查询词典 cobalt

The invention relates to a process for producing polyethylene terephthalate 1, 3-propanediol, which comprises the following steps: using titanic acid ester as major catalyst, using germanium compounds and cobalt compounds as synergic catalyst, conducting esterification reaction for poly terephthalic acid and 1, 3-propanediol according to the molar 1:1.05-2.2 under the nitrogen pressure of 0.1-0.4MPa and 230-265 DEG C, or conducting ester exchanging reaction for poly terephthalic acid and 1, 3-propanediol according to the molar ratio 1:1.8-2.2 in 160-220 DEG C, decompressing reaction to high vacuum 10-150Pa, wherein the final temperature of reaction is 265-275 DEG C, recovering to normal pressure with nitrogen to obtain the PTT product.

本发明涉及一种生产聚对苯二甲酸1，3-丙二醇酯的方法，采用以钛酸酯为主催化剂，锗化合物和钴化合物为协同催化剂，对苯二甲酸二甲酯和1，3-丙二醇按摩尔1∶1.05-2.2，在0.1-0.4MPa氮气压力和230-265℃下进行酯化反应，或对苯二甲酸二甲酯和1，3-丙二醇按摩尔比1∶1.8-2.2，在160-220℃进行酯交换反应，将反应减压至高真空10-150Pa，反应终温在265-275℃，用氮气恢复到常压，得到本PTT产品；大大缩短了反应时间，直接聚合制备特性粘度在0.7-1.05dL/g的PTT切片，使反应产物色相良好，PTT产品可用于纤维加工及工程塑料领域。

During a long period, cobalt is thought to be a good binder due to good wetting properties, but its present price is as high as 720 yuan per kilogram, so the study of substituting Co diammd tool is an important subject in our country.

长期以来，金属钴被认为是金刚石工具中最好的粘结金属，但由于金属钴其价格和供应极不稳定，目前市场价格高达720元/kg，所以研究代钴金刚石工具是国内研究者正进行的一个重要课题。

By this simple method, trinary oxides such as several kinds of ferrites were prepared. XRD and SEM were employed to characterize the phase and morphology of the final product. Hysteresis loops of the as-prepared ferrites were given and cobalt ferrite had the biggest magnetism and coercive force.

运用溶液燃烧法一步合成了多种铁氧体等三元氧化物，分别用X-射线粉末衍射、扫描电镜对其相态和形貌进行初步的表征；磁性能研究显示钴铁氧体具有最大的磁能积和矫顽力。

The Mo-coating is only effective in improving TRS in cobalt-based matrix, the reason of which was also discussed inthe paper.

抗弯强度的变化主要是由于Mo对结合剂的局部强化、硬化并由此引起的复合材料内部的热应力的改变以及Mo层改变了结合剂对金刚石的浸润等因素引起的。

Good quality. The Company products are sold throughout the country have a good reputation of the company's M35 M42 cobalt twist drill now bulk exports of Hong Kong.

品质优良。本公司产品销往全国各地均有良好的口碑本公司的含钴麻花钻 M35 M42 现已批量出口香港。

The blue-and-white porcelain is belongs the Underglaze Decoration ,which the colorant is based on a kind of cobalt mineral raw material, and then high temperature sintering.

青花瓷属于陶瓷釉下彩装饰，它是以含钴的矿物原料为着色剂，在高温下烧成。据考古资料表明，早在唐宋时代中国就有青花瓷的烧造，但直至元代才在景德镇出现成熟的青花瓷器。

Vitallium is one kind of dental alloy with cobalt, chromium and molybdenum etc. It has three ranks respectively: Vitallium, Vitallium 2000 and Vitallium 2000 plus.

Vitallium是一种用于铸造可摘支架的高钴铬钼合金，它有itallium、Vitallium 2000和Vitallium 2000 plus共3个级别。

Not only will this enable you to breed both whitewing and yellow-wing, but also to reproduce birds in all colour shades, ie Light, Dark and Olive Green and Skyblue, Cobalt Mauve and Violet in the Blue Series.

这不仅会令你既whitewing繁殖和黄翼，而且在所有复制色调鸟，即轻，黑暗和橄榄绿色和天蓝色，紫红色和钴的蓝紫色系列。

The nano-Co particles were prepared by chemical method from zinc dust and cobalt chloride.

以锌粉和氯化钻为原料，采用化学法制备纳米Co粒子。

It is an important consideration in purification circuits that removal cadmium completely prior to cobalt cementation, because cadmium can inhibit basic zinc sulphate to adsorb on the surface of zinc dust.

镉可以起到阻止碱式硫酸锌或氢氧化锌吸附在锌粉表面的作用。欲加速钴的置换和提高置换效率，必须形成锌-钴合金或锌-镉合金。

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％。