步合成结构为RFCH2N3的氟烷基叠氮化合物。

Calcium carbide residue and inferior iron sulphate were employed as defluorider to treat fluoride wastewater in power plant by chemical deposition, complexation and coagulation.

采用电石渣和硫酸亚铁作为除氟剂，通过化学沉淀、络合、絮凝反应处理热电厂含氟废水，在药剂投加量、投加顺序、静置沉淀时间等方面进行了深入研究。

Through the processes of grinding bastnaesite ore concentrate, mixing the ore powder with NaCO3 in the ratio of 1 to 0.1-0.4, roasting the mixture at 400-800 deg.c for 1-6 hr, elution of the roasted sand with hot water to obtain NaF, drying filtered drag after eluting NaF and mixing the dried drag with ammonium chloride, roasting the mixture at 300-600 deg.c for 1-3 hr, hot water soaking to obtain rare earth chloride solution, extraction with 20% kerosine solution of naphthenic acid, and hydrochloric acid counter extraction to obtain rare earth chloride product.

本发明涉及一种氯化铵法从氟碳铈精矿提取氯化稀土的方法，首先将氟碳铈原精矿磨细，并与NaCO 3 混合，其比例为原矿∶NaCO 3 ＝1∶0.1～0.4，混合均匀后在400℃～800℃焙烧1～6小时，焙砂用热水洗出NaF，洗出NaF的滤渣干燥后与氯化铵混合，于300℃～600℃焙烧1～3小时，再用热水浸取得到氯化稀土溶液，用20％的环烷酸煤油液萃取，再采用盐酸反萃得到氯化稀土产品。

Multiple-paths hydrogen abstraction reactions of fluorine -with CH_3OH have been investigated at the MP2/6-311 ++ g level. The potential energy surfaces for H-abstraction reaction from carbon atom and oxygen atom were given respectively. The results indicate that there is only one minimum energy path for hydrogen abstraction from carbon atom, while multiple paths were found for hydrogen abstraction from oxygen atom. All the stationary structures, frequencies as well as PES sketch of all channels were given, in which the dominant channel is by a five-member ring transition state. The calculated heat of reaction is 170.62 kj/mol for channel 1, 119.41 kJ/ mol for branch channel 6. The results are in good agreement with experimental data.

以MP2/6-311 ++g水平上详细研究了氟原子与甲醇抽氢反应的多通道反应机理，得到了各条通道中涉及的驻点的构型和振动频率及其能量，给出了两张完整的反应势能面，结果表明，氟原子从C原子上抽氢时有一条明显的最低能量通道，而从氧原子上抽氢时要涉及多条分支通道和多个驻点构型，给出了各分支通道势能面示意图，结果表明以形成五元环状过渡态通道为优势通道，计算得到经途径1生成CH_2OH时反应放热170.62kJ/mol，经分支途径6生成CH_3O自由基时反应放热119.4 kJ/mol，此结果与实验值一致。

The chief results were summarized as follows: In the toxicities tests to aquatic animal in the room, the results showed that Deltamethrin and Lambda-cyhalothrin, which the actual toxicities in the 24 hours on fish, loaches and tadpoles all are above 100%, were the most high toxicity, and that Chlorpyrifos and Triazophos, which the actual toxicities in the 24 hours on them are bellow 54%, were the more high toxicity, and that Fipronil and Abamectin were relatively safe, which the actual toxicities in the 24 hours on them are 22%, and that Bisultap was completely safe, which the actual toxicities in the 24 hours on them are bellow 4%.

研究结果表明：溴氰菊酯、高效氯氟氰菊酯对水生动物的毒性最高，对鱼、泥鳅、蝌蚪24h急性毒性都为100％，毒死蜱、三唑磷毒性次之，对鱼、泥鳅、蝌蚪24h急性毒性均在54％之上，氟虫腈、阿维菌素较安全，对鱼、泥鳅、蝌蚪24h急性毒性均在22％之下，杀虫双对水生动物最安全，对鱼、泥鳅、蝌蚪24h急性毒性为4％以下。

It discloses four kinds of diamino monomers such as 1, 4-(4- amnio- 2- trifluoromethyl- phenoxy)- 2-(3'-methyl phenyl)benzene containing fluorine, ether linkage and benzene side chain.

具体公开了四种含氟、醚键和苯侧基的1，4-(4-胺基-2-三氟甲基-苯氧基)-2-(3'-甲基苯基)苯等二胺基单体。

This method should not be limited to the combination of FC-4 with triblock copolymer surfactant, and many mixtures of hydrocarbon and fluorocarbon surfactants can be used if they effectively form a regular mixed micella in solution with suitable interactions between the chosen surfactant and inorganic species.

用氟碳表面活性剂作为&共模板&，使高温合成介孔分子筛成为可能，只要选择合适的表面活性剂组合，使氟碳表面活性剂与碳氢表面活性剂可以形成混合胶束且在合成条件下它们与无机物种有合适的相互作用，则有可能在高温下合成一系列不同结构的稳定的介孔分子筛。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。