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ZnO varistors are prepared using the 0.1–0.3 mm ZnO powders. The effects of the sintering temperature, contents of In 2 O 3 doping on the non-linear properties of ZnO varistors have been investigated. The results show that this kind of ZnO powder has a high sintering activity. It is suitable...
Based on the principle of statistics and the research results by Zhu Jianjun, the paper establishes the mean Cook distance of scale parameter and studies its properties. The paper still presents the robust estimate of scale parameter with minimum mean Cook distance and theoretically shows that...
The effects of Mn 2+ on the flotation behaviour of fine refractory antimony oxide and its flotation separation from silicified limestone were studied. The principal gangue mineral, under the condition of pH=7.5 and in the presence of modified water glass through flotability test, measurements of...
A study was carried out on kinetics of oxygen evolution on lead alloy anodes in sulphuric acidic electrolyte. The influence of alloy elements Ca, Ag and Sn on the overpotential of oxygen evolution was investigated. All anodes had been subjected to a pre-polarisation before the measurement of...
A new technology for the crystallization of ammonium paratungstate with coarse grain has been studied. The factors influencing the physi-chemical properties of ammonium paratungstate crystal, such as temperature, concentration, seed crystal, agitation, etc. were examined. It is necessary to keep...
The mechanism of forming defects in 2024, 7075 series aluminium alloy forgings has been studied by means of metallography, EDAX, SEM etc. The defects are divided into two types by their appearance: needle-shaped and flake-shaped. The mechanism of them forming is discussed. It has been testified...
Various kinds of base oils were applied to cold rolling aluminum strips on a test mill for evaluation of the influences of these base oils, aromatics contents and viscosity of base oils on their lubricating performances and surface reflectivity of rolled strips at annealing. Results showed that...
The flowing behavior of liquid slag has an important effect on the heat efficiency, recovery ratio of valuable metals and life span of the electric cleaning furnace. The velocity procedure using “ k-ε ” model was developed under the cylindrical coordinate system. The procedure is used to...
Nine kinds of glass-ceramic matrix composites with different compositions and interfacial strength ( τ s ) were prepared. The influence of τ s on the fracture toughness( K 1c ) of composites was studied. It was discoved that, for the system no chemical reaction taking place at the interface, K...
A new forging technique—short-hollow-rapid die forging, used in Ti-Al alloys was studied. Compared with conventional method, the new method can improve the crystalline structure properties of the forged piece, reduce the average forging pressure by 20% to 30%, lessen the thickness deviation by...
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