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Novel mechanism for the modification of Al_2O_3-based inclusions in ultra-low carbon Al-killed steel considering the effects of magnesium and calcium

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International Journal of Minerals,Metallurgy and Materials 2018年第3期25卷 280-287页

作者： Jing guo Shu-sen Cheng han-jie guo Ya-guang Mei School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing Key Laboratory of Special Melting and Reparation of High-end Metal Materials University of Science and Technology Beijing

Many researchers have explored the inclusion modification mechanism to improve non-metallic inclusion modifications in steelmaking. In this study, two types of industrial trials on inclusion modifications in liquid steel were conducted using ultra-low-carbon Al-killed steel with different Mg and Ca contents to verify the effects of Ca and Mg contents on the modification mechanism of Al_2O_3-based inclusions during secondary refining. The results showed that Al_2O_3-based inclusions can be modified into liquid calcium aluminate or a multi-component inclusion with the addition of a suitable amount of Ca. In addition, [Mg] in liquid steel can further reduce CaO in liquid calcium aluminate to drive its evolution into CaO–MgO–Al_2O_3 multi-component inclusions. Thermodynamic analysis confirmed that the reaction between [Mg] and CaO in liquid calcium aluminate occurs when the MgO content of liquid calcium aluminate is less than 3 wt% and the temperature is higher than 1843 K.

关键词： inclusions mechanism modification ultra-low carbon Al-killed steel calcium treatment magnesium content

Scalable Reaction-spinning of Rigid-rod Upilex-S^(■) Type Polyimide Fiber with an Ultrahigh T_(g)

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Chinese Journal of Polymer Science 2021年第5期39卷 592-600,I0007页

作者： sen-sen Zheng han Dong Shi-Hua Wang Jie Dong Tao guo Xin Zhao Qing-Hua Zhang Shanghai Collaborative Innovation Center for High Performance Fiber Composites Engineering Research Center of Technical TextilesMinistry of EducationDonghua UniversityShanghai201620China Jiangsu Aoshen Hi-Tech Materials Co. Ltd.Lianyungang 222000China

In the family of polyimide(PI)materials,Upilex-S^(■) film has been a shining star through the research PI materials due to its appealing ***,the wholly rigid-rod backbone and easily formed skin-core micromorphology and microvoids of Upilex-S~type PI lead to the high difficulty in melt-and wet-spinning ***,we propose a facile and scalable method,reaction-spinning,to fabricate the Upilex-S^(■) type PI fiber,in which the rapid solidification of spinning dope and partial imidization take place ***,the stability and mechanical strength of as-spun fibers can be improved,and the microvoids in fibers can be greatly reduced in relative to the wet-spun *** resultant Upilex-S^(■) type PI fiber shows higher tensile strength and modulus than most commercial thermal-oxidative polymeric fibers with an ultrahigh glass transition temperature T_(g) of 478℃.Moreover,the WAXS and SAXS results indicate that orthorhombic crystals are formed for Upilex-S^(■) type PI fiber in the post hot-drawing *** the hot-drawing temperature results in a continuous crystallization and high orientation of PI chains in amorphous phase and perfects the existing lamellar structure,which make a great contribution to the improved mechanical property.

关键词： Polyimide fiber Reaction-spinning Ultrahigh T_(g) Crystal structure

Evaluation method and optimization strategies of resilience for air&space defense system of systems based on kill network theory and improved self-information quantity

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Defence Technology（防务技术） 2023年第3期21卷 219-239页

作者： Qi han Bo Pang sen Li Ning Li Peng-song guo Cheng-li Fan Wei-min Li Air Defense and Antimissile School Air Force Engineering UniversityXi’an710051China Graduate School Air Force Engineering UniversityXi’an710051China Information and Navigation School Air Force Engineering UniversityXi’an710077China School of Automation Science and Engineering Xi'an Jiaotong UniversityXi'an710049China

