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Inclusions and solidification structures of high pure ferritic stainless steels dual stabilized by niobium and titanium

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Rare Metals 2014年第6期33卷 761-766页

作者： Hong-Po Wang Li-Feng Sun jun-jie shi Cheng-jun Liu Mao-Fa Jiang Chi Zhang Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Northeastern University

As the raw materials in the post process of rolling and heat treatment, ingots have great effects on the properties of the final products. Inclusions and solidification structures are the most important aspects of the quality of ingots. Niobium and titanium are usually used to react with carbon and nitrogen to improve the properties of ferritic stainless steels. In this research, combined with thermodynamic calculation, effects of niobium and titanium on the inclusions and solidification structures in three kinds of high pure ferritic stainless steels with different titanium additions were investigated by optical microscope（OM）, scanning electron microscope（SEM）, transmission electron microscope（TEM）, and energy disperse spectrometer（EDS）. Results show that Al2O3 and a few（Nb,Ti）N particles form when titanium addition is 0.01 %.Furthermore, inclusions are mainly Ti N and Al2O3–Ti Ox–Ti N duplex inclusions when titanium addition is more than0.10 %. Those two types of inclusions are in well distribution, and can afford nuclei to the solidification ***, the ratio of equiaxed zone increases with the increase of titanium addition. The ratio increases from42.1 % to 64.0 % with the titanium addition increasing from 0.01 % to 0.10 %, and it increases to 85.7 % when the titanium addition reaches 0.34 %.

关键词： High pure ferritic stainless steel Inclusion Solidification structure Equiaxed zone Stabilization element

Large eddy simulation of cavitating flows with dynamic adaptive mesh refinement using OpenFOAM

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Journal of Hydrodynamics 2020年第2期32卷 398-409页

作者： Lin-min Li Dai-qing Hu Yu-cheng Liu Bi-tao Wang Chen shi jun-jie shi Chang Xu College of Energy and Electrical Engineering Hohai UniversityNanjing211100China College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing210098China Anhui Jinzhai Pumped Storage Power Co. LtdLu’an237300China

Cavitating flows are dominated by large gradients of physical properties and quantities containing complicated interfacial structures and lots of multi-scale eddies that need to be accurately characterized using a high-resolution *** present work,within OpenFOAM,proposes an effective modeling framework using the large eddy simulation(LES)approach along with the volume of fluid(VOF)method to simulate the two-phase flow system and applies the Schnerr-Sauer model to calculate the mass-transfer rate between water and *** adaptive mesh refinement(AMR)which is a powerful tool for allocating high-resolution grids only to the region of the greatest concern is adopted for improving the solution of interfacial *** effect of grid size is firstly investigated and the time-averaged quantities are verified against the experimental data,and then simulations of cavitating flows are successfully achieved to precisely characterize the features of cavitation with automatically and dynamically refining the *** the refinement only takes place in the interfacial region,high-precision simulations can be achieved with limited computational resources,and the method shows promising prospects for modeling of the multi-scale,time-critical and computationally intensive cavitating flows.

关键词： Cavitating flows large eddy simulation(LES) multi-scale adaptive mesh refinement(AMR) OpenFOAM

A semi-analytical pressure and rate transient analysis model for inner boundary and propped fractures exhibiting dynamic behavior under long-term production conditions

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Petroleum Science 2024年第4期21卷 2520-2535页

作者： Lin-Song Cheng Chong Cao Quan-Yu Pan Pin Jia Ren-Yi Cao Zhi-Kai Wang jun-jie shi College of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249China Sinopec Petroleum Exploration and Production Research Institute Beijing100083China CNOOC Research Institute Beijing100028China State Key Laboratory of Water Resources Protection and Utilization in Coal Mining Beijing112211China

The loss of hydrocarbon production caused by the dynamic behavior of the inner boundary and propped fractures under long-term production conditions has been widely reported in recent ***,the quantitative relationships for the variations of the inner boundary and propped fractures have not been determined and incorporated in the semi-analytical models for the pressure and rate transient *** work focuses on describing the variations of the inner boundary and propped fractures and capturing the typical characteristics from the pressure transient curves.A generalized semi-analytical model was developed to characterize the dynamic behavior of the inner boundary and propped fractures under long-term production *** pressure-dependent length shrinkage coefficients,which quantify the length changes of the inner zone and propped fractures,are modified and incorporated into this multi-zone semi-analytical *** simultaneous numerical iterations and numerical inversions in Laplace and real-time space,the transient solutions to pressure and rate behavior are determined in just a few *** dynamic behavior of the inner boundary and propped fractures on transient pressure curves is divided into five periods:fracture bilinear flow(FR1),dynamic PFs flow(FR2),inner-area linear flow(FR3),dynamic inner boundary flow(FR4),and outer-area dominated linear flow(FR5).The early hump during FR2 period and a positive upward shift during FR4period are captured on the log-log pressure transient curves,reflecting the dynamic behavior of the inner boundary and propped fractures during the long-term production *** transient pressure behavior will exhibit greater positive upward trend and the flow rate will be lower with the shrinkage of the inner *** pressure derivative curve will be upward earlier as the inner boundary shrinks more *** lower permeability caused by the closure of un-propped fractures in the inner zone results in gr

