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Multidimensional(0D-3D)functional nanocarbon:Promising material to strengthen the photocatalytic activity of graphitic carbon nitride

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Green Energy & Environment 2021年第6期6卷 823-845页

作者： bin he Mi Feng Xinyan Chen Jian Sun School of Life Science Beijing Institute of TechnologyBeijing100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China

As a prospective visible-light-responsive photochemical material,graphitic carbon nitride(g-C_(3)N_(4))has become a burgeoning research hot topics and aroused a wide interest as a metal-free semiconductor in the area of energy utilization and conversion,environmental protection due to its unique properties,such as facile synthesis,high physicochemical stability,excellent electronic band structure,and ***,the shortcomings of high recombination rate of charge carriers,relatively low electrical conductivity and visible light absorption impede its practical *** strategies,such as surface photosensitization,heteroatom deposition,semiconductor hybridization,etc.,have been applied to overcome the *** all the strategies,functional nanocarbon materials with various dimensions(0D~3D)attract much attention as modifiers of g-C_(3)N_(4)due to their unique electronic properties,optical properties,and easy *** importantly,the properties of these functional nanocarbon materials can be tuned by various dimensions and thus there will be a way to overcome the defects of g-C_(3)N_(4)by choosing different dimensional carbon *** from some present reviews,this review starts with the fundamental physicochemical characteristics of g-C_(3)N_(4)materials,followed by analyzing the advantages of functional nanocarbon materials modifying gC_(3)N_(4).Then,we present a systematic introduction to various dimensional carbon *** design philosophy of carbon/g-C_(3)N_(4)composites and the advanced studies are exemplified in ***,a nichetargeting summary and outlook on the major challenges,opportunities for future research in high-powered carbon/g-C_(3)N_(4)composites was proposed.

关键词： Graphitic carbon nitride(g-C_(3)N_(4)) Carbon materials Multidimension Photocatalysis Visible light

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Variation of meniscus shape and initial steel solidification under different steel-slag interfacial tension in continuous casting mold of slab

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Journal of Iron and Steel Research International 2023年第3期30卷 465-474页

作者： he-bin Jin Xue-you Wang Yun-bo Wang Shi-song Wang Xu-bin Zhang Sheng-ping he College of Materials Science and Engineering Chongqing Key Laboratory of Vanadium–Titanium Metallurgy and Advanced MaterialsChongqing UniversityChongqing 400044China Steelmaking Plant Qingdao Special Steel Co.Ltd.Qingdao 266400ShandongChina

A two-dimensional model was applied to investigate the influence of the interfacial tension between the steel and the slag on the behavior of the meniscus in continuous casting mold of *** shape of the meniscus and phenomena near the meniscus were revealed,and the profile of the slag rim and the depth of the solidified meniscus and oscillation marks with different interfacial tension of the steel and slag were *** the increase in the interfacial tension,the size of the curved meniscus increased,while the curvature and the height of the local meniscus close to the mold ***,the thickness of the slag rim,solid slag and total slag near the meniscus had the tendency to increase,and the bottom of the slag rim became lower and *** the increase in the interfacial tension from 0.1 to 2.5 N/m,the location of the largest heat flux near the meniscus decreased from 10.0 to 2.5 mm above the initial level of the steel,and the largest heat flux was within 3.52-4.58 MW/m^(2).Meanwhile,the largest depth of the solidified meniscus decreased from 3.3 to 2.3 mm,and the depth of oscillation marks decreased,which was conducive to the shallow hook at the subsurface of the slab,and the improvement of surface cleanliness of the slab.

