查询词典 high-melting metal

The foundry has many kinds of casting machines about 460, such as furnaces, moulding and core making, heat treatment, mend welding, permeating, etc .It also has kinds of casting technics, for example ,sand mould ,metal moud, low pressure, die castings, vacuum suction,high pressure, etc.

拥有各种铸造（熔炉、造型［芯］、浇注、热处理、补焊、浸渗等）设备及装置460余台，具有普通砂型、金属型、低压、压铸、真空吸铸和高压釜等浇注工艺。

British Nair lubricants lubricants for many years dedicated to the processing of product development, after many years of dedicated efforts, the field in the industry has accumulated rich experience and formed an international advanced technology, and lots of technical engineers, with its own characteristics industrial lubricants brand, and metal processing industries continue to deliver high-performance products and unique professional services, after years of development, to gain market recognition.

英耐尔润滑油多年来致力于加工润滑剂的产品开发，经过多年来兢兢业业不懈的努力，在行业领域积累了丰富的经验，并形成了具有国际先进技术、拥有大量技术工程师、具有自己特色的工业润滑油品牌，并不断为金属加工行业提供高性能的产品和独特的专业服务，经过多年的发展，获得市场的认可。

Carbonic anhydrase of Vitex negundo in the karst area showed good stability to heatand good adaptability to intimidation of metal with high concentration such as Mg2+、Ca2+、Zn2+、Mn2+、Cu2+ and Co2+.

岩溶地区典型植物黄荆叶片提取的碳酸酐酶具有良好的热稳定性，并对岩溶环境中高浓度的Mg2+、Ca2+、Zn2+、Mn2+、Cu2+、Co2+等金属离子胁迫具有良好的适应性。2。

In the presence of catalytic rhodium acetate, ethyl 2-diazo-3-oxo-per fluoroalkanoates, reacted readily with nitriles to give a series of 5-fluoroalkyl substituted 1, 3oxazoles with high regio-selectivity through a metal carbenoid intermediate. The reactions of carbenoids with noncyclic vinyl ethers or cyclic vinyl ethers afforded dihydrofuroates in good to excellent yields. Interestingly, only vinyl C-H insertion compound was obtained concerning of the reaction of carbenoids with 2, 5dimethylfuran due to the steric hindrance of methyl group

醋酸铑分解2-重氮-3-氧代-全氟羧酸乙酯形成的金属卡宾作为1，3-偶极体，可以与一系列芳基或烷基取代的腈反应，高度区域选择性地生成一系列4-乙氧羰基-5-氟烷基取代的噁唑化合物；也可以与富电子的链状和环状的烯基醚反应，以优良的产率得到一系列氟烷基取代的二氢呋喃类化合物；而与2，5-二甲基呋喃的反应，由于甲基的位阻作用，只得到金属卡宾对呋喃3-位烯基碳氢键插入产物。

In this article, star-high vinyl content polybutadiene was prepared using a multi-functional organolithium anionic initiator by " one-step " process. On the basis of 250ml glassware experiment ,we improved the experiment in 2L metal kettle. The polymerization condition was got as follows: polymerization temperature : 50-60 ℃, monomer content : 8-llg/100ml, polymerization time : 3~4 hours.Chracterizations were carried out by 'H-NMR, IR and GPC.

本文首次采用多官能团有机锂引发剂一步法合成出了星型高乙烯基聚丁二烯，在250ml玻璃瓶的基础上，进行2L金属斧的扩大实验，确定了以下聚合工艺参数：聚合反应温度：50～60℃，单体浓度：8～11g／100ml，聚合反应时间：3～4小时。

In addition, the invention further relates to a catalyzer combination used for polymerizing a conjugated dialkene monomer and the anions of an optional mono-vinyl aromatic hydrocarbon into a polydiene polymer having high and medium vinyl content. The catalyzer combination comprises an organolithium compound used as an anionic polymerization initiator, at least an alkali metal alkoxide compound expressed by the formula as a structure regulator.

此外，本发明还涉及一种用于将共轭二烯烃单体和任选的单乙烯基芳烃阴离子聚合成具有中高乙烯基含量的聚二烯聚合物的催化剂组合物，其包含作为阴离子聚合引发剂的有机锂化合物，和作为结构调节剂的至少一种式所示的碱金属醇盐化合物。

Metal/ oxide composite aerogels can be used as catalysts because of their high specific surface area. In this paper, Co-rich Co/SiO2 composite aerogels in which mass fraction of Co can reach 66%were firstly prepared by sol - gel process of Co-containing tetraethyl orthosilicate. The influence of H2O, catalyst, solvent and composition of Co-containing tetraethyl orthosilicate on the sol-gel process are discussed.

本工作首次采用含钴硅酸乙酯进行溶胶～凝胶反应来制备高钴含量的纳米级Co/SiO2复合气凝胶，制备的Co/SiO2复合气凝胶中n：n的比例最高可达2：1，且复合气凝胶中的Co含量可在小于66％的范围内任意调节，并系统研究了水量、催化剂浓度、溶剂量及含钴硅酸乙酯的组成对溶胶-凝胶过程的影响。

Based on the failure analysis of hot roll, this paper optimizedly adjusts alloy system and summarizes the experience of rolling wiresand improves ail processing properties. Then, it analyses the effects on some natural parameters such as alloy transfer coefficient, surfacing layers, welding current and arc voltage etc.. It confirms the fitting ageing technique. Also, it discusses the microscopic structural transformation back and forth ageing and the effects on hardness change of overlaying metal by some alloying elements including C, Cr, V, W, Mo, Ni, Mn, B, Re through OM, SEM and X-ray diffraction analyses. Finally the abrasive resistance, red hardness, thermal fatigue property and anti-high temperature oxidability are investigated in experimentation.

全文在热轧辊失效分析的基础上优化调整合金体系，总结了焊丝轧制的经验，改善各种工艺性能，分析了几个特性参数的影响，确定了适宜的时效工艺，并通过光学显微镜、扫描电镜和X-射线衍射对时效前后的显微组织转变以及部分合金元素如C、Cr、V、W、Mo、Ni、Mn、B、Re对堆焊层硬度变化的影响进行分析，最后通过试验考察了堆焊层金属的耐磨粒磨损性能、红硬性、耐热疲劳性和抗高温氧化性。

Cu2-Co2-KBr with high catalytic activity and selectivity shows synergistic effect between metal ions.Under the reaction conditions of mCu(Ac2:mCo(Ac2:m= 0.1:0.5:0.1, n:n=0.14, glacial acetic acid as solvent, overdosage sodium percarbonate, 65℃, the conversion can reach 45.9% and the selectivity for p-methoxy benzaldhyde is about 68.3%.

结果表明，Cu2-Co2-KBr具有较高的催化活性和选择性，体现出金属离子之间的协同作用，对甲基苯甲醚在mCu(Ac2：mCo(Ac2：m=0.1：0.5：0.1，n：n=0.14，冰醋酸作溶剂，稍过量的过碳酸钠，65℃的条件下，转化率可达45.9%，生成对甲氧基苯甲醛的选择性为68.3%。

The most commonly used complexes for this application are transition metal complexes especially ruthenium polypyridyl or phenanthroline complexes and metalloporphyrins owing to their high quantum yields, large Stokes shifts and long luminescent lifetimes.

这类传感器是基于氧气对所使用的发光分子激发态的猝灭行为而形成的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。