检索结果-南通市图书馆

Oxidizing Capability of Refining Slags Containing BaO

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,metallurgy and Materials 2000年第4期14卷 251-255页

作者： Gang Lu, Guoguang Cheng, Bo Song, Pei Zhao (metallurgy school, university of science and technology beijing, beijing 100083, china) metallurgy school University of Science and Technology Beijing Beijing 100083 China

According to the coexistence theory of slag structure melts, the oxidizing capability of the refining slag CaO-MgO-FeO- A12O3SiO2 is studied and the relationship between the mass action concentration of FeO (NFeO) and the activity of FetO (αFetO) for this slag is found to be as NFeo=0.656 1 αFetO. Furthermore, the calculating model of oxidizing capability of the refining slag BaO-CaO-MgO- FeOA12O3-SiO2 is established. A satisfactory result is obtained when using the above oxidizing capability relationship to calculate the desulphurizing capability of such refining BaO-slags.

关键词： secondary refining slag oxidizing ability calculating model metallurgy

Genetic Algorithm for the Thermal Stresses Optimum Design ofFunctionally Gradient Material Plate

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,metallurgy and Materials 1999年第3期13卷 224-227页

作者： Xiaodan zhang Zhengbin Tang Changchun Ge(Applied science school, university of science and technology beijing, beijing 100083, china) Applied science school University of Science and Technology Beijing Beijing 100083 China

Based on the thermal stress distribution for functionally gradient material (FGM) plates, a Genetic Algorithm (GA) method for the thermal stresses optimum design of FGM plate with computer technologies is given. The m... 详细信息

关键词： functionally gradient material (FGM) thermal stress Genetic Algorithm (GA) crossover mutation

One-Dimensional Fractal Curves and Fractal Dimension Determination

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,metallurgy and Materials 1998年第3期12卷 165-168页

作者： Qikai Li Yue zhang Wuyang Chu(Applied science school, university of science and technology beijing, beijing 100083, china) Applied science school University of Science and Technology Beijing Beijing 100083 China

Various methods for evaluating the fractal curves were reviewed and simulated on computer. It is shown box-counting and power spectrum methods generally give poor measuring results, while yard and variation methods could obtain good results. However,owing to multiple influencing factors, further study needs to be done before widespread application of variation method. In order to improve the measuring accuracy of yard method, a new method has been propoed to measure the fractal dimension by changing the instrumental resolutions.

关键词： fractal fractal dimension computer simulation

Fluid Flow Behavior of Liquid in Cylindrical Vessels Stirred by One or Two Air Jets

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,metallurgy and Materials 2000年第3期14卷 170-177页

作者： Lifeng zhang, Shoji Taniguchi, Kaike Cai, Ying Qu ( Department of metallurgy Graduate school of Engineering, Tohoku university, Sendai 980-579 Japan metallurgy school, university of science and technology beijing, beijing 100083, china) Department of metallurgy Graduate School of Engineering Tohoku University Sendai 980-8579 Japan metallurgy school University of Science and Technology Beijing Beijing 100083 China

Based on the two-phase model (Eulerian-Eulerian model), the three dimensional fluid flow in water and that liquid steel systems stirred by one or two multiple gas jets are simulated. In the Eulerian-Eulerian two-phase model, the gas and the liquid phase are considered to be two different continuous fluids interacting with each other through the finite inter-phase areas. The exchange between the phases is represented by source terms in conversation equations. Turbulence is assumed to be a property of the liquid phase. A new turbulence modification - model is introduced to consider the bubbles movement contribution to and . The dispersion of phases due to turbulence is represented by introducing a diffusion term in mass conservation equation. The mathematical simulation agrees well with the experiment results. The study results indicate that the distance of two nozzles has big effect on fluid flow behavior in the vessel. Using two gas injection nozzles at the half radii of one diameter of the bottom generates a much better mixing than with one nozzle under the condition of the same total gas flow rate.

关键词： fluid flow two-phase Eulerian-Eulerian model model mathematical simulation

XPS Study of CeO_2/Al_2O_3 film

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,metallurgy and Materials 1999年第3期13卷 199-200,204页

作者： Mei zhang Zhenxiang Liu Kan Xie Xueyan Du Wenchao Li(metallurgy school, university of science and technology beijing, beijing 100083, china)(Institute of physics Chinese Academy of science, beijing 100080, china) Univ of science and technology Beijing Beijing China

The redox capacity of CeO2/Al2O3 thin film which was prepared by sol-gel method has been investigated by X-ray Photoelectron Spectrascopy (XPS). The results showed that the thin film was easier to be reduced and re-oxidized than pure CeO2 powder. The key role played by oxygen vacancies which were created from the interaction between CeO2 and Al,O, was also discussed.

关键词： CeO_2/Al_2O_3 thin film redox interaction XPS

Future Trends of Deep Sea Bed Mining technology

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,metallurgy and Materials 1999年第1期13卷 4-7页

作者： Yan Feng Haoran Li Wenming zhang (Resources Engineering school, university of science and technology beijing, beijing 100083, china) Resources Engineering school University of Science and Technology Beijing Beijing 100083 China

The present status of deep sea bed mining technology for polymetallic nodules has been critically examined in light of its history of development the UNCLoS (the United Nation Convention on the Law of the Sea) regime and the current trends in *** critical technologies have been highlighted and the need for system integration underscored. The deep sea bed environment and the engineering challenge were presented and the necessary features of the deep sea bed mining system for commercial mining was analyzed. The key accomplishments, problems and future bends in research in the development of the mining system are also discussed. Finally, it points out that the technology gaps can be filled by the bine commercial mining is undertaken as a result of market conditions in its favor.

关键词： deep sea bed mining, UNCLoS TIS (Total Integrated System), polymetallic nodules mining system

Extra Low NO_x Emission Furnace with HTAC technology

在线全文

学校读者我要写书评

暂无评论

Journal of university of science and technology beijing 2001年第4期8卷 264-266页

作者： Yunze Guan, Daqiang Cang, Xiongfang Nie, Hao Bai, Xianzhao zhang metallurgy school, university of science and technology beijing, beijing 100083, china Univ Sci & Technol beijing Met Sch Beijing 100083 Peoples R China

HTAC (High Temperature Air Combustion) technology needs high temperature air and low oxygen atmosphere to complete its unique combustion and achieve extra low NOx production. In order to apply HTAC technology to forge furnace and meet the NOx emission standard, exhaust gas regeneration technology in combination with no-fuel-switch and U-shape air circulation methods was applied on forge furnace. The results show that extra low NOx emission (NOx = 2.9 x 10(-5), in volume fraction) could be obtained, the NO, emission meets the standards of Japan and US, HTAC mechanism is discussed finally.

关键词： combustion HTAC NOx emission flue gas regeneration no-fuel-switch pollution control

A New High Quality EAF Charge

在线全文

学校读者我要写书评

暂无评论

Journal of university of science and technology beijing 2001年第1期8卷 20-21页

作者： jianliang zhang, Yuquan Liu, Zongwang zhang, Jinlin Jia ,Yongmei zhang metallurgy school, university of science and technology beijing, beijing 100083, china Tianjin Iron Corporation, Handan 056000, china Univ Sci & Technol beijing Met Sch Beijing 100083 Peoples R China Tianjin Iron Corp Handan 056000 Peoples R China

In order to solve the problem of the shortage of scrap, especially high quality scrap, granular pig iron, a new substitute for scrap or DRI (direct reduction iron) has been developed. The technical process of decarbonized granular pig iron has been evaluated. The result shows that this new process is superior to direct reduction process in product quality, construction investment, operation flexibility, production efficiency etc. Decarbonized granular pig iron (DGPI) not only can be used as conventional scrap but also can be charged into EAF as high purity burden equivalent to heavy scrap.

关键词： decarbonized granular pig iron scrap DRI

A Fuzzy Model for Evaluating the Mining Condition of Underground Coal Mines

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,metallurgy and Materials 1999年第4期13卷 242-245页

作者： Zhongrue Li Shaowen zhang(Resources Engineering school, university of science and technology beijing, Beding 100083, china) Resources Engineering school University of Science and Technology Beijing Beijing 100083 China

In mining industries no mines are identical and each mine has its own unique set of mining conditions. In order to study thecondition of mines for efficiency, safety and economy reasons, a fuzzy model is presented based on fuzzy evaluation. Relevant data fromfive mines were collected and the model was used to evaluate the mining condition of these mines. The evaluation results are in conformity with the real situation.

关键词： fuzzy model mining condition coal mine