查询词典 fluoride

Extraperiosteal ossification of bone injury induced by fluoride is closely associated with fibroblasts which belong to inducible osteogenic precursor cell in bone, they have osteogenic function under special conditions.

氟性骨损伤骨周化骨与成纤维细胞密切相关，在骨周组织中，成纤维细胞(fibroblast， FB)属于诱导性骨祖细胞范畴(inducible osteogenic precursor cell， IOPC)，在特殊条件下具有成骨功能。

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。

It divided into two steps to prepare cryolite from fluosilicic acid, in the second step, cryolite is manufactured through the reaction of the ammonium fluoride solution with the sodium sulfate and the aluminum sulfate.

氟硅酸制取冰晶石分两步进行，第二步用得到的氟化铵溶液与硫酸钠和硫酸铝反应制冰晶石。

Fluosilicic acid is the by-product in production of phosphate fertilizers.With certain temperature,adjusted pH,and controlled reaction time,fluosilicic acid was dissolved in the solution of ammonia liquor,and then runny paste of silica and solution of ammonium fluoride were obtained after seperating the reaction slurry.

采用氨水在一定温度下与磷肥行业副产品氟硅酸反应，调整pH，控制反应时间，反应后得到的料浆，经过滤得白炭黑软膏和氟化铵溶液。

Dihydrojasmone was synthesized from2-hexyl-5-methyl-1,2-oxaborolane,prepared frommethyl vinyl ketone and hexene,via the homologationwith 〓 followed by PCC oxidation and intra-molecular condensation.In stead of the oxidation ofthe C-B bond of 1,2-oxaborolane,fluoride inducedhalogenation of 2-alkoxy-1,2-oxaborolane was found togive 3-halopropanol.

硼氢化甲基乙烯基酮和已烯得到的2-已基-5-甲基-1，2-氧硼杂环戊烷与〓反应，再经PCC氧化，分子内缩合得到二氢茉莉酮。1，2-氧硼杂环戊烷的C-B键除氧化断裂之外，也能够在〓或KF作用下卤化断裂成碳卤键。

Tetrachloroterephthalic acid was prepared by chlorinating terephthalic acid, oleumsolvent and iodine catalyst. Tetrachloroterephthalic acid was acylated by sulphurous oxychloride in the presence of DMF to form tetrachloroterephthaloyl chloride. The acyl chloride product was fluorinated by potassium fluoride and esterified by methanol to synthesize dimethyl tetrafluoroterephthalate. The ester was reduced with potassium borohydride and lithium chloride to give tetrafluoroterephthalyl alcohol. The above product was bromated in the hydrobromic acid to obtain 4-bromomethyl-2,3,5,6-tetrafluoro-benzene methanol. 4-Methyl-2,3,5,-6-tetrafluorobenzene ethanol was obtained by reducing the bromide with magnesium. In the exist of DCC and DMAP, tefluthrin was got by the condensation reaction between 4-methyl-2,3,5,6-tetrafluoro-benzene methanol and-(1RS,3RS)- 3-(2- chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethyl cycolpropanecar-boxylate acid.

对苯二甲酸与氯气在碘存在下以发烟硫酸为溶剂进行氯化制备四氯对苯二甲酸；再以DMF为催化剂与二氯亚砜反应生成四氯对苯二甲酰氯；以氟化钾为氟化剂，环丁砜为溶剂置换氟化，再与甲醇酯化得到四氟对苯二甲酸甲酯；以KBH4-LiCl为还原剂二甲醚为溶剂反应制得四氟对苯二甲基苄醇；以氯苯为溶剂在溴化氢溶液中溴化得到溴化产物；在乙醇溶液中经镁粉还原得到4-甲基-2，3，5，6-四氟苄醇；甲基苄醇与功夫酸在催化剂二环己基碳二亚胺和4-二甲氨基吡啶作用下缩合得到七氟菊酯，总收率达43.6%。

Five experimental water bodies in contrast with Ganggeng Lake were chosen according to water fluoride concentration,and their hydrochemistry characteristic and the fluorine distribution of main economic fish were analyzed.

2003~2006年，先后调查了内蒙古自治区153个渔业水体的氟含量，并根据其浓度梯度选择了5个试验水体和1个对照水体，分析了其水化学特征及其主要经济鱼类各组织器官的氟含量分布情况。

Therefore can pass to use the cupric sulfate sulfuric acid potassium for the catalyst take sulfuric acid as to carry the body to digest it, make the amino acids chelate match the conversion for dissolve sex easily of ammonium sulfate and white vitriol, then absorb a fixed amount to try the kind to join 40% sodium hydroside combine under the steam heat function make ammonia the spirit swims to leave out, through cool off to respond the born boric acid with boric acid, be got the total nitrogen content by the standard aqua titration of hydrochloric acid immediately after;But the white vitriol can immediately join the hydrochloric acid hydroxylate , fluoride to turn the in order to cover up, carry on the titration but get the content of its zinc with the EDTA mark liquid..

因此可以通过用硫酸铜硫酸钾为催化剂以硫酸为载体将其消化，使氨基酸螯合锌转化为易溶性的硫酸铵和硫酸锌，然后吸取一定量的试样加入40 %的氢氧化钠并在水蒸气高温作用下使氨气游离出来，经冷却与硼酸反应生成硼酸铵，接着由盐酸标准溶液滴定得到总氮含量；而硫酸锌即可加入盐酸羟铵、氟化氢铵为掩蔽剂，用EDTA标液进行滴定而得到其锌的含量。

Moreover, based on the petrochemical industrial characteristics, this specification has defined benzene piping with a hypertoxicity level of extremely harmful medium as Grade SHB piping and acrylon, carbonyl chloride, carbon disulfide sulphide and hydrogen fluoride piping with a hypertoxicity level of high harmful medium as Grade SHA piping.

此外，根据石化行业的特点，本规范将毒性程度为极度危害介质的苯管道作为 SHB 级管道处理，将毒性程度为高度危害介质的丙烯腈， 48 SH 3501-2002 光气，二硫化碳和氟化氢管道作为 SHA 级管道处理。

Methods: Glass electrode,iodometric method,disodium EDTA titration,silver nitrate titration,fluoride ion selective electrode.

玻璃电极法、碘量法、乙二胺四乙酸二钠滴定法、硝酸银滴定法、氟离子选择电极法等。

This paper designs the communication system of radio telescope FAST.

针对500m口径球面射电望远镜FAST分布式控制系统的特点完成了其通信系统的设计。

Political sheep's step-by-step a large number of fossils unearthed in the county soil Ma Ali after rural village in the middle of sallow pelitic siltstone.

步氏和政羊化石大量出土于广河县阿力麻土乡后山村，产于灰黄色泥质粉砂岩中。