查询词典 alkali metal

The analysis of alkali metal and heavy metal contents in the gas is made.

进行了气体中碱金属和重金属含量分析。

The bentonite can be modified by alkali metal and or alkaline earth metal compound.

所述膨润土可以用碱金属和/或碱土金属化合物进行改性。

The findings of present work show that organic/water ratio,alkali metal alkali, phase transfer catalyst, reaction time, reaction temperature, all of them have influence to the molecular weight and yield of the production.

详细研究了溶剂/水的配比、碱金属碱、相转移催化剂、反应温度、反应时间等因素对产品分子量和产率的影响。

The invention relates to a method for the extraction of keratin from dead animal skins, characterised in the treatment of dead animal skins with a substance of general formula, or at least one corresponding alkali metal, earth alkali metal, ammonium, or phosphonium salt, the variables having the following definitions: R, R = together or independently, H, C6-C14 aryl, C1-C12 alkyl, unsubstituted or substituted with one or several SH or OH groups, R, R = together or independently, H, C6-C14 aryl, C1-C12 alkyl, unsubstituted or substituted with one or several SH or OH groups, whereby at least one of R or R is not H, or R and R are not H and two vicinal groups of R to R together may be C3-C10 alkylene, R = H, C1-C12 alkyl, H-C=O or C1-C4-Alkyl-C=O, X, X, X and X = OH, SH or NHR, whereby where Rto R contains at least one sulphur atom, at least one of X to X = SH and where R to R contains no sulphur atom, at least two of X to X= SH.

本发明涉及一种从死亡动物原皮中除去角质的方法，其特征在于用通式I的物质或至少一种对应的碱金属盐、碱土金属盐、铵盐或∴盐处理死亡动物原皮，式I中各变量定义如下：R 1 和R 4 相同或不同且选自氢、C 6 -C 14 芳基和C 1 -C 12 烷基，其未被取代或被一个或多个SH或OH基团取代；R 2 和R 3 相同或不同且选自氢、C 6 -C 14 芳基和C 1 -C 12 烷基，其未被取代或被一个或多个SH或OH基团取代，其中至少一个基团R 2 或R 3 不为氢，或R 1 和R 4 不为氢，且两个相邻基团R 1 -R 4 可以一起为C 3 -C 10 亚烷基；R 5 选自氢、C 1 -C 12 烷基、H-C＝O或C 1 -C 4 烷基-C＝O；X 1 、X 2 、X 3 和X 4 选自OH、SH和NHR 5 ，其中若R 1 -R 4 含有至少一个硫原子，则至少一个基团X 1 -X 4 为SH，以及若R 1 -R 4 不含硫原子，则至少两个基团X 1 -X 4 为SH。

Said mineralizing agent is the fluoric alkali-earth metal salts or alkali metal salts (potassium fluoride or calcium fluoride).

其特征是在磷酸钙盐与碳酸钙盐以2∶1比混合物中，加入0.5～3wt％的含氟离子碱土金属或碱金属盐矿化剂，例如氟化钾、氟化钙等。

The invention provides a method for homopolymerizing conjugated dialkene or co-polymerizing conjugated dialkene and monovinyl aromatic hydrocarbon. The method comprises the following steps: the conjugated dialkene is homopolymerized or the conjugated dialkene and the monvinyl aromatic hydrocarbon are co-polymerized randomly. The method is characterized in that at least one alkali metal alkoxide compound expressed by the formula is used as a structure regulator; in the formula, R is linear chain or branched chain alkylidene radical having 1 to 10 carbon atoms; M is alkali metal selected from Li, Na, K, Rb and Cs.

本发明提供了一种使共轭二烯烃均聚或者使共轭二烯烃与单乙烯基芳烃共聚的方法，包括在阴离子聚合条件下使共轭二烯烃进行均聚或者使共轭二烯烃与单乙烯基芳烃进行无规共聚，其特征在于采用至少一种式所示的碱金属醇盐化合物作为结构调节剂，其中R为具有1-10碳原子的直链或支链亚烷基；以及M为选自Li、Na、K、Rb和Cs的碱金属。

The composition comprises: 35 to 65 wt % of an anionic detergent or surfactant selected from alkyl benzene sulphonic acids, alpha olefine sulfonates, long chain fatty acid sulphates, higher fatty acids, as well as the alkali metal and alkaline earth metal salts thereof, and natural detersive agents, and mixtures of any of these; 3 to 15 wt % of a non-ionic detergent or surfactant selected from alkoxylated alkyl phenols and alkoxylated fatty alcohols; 5 to 10 wt % of a water-swellable cellulose derivative or a salt thereof, wherein the cellulose derivative exhibits a viscosity of at least about 1500 cps, measured in a 1 % aqueous solution at 25 DEG C with a Brookfield viscometer having spindle 3, speed 30rpm, factor 40 for viscosities of 2500-3500 cps; 6 to 20 wt % of a solubility regulator selected from alkali metal and alkaline earth metal chlorides, carbonates and sulphates, aluminosilicates and starch; and 0 to 20 wt % of a fragrance or perfume in solid, liquid or microencapsulated form.

该组合物包含：a35―65％重量的阴离子洗涤剂，其选自烷基苯磺酸、α－链烯烃磺酸盐、长链脂肪酸硫酸盐、高级脂肪酸以及其碱金属和碱土金属盐和天然的去污剂，和任何这些组分的混合物；b）3―15％重量的非离子洗涤剂，选自烷氧基化烷基酚和烷氧基化脂肪醇；c）5～10％重量的水可溶涨的纤维素衍生物或它们的盐，其中纤维素衍生物按1％水溶液在25℃下用Brookfield粘度计（3号转轴，转速30rpm，2500―3500cps粘度的因子是40测定；具有粘度至少约1500cps；d）6―20%重量的溶解性调节剂，选自碱金属和碱土金属氯化物、碳酸盐和硫酸盐、硅铝酸盐和淀粉；和e）0～20％重量的为固体、液体或微囊包封形式的香精。

However the different alkali metal azides RN3 show different reactivity with β-MNCl, and the properties of the products such as superconducting fractions, the lattice constant, and stability against thermal or air, are very dependent on the kinds of alkali metals used.

但是，不同的碱金属叠氮化物具有不同的可反应性，其反应产物也具有不同的性质，例如超导体积百分率、晶格常数、热稳定性和在空气中的稳定性等都和碱金属离子有关。

The complexing properties of compounds 10a, 10b, 11a and 11b toward alkali metal ions were studied by 〓H NMR titration, ESI-MS, UV-Vis spectra, Fluoresence spectra and liquid-liquid extraction. The results show:(1) the 1:1 complexes were formed.(2) The calix-crown 10a, 11a have a higher selectivity for Na〓 ions, whereas 10b, 11b for K〓 ions.(3) The complexing ability toward alkali metal ions was enhanced when the calix-crown have side arm carbonyl.(3) The coordination of alkali metal ions toward phenoxy, carbonyl and crown ethereal oxygens take place by rotation around the carbon-carbon bond of carbonyl and methylene.

六，用〓H NMR滴定，ESI-MS，UV-Vis，Fluorescence，液-液萃取实验研究了10a，10b，11a和11b对金属离子的配位性质，研究结果表明：1）杯芳烃冠醚衍生物同碱金属离子形成了1：1配合物，化合物10a、11a对Na〓具有较高的配位能力，化合物10b、11b对K〓具有较高的配位能力；2）在杯冠醚环的旁边引入带有羰基氧原子的基团作为侧臂参与配位可以加强对碱金属离子的配位能力；3）金属离子分别同苯酚氧，羰基氧，聚氧醚链氧发生了配位，配位过程中侧链基团涉及到了羰基碳与亚甲基碳的碳碳键的旋转过程。

PTFE referred to F4, because of its excellent dielectric properties and corrosion-resistant chemical (high temperature of the molten fluoride elements and the state of alkali metal), non-absorbent, non-stick, not conductive, low coefficient of friction and not Ageing properties, and is widely used in chemical, petroleum, textile pharmaceutical, metallurgy, machinery, electronics, electrical appliances, electricity, food and aviation, military and scientific research in all walks of life, I plant the development of metal bellows, compensation , PTFE bellows F4 tetrafluoroethane compensator, F4 metal composite compensation, anti-corrosion steel liner tetrafluoroethane pipe, steel-lined tetrafluoroethane three links, elbow, Stone, the reaction tower, tower chloride, lining tetrafluoroethane valve Doors, tetrafluoroethane pads and steel-lined polypropylene pipes and accessories, and earnestly solve the user in the production process by the various anti-corrosion problems.

聚四氟乙烯简称F4，由于其优异的介电性能与耐化学腐蚀性(高温下的氟元素和熔融状态下的碱金属外)，不吸水、不粘、不导电、摩擦系数低及不老化等性能，而被广泛应用于化工、石油、轻纺制药、冶金、机械、电子、电器、电力、食品及航空、军用与科研等各行各业中，我厂开发的金属波纹管、补偿器，四氟波纹管F4四氟补偿器、F4金属复合补偿器，钢衬四氟防腐管件，钢衬四氟三通、弯头、四通、反应塔、氯化塔、衬四氟阀门，四氟垫片以及钢衬聚丙稀管道及配件，切实解决了用户在生产过程中所遇到的各种防腐问题。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。