Resilience of air&space defense system of systems(SoSs)is critical to national air defense ***,the research on it is still *** this study,the resilience of air&space defense SoSs is firstly defined and the kill network theory is established by combining super network and kill chain *** cases of the SoSs are considered:(a)The kill chains are relatively homogenous;(b)The kill chains are relatively ***,two capability assessment methods,which are based on the number of kill chains and improved self-information quantity,respectively,are *** improved self-information quantity modeled based on nodes and edges can achieve qualitative and quantitative assessment of the combat capability by using linguistic Pythagorean fuzzy ***,a resilient evaluation index consisting of risk response,survivability,and quick recovery is proposed ***,network models for regional air defense and anti-missile SoSs are established respectively,and the resilience measurement results are verified and analyzed under different attack and recovery strategies,and the optimization strategies are also *** proposed theory and method can meet different demands to evaluate combat capability and optimize resilience of various types of air&space defense and similar SoSs.

关键词： network optimization theory

Self-adaptive bulk/surface engineering of Bi_(x)O_(y)Br_(z) towards enhanced photocatalysis:Current status and future challenges

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Journal of Energy Chemistry 2023年第7期82卷 387-413,I0009页

作者： Zhiwei Wu Bidyut Kumar Kundu Wanqiong Kang Lei Mao sen Zhang Lan Yuan Fen guo Chuang han Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials School of Chemistry and Chemical EngineeringWuhan University of Science and TechnologyWuhan 430081HubeiChina Department of Chemistry University of CincinnatiCincinnatiOH 45221United States The PLA Rocket Force Command College Wuhan 430012HubeiChina Engineering Research Center of Nano-Geomaterials of Ministry of Education Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina

The bulk/surface states of semiconductor photocatalysts are imperative parameters to maneuver their performance by significantly affecting the key processes of photocatalysis including light absorption,separation of charge carrier,and surface site *** years have witnessed the encouraging progress of self-adaptive bulk/surface engineered Bi_(x)O_(y)Br_(z) for photocatalytic applications spanning various ***,despite the maturity of current research,the interaction between the bulk/surface state and the performance of Bi_(x)O_(y)Br_(z) has not yet been fully understood and *** this regard,a timely tutorial overview is quite urgent to summarize the most recent key progress and outline developing obstacles in this exciting ***,the structural characteristics and fundamental principles of Bi_(x)O_(y)Br_(z)for driving photocatalytic reaction as well as related key issues are firstly ***,we for the first time summarized different self-adaptive engineering processes over Bi_(x)O_(y)Br_(z)followed by a classification of the generation approaches towards diverse Bi_(x)O_(y)Br_(z)*** features of different strategies,the up-to-date characterization techniques to detect bulk/surface states,and the effect of bulk/surface states on improving the photoactivity of Bi_(x)O_(y)Br_(z)in expanded applications are further ***,the present research status,challenges,and future research opportunities of self-adaptive bulk/surface engineered Bi_(x)O_(y)Br_(z)are *** is anticipated that this critical review can trigger deeper investigations and attract upcoming innovative ideas on the rational design of Bi_(x)O_(y)Br_(z)-based photocatalysts.

关键词： Bismuth oxybromide Self-adaptive engineering Pollutant degradation Energy application Photocatalysis

Formation mechanisms of water inrush and mud burst in a migmatite tunnel：a case study in China

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Journal of Mountain Science 2017年第1期14卷 188-195页

作者： WU guo-jun CHEN Wei-zhong YUAN Jing-qiang YANG Dian-sen BIAN han-bian State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China Research Center of Geotechnical & Structural Engineering Shandong University Jinan 250061 China LEM3 Universitd de Lorraine Ile du Saulcy Metz 57045 France

This paper presents a case study of water inrush and mud burst occurring in a migmatite tunnel to study its formation mechanisms. The geological investigation and mineralogical analysis showed that water inrush and mud burst in the migmatite was closely related to the component of the host rock. High content of soluble minerals,e.g.,calcite and dolomite,would make the migmatite rock prone to be fragmentized,isintegrated and eventually form different sorts of connected or semi-connected veins. The field exploration revealed most cavities in the magmatite tunnel were eroded by groundwater and formed large interconnected networks. The two faults and the dike in the magmatite tunnel became the preferred paths and provided great convenience for plenty of precipitation and mud slurry. Due to high water pressure and blast disturbance,the cavities can soon connect each other as well as all sorts of veins,forming a complex ground channel for water inrush and mud burst. To estimate the potential occurrenceof water inrush and mud burst,the water bursting coefficient was employed. The results showed the water bursting coefficient of the magmatite tunnel was much bigger than the threshold values and it can be used to explain the accident of water inrush and mud burst occurring in the magmatite tunnel.

