氟

To evaluate the bioactivity of the glass-ceramics,the specimens were soaked in the simulated body fluid. The results indicate that fluorapatite shows needle-like microstructure, which is similar to that in human bone and teeth. The formation of needle-like fluorapatite is related to the heat treatment procedure, which results in needle-like fluorapatite crystals by accelerating one-dimension growth along the c-axis through the screw dislocation growth mechanism. The mechanical properties of the glass-ceramics are close to those of the human bone and teeth. The bioactivity test results show that apatite layer is precipitated on the materials surface after 3 d immersion in SBF, which indicates the glass-ceramics have a good bioactivity.

研究结果表明：氟磷灰石相呈针状，与人体骨和牙齿的磷灰石形貌相似，有利于提高材料的生物活性和生物相容性；氟磷灰石的形成是材料被迅速加热至高温进行热处理，使磷灰石以螺旋位错生长机制沿c轴晶化长大所致；经热处理获得的材料具有优良的力学性能，基本满足骨科和齿科用生物材料的性能要求；材料在体外模拟体液中浸泡3 d后，样品表面已有磷灰石层生成，表明该材料具有较高的生物活性。

The key applications,various methods of preparing hexafluoroacetone ,which is an important intermediate for synthesizing organic fluoric materials,were reviewed.

对合成有机氟材料的重要中间体———六氟丙酮的制备研究进展情况及其应用进行了综述。

It was shown that coagulating that fluoric wastewater with PFS brought about a good result,and that the optimized condition s coagulating that sewage .

结果表明：该含氟废水用PFS处理可以收到良好的除氟效果；室温下混凝处理的最适宜条件是：pH=7。

In China, researches on drinking water fluoridation face big challenges. In 1960's, an experiment of tap water fluoridation was conducted in Guangzhou city but did not produce a reliable result due to the Culture Revolution.

饮用水中氟的浓度与龋病的关系、饮水适量加氟的社会效益与可能的危害问题已经在世界范围内进行了半个多世纪的研究。

The author analyzes an insurance database to evaluate the utilization of dental care preventive service and cost-benefit effectiveness of teeth fluoridation and anti-decay treatment program in central part of Taiwan.

全民健康保险自93年7月1日起实施儿童牙齿涂氟预防保健服务迄今已逾四年，本研究旨在探讨使用该项预防保健服务对健保牙医医疗利用之影响，并对涂氟支出之成本与减少之医疗费用进行成本效益分析（cost-benefit analysis，CBA）。

Studies on purifying technology of fluoride wastewater are introduced as well as the mechanism and their applications.

对含氟废水处理技术的研究进行了介绍，讨论了各自的作用机理及其在含氟废水处理中的应用。

In this paper, a new method with fluorination assited ETV-ICP-AES has been proposed for determination of refractory elements and REEs.

因此，本论文提出以聚四氟乙烯为氟化剂，采用氟化辅助ETV-ICP-AES测定难熔元素和稀土元素的方法，并对此进行了深入系统的研究，其主要内容如下

A bstract: Fluorination is one of the most effective chemical methods to modify and control physicochemical properties of diverse carbon materials.

氟化是修饰和控制炭材料物理化学性质的有效方法之一，炭材料的多样性和宽范围的 C-F 键是氟化炭材料具有多种多样性质的基础。

No need extra investment on new equipments and facilities when working with a fluorination treatment supplier.

与氟化处理服务商合作，不需要塑料油箱制造商的额外投资，氟化处理成本低

Perfluorotriethylamine is fabricated through electrochemical fluorination of triethylamine in anhydrous hydrogen ...

本文通过对无水氟化氢和三乙胺的混合溶液在一定条件下的电解氟化，制备全氟三乙胺。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。