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确定单种煤最佳活惰比的简易法 被引量:8
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作者 张代林 姚伯元 刘衍棋 《燃料与化工》 2001年第5期231-232,共2页
通过测定单种煤添加不等量无烟煤所炼制坩埚焦的显微强度,确定出它们的最佳活惰比。
关键词 单种煤 活惰性 显微强度 炼焦 无烟煤 坩埚焦
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Self-reaction of initial active groups in coal 被引量:7
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作者 Qi Xuyao Wang Deming +1 位作者 James A Milke Zhong Xiaoxing 《International Journal of Mining Science and Technology》 2012年第2期169-175,共7页
For further understanding of self-heating of coal, we tested the reactions of seven different ranks of coal under inert atmosphere. In the test, 50-gram of coal sample ranged from 0.18 mm to 0.38 mm was put into a spe... For further understanding of self-heating of coal, we tested the reactions of seven different ranks of coal under inert atmosphere. In the test, 50-gram of coal sample ranged from 0.18 mm to 0.38 mm was put into a special designed copper reaction vessel and let pure nitrogen to flow into the coal sample from the bottom at a rate of 100 mL/min. The programmed temperature enclosure was run at a programmed rate of 0.8 ~C/min. The concentration of the carbon oxides and the coal temperature were tested. The results show that the coal reactions under inert atmosphere can generate CO and C02. The reactions under inert atmosphere are affected by coal ranks, initial pore structure of coal and sulfur content. For low ranks of coal, the productions of carbon oxides are piecewise. The coal temperature is lower than the surrounding temperature throughout the reactions under inert atmosphere, but it rises quickly and reaches a crossing point temperature in the later stage under dry-air atmosphere. Based on the analysis, it indicates the self-reaction of initial active groups exists in the self-heating of coal besides the reactions in the two parallel reactions model. Spontaneous combustion of coal is due to both the oxidation heat accumulation and the chain reaction. A new reaction model of self-heating of coal was orooosed. 展开更多
关键词 CoalSelf-heatingInitial active groupsSelf-reactionInert atmosphereCarbon oxides
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Activated flux tungsten inert gas welding of 8 mm-thick AISI 304 austenitic stainless steel 被引量:6
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作者 刘观辉 刘美华 +3 位作者 易耀勇 张宇鹏 罗子艺 许磊 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第3期800-805,共6页
AISI 304 stainless steel plates were welded with activated flux tungsten inert gas(A-TIG) method by utilizing self-developed activated flux. It is indicated from the experimental results that for 8 mm-thick AISI 304 s... AISI 304 stainless steel plates were welded with activated flux tungsten inert gas(A-TIG) method by utilizing self-developed activated flux. It is indicated from the experimental results that for 8 mm-thick AISI 304 stainless steel plate, weld joint of full penetration and one-side welding with good weld appearance can be obtained in a single pass without groove preparation by utilizing A-TIG welding. Moreover, activated flux powders do not cause significant effect on the microstructure of TIG weld and the mechanical properties of A-TIG weld joints are also superior to those of C-TIG(conventional TIG) welding. 展开更多
关键词 A-TIG welding activated flux 304 stainless steel full penetration mechanical properties
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From Inert Knowledge to Activated Knowledge: Practical Ideas for Improving Student Learning
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作者 Enoch Hale 《Journal of Philosophy Study》 2013年第4期312-323,共12页
In this article, I argue for the integration of learner-centered, high impact practices for the typical day of instruction. In doing so, I build off of a general, but robust, theoretical framework designed to promote ... In this article, I argue for the integration of learner-centered, high impact practices for the typical day of instruction. In doing so, I build off of a general, but robust, theoretical framework designed to promote substantive self-reflection which orients the tactical suggestions for improving student learning. The recommendations are practical and easily adopted as resources for challenging students to develop general critical thinking skills and dispositions especially those addressing metacognition and questioning one's assumptions of knowledge and understanding. 展开更多
关键词 best teaching practices high impact strategies critical thinking KNOWLEDGE inert knowledge
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Nitrogen-rich porphyrinic metal-organic frameworks synthesized by postsynthetic metathesis: from inert material to active catalyst
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作者 Dahuan Liu Xuan Wang +3 位作者 Ying-Pin Chen Shuai Yuan Chongli Zhong Hong-Cai Zhou 《Science China Chemistry》 SCIE EI CAS CSCD 2016年第8期975-979,共5页
With the aid of a postsynthetic metathesis method, an inert nitrogen-rich porphyrinic metal-organic framework can exhibit a high catalytic activity in one-pot deacetalization-Knoevenagel condensation reaction.
关键词 metal-organic frameworks porous coordination network post-synthetic metathesis CATALYSIS TETRAZOLATE
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A novel purification technique for noble gas isotope analyses of authigenic minerals 被引量:2
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作者 HE LiYan QIU HuaNing +3 位作者 SHI HeSheng ZHU JunZhang BAI XiuJuan YUN JianBing 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第1期111-117,共7页
Noble and active gases are released from geological samples during gas extraction for noble gas isotope analyses. The active gases should be removed before inletting to mass spectrometers for the analyses. The normal ... Noble and active gases are released from geological samples during gas extraction for noble gas isotope analyses. The active gases should be removed before inletting to mass spectrometers for the analyses. The normal noble gas preparation systems can clean up most geological samples. However, authigenic minerals from sedimentary rocks in oil/gas fields contain organic matter, which cannot be cleaned up by the normal preparation systems and thus influence the noble gas analyses. We introduce a novel gas purification system (PRC patent No. ZL201320117751.2), which includes several reversible purification pumps with different absorbing and degassing temperatures. It can well clean up water steam, carbon dioxide and organic gas- es. Mica minerals are often used for 40Ar/39Ar dating. A muscovite sample (2082MS) which could not be cleaned up by the normal preparation system with two SAES NP10 getters, becomes the test sample for a comparative experiment in this study. The experiment is assigned into 4 sections with the organic gas removal system (OGRS) "Closed/Opened" in turn. When the OGRS is closed only with two NP10 getters for purification, the 40At intensities increase in curves with inlet time because of impurities, the 40Ar/39Ar dating results yield age errors about +2%-±1% (20-). When the OGRS is opened for purification, in contrast, the 40Ar intensities decrease linearly with inlet time. This indicates that the gases have been cleaned up effectively, and the 40Ar/39Ar results yield ages with errors in ±0.4%. The OGRS is very helpful to obtain high-quality analysis data. 展开更多
关键词 40Ar/39Ar dating Gas purification technique Organic impurity Noble gas
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