关键词： Mathematical modeling Interfacial tension Meniscus behavior Initial solidification Continuous casting mold

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Research on GGT-responsive drug carrier with active transport effect

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Nano Research 2023年第5期16卷 7075-7084页

作者： Han Yan he Ma bin he bing Yu Youqing Shen Hailin Cong Institute of Biomedical Materials and Engineering College of Materials Science and EngineeringCollege of Chemistry and Chemical EngineeringQingdao UniversityQingdao 266071China State Key Laboratory of Bio-Fibers and Eco-Textiles Qingdao UniversityQingdao 266071China Key Laboratory of Biomass Chemical Engineering of Ministry of Education Center for BionanoengineeringDepartment of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China School of Materials Science and Engineering Shandong University of TechnologyZibo 255000China

Although a great quantity research has been done on cancer nano-drug carriers,how to deliver more cancer nano-drugs to tumor sites accurately and then endocytosis by cells is still a key problem in the process of cancer *** the concentration ofγ-glutamyl transpeptidase(GGT)in the microenvironment will be greatly increased when the liver,kidney,other organs become cancerous,we have designed a polymer nanomicelle as drug carrier that can respond to the GGT in the tumor *** the drug delivery system participates in blood circulation through the vascular wall cells to the tumor tissue,the overexpressed GGT on the surface of the cancer cells will recognize and cut theγ-glutamyl group on the carrier,the primary amines will be released to make the system with weak positive charge,which not only improves the carrier’s active transport ability for nanodrugs,but also improves the cell’s endocytosis ability for nano-drugs,so as to realize the release of nano-drugs in cancer ***’s more,the positive charge on the surface of the carrier also improves the permeability of the carrier in the tumor tissue,so that the cancer cells in the hypoxic area can also endocytosis drugs.

关键词： micelles enzyme response active transport endocytosis

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Fatigue Life Evaluation Method for Foundry Crane Metal Structure Considering Load Dynamic Response and Crack Closure Effect

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Computer Modeling in Engineering & Sciences 2020年第2期122卷 525-553页

作者： Qing Dong bin he Gening Xu School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuanChina.

To compensate for the shortcomings of quasi-static law in anti-fatigue analysis of foundry crane metal structures,the fatigue life evaluation method of foundry crane metal structure considering load dynamic response and crack closure effect is *** line with the theory of mechanical vibration,a dynamic model of crane structure during the working cycle is constructed,and dynamic coefficients under diverse actions are *** models of the internal force dynamic change process of dangerous cross-sections and a simulation model of first principal stress-time history are established by using the steel structure design criteria,which is utilised to extract the change of first principal stress of danger points over ***,the double-parameter stress spectrum is obtained by the rain flow counting *** fatigue life calculation formula is corrected by introducing a crack closure parameter that can be calculated by the stress ratio and the effective stress *** the finite element model imported into ***,crack propagation analysis is performed by the growth method in the fatigue integration module *** the metal structure of a 100/40t-28.5m foundry crane with track offset as an example,the accuracy of calculation results and the feasibility and applicability of the proposed method are verified by theoretical calculation and finite element simulation,which provide a theoretical basis for improvement of the fatigue resistance design of foundry cranes.

关键词： Metal structure of foundry crane load dynamic effect crack closure effect crack propagation fatigue life.

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Atomistic simulation of interactions of fracture with defect clusters in delta-Pu

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Science China(Physics,Mechanics & Astronomy) 2011年第10期54卷 1805-1810页

作者： LI RuSong he bin ZHANG QuanHu Xi'an Research Institute of High Technology Xi' an 710025 China

The Pu-he pair potential fitted by ab initio data, and the Pu-Pu and he-he modified embedded atom method (MEAM) poten-tials have been implemented to perform multi-scale simulations for the interactions of fracture with the self-interstitial atom(SIA), he interstitial atom and he-vacancy clusters. The simulation results indicate that Pu atoms around the fracture agglom-erate into an elliptic self-interstitial loop. Interstitial he atoms evolve into separate interstitial atoms, small he atom clustersand some substitutional he atoms. The he-vacancy cluster forms a spheric structure with a 1:1 he-to-vacancy ratio. Finally,the existence of self-interstitial atoms will lead to the local change of Pu lattice and an increasing disorder, and the wholesimulation cell shows a melting state at about 10.0 ps.

