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Functionalization of covalent organic frameworks via multicomponent reactions

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Science China Chemistry 2024年第12期67卷 3906-3914页

作者： Xue-Hui Liu Peng-Lai wang Wei wang san-Yuan Ding State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringMOE Frontiers Science Center for Rare IsotopesLanzhou UniversityLanzhou 730000China

Functionalized covalent organic frameworks(COFs)represent a fascinating class of porous materials that have attracted widespread interest due to their modifiable structures and impressive potential ***,the construction of functionalized COFs remains difficult as it requires simultaneous consideration of robust linkages,diversified structures,and tailorable ***,the introduction of multicomponent reactions(MCRs)into COF synthesis opens new avenues for creating highly stable and function-oriented COF materials,marking a significant advance in the development of *** minireview summarizes the types of MCRs used in COF synthesis,highlights the functionalization strategies of COFs via MCRs,and provides insights on the key challenges and future frontiers in this field.

关键词： covalent organic frameworks multicomponent reactions functionalization strategies

A review of the thermal stability of metastable austenite in steels:Martensite formation

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Journal of Materials Science & Technology 2021年第32期91卷 200-214页

作者： Yong Li David san Martín Jinliang wang Chenchong wang Wei Xu State key laboratory of rolling and automation Northeastern UniversityShenyang 110819China Materalia Research Group Centro Nacional de Investigaciones Metalúrgicas(CENIM-CSIC)Avda Gregorio del Amo 8Madrid E-28040Spain School of Mechanical and Power Engineering Guangdong Ocean UniversityZhanjiang 524088China

Metastable austenite plays a critical role in achieving improved combinations of high strength and high ductility/toughness in the design of advanced high-strength steels(AHSS). The thermal stability of metastable austenite determines the transformation characteristics of AHSS and thus primarily determines the microstructure evolution during complex processes, e.g., the quenching and partitioning process, to achieve the desirable microstructure. This study provides a review of the thermal stability of austenite and its influence on martensitic transformation from both experimental and theoretical modeling perspectives. From the experimental perspective, factors affecting the thermal stability are analyzed,the relative sensitivities are compared, and their corresponding mechanisms are discussed. From the theoretical modeling perspective, the most representative kinetic models that describe athermal and isothermal martensitic transformation are reviewed. The advantages, shortcomings, and applicability of each model are discussed. The systematic review of both experimental and theoretical aspects reveals critical factors in tailoring the stability of metastable austenite and, therefore, provides guidance for the design of advanced steels.

关键词： Austenite Thermal stability Martensitic transformation Kinetic models

Sub-pixel high precision dimensional measurement method for aero-engine hollow turbine blade based on industrial computed tomography image

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China Foundry 2022年第4期19卷 307-320页

作者： Ya-nan wang san-san shuai Xing-fu Ren Tong-tong Hu Jiang wang Zhong-ming Ren State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

Aero-engine hollow turbine blades are work under prolonged high temperature,requiring high dimensional *** profile and wall thickness are important parameters to ensure the comprehensive performance of blades,which need to be measured accurately during manufacturing *** this study,a high accuracy industrial computed tomography(ICT)measuring method was developed based on standard cylindrical pin and ring workpieces of different *** ICT with cubic spline interpolation,a sub-pixel accuracy was achieved in measuring the dimension of *** with the traditional and whole-pixel level image measurement method,the cubic spline interpolation algorithm has the advantages of high accuracy in image edge detection and thus high accuracy of dimensional ***,the technique was employed to measure the profile and wall thickness of a typical aerospace engine turbine blade,and an accuracy higher than 0.015 mm was obtained.

关键词： dimensional accuracy industrial computed tomography cubic spline interpolation sub-pixel accuracy

Abnormal Shift of Center Wavelength in Annealing Long-Period Gratings

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Chinese Physics Letters 2000年第1期17卷 28-30页

作者： QIN Li WEI Zhan-Xiong wang Qing-Ya LI Hui-Ping ZHANG Yu-shu GAO Ding-san Department of Electronics Engineering Jilin UniversityChangchun 130023

During annealing process of long-period gratings,the center wavelengths of some inodes shift to red wavelength while those of others shift to blue compared with their original written ones,and the magnitudes of the shifts are related to the decay of the grating *** red shifts of center wavelength are more evident in lower-order inodes of the *** suggest that part of the photodissociated-H2 combines continuously with Ge-defect centers within 2 h after UV-exposure,and with which the observed abnormal shifts can be explained successfully.

