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Characteristic Parameters for Dendritic Microstructure of Solidification During Slab Continuous Casting

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Journal of Iron and Steel Research International 2009年第1期16卷 17-21页

作者： GUO wei ZHU miao-yong School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China

The operating conditions during the continuous casting process have a great effect on the microstructure of slab solidification, including primary and secondary dendritic arm spacing. On the basis of the analysis of available work, a revised expression for describing secondary dendritic arm spacing during solidification of slab continuous casting was presented, and the relation between the ratio of primary dendritic arm spacing to secondary dendritic arm spacing and the cooling rate was obtained.

关键词： slab continuous casting dendritic solidification microstructure dendritic arm spacing

The Optical Properties of Nanostructured Ta_2O_5 Films

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稀有金属材料与工程 2006年第A03期35卷 488-489页

作者： Minmin Zhu wei miao Zhengjun Zhang Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

Amorphous Ta_2O_5 films were prepared on Si (100) substrates by thermal *** film consisted of amorphous Ta_2O_5 nanostructure that grew vertically and compactly at a large *** was found that Ta_2O_5 films became crystalline when annealed at or above 650℃and remained amorphous below 650℃.The effects of annealing on the optical properties of Ta_2O_5 film were also *** is estimated that the refraction indexes and the optical energy gaps of both amorphous Ta_2O_5 film and crystal one are *** optical energy gap of as-deposited Ta_2O_5 film is about 4.81 *** above results indicate that Ta_2O_5 films have a promising application in the optical devices.

关键词： Ta2O5 film optical property

Graphene/γ-AlOOH Hybrids as an Enhanced Sensing Platform for Ultrasensitive Stripping Voltammetric Detection of Pb（II）

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Chemical Research in Chinese Universities 2015年第4期31卷 590-596页

作者： FAN wei miao Yue'e LIU Tianxi State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200433 P. R. China

The reduced graphene oxide（RGO）/γ-A1OOH hybrids with different γ-AlOOH contents were successfully prepared via a facile one-pot hydrothermal method. In these hybrids, RGO acts as a conductive linker for improving electron transport, and γ-AlOOH nanoplatelets help to adsorb the target metal ions on the electrode surface, thus faci- litating the electrochemical behavior of the hybrids. The sensitivity of as-prepared RGOγ-AlOOH hybrids toward Pb（II） was tested by square wave anodic stripping voltammograms（SWASV）and the mass ratio of graphene to γ-AlOOH was optimized to improve the sensing performance of RGOγ-AlOOH hybrids. Owing to the superior ab- sorbability of γ-AlOOH for heavy metal ions and excellent electrical conductivity of graphene, the detection limit of the hybrids for heavy metal ions was found to be as low as 1.5× 10^-11 mol/L with optimized γ-AlOOH content in the hybrids. The experimental conditions, such as pH value, mass of electrode material, and deposition time were also investigated and optimized. The as-prepared RGOγ-AlOOH hybrids demonstrate high electrochemical activity and good sensing performance, which offers an alternative platform for the electrochemical sensors.

关键词： Graphene γ-AlOOH Hybrid Heavy metal ion Electrochemical sensor

Thermal stability and sputtering resistance under irradiation of yttria dispersed ferrum films

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Rare Metals 2011年第3期30卷 258-261页

作者： LI Zhengcao YU Xiaoyi miao wei ZHANG Zhengjun State Key Laboratory of New Ceramic and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

Oxide dispersion strengthened （ODS） steels are considered as potential candidates for high temperature applications in fusion reactors be-cause of their excellent thermal creep behavior. In the present work, the double-target magnetron co-sputtering method was recommended to prepare yttria dispersed ferrum films. Vacuum annealing and ion irradiation were carried out to study the surface topography and structural features of the prepared yttria dispersed ferrum samples. Experiments proved that while the yttria doping ratio in the ferrum film increases, the recrystallization temperature of the film will be enhanced and the sputtering damage by Xenon ion irradiation will be lowered. The sput-tering resistance of the obtained films would be improved with the growing of grains under vacuum annealing.

关键词： ferrum yttria dispersion magnetron sputtering resistance thermal properties irradiation

Influence of vacuum annealing and irradiation on magnetic properties of Fe-3% Y_2O_3 films

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Rare Metals 2011年第5期30卷 453-457页

Yttria （Y） dispersed ferrum （Fe） films were prepared by a double-target magnetron co-sputtering method. Vacuum annealing and xenon ion irradiation were conducted to investigate the influence on the magnetic and mechanical properties of the films. The crystal grain growth mechanism and second phase precipitation mechanism were conducted simultaneously in the vacuum annealing process. These two effects led to an opposite variation of nano-hardness and coercivity in the films. Xenon ion irradiation played a role in rapid annealing, which also affected the magnetic performance of the yttria dispersed ferrum films.

关键词： magnetic films yttria magnetron sputtering annealing irradiation magnetic properties

Analysis of the sediment sources of flood driven erosion and deposition in the river channel of the Fu River Basin

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International Journal of Sediment Research 2023年第5期38卷 653-661页

作者： Shanghong Zhang Xujian Hu wei miao Zan Xu School of Water Resources and Hydropower Engineering North China Electric Power University

Studying the characteristics of runoff and sediment processes and revealing the sources of sediment provide key guidance for the scientific formulation of relevant soil erosion protection measures and water conservancy development plans. In the current study, the flow and sediment data of five hydrological stations on the main stream of the Fu River Basin(FRB) from 2007 to 2018 were selected to identify flood events, explore the variation of sediment transport along the FRB, and clarify the sediment sources. The results found that the Jiangyou—Fujiangqiao section is the main source of sediment in the FRB during the flood season. The runoff volume and sediment load during flood events in the Jiangyou—Fujiangqiao section accounted for 35% and 145% respectively of that of Xiaoheba station. These results combined with the change of the sediment load before and after the 2008 Wenchuan Earthquake(May12) show that the sediment in this section mainly comes from the Fu River tributary—the Tongkou River watershed. The calculation results for the sediment carrying capacity of the Fu River show that the main stream was in a state of erosion in theory. However, according to the calculation results for the interval sediment yield during flood events, the sediment load at the Xiaoheba station was smaller than that at the Shehong station upstream. The analysis indicates that this was not because of sediment deposition in the river channel, but because of sand mining in the river channel and sediment interception by water conservancy projects. If heavy rainfall occurs in the FRB, the sediment accumulated upstream will move downstream with the resulting flood, and the sediment yield in the FRB may further increase. These research conclusions can provide reference information for improving the prediction and management ability of soil and water loss in the FRB and scientific regulation of the Three Gorges Reservoir.

关键词： Flood event Fu River Basin (FRB) Sediment source Channel erosion and deposition Sediment carrying capacity

Sinicisation and ethnicity: spatial characteristics of Shui vernacular architecture in Guizhou, Southwest China

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Built Heritage 2020年第3期4卷 31-46页

作者： Yizhi Zhou miao wei College of Architecture and Urban Planning Tongji UniversityShanghai 200092China H+Architecture and Engineering Co. Ltd1728-2Shanghai 200433China

The Shui people are an ethnic minority living in southern mountainous areas of Guizhou Province,China;they have retained many vernacular houses with a history of over a *** spatial analysis software depthmapX to perform visibility graph analysis and field-of-view analysis with space syntax,we examined the sequence,organisation,and hierarchy of the living space in Shui *** found that those residences were influenced by external cultures,resulting in two types of plan layout:front-middle-back(type A)and left-middle-right(type B).Those two types of spatial combination were evident in two different line-of-sight *** type A,the hearth was the core and served as the daily living space of the *** type B,the ancestral altar was the core and served as the ritual *** historical coexistence and changing relationship of the two axes reflect cultural exchange between the Shui and Han as well as with other foreign *** study concludes that the diversity of spatial forms that developed in different historical periods is an important attribute of Shui houses and those of other ethnic minorities in Southwest China.

关键词： Vernacular architecture Shui ethnic group Spatial analysis Sinicisation Ethnicity Cultural exchange

Multi-scale fusion residual encoder-decoder approach for low illumination image enhancement

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The Journal of China Universities of Posts and Telecommunications 2022年第2期29卷 63-72页

作者： Pan Xiaoying wei miao Wang Hao Jia Fengzhu School of Computer Science and Technology Xi'an University of Posts and TelecommunicationsXi'an 710121China Shaanxi Key Laboratory of Network Data Analysis and Intelligent Processing Xi'an University of Posts and TelecommunicationsXi'an 710121China School of Software Northwestern Polytechnical UniversityXi'an 710072China

The sensing light source of the line scan camera cannot be fully exposed in a low light environment due to the extremely small number of photons and high noise,which leads to a reduction in image quality.A multi-scale fusion residual encoder-decoder(FRED)was proposed to solve the *** directly learning the end-to-end mapping between light and dark images,FRED can enhance the image’s brightness with the details and colors of the original image fully restored.A residual block(RB)was added to the network structure to increase feature diversity and speed up network ***,the addition of a dense context feature aggregation module(DCFAM)made up for the deficiency of spatial information in the deep network by aggregating the context’s global multi-scale *** experimental results show that the FRED is superior to most other algorithms in visual effect and quantitative evaluation of peak signal-to-noise ratio(PSNR)and structural similarity index measure(SSIM).For the factor that FRED can restore the brightness of images while representing the edge and color of the image effectively,a satisfactory visual quality is obtained under the enhancement of low-light.

关键词： image enhancement low illumination feature fusion residual network

Synthesis and Structure of Zinc Complex of N, N-bis ( benzimidazol-2-yl-methyl ) amine

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Chinese Chemical Letters 2001年第6期12卷 563-564页

作者： Xiao Lan LIU Qing Yan CHENG Xia YANG Zhi wei miao wei LIU Fang Ming miao College of Chemistry and Life Science Tianjin Normal UniversityTianjin 300074

The Zinc complex of N, N-bis (benzimidazol 2-yl-methy])amine has been synthesized and its crystal structure determined by X-ray diffraction method. The structure features of the complex are described.

关键词： Zinc compex N N-bis (benzimidazol-2-yl-methyl)amine superoxide dismutase (SOD)