氟化

Methods Enamel surface specimens were randomly allocated into 3 groups: 1 450 mg/L sodium fluoride dentifrice group, 1 450 mg/L sodium monofluorophosphate dentifrice group and non-fluoride dentifrice control group. Sound enamel surfaces were dematerialized in bacteria model in vitro. QLF was used to analyze the area of lesions, the loss of fluorescence and ΔQ on enamel surfaces after demineralization.

将30个牙釉质块开窗后分为3组，分别使用氟含量1 450 mg/L的氟化钠牙膏、单氟磷酸钠牙膏和无氟牙膏的处理液处理，并在体外恒化器龋病模型中进行脱矿循环，定量光导荧光技术分析病损脱矿后的面积、荧光损失和总荧光损失量，激光扫描共聚焦显微镜分析脱矿后矿物质含量变化。

Enamel surface ecime were randomly allocated into 3 grou : 1 450 mg/L sodium fluoride dentifrice group, 1 450 mg/L sodium monofluoropho hate dentifrice group and non-fluoride dentifrice control group. Sound enamel surfaces were dematerialized in bacteria model in vitro. QLF was used to analyze the area of lesio, the lo of fluorescence and ΔQ on enamel surfaces after demineralization.

将30个牙釉质块开窗后分为3组，分别使用氟含量1 450 mg/L的氟化钠牙膏、单氟磷酸钠牙膏和无氟牙膏的处理液处理，并在体外恒化器龋病模型中进行脱矿循环，定量光导荧光技术分析病损脱矿后的面积、荧光损失和总荧光损失量，激光扫描共聚焦显微镜分析脱矿后矿物质含量变化。

Reaction mechanism for 11,1,2-tetrafluoroethane preparation is carried out through gas phase fluorination by hydrogen fluoride over chromium-magnesium fluorination catalysts with trichloroethylene as main materials and dynamics models are set up.

研究了以三氯乙烯为主要原料，在铬镁氟化催化剂存在下，用氟化氢气相氟化制备1，1，1，2-四氟乙烷的反应机理，建立了动力学模型。

The concentrations of CO2, CF4, thionyl sulfide (SOF2), sulfuryl fluoride (SO2F2), disulfuryl decafluoride (S2OF10), sulfur dioxide (SO2) and sulfureted hydrogen (H2S) were in partial normal distribution. The concentrations of CO2, CF4, SOF2, SO2F2, S2OF10 were all below 0.1%; the concentrations of SO2 were below 3μL/L; the concentrations of H2S were below 1μL/L. The SF6 byproducts concentrations in 500kV GIS were lower than those in 220kV GIS. The SF6 byproducts concentrations were lower in GIS that have been operating longer. The SF6 byproducts concentrations were significantly different in equipment from different manufacturers.

结果显 示：SF6 GIS 中CO2、CF4、氟化亚硫酰（SOF2）、氟化硫酰（SO2F2）、十氟化二硫酰（S2OF10）、二氧化硫（SO2）和硫化氢（H2S）都成偏正态分布，其中，CO2、CF4、SOF2、 SO2F2、S2OF10 的含量均小于0.1％，SO2 的含量均低于3μL/L，H2S 的含量均低于1μL/L.500kV GIS 设备中SF6 分解产物含量低于220kV GIS 设备；运行时间越长，设备中SF6 分解产物的含量越高；不同设备厂商的GIS 中 SF6 分解产物含量有显著性区别。

The construction in the future: 6 produce 10000 tons of HFC-152a, the substitute of ODS and 4000 tons of HCFC-142b a year; 7 produce 7000 tons of HCFC-123 and 3000 tons of-113a; 8 build PEVE rosin production with annual output of 5000 tons; 9 produce 3000 tons of PVDF a year; 10 produce 2000 tons of fluorobenzene and 1000 tons of dichlor fluorbenzene a year; and 11 fluoride salt combine device with annual output of 3000 tons.

远期建设：6、ODS替代品HFC-152a年产1万吨联产HCFC-142b4000吨；7、年产HCFC-123产品7000吨、联产二氯三氟乙烷-113a产品3000吨；8、年产PEVE树脂5000吨生产线；9、年产3000吨PVDF氟碳涂料树脂；10、年产2000吨氟苯，二氯氟苯1000吨；11、年产3000吨氟化盐联产装置。

The density of potassium fluotantalate and its mixed melt salt system with sodium chloride, potassium chloride, sodium fluoride and potassium fluoride are measured by Archimedes principle .

用阿基米德法测定了氟钽酸钾及其与氯化钠、氯化钾、氟化钠、氟化钾等混合熔盐体系在熔融状态下的密度，用线性回归分析方法导出了各熔盐体系的密度与温度的关系。

The results indicate that aluminum fluoride product will be returned about 140 t,sodium silicofluoride and cryolite are 238 t and 206 t,and neutralization residue is 375 t,if the mother liquor output of aluminum fluoride product is 4000 t per year.The annual economic benefit will reach 1,400,000 yuan RMB.

半工业化实验结果表明：计算年产4 000 t氟化铝产品的母液，企业可回收产品氟化铝140 t，生产副产品氟硅酸钠238 t、冰晶石206 t、中和残渣375 t，每年可获效益140万元人民币。

Sound enamel surfaces were dematerialized in bacteria model in vitro. QLF was used to analyze the area of lesions, the loss of fluorescence and ΔQ on enamel surfaces after demineralization. Confocal laser scanning microscopy was used to quantify the mineral content after demineralization.

将30个牙釉质块开窗后分为3组，分别使用氟含量1 450 mg/L的氟化钠牙膏、单氟磷酸钠牙膏和无氟牙膏的处理液处理，并在体外恒化器龋病模型中进行脱矿循环，定量光导荧光技术分析病损脱矿后的面积、荧光损失和总荧光损失量，激光扫描共聚焦显微镜分析脱矿后矿物质含量变化。

Fluorination modification and electret properties were studied on the cellular polypropylene films modified by gaseous fluorine, by attenuated total reflection infrared analysis and the measurings of open-circuit thermally stimulated discharge current and in situ TSD charge and isothermal charge decay.

通过衰减全反射(Attenuated Total Reflection， ATR)红外光谱分析与开路热刺激放电（Thermally Stimulated Discharge， TSD）电流、原位实时电荷TSD和电荷等温衰减的测量，本文研究了氟气对孔洞聚丙烯膜的氟化改性及氟化改性对其驻极性能的影响。

This article describes the low pressure fluorination process for production of dichlorodifluoromethane , discusses the problems of prevailing in the process and proposes an improved process-high pressure fluorination reactor with external circulation.

介绍了二氟二氯甲烷低压氟化反应的生产过程，指出和剖析了生产技术中存在的问题，提出了采用外循环加压氟化反应器的改进措施。改进后的反应器具有生产能力大，反应气质量好，催化剂损耗低等特

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