关键词： center Shift annealing

Exact Solutions of One-Dimensional N-Component Bariev Model with General Boundary Conditions

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Communications in Theoretical Physics 2006年第4X期46卷 755-760页

作者： KE san-Min wang Chun YUE Rui-Hong Institute of Modern Physics Northwest University Xi'an 710069 China College of Science Xi'an Shiyou University Xi'an 710065 China

The N-component Bariev model for correlated hopping with open boundary conditions in one dimension is studied in the framework of coordinate Bethe ansatz method. The energy spectrum, integrable boundary conditions and... 详细信息

关键词： coordinate Bethe ansatz open-boundary conditions N-component Bariev model

General Solutions of Reflection Equations for Bariev Model

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Communications in Theoretical Physics 2008年第1期49卷 159-165页

作者： wang Chun KE san-Min YUE Rui-Hong College of Science Xi＇an Shiyou University Xi＇an 710065 China Institute of Modern Physics Northwest University Xi＇an 710069 China

The integrable general open-boundary conditions for the one-dimensional Bariev chain are considered. All kinds of solutions to the reflection equation （RE） and its dual are obtained.

关键词： Bariev model reflection equation non-diagonal solution

Effect of Intrinsic Decoherence of Milburn's Model on Entanglement of Two-Qutrit States

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Communications in Theoretical Physics 2008年第2期49卷 516-520页

作者： QIU Liang wang An-Min MA Xiao-san Department of Modern Physics University of Science and Technology of China Hefei 230026. China

We model of intrinsic analyze the time evolution of entanglement of two-qutrit system within the framework of Milburn＇s decoherence. The entanglement evolution relies not only on the parameters of system, but also on the concrete states either pure or mixed. The linear entropy used to measure the extent to which the intrinsic decoherenee affects quantum states is evaluated.

关键词： intrinsic decoherence Milburn's model time evolution of entanglement

A global perspective on the ethnic-specific BRCA variation and its implication in clinical application

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Journal of the National Cancer Center 2023年第1期3卷 14-20页

作者： san Ming wang Ministry of Education Frontiers Science Center for Precision Oncology Cancer Center and Institute of Translational MedicineDepartment of Public Health and Medical AdministrationFaculty of Health SciencesUniversity of MacaoMacao SARChina

Pathogenic BRCA1 and BRCA2(BRCA)variation is the genetic predisposition for high cancer risk affecting mostly breast and *** variation information is widely used in clinical diagnosis,treatment,and prevention of BRCA-related *** positive selection imposed on human BRCA leads to highly ethnic-specific BRCA variation to adapt different living environment on *** of the human BRCA variants identified so far were from the European descendant populations and used as the standard reference for global human populations,whereas BRCA variation in other ethnic populations remains poorly *** review addresses the origin of ethnic-specific BRCA variation,the importance of ethnic-specific BRCA variation in clinical application,the limitation of current BRCA variation data,and potential solutions to fill the gap.

关键词： BRCA variation Pathogenic Ethnicity Cancer Population Evolution

Free cupric ions in contaminated agricultural soils around a copper mine in eastern Nanjing City, China

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Journal of Environmental Sciences 2006年第5期18卷 927-931页

作者： LUO Xiao-san ZHOU Dong-mei wang Yu-jun State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China

To determine the environmental free metal ion activity was a recent hot issue. A method to measure low-level free cupric ion activity in soil solution extracted with 0.01 mol/L KNO3 was developed by using cupric ion-selective electrode （ISE） and calibrating with Cu-buffer solution. Three copper buffers including iminodiacetic acid （IDA）, ethylenediamine （EN）, and glycine （Gly） were compared for calibrating the Cu-ISE curves in the range of free cupric ions （pCu^2＋） 7-13. The Cu-EN buffer showed the best electrode response and thus was applied as the calibration buffer. The pCu^2＋ of 39 contaminated agricultural soils around a copper mine was measured, ranging from 5.03 to 9.20. Most Cu in the soil solutions was found to be complexed with dissolved soil organic matters, averaging 98.1%. The proportion of free Cu^2＋ ions in the soil solutions decreased with the increasing of solution pH. Soluble Cu and free Cu^2＋ ions concentrations were analyzed by multiple linear regressions to evaluate the effects of soil properties on metal levels and speciation. The results showed that soil solution pH was the most significant factor influencing pCu^2＋（with R^2 value of 0.76）, while not important for the soluble Cu concentration.

关键词： copper ion selective electrode (Cu-ISE) free metal ion activity soil solution metal speciation bioavailability