关键词： ab initio modified embedded atom method molecular dynamics interstitial atom

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Vibro-acoustic Radiation Characteristics Analysis of Railway Vehicle Wheel with Damping Ridges Based on Modal Strain Energy

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Chinese Journal of Mechanical Engineering 2011年第6期24卷 1056-1067页

作者： he bin XIAO Xinbiao JIN Xuesong FANG Jianying State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu 610031 China Knorr-Bremse Systems for Rail Vehicles（Suzhou） Co. Ltd Suzhou 215151 China

The existing researches on the damping wheel mainly focus on investigating the influence of damping structure change on the vibro-acoustic *** changes include the geometric size of the damping structure,the damping material parameters,and the placement,and so *** order to further understand the mechanism in reducing the acoustic radiation of railway wheel with layer damping treatment,in this paper,the wheel is simply modified by a full-sized circular *** circle plate side has stuck circumference constrained damping ridges and radial constrained damping ridges on *** on a hybrid finite element method-boundary element method（FEM-BEM）,the paper develops a vibro-acoustic radiation model for such a distributed constrained damping *** vibration and acoustic radiation of the circular plate is *** the analysis,the dynamic response of the system is obtained by using the 3D finite model superposition *** obtained vibration response is used as the initial boundary condition in solving helmholtz boundary integral equation for the sound radiation *** the procedure,firstly,the modal analysis of the circular plate is performed to get the distribution of the system modal strain ***,the vibro-acoustic radiation characteristics of the plate with different kinds of circumference damping ridges and radial damping ridges are compared in order to try to find the best effective damping ridge ***,using the distribution of the plate modal strain energy investigates the effect of the ridge distribution locations on the circular plate on its vibro-acoustic *** calculation and analysis research results show that,the sticking circumference and radial damping ridges on the plate can control the vibro-acoustic radiation of the plate effectively in different frequency *** distribution of the constrained damping ridge has an effect on reduction in vibro-acoustic radiation of the circular *** presen

关键词： wheel/rail noise vibro-acoustic radiation circumference damping ridge radial damping ridge modal strain energy

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Temperature Dependence of Ultrasonic Longitudinal Guided Wave Propagation in Long Range Steel Strands

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Chinese Journal of Mechanical Engineering 2011年第3期24卷 487-494页

作者： LIU Zenghua ZHAO Jichen WU bin he Cunfu College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology Beijing 100124 China

Ultrasonic guided wave inspection is an effective non-destructive testing method which can be used for stress level evaluation in steel *** the propagation velocity of ultrasonic guided waves changes due to temperature shift making the prestress measurement of steel strands inaccurate and even sometimes *** the course of solving the problem,this paper reports on quantitative research on the temperature dependence of ultrasonic longitudinal guided wave propagation in long range steel *** order to achieve the generation and reception of a chosen longitudinal mode in a steel strand with a helical shaped surface,a new type of magnetostrictive transducer was developed,characterized by a group of thin clips and three identical permanent *** and reception of ultrasonic guided waves in a steel strand were performed *** results shows that in the temperature range from-4 ℃ to 34 ℃,the propagation velocity of the L（0,1） mode at 160 kHz linearly decreased with increasing temperature and its temperature dependent coefficient was 0.90（m·s-1 ·（℃）-1） which is very close to the theoretical *** effect of dimension deviation between the helical and center wires and the effect of the thermal expansion of the steel strand on ultrasonic longitudinal guided wave propagation were also *** was found that these effects could be ignored compared with the change in the material mechanical properties of the steel strands due to temperature *** was also observed that the longitudinal guided wave mode was somewhat more sensitive to temperature changes compared with conventional ultrasonic waves ***,it is considered that the temperature effect on ultrasonic longitudinal guided wave propagation in order to improve the accuracy of stress measurement in prestressed steel *** research on the temperature dependence of ultrasonic guided wave propagation in steel strands

关键词： steel strand ultrasonic guided waves mode temperature coefficient magnetostrictive transducer

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Analysis and control of inter-electrode gap during leveling process in counter-rotating electrochemical machining