关键词： Water inrush Mud burst Migmatite Formation mechanism Tunnel

Enhanced bioactivity and interfacial bonding strength of Ti3Zr2Sn3Mo25Nb alloy through graded porosity and surface bioactivation

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Journal of Materials Science & Technology 2022年第5期100卷 137-149页

作者： sen Yu Zhe Yu Dagang guo Hui Zhu Minghua Zhang Jianye han Zhentao Yu Yemin Cao Gui Wang State Key Laboratory for Mechanical Behavior of Materials School of Material Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Shaanxi Key Laboratory of biomedical metallic materials Northwest Institute for Non-ferrous Metal ResearchXi’an 710016China Orthopedics Oncology Institute of Chinese PLA Tangdu HospitalAir Force Medical UniversityXi’an 710038China Shanghai Hospital of Integrated Traditional Chinese and Western Medicine Shanghai University of Traditional Chinese MedicineShanghai 201203China Centre for Advanced Materials Processing and Manufacturing(AMPAM) The University of QueenslandSt LuciaQLD 4072Australia

The gradient porous Ti3Zr2Sn3Mo25Nb(TLM)alloy rods were fabricated through sintering the alloyed powder to a solid *** porous sample was then modified by a Micro Arc Oxidation(MAO)treatment in an electrolyte containing calcium and phosphate,a hydrothermal treatment enabled secondary microporous hydroxyapatite(HA)coating,and a further bone morphogenetic protein-2(BMP-2)loading treatment through immersion and *** treatment led to an orderly secondary microporous coating containing HA nano-particles and evenly distributed BMP-2 in the porous *** a result,osteoblasts could adhere and grow well on the coatings with a high cell adhesion rate and cell functional *** in-situ shear testing indicated that the interfacial strength had been enhanced *** of the bond formation and osseointegration with the titanium implant is attributed to increased surface area for the cell to attach,creating voids for the cell to grow in,and activating titanium surface by introducing bioactive ingredients such as HA and BMP-2.

关键词： Graded porosity titanium Secondary microporous Bioactivity Ti3Zr2Sn3Mo25Nb alloy Interface binding strength

Semisolid slurry of 7A04 aluminum alloy prepared by electromagnetic stirring and Sc, Zr additions

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China Foundry 2017年第3期14卷 188-193页

作者： Jun-wen Zhao An guo Hu Li Xu Zhang Jing han Shu-sen Wu Key Lab of Advanced Technologies of Materials (Ministry of Education) School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 China School of Mechanics and Engineering Southwest Jiaotong University Chengdu 610031 China State Key Lab of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan 430074 China

Slurry preparation is one of the most critical steps for semisolid casting, and its primary goal is to prepare slurry with uniformly distributed fine globules. In this work, electromagnetic stirring(EMS) and the addition of Sc and Zr elements were used to prepare semisolid slurry of 7A04 aluminum alloy in a large diameter slurry maker. The effects of different treatments on the microstructure, composition and their radial homogeneity were investigated. The results show that, compared to the slurry without any treatment, large volume slurry with finer and more uniform microstructure can be obtained when treated by EMS, Sc, or Zr additions individually. EMS is more competent in the microstructural and chemical homogenization of the slurry while Sc and Zr additions are more excellent in its microstructural refinement. The combined treatment of EMS, Sc and Zr produces premium 7A04 aluminum alloy slurry with uniformly distributed fine α-Al globules and composition. The interaction mechanism between EMS and Sc and Zr additions was also discussed.

