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Characteristics of shell thickness in a slab continuous casting mold

International Journal of Minerals,Metallurgy and Materials 2009年第1期16卷 25-31页

作者： Di-feng Wu Shu-sen Cheng Zi-jian Cheng School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Steelmaking Plant Jiuquan Iron and Steel Co. Ltd. Jiayuguan 735100 China

The key to reduce shell breakout in the continuous casting process is to control shell thickness in the mold. A numerical simulation on the turbulent flow and heat transfer coupled with solidification in the slab mold using the volume of fluid （VOF） model and the enthalpy-porosity scheme was conducted and the emphasis was put upon the flow effect on the shell thickness profiles in longitudinal and transverse directions. The results show that the jet acts a stronger impingement on the shell of narrow face, which causes a zero-increase of shell thickness in a certain range near the impingement point. The thinnest shell on the slab cross-section locates primarily in the center of the narrow face, and secondly near the comer of the wide face. Nozzle optimization can obviously increase the shell thickness and make it more uniform.

关键词： continuous casting slab mold shell thickness nozzle optimization

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Facile Synthesis of Uniform Hollow Hematite Sub-micro Spheres with Controllable shell thickness

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Journal of Wuhan University of Technology(Materials Science) 2010年第1期25卷 32-38页

作者：闫共芹官建国 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

A simple method was developed to prepare the uniform hematite hollow submicro-spheres with controllable structure and different diameter based on monodisperse poly（styrene-co-acrylic acid） [P（St-co-AA）] particles. The structure and formation mechanism of the hollow spheres were investigated in detail. The control mechanism of shell thickness was also discussed. The results indicated that the shell thickness and coarseness of the synthesized core-shell hematite hollow spheres could be tuned simply by the surface carboxyl content of the P（St-co-AA） particles. This method provided a new approach for the structure control in the preparation of hollow spheres. A Brunauer-Emmett-Teller （BET） test shows that the prepared hollow spheres have large surface areas which were decreased along with the increase of the diameter. The magnetic properties of the as-obtained hematite hollow spheres were investigated. The result showed that the coercivity and saturated magnetization were increased along with the increase of the shell thickness, and the remanent magnetization was increased along with the decrease of the diameter.

关键词： hollow spheres hematite shell thickness BET special surface area magnetization properties

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A Comparative Study on the Buoyancy of Resting Eggs from Different Artemia Populations, with Emphasis on Its Relationships with Habitat Salinity and Biometric Characters of Resting Eggs

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Journal of Ocean University of China 2022年第6期21卷 1585-1596页

作者： ZHOU Jiaxuan HUANG Zhike GUO Yan SUN Shichun The Key Laboratory of Mariculture(Ministry of Education) and Institute of Evolution&Marine BiodiversityOcean University of ChinaQingdao 266003China Xinjiang Uygur Autonomous Region Fisheries Research Institute Urumqi 830002China

The buoyancy of Artemia resting eggs is a feature with both biological and economic *** the buoyancy of resting eggs is dependent on the specific weight of the eggs or salinity of ambient water,we suppose that habitat salinity may exert a selection pressure on resting egg buoyancy,and thereby lower habitat salinity may result in better floating capacity of resting eggs and vice *** this study,we compared the floating capacity of resting eggs from 25 Artemia *** results showed that the floating capacity of resting eggs varied greatly among different *** minimum salinity to float some eggs varied from 0 to *** salinity at which all resting eggs floated varied from 80 to *** FS_(50)(salinity with 50%eggs floating)of Zhundong and Yuncheng population was not detectable(over 50%eggs floating in distilled water),that of Kyêbxang Co population was 4.3,while the maximum value found in Dabancheng population was *** terms of the‘apparent specific weight’of resting eggs,18 populations exhibited a single-peak distribution pattern,while the other 7 populations showed a multiple-peak or non-peak *** correlations were found between FS50 and chorion thickness,and between FS_(50) and the volume percentage of the chorion in eggs,supporting a previous standpoint that shell thickness was a determinative factor for the floating capacity of resting eggs.A positive correlation was determined between FS50 and habitat *** hypothesis that habitat salinity may cause a directional selection on the buoyancy of resting eggs seems to be true.

关键词： brine shrimp cyst floating capacity shell thickness

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