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Influence of Heating Rate on Morphologies and Magnetic Properties ofα-Fe_(2)O_(3)

Chinese physics Letters 2012年第3期29卷 173-175页

作者： LI Zi-Yue ZHANG Hui-Min LIU Li-Hu SUN Hui-Yuan College of physics Science and Information Engineering Hebei Normal UniversityShijiazhuang 050024 Key Laboratory of Advanced Films of Hebei Province Hebei Normal UniversityShijiazhuang 050024

A variety of hematite microstructures are synthesized through oxalic acid-assisted thermal treatment of iron films sputtered onto glass ***-likeα-Fe_(2)O_(3)nanoslices and honeycomb-likeα-Fe_(2)O_(3)particles of micrometer sizes are obtained after annealing at 500℃but with different rates of heating to the final annealing *** and morphologies of the samples are studied by means of x-ray diffraction,scanningelectron microscopy and atomic force *** structures are believed to be formed during the period of increasing temperature to the final annealing ***-quantum-interference-device magnetometer measurements show room-temperature ferromagnetism in these samples.

关键词： temperature annealing

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delay-dependent Stability of Uncertain distributed Time-delay Systems

Delay-dependent Stability of Uncertain Distributed Time-dela...

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2012 3rd International Conference on Information Technology for Manufacturing Systems(ITMS 2012)

作者： Cheng Wang Qing Zhang Jianping Gan College of Mathematics and Computer Science Huanggang Normal University Institute of demographic Ecology and Resources Management Huanggang Normal University

In this paper, the problem of stability analysis of uncertain distributed time-delay systems is investigated. Systems with norm-bounded parameter uncertainties are considered. By taking suitable Lyapunov-Krasovskii functional and free weighting matrices, a delay-dependent sufficient condition is derived in terms of linear matrix inequality(LMI). The condition obtained in this paper can be tested numerically very efficiently using interior point algorithms.

关键词： delay-dependent stability time-delay linear matrix inequality(LMI)

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Optimization of Conditions of Concentrating Protein in Rapeseed Meal by Ultrasonic-assisted Alcohol Washing

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Agricultural Biotechnology 2017年第5期6卷 66-68,71页

作者： Wensong LI Yuane ZHANG Wen NIE Jianfeng ZHAN College of Life Sciences Huanggang Normal UniversityHuanggang 438000China Hubei Collaborative Innovation Center for the Characteristic Resources Exploitation of dabie Mountains Huanggang Normal UniversityHuanggang 438000China

This study was performed to optimize the conditions for concentrating protein in commercial rapeseed meal by ultrasonic-assisted alcohol washing method. The effects of sonication time,particle size,ultrasonic power and liquid to solid ratio on protein content were investigated. The result showed that the optimal conditions for concentrating protein in rapeseed meal were: sonication time of 40 min,particle size of 40 mesh,ultrasonic power of 800 W and liquid to solid ratio of 9∶ 1. Under these conditions,the protein content in rapeseed meal was increased to 55. 47%,which was 10. 43% higher than that in rapeseed meal not treated by sonication.

关键词： Rapeseed meal Ultrasound Alcohol washing Protein Concentration

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The Characteristics of Soil Nutrients in Terracing Land under different Land Use Patterns in Three Gorges Reservoir Area

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Asian Agricultural Research 2017年第3期9卷 89-92页

作者： Guojian CHEN Chunli LI Juanjuan LI Liangyu LIAO Jie WEI Peixia LI College of Geography and Tourism Chongqing Normal University Chongqing Key Laboratory of Earth Surface Processes and Environmental Remote Sensing in Three Gorges Reservoir Area

In this study,taking the typical terracing land in Wushan County of Chongqing Municipality for example,we study the distribution of soil nutrients in the terracing land under different land use patterns in Three Gorges Reservoir Area. We conduct field survey and sampling on three different land use patterns( cash crop land,food crop land and abandoned land),and do the indoor experimental analysis of soil nutrient indicators. The results indicate that there is significant or very significant impact on soil nutrients under different land use patterns. The content of soil organic matter declines in sequence from abandoned land,food crop land to cash crop land; the content of soil N declines in sequence from cash crop land,abandoned land to food crop land; the content of soil P declines in sequence from cash crop land,food crop land to abandoned land; the content of soil K declines in sequence from abandoned land,cash crop land to food crop land. The result is in close relation to land use patterns,human cultivation activity,land disturbance and application of fertilizer.

关键词： Three Gorges Reservoir Area Terracing land Land use patterns Soil nutrients

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