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Chinese Journal of Aeronautics 2019年第11期32卷 2557-2565页

作者： Dengyong WANG Jinzheng LI bin he Di ZHU College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing 210016China

The inter-electrode gap(IEG) is an essential parameter for the anode shaping process in electrochemical machining(ECM) and directly affects the machining accuracy. In this paper, the IEG during the leveling process of an oval anode workpiece in counter-rotating ECM(CRECM)is investigated. The variation of the minimum IEG is analyzed theoretically, and the results indicate that rather than reaching equilibrium, the minimum IEG in CRECM expands constantly when a constant feed speed is used for the cathode tool. This IEG expansion leads to a poor localization effect and has an adverse influence on the roundness of the machined workpiece. To maintain a small constant IEG in CRECM, a variable feed speed is used for the cathode based on a fitted equation. The theoretical results show that the minimum IEG can be controlled at a small value by using an accelerated feed speed. Experiments have been conducted using a specific experimental apparatus in which the cathode tool is designed as a combined structure of two sectors and a thin sheet. By detecting the machining currents flowing through the minimum IEG, how the latter varies is obtained indirectly. The results indicate that using an accelerated feed speed is effective for controlling the IEG, thereby improving the roundness of the machined workpiece.

关键词： Counter-rotating Electrochemical machining Inter-electrode gap Leveling process Variable feed speed

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Weakening sensitivity of global vegetation to long-term droughts

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Science China Earth Sciences 2018年第1期61卷 60-70页

作者： he bin HUANG Ling CheN ZiYue WANG HaiYan State Key Laboratory of Earth Surface Processes and Resource Ecology College of Global Change and Earth System Science Beijing Normal University College of Urban and Environmental Sciences Peking University

Droughts have dramatic direct and indirect impacts on vegetation and terrestrial ecosystem stability, including decreases in growth and subsequent decreases in CO_2 absorption. Although much research has been carried out on the response of vegetation to droughts, it remains unclear whether biomes are becoming more resistant or more vulnerable to drought. In this study, we used the Standardized Precipitation Evapotranspiration Index(SPEI, a multiscalar drought index) and the Normalized Difference Vegetation Index(NDVI, an indicator of vegetation growth) to detect the sensitivity of vegetation growth to droughts across 12–24 month timescales and to detect the change in this sensitivity over recent decades. We found that vegetation growth was most sensitive to 17–18 month droughts in water-limited regions, implying pronounce legacy effects from water conditions in previous years. In addition, we detected reduced coupling between drought and vegetation growth, probably caused by release moisture stress in water limited areas. Meanwhile, we observed a shortening of drought timescale to which vegetation most sensitively responded from an average of 18.1 to 17.2 months, suggesting the weakening of the drought legacy effect on vegetation growth. Results of this study contribute to the overall understanding of the resistance and resilience of ecosystems to drought conditions.

关键词： Drought Vegetation growth Response Sensitivity Legacy effect NDVI SPEI

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Speciation of organomercury compounds by capillary electrophoresis with pre-column derivatization and on-line stacking

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Chinese Chemical Letters 2019年第3期30卷 650-652页

作者： Dandan Cao Yongguang Yin bin he State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of Sciences

Simultaneous separation and detection of three organomercury species, namely methylmercury(MeHg),ethylmercury(EtHg), and phenylmercury(PhHg), was performed by using capillary electrophoresis(CE)with UV detection. Pre-column derivatization with thiosalicylic acid and on-line salt-induced stacking significantly improved the detection performance. Buffer pH, ion strength, and additive were optimized for CE separation, concentration of NaCl in sample solution and injection time were optimized for on-line stacking. The limits of detection were 76.9,83.0 and 76.4 μg/L for PhHg, EtHg and MeHg, respectively. The developed method was validated by certified reference material and liquid chromatography-atomic fluorescence spectroscopy, which suggests this method could be useful in the speciation of organomercury compounds in biological samples.

关键词： Capillary electrophoresis Mercury speciation Derivatization On-line stacking

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