关键词： Semi-analytical model Length shrinkage Dynamic behavior Boundary changes Transient behavior

The 2D InSe/WS2 Heterostructure with Enhanced Optoelectronic Performance in the Visible Region

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Chinese Physics Letters 2019年第9期36卷 41-45页

作者： Lu-Lu Yang jun-jie shi Min Zhang Zhong-Ming Wei Yi-Min Ding Meng Wu Yong He Yu-Lang Cen Wen-Hui Guo Shu-Hang Pan Yao-Hui Zhu Physics Department Beijing Technology and BusinessUniversityBeijing100048 State Key Laboratory forArtificialMicrostructures and Mesoscopic Physics School of PhysicsPekingUniversityBeijing100871 College of Physics and Electronic Information Inner Mongolia NormalUniversityHohhot010022 State Key Laboratory of Superlattices and Microstructures Institute of Semicond uctorsChinese Academy of Sciences&College of Materials Science andOpto ElectronicTechnologyUniversity of Chinese Academy of SciencesBeijing100083

Two-dimensional(2D)InSe and WS2 exhibit promising characteristics for optoelectronic ***,they both have poor absorption of visible light due to wide bandgaps:2D InSe has high electron mobility but low hole mobility,while 2D WS2 is on the *** propose a 2D heterostructure composed of their monolayers as a solution to both *** first-principles calculations show that the heterostructure has a type-Ⅱband alignment as ***,the bandgap of the heterostructure is reduced to 2.19 eV,which is much smaller than those of the *** reduction in bandgap leads to a considerable enhancement of the visible-light absorption,such as about fivefold(threefold)increase in comparison to monolayer InSe(WS2)at the wavelength of 490 ***,the type-Ⅱ band alignment also facilitates the spatial separation of photogenerated electron-hole pairs;i.e.,electrons(holes)reside preferably in the InSe(WS2)*** a result,the two layers complement each other in carrier mobilities of the heterostructure:the photogenerated electrons and holes inherit the large mobilities from the InSe and WS2 monolayers,respectively.

关键词： Se CBM The 2D InSe/WS2 Heterostructure with Enhanced Optoelectronic Performance in the Visible Region

Structural engineering of high-entropy alloys for advanced electrocatalytic reactions

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Tungsten 2025年第1期7卷 1-31页

作者： Qiao Xie Ying-jie Yu Hai-jun Zhang Ya-Ping Deng Wen Lei The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Department of Chemical Engineering Waterloo Institute for Sustainable Energy Waterloo Institute for Nanotechnology University of Waterloo

High-entropy alloys(HEAs) have emerged as promising candidates to replace traditional precious metal catalysts,owing to their unique chemical and physical *** review commences by revisiting the fundamental concepts of HEAs,including their synthesis methods and structural control strategies in *** underscores the critical role of meticulously manipulating both macroscopic and microscopic structures of the HEAs to optimize their catalytic performance.A deep understanding of the structure-activity relationship in HEAs across various configurations is pivotal in developing more effective *** review methodically encapsulates the research progress of structural control strategies for HEAs in achieving efficient energy conversion,with the aim of gaining a better understanding of the relationship between structure and *** review concludes by summarizing the current achievements and challenges,and suggestions for potential future directions of HEAs in the fields of energy conversion and environmental purification.

关键词： Electrocatalytic Energy conversion High-entropy alloys Structural modulation

Metal-organic frameworks with dinuclear metal centers for synergistically boosting CO2 photoreduction

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Science China Chemistry 2025年第1期68卷 201-208页

作者： Hui-Feng Wang Wen-jie shi Yu-Xin Yang Bao-Xia Dong Tong-Bu Lu Di-Chang Zhong School of Chemistry and Chemical Engineering Yangzhou University Institute for New Energy Materials and Low Carbon Technologies School of Materials Science and Engineering Tianjin University of Technology

Dinuclear metal synergistic catalysis （DMSC） has been proved powerful in boosting CO2reduction,while this has not been achieved in heterogeneous catalysts with long-range order *** this study,we,by introduction of metal catalytic centers into an indium-based metal-organic framework （MOF）,obtained a series of isostructural In-MOFs,including three MOFs with mononuclear metal catalytic center （M-In）,three MOFs with dinuclear homometallic catalytic centers （MM-In）,and three MOFs with dinuclear heterometallic catalytic centers (MM’-In,M/M’=Co（II）,Ni（II）,Zn（II）).It was found that all these MOFs can serve as catalysts for photochemical CO2reduction to *** with M-In,the catalytic activities of MM-In were obviously enhanced,and that of MM’-In was further significantly *** example,the CO yield of Co Zn-In reaches a record value of 12,700μmol g-1h-1,which is 4.0,8.1,9.4,and 18.6-fold higher than that of Co Co-In,Zn Zn-In,Co-In,and Zn-In,***,the catalytic activities of Co Ni-In and Ni Zn-In also show different fold increase than those of corresponding dinuclear homometallic and mononuclear metallic *** results of control experiments and theoretical calculation reveal that the higher catalytic activities of MM-In over M-In can be ascribed to the DMSC effect,and the higher catalytic activity of MM’-In over MM-In can be ascribed to the strengthened DMSC *** work reveals the relationship between DMSC effect and bimetal centers in CO2reduction,which provides new insights into the DMSC and paves a new way to design highly active catalysts for photochemical CO2reduction.