关键词： aluminum alloy Zr and Sc additions semisolid slurry electromagnetic stirring(EMS) homogeneity

Genetic diversity and population structure of Robinia pseudoacacia from six improved variety bases in China as revealed by simple sequence repeat markers

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Journal of Forestry Research 2022年第2期33卷 611-621页

作者： Qi guo sen Cao Li Dong Xiuyu Li Jiangtao Zhang Yuanshuai Zhang Zijie Zhang Yuhan Sun Cui Long Yingming Fan Chao han Peiyao han Xiaodi Liu Yun Li Beijing Advanced Innovation Center for Tree Breeding By Molecular Design Engineering Technology Research Center of Black Locust of National Forestry and Grassland AdministrationCollege of Biological Sciences and TechnologyNational Engineering Laboratory for Tree BreedingBeijing Forestry UniversityBeijing 100083P.R.China College of Agriculture Henan University of Science and TechnologyLuoyang 471023P.R.China Henan Academy of Forestry Zhengzhou 450008P.R.China Feixian County State Owned Daqingshan Forest Farm Linyi 273400P.R.China

Robinia pseudoacacia is an important afforesta-tion tree introduced to China in *** the present study,we examined the genetic diversity among 687 strains rep-resenting four improved varieties and two secondary prov-enances,comprising 641 clones and 46 ***-one simple sequence repeats(SSRs)were selected through segregation analysis and polymorphism characterization,and all sampled individuals were genotyped using well-characterized SSR *** excluding loci with non-neutral equilibrium,missing locus data and null alleles,we used 36 primer pairs to assess the genetic diversity of these germplasm resources,revealing vast genetic differentiation among the samples,with an average of 8.352 alleles per locus and a mean Shannon′s index of *** the popula-tion level,the partitioning of variability was assessed using analysis of molecular variance,which revealed 93%and 7%variation within and among collection sites,*** clusters were detected using structure analysis,indi-cating a degree of genetic differentiation among the six *** into the genetic diversity and structure of *** provide a theoretical basis for the con-servation,breeding and sustainable development in China.

关键词： Robinia pseudoacacia Genetic diversity Genetic differentiation Microsatellite Population structure Black locust

Genome-wide identification and expression analysis of asparagine synthetase family in apple

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Journal of Integrative Agriculture 2020年第5期19卷 1261-1273页

作者： YUAN Xi-sen YU Zi-peng LIU Lin XU Yang ZhanG Lei han De-guo ZhanG Shi-zhong State Key Laboratory of Crop Biology Shandong Agricultural UniversityTai’an 271018P.R.China Shandong Peanut Research Institute Shandong Academy of Agricultural SciencesQingdao 266100P.R.China College of Horticulture&Landscape Architecture Northeast Agricultural UniversityHarbin 150030P.R.China

Asparagine is an efficient nitrogen transport and storage carrier. Asparagine synthesis occurs by the amination of aspartate which is catalyzed by asparagine synthetase(ASN) in plants. Complete genome-wide analysis and classifications of the ASN gene family have recently been reported in different plants. However, systematic analysis and expression profiles of these genes have not been performed in apple(Malus domestica). Here, a comprehensive bioinformatics approach was applied to identify MdASNs in apple. Then, plant phylogenetic tree, chromosome location, conserved protein motif, gene structure, and expression pattern of MdASNs were analyzed. Five members were identified and distributed on 4 chromosomes with conserved GATase-7 and ASN domains. Expression analysis indicated that all MdASNs mRNA accumulated at the highest level in reproductive organs, namely flowers or fruits, which may be associated with the redistribution of free amino acids in plant metabolic organs and reservoirs. Additionally, most of Md ASNs were dramatically up-regulated under various nitrogen supplies, especially in the aboveground part. Taken together, MdASNs may be assigned to be responsible for the nitrogen metabolism and asparagine synthesis in apple.

关键词： Malus domestica bioinformatics ASN family asparagine synthetase nitrogen metabolism