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过驳作业的系泊安全与管理 被引量:2
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作者 庄东晓 《广州航海高等专科学校学报》 1998年第2期19-22,共4页
通过分析过驳作业的系泊系统在外力作用下影响及过驳本身特点,讨论好过驳作业的系泊安全与管理。
关键词 过驳作业 系泊 骤力 颠簸 安全管理
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Study on the Design Criteria for Prestressed Concrete Pavements
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作者 孙宝俊 RogerK.Hawkins 吕志涛 《Journal of Southeast University(English Edition)》 EI CAS 2000年第1期80-88,共9页
With a concrete pavement slab prestressed, its load carrying capacity can be significantly increased; thus a thinner slab may be used for the same loading. Prestressing modify the structural behavior of the pavement ... With a concrete pavement slab prestressed, its load carrying capacity can be significantly increased; thus a thinner slab may be used for the same loading. Prestressing modify the structural behavior of the pavement slab and there is a greater resistance to impact, vibration and overloading. This paper discusses the major design considerations necessary in the successful construction of prestressed concrete pavements and presents a design procedure developed to predict the compressive stress due to prestressing in the pavements at early stage, during service and after cracking. Variation in the approach for repetitive and nonrepetitive loads is clearly distinguished. Check on the recovery after cracking for overloading in prestressed pavements is also needed. Finally, a design example is illustrated the application of the approach developed. 展开更多
关键词 design criteria prestressed concrete pavements design procedure PRESTRESSING recovery after cracking
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Reductive kinetics of Panzhihua ilmenite with hydrogen 被引量:4
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作者 Chang-yuan LU Xing-li ZOU +5 位作者 Xiong-gang LU Xue-liang XIE Kai ZHENG Wei XIAO Hong-wei CHENG Guang-shi LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第12期3266-3273,共8页
The hydrogen reduction of Panzhihua ilmenite concentrate in the temperature range of 900?1050 °C was systematicallyinvestigated by thermogravimetric analysis (TG), X-ray diffraction (XRD) and scanning electron mi... The hydrogen reduction of Panzhihua ilmenite concentrate in the temperature range of 900?1050 °C was systematicallyinvestigated by thermogravimetric analysis (TG), X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods. It wasshown that the products of the Panzhihua ilmenite reduced at 900 °C were metallic iron and rutile. Above 1000 °C, ferrouspseudobrookite solid solution was generated. During the reduction process, element Mg gradually concentrated to form Mg-rich zonewhich can influence the metallization process. The reduction reaction proceeded topochemically and its related reduction kineticswere also discussed. The kinetics of the reduction indicated that the rate-controlling step was the diffusion process. The apparentactivation energy of the hydrogen reduction of Panzhihua ilmenite was calculated to be 117.56 kJ/mol, which was larger than that ofsynthetic ilmenite under the same reduction condition. 展开更多
关键词 Panzhihua ilmenite synthetic ilmenite hydrogen reduction KINETICS rate-controlling step magnesium migration
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Dynamic Kinetics of Methanol Synthesis over a Commercial Copper-Based Catalyst
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作者 陈晓春 李成岳 饶国瑛 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2000年第4期315-320,共6页
Adsorption, surface reaction and process dynamics on the surface of a commercial copper-based catalyst for methanol synthesis from CO/CO2/H2 were systematically studied by means of temperature programmed desorption (T... Adsorption, surface reaction and process dynamics on the surface of a commercial copper-based catalyst for methanol synthesis from CO/CO2/H2 were systematically studied by means of temperature programmed desorption (TPD), temperature programmed surface reaction (TPSR), in-situ Fourier transform-inferred spec-troscopy(FTIR) and stimulus-response techniques. As a part of results, an elementary step sequence was suggested and a group of ordinary differential equations (ODEs) for describing transient conversations relevant to all species on the catalyst surface and in the gas phase in a micro-fixed-bed reactor was derived. The values of the parameters referred to dynamic kinetics were estimated by fitting the solution of the ODEs with the transient response data obtained by the stimulus-response technique with a FTIR analyzer as an on-line detector. 展开更多
关键词 methanol synthesis copper-based catalyst dynamic kinetics elementary step sequence parameter estimation
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Chemical looping based ammonia production--A promising pathway for production of the noncarbon fuel 被引量:2
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作者 Qinghua Lai Tianyi Cai +11 位作者 Shik Chi Edman Tsang Xia Chen Runping Ye Zhenghe Xu Morris D.Argyle Dong Ding Yongmei Chen Jianji Wang Armistead G.Russell Ye Wu Jian Liu Maohong Fan 《Science Bulletin》 SCIE EI CAS CSCD 2022年第20期2124-2138,M0004,共16页
Ammonia, primarily made with Haber-Bosch process developed in 1909 and winning two Nobel prizes, is a promising noncarbon fuel for preventing global warming of 1.5 °C above pre-industrial levels. However,the unde... Ammonia, primarily made with Haber-Bosch process developed in 1909 and winning two Nobel prizes, is a promising noncarbon fuel for preventing global warming of 1.5 °C above pre-industrial levels. However,the undesired characteristics of the process, including high carbon footprint, necessitate alternative ammonia synthesis methods, and among them is chemical looping ammonia production(CLAP) that uses nitrogen carrier materials and operates at atmospheric pressure with high product selectivity and energy efficiency. To date, neither a systematic review nor a perspective in nitrogen carriers and CLAP has been reported in the critical area. Thus, this work not only assesses the previous results of CLAP but also provides perspectives towards the future of CLAP. It classifies, characterizes, and holistically analyzes the fundamentally different CLAP pathways and discusses the ways of further improving the CLAP performance with the assistance of plasma technology and artificial intelligence(AI). 展开更多
关键词 Ammonia synthesis Chemical looping Nitrogen carrier Renewable fuels Energy carrier
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