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Journal of Magnesium and Alloys 2023年第4期11卷 1367-1380页

作者： Shiquan Jiang Zhiyuan Zhang Dong Wang Yuqing Wen Ning Peng wei shang Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials College of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004China

Mg alloys are considered the most promising engineering materials because of their unique ***,the uncontrolled corrosion rate of these alloys limits their ***,in this study,a micro-arc oxidation layer was used as a transition layer to“directly”grow a zinc-based metal-organic framework(MOF)composite coating on the surface of a Mg alloy(AZ91D).Herein,the two zeolitic imidazolate framework(ZIF-8)coatings with different morphologies were separately prepared by homologous metal oxide induction and a one-step in-situ growth *** superhydrophobic composite coating showed strong hydrophobicity and self-cleaning properties,which could prevent the penetration of water and corrosive ions(Cl^(−))into the surface of *** tests demonstrated that the super-hydrophobic composite coatings greatly enhanced the corrosion resistance of AZ91D,and the corrosion current density decreased from 10^(−5)to 10^(−9)A/cm^(2).These results indicate that the ZIF-8 coatings are beneficial for improving the hydrophobicity and enhancing the corrosion resistance of Mg ***,MOF composite coatings provide a new strategy that can be used to prepare multifunctional anticorrosion coatings on metal substrates.

关键词： Mg alloy Composite coating Metal-organic framework Corrosion resistance Superhydrophobicity

Microstructure and mechanical properties of Al-B4C composite at elevated temperature strengthened with in situ Al2O3 network

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Rare Metals 2020年第6期39卷 671-679页

作者： shang-Yang Feng Qiu-Lin Li wei Liu Guo-Gang Shu Xin Wang Graduate School at Shenzhen Tsinghua UniversityShenzhen 518055China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Sate Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment China Nuclear Power Engineering Co.Ltd.Shenzhen 518172China China Nuclear Powder Design Co. Ltd.Shenzhen 518057China

This study evaluated the mechanical properties and thermal properties of Al-12 vol%B4 C composite at elevated temperature strengthened with in situ Al2 O3 *** composite was fabricated using powder metallurgy(PM)with raw materials of fine atomized aluminum powders,and the associated microstructures were *** 350℃,the composite had ultimate tensile strength of UTS=137 MPa,yield strength of YS0.2=118 MPa,and elongation ofε=4%.Besides,the mechanical properties of the composite remained unchanged at 350℃after the long holding periods up to 1000 *** excellent mechanical properties and thermal stability at 350℃were secured by in situ am-Al2O3 network that strengthened the grain *** interfacial debonding and brittle cracking of B4 C particles were the main fracture mechanisms of the *** addition,the influence of sintering temperature and rolling deformation on the microstructures and mechanical properties was studied.

关键词： Al-B4C Alumina(Al2O3) Composite Mechanical properties Microstructure

Comparative study of raw and HNO_(3)-modified porous carbon from waste printed circuit boards for sulfadiazine adsorption: Experiment and DFT study

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Chinese Chemical Letters 2023年第7期34卷 256-259页

作者： Yujiao Kan Ruxin Zhang Xing Xu Bo wei Yanan shang School of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Faculty of Light Industry Qilu University of Technology(Shandong Academy of Sciences)Ji'nan 250353China Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao 266237China Environment Research Institute ShandongUniversityQingdao266237China

A huge amount of waste printed circuit boards(WPCBs) was produced while the electronic manufacturing industry developed rapidly. WPCBs mainly consist of organic compounds, which makes it possible to prepare them into porous carbon as valuable adsorbent. However, WPCBs are also rich in valuable *** makes up the most of these metals. It is worth studying whether the residual metal will affect the application of carbon materials. In this study, the porous active carbon(AC) was prepared from WPCBs as an adsorbent. Sulfadