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Review of non-reactive CaO-Al2O3-based mold fluxes for casting high-aluminum steel

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Journal of Iron and Steel Research International 2019年第4期26卷 336-344页

作者： Lei Zhang Wan-lin Wang han-qing shao School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina

Advanced high-strength steels (AHSSs) have been gradually applied to modern auto industry, as they have the advantages of improving the steel strength and lightening the car weight, which not only ensures the safety but also saves the energy. However, the high-aluminum (Al) content in AHSSs may react with SiO2 in conventional CaO-SiO2-based mold flux during the process of continuous casting, which leads to the deterioration of the mold flux properties and a poor slab quality. Then, the non-reactive CaO-Al2O3-based mold flux was proposed and has been developing for the casting process of high-Al steels, but there are some problems of low consumption and insufficient lubrication that need to be solved. Thus, previous researches on the effect of each component on the properties of CaO-Al2O3-based mold flux were systematically summarized, and the situation of plant trials on CaO-Al2O3-based mold flux was evaluated. The results indicated that the proposed CaO-Al2O3-based mold fluxes could avoid the slag-metal reaction problems;however, the problems of lubri-cation, crystallization and heat transfer issues still exist. Therefore, tremendous works still need to be conducted for the development of new generation of CaO-Al2O3-based mold flux system. The review was performed aiming to provide a technical guidance for designing and optimizing CaO-Al2O3-based mold flux system that meets the demand of the continuous casting process of high-Al steels.

关键词： High-Al steel CaO-Al2O3-based mold flux Thermophysical property Lubrication Crystallization

Kondo-Fano Effect in T-shaped Double quantum Dots Coupled to Ferromagnetic Leads

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Communications in Theoretical Physics 2012年第1期57卷 161-165页

作者： HUANG Rui WU shao-quan HOU Tao College of Sciences Southwest Petroleum UniversityChengdu 610500China College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610068China

Using an equation-of-motion technique, we theoretically study the Kondo-Fano effect in the T-shaped double quantum dots coupled to two ferromagnetic leads by the Anderson Hamiltonian. We calculate the density of states in this system by solving Green function. Our results reveal that the density of states show some noticeable characteristics not only depending upon the interdot coupling tab, the energy level eal of the side coupled quantum dot QDb, and the relative angle θ of magnetic moment M, but also the asymmetry parameter a in ferromagnetic leads and so on. All these parameters greatly influence the density of states of the eentral quantum dot QDa. This system is a possible candidate for spin valve transistors and may have potential applications in the spintronies.

关键词： T-shaped double quantum dots Kondo-Fano effect density of states

Road to full bioconversion of biowaste to biochemicals centering on chain elongation: A mini review

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Journal of Environmental Sciences 2019年第12期31卷 50-64页

作者： Wenhao han Pinjing He Liming shao Fan Lü State Key Laboratory of Pollution Control and Resource Reuse Tongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Institute of Waste Treatment and Reclamation Tongji UniversityShanghai 200092China Centre for the Technology Research and Training on Household Waste in Small Toums&Rural Area Ministry of Housing and Urban-Rural Development of China(MOHURD)China

Production of biochemicals from waste streams has been attracting increasing worldwide interest to achieve climate protection *** elongation(CE)for production of mediumchain carboxylic acids(MCCAs,especially caproate,enanthate and caprylate)from diverse biowaste has emerged as a potential economic and environmental technology for a sustainable *** present mini review summarizes the research utilizing various synthetic or real waste-derived substrates available for MCCA ***,the microbial characteristics of the CE process are surveyed and *** that a large proportion of recalcitrantly biodegradable biowaste and residues cannot be further utilized by CE systems and remain to be treated and disposed,we propose here a loop concept of bioconversion of biowaste to MCCAs making full use of the biowaste with zero *** could make possible an alternative technology for synthesis of value-added products from a wide range of biowaste,or even non-biodegradable waste(such as,plastics and rubbers).Meanwhile,the remaining scientific questions,unsolved problems,application potential and possible developments for this technology are discussed.

关键词： Organic waste Waste valorization Chain elongation Medium-chain carboxylic acids Functional microbes Electron donors

Gravitational Field Excitation from the First Term of quantum Wilson Loop

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Communications in Theoretical Physics 2006年第1X期46卷 77-86页

作者： shao Liang shao Dan shao Chang-Gui H. Noda CHEN Yi-han Department of Applied Physics Wuhan University of Science and Technology Wuhan 430081 China Department of Physics Jianghan University Wuhan 430056 China Institute of Theoretical Physics Hubei University Wuhan 430062 China Department of Mathematical Sciences Ibaraki University Mito 310-8512 Japan

In 4-dimensional R-gravity, using the linear and square terms of the expanding expression of the space-time connection, we calculate the possible curvature excitation （order k^4） of gravitational field, which is given by the first term of quantum Wilson loop （w） through two-point Green＇s function of the connection. At the same time using the tree diagram propagators of gravitons, the lowest order （k^4） correction to （w） is also calculated through the graviton self-energy in the term. Under the accuracy condition up to order k^4, we have obtained a complete expression of the excitation contributed from the leading term （w^（2））of （w）.

关键词： excitation of gravitational field graviton self-energy correction complete expression of excitation of order k^4 in (w^(2))

Influence of Er_2O_3 content on microstructure and mechanical properties of ZTA-TiO_2 composites

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Journal of Rare Earths 2019年第3期37卷 299-304页

作者： Yudong Sui Li'na han Yehua Jiang quan Shan School of Materials Science and Engineering Kunming University of Science and Technology

The influence of Er_2 O_3 addition on the phase evolution and mechanical properties of sintered(1600 ℃,4 h) ZTA(yttria stabilized zirconia toughened alumina)-TiO_2 composites was investigated. The SEM and XRD results reveal the formation of a new erbium zirconium oxide,Zr_3 Er_4 O_(12),with a granulate morphology when Er_2 O_3 content is higher than 1 wt%. The grain sizes of both Al_2 O_3 and yttria-stabilized zirconia phases decrease with an increase in the Er_2 O_3 content. The relative density, Vickers hardness and fracture toughness of the composites are found to be strongly dependent on their grain sizes, relative densities and the formation of the Zr_3 Er_4 O_(12) secondary phases. The composite with 5 wt% Er_2 O_3 shows the highest relative density(99.93%), Vickers hardness(1752 HV) and fracture toughness(7.92 MPa·m^(1/2)).

关键词： Er2O3 Microstructure Vickers hardness Fracture toughness ZTA-TiO2 ceramic composite Rare earths

Unraveling the Mechanisms of Memory Extinction

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Neuroscience Bulletin 2018年第2期34卷 385-388页

作者： shao-Ling han Tian-Le Xu Collaborative Innovation Center for Brain Science Department of Anatomy and Physiology Shanghai Jiao Tong University School of Medicine

Memory is a crucial biological function conserved across almost all *** established and consolidated,a memory is considered stable and long-lasting unless it is disrupted or manipulated by behavioral,physical,or chemi...

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Land cover change in different altitudes of Guizhou-Guangxi karst mountain area, China： patterns and drivers

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Journal of Mountain Science 2017年第9期14卷 1873-1888页

作者： CHEN Tian-tian PENG Li LIU shao-quan WANG Qiang Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China University of Chinese Academy of Sciences Beijing 100049 China Chengdu University of Technology Chengdu 610059 China

Topography, especially altitude, will influence the way, process and characteristics of land cover changes in mountainous area, simultaneously, the vertical difference of land cover changes will affect soil quality and regional ecological environment. Therefore, the gradient relationship analysis between land cover changes and altitude is very important for regional sustainability. This study investigated land cover dynamics based on land cover data from a typical mountainous area in the Guizhou-Guangxi karst mountain area, China, in 2000 and 2010, then explored the relationship between altitude and land cover change and analyzed different drivers of land cover change at different altitudes. Our findings are as follows. 1) From 2000 to 2010, the total area of land cover transition was 7167.04 km^2 or 2.8% of the region. The increasing area of build-up land(926.23 km^2) was larger than that of forest(859.38 km^2), suggesting that the urban construction speed was higher than that of reforestation. 2) Intensity of land cover transition in northwestern Guizhou-Guangxi karst mountain area was much larger than that of southeast part and their transition trend was also significantly different, which was consistent with regional population and economy. 3) Human activity was the most dramatic at altitudes between 0–500 m. For 500–1000 m, grassland mainly converted to forest and build-up land. Area of land cover transition was the greatest between 1000–1500 m, while above 1500 m, the transition of grassland was the most obvious. 4) The drivers of land cover change varied. Land cover change was positively correlated with gross domestic product and population density but was inversely related to relief amplitude. There were correlations between land cover change and distance to roads and rivers, and their correlations varied with altitude. By revealing patterns and causes of land cover changes in different altitudes, we hope to understand the vertical dependence of land cover c

关键词： Land cover change Vertical difference Drivers Regional sustainability Guizhou-Guangxi karst mountain area

Evolution of plasticized MnO–Al2O3–SiO2-based nonmetallic inclusion in 18wt%Cr-8wt% Ni stainless steel and its properties during soaking process

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International Journal of Minerals,Metallurgy and Materials 2020年第3期27卷 328-339页

作者： Jing Guo Xing-run Chen shao-wei han Yan Yan han-jie Guo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Jiuquan Iron and Steel Group Corporation Jiayuguan 735100China Beijing Shougang Co.Ltd. Qian'an 064400China

The properties of MnO–Al2O3–SiO2-based plasticized inclusion are likely to change during soaking process due to its low melting point. In this study, the evolution of the MnO–Al2O3–SiO2-based inclusion of 18 wt%Cr-8 wt%Ni stainless steel under isothermal soaking process at 1250°C for different times was investigated by laboratory-scale experiments and thermodynamic analysis. The results showed that the inclusion population density increased at the first stage and then decreased while their average size first decreased and then increased. In addition, almost no Cr2O3-concentrated regions existed within the inclusion before soaking, but more and more Cr2O3 precipitates were formed during soaking. Furthermore, the plasticity of the inclusion deteriorated due to a decrease in the amount of liquid phase and an increase in the high-melting-pointphase MnO–Cr2O3 spinel after the soaking process. In-situ observations by high-temperature confocal laser scanning microscopy(CLSM) confirmed that liquid phases were produced in the inclusions and the inclusions grew rather quickly during the soaking process. Both the experimental results and thermodynamic analysis conclude that there are three routes for inclusion evolution during the soaking process. In particular, Ostwald ripening plays an important role in the inclusion evolution, i.e., MnO–Al2O3–SiO2-based inclusions grow by absorbing the newly precipitated smaller-size MnO–Cr2O3 inclusions.

关键词： nonmetallic inclusion soaking process Ostwald ripening stainless steel

iTRAQ-based quantitative analysis of cancer-derived secretory proteome reveals TPM2 as a potential diagnostic biomarker of colorectal cancer

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Frontiers of Medicine 2016年第3期10卷 278-285页

作者： Yiming Ma Ting Xiao quan Xu Xinxin shao Hongying Wang State Key Laboratory of Molecular Oncology Beijing 100021 China Department of Gastrointestinal Cancer Surgery National Cancer Center/Cancer Hospital Chinese Academy of Medical Sciences and Petting Union Medical College Beijing 100021 China

Colorectal cancer （CRC） is a leading cause of cancer-related deaths worldwide. We aimed to find novel molecules as potential biomarkers for the early diagnosis of CRC. A serum-free conditioned medium was successfully collected from three pairs of CRC tissue and adjacent normal tissue, iTRAQ-based quantitative proteomic analysis was applied to compare the differences in secretome between primary CRC mucosa and adjacent normal mucosa. A total of 145 kinds of proteins were identified. Of these proteins, 29 were significantly different between CRC and normal tissue. Tropomyosin 2 p （TPM2） exhibited the most significant differences; as such, this protein was selected for further validation. quantitative real-time PCR indicated that the mRNA expression of TPM2 significantly decreased in the CRC tissue compared with the paired adjacent normal tissue. Immunohistochemical analysis also confirmed that TPM2 was barely detected at protein levels in the CRC tissue. In summary, this study revealed potential molecules for future biomarker applications and provided an efficient approach for the differential analysis of cancer-associated secretome. TPM2 may be valuable for the early diagnosis of CRC.

关键词： iTRAQ secretome colorectal cancer TPM2