查询词典 alumina

Objective:To study the effects of alumina particle-size on mechanical properties of alumina-glass composite.

目的：研究氧化铝颗粒大小对氧化铝玻璃复合体力学性能的影响。

In the process of producing Alumina, the technical process of transforming the aluminum hydroxide into Alumina by heating is called baking.

在氧化铝的生产过程中，将氢氧化铝通过加热转变为氧化铝的工艺过程称为焙烧。

The leaching rate of alumina is over 88%, and the alkali leaching filter liquor can be used to prepare aluminum hydroxide and alumina.

氧化铝的溶出率大于88%，碱浸滤液为高苛性比铝酸钠溶液，可用于制取氢氧化铝和氧化铝产品。

Catalysts are made by impregnating a porous transition alumina support with an aqueous solution of a copper ammine carbonate complex, draining off any excess of the impregnating solution, and then heating the impregnated support to a temperature above 80 DEG C to decompose the complex thereby depositing a basic copper carbonate compound on the surfaces of the pores of the transition alumina support.

用作例如催化剂的铜／氧化铝组合物，通过用碳酸铜氨配合物的水溶液浸渍一种多孔氧化铝载体，排出任何多余的浸渍液，然后加热所浸渍的载体到80℃以上的温度来分解所述配合物，从而在所述过渡型氧化铝载体的气孔表面沉积一种碱式碳酸铜来制备。

Global Alumina, which is building a $2.8 billion alumina refinery in the country, said construction work restarted as the strike ended, according to an e-mail today from Chief Financial Officer Michael Cella.

据全球氧化铝公司首席财政管Michael Cella在电子邮件中称，罢工已经结束，其在几内亚耗资28亿美元的氧化铝精炼厂的建设工期也将重新启动。

Alcoa recently announced that its Alcoa World Alumina and Chemicals affiliate and the Government of Jamaica have signed an agreement in principle to expand the Jamalco alumina refinery in Clarendon, Jamaica, by more than 1.5 million metric tons per year.

Alcoa公司最近宣布了其分公司－世界氧化铝及化学产品分厂将在牙买加的Clarendon扩充氧化铝产量的决定，该决定是和牙买加政府的合作下完成的，预计扩产后的氧化铝年产量将比原来的产量多出一倍，达到2800万吨/每年。

An increase of stirring speed and a decrease of amount of alumina in each addition will shorten the complete dissolution time of alumina in the molten cryolite bath, which can meet the requirement of point feeding in the modern aluminium electrolysis cells.

搅拌速度的提高和氧化铝每次加入量的降低可以缩短氧化铝在熔融电解质中的完全溶解时间，这符合现代铝电解槽点式加料的需要。

The results reveal that spectra obtained by different parametric methods are similar. The spectra of normal cells' voltage have only one noticeable lobe due to fluctuation of molten alumina at anodes, while spectra of other abnormal cells have one mainlobe and one sidelobe. In cells with carbon in bath the spectral mainlobe of cell voltage is still due to the fluctuation of molten alumina at anodes and the sidelobe is due to the fluctuation of carbon in bath; in cells with metal pad wave, the spectral mainlobe is due to metal pad waving and the sidelobe is still due to the fluctuation of molten alumina at anodes. Compared with wavelet packet analysis, spectral analysis is simpler and takes less time in calculation, which is a big merit in the large-scale application of online diagnosis systems of working conditions in aluminum reduction cells.

研究结果表明：不同的参数估计法得到趋于一致的频谱分析结果，正常槽只有1个尖锐谱峰，对应于阳极下熔融氧化铝涌动的特征峰，其他故障槽都有2个特征谱峰，即1个主峰和1个次峰，碳渣槽的主峰仍然对应着阳极下熔融氧化铝涌动特征峰，次峰对应悬浮碳渣的涌动特征峰；铝液波动槽主峰对应铝液波动特征峰，次峰对应着熔融氧化铝涌动的特征峰；频谱分析相对于小波包分析具有算法简单、耗时少、物理意义明确等特点，在槽况在线诊断系统的大规模推广中具有优势。

In this paper, based on a pill-box window model with a conical-shaped alumina ceramic and Ansoft HFSS software, the relation of VSWR with various electrical parameters in the window is simulated; the effects of variations of the output window structure on electrical field intensity, microwave power flow and quantity of heat are analyzed; the electrical characteristics of frequency bandwidth, power capability and heat dissipation for the pill-box window with conical-shaped or disk alumina ceramic are discussed, which shows that, with a rational structure of the window with conical-shaped alumina ceramic, the output capability of microwave peak and average power may greatly be increased, the secondary electron emission may effectively be suppressed, and heat dissipation may become more uniform and be easier for cooling.

本文在前人工作的基础上，基于圆锥形陶瓷盒形输出窗模型，采用Ansoft HFSS三维计算软件的优化模拟，对该输出窗模型的驻波频率特性与各种结构参量的关系进行了优化模拟，分析了该输出窗片结构变化对其表面的电场分布，功率流分布、热量分布的影响，得出最优模型参数。并且探讨了陶瓷窗片的形状和几何结构对改善输出窗的频带特性、提高峰值功率和平均功率、抑制二次电子倍增方面的作用。

Porous alumina templates with different apertures were fabricated by changing the oxidation voltage in two-step anodic oxidation, and then Cu nanowires were synthesized in porous alumina by the alternating current electrochemical deposition method. The Cu/PAA was analyzed by SEM and XRD, the results have shown that Cu nanowires were indeed synthesized in porous alumina which had the same diameter and good structure of wire grating.

通过改变二次氧化过程中的氧化电压，制备了不同孔径的多孔Al模板；采用交流电沉积的方法，制备了含Cu阳极PAA膜。X射线衍射分析表明，阳极PAA膜上确有Cu生成；扫描电镜显示，Cu纳米线粗细均匀，具有很好的线栅结构。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。