关键词： metal-organic frameworks dinuclear metal centers synergistic catalysis CO2 reduction photocatalysis

Industrial solid wastes to environmental protection materials for removal of gaseous pollutants:A review

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Green Energy & Environment 2025年第1期10卷 34-83页

作者： Jiacheng Bao Xin Sun Ping Ning Kai Li jie Yang Fei Wang Lei shi Maohong Fan Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming650500China College of Engineering and Physical Sciences and School of Energy ResourcesUniversity of WyomingLaramieWY82071USA College of Engineering Georgia Institute of TechnologyAtlantaGA30332USA

The application of industrial solid wastes as environmentally functional materials for air pollutants control has gained much attention in recent years due to its potential to reduce air pollution in a cost-effective *** this review,we investigate the development of industrialwaste-based functional materials for various gas pollutant removal and consider the relevant reaction mechanism according to different types of industrial solid *** see a recent effort towards achieving high-performance environmental functional materials via chemical or physical modification,in which the active components,pore size,and phase structure can be *** review will discuss the potential of using industrial solid wastes,these modified materials,or synthesized materials from raw waste precursors for the removal of air pollutants,including SO_(2),NO_(x),Hg^(0),H_(2)S,VOCs,and CO_(2).The challenges still need to be addressed to realize this potential and the prospects for future research *** suggestions for future directions include determining the optimal composition of these materials,calculating the real reaction rate and turnover frequency,developing effective treatment methods,and establishing chemical component databases of raw industrial solid waste for catalysts/adsorbent preparation.

关键词： Industrial solid waste Reaction mechanism Modification method Air pollutants

Identification of a dual functional betulinic acid analog for the treatment of osteoarthritis by phenotypic screening

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Science China Life Sciences 2025年第1期68卷 300-302页

作者： Ze-Min Lin Mai Xiang Wen-Hui Wei Shu-Hui Fan Li Chen jie Wang Xiao-Qian Yang Chun-Hao Yang shi-jun He Jian-Ping Zuo Laboratory of Immunopharmacology State Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of Sciences School of Pharmacy University of Chinese Academy of Sciences School of Pharmacy Nanjing University of Chinese Medicine State Key Laboratory of Drug Research Department of Medicinal ChemistryShanghai Institute of Materia MedicaChinese Academy of Sciences Innovation Research Institute of Traditional Chinese Medicine Shanghai University of Traditional Chinese Medicine Experiment Center for Science and Technology Shanghai University of Traditional Chinese Medicine

Dear Editor, Phenotypic drug discovery, which observes compound effects on physiology,has given way to targeting specific molecules, but has revived by using modern methods to find drugs based on therapeutic outcomes in disease models(Vincent et al., 2022). Osteoarthritis(OA) is a prevalent chronic joint disorder, primarily affecting knee joints, with osteoclast activation due to low-grade inflammation resulting in increased bone resorption and structural changes in the joint(Katz et al.,2021).

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Improving job satisfaction of Chinese nurses: the positive effects of structural empowerment and psychological capital

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TMR Integrative Nursing 2018年第4期2卷 169-177页

作者： Xin Dan Qiao-Mei Zhang jun-jie shi Su-Huan Xu Jing-Ying Liu Yan-Hui Liu Hong-Wen Ma School of Nursing Tianjin University of Traditional Chinese Medicine Tianjin China Chief Superintendent nurse TianjinUnion Medical Center Tianjin China

Objectives:This study examined the influence of Chinese nurses’personal resources(psychological capital)and access to workplace resources(structural empowerment)on their job ***:A cross-sectional study was designed during the period of January to April *** anonymous questionnaire containing demographic characteristics sheet,Minnesota Satisfaction Questionnaire,Conditions for Work Effectiveness Questionnaire-II and psychological capital(PsyCap)was issued to 480 registered nurses in Tianjin,China.A total of 462 respondents became our *** regression was performed to explore the factors associated with job ***:The average Minnesota Satisfaction Questionnaire score was 65.68±12.35 in our study *** regression analysis showed that structural empowerment(β=0.421,P<0.01),PsyCap(β=0.227,P<0.01) and educational level(β=0.061,P<0.05) were positively associated with job ***:The job satisfaction of Chinese nurses was at a moderate *** empowerment was the most crucial predictor of job satisfaction,followed by ***,nursing administrators should take measures such as building an authorized work environment and improving nurses’PsyCap in order to promote job satisfaction among Chinese nurses.

关键词： Empowerment Job satisfaction Nursing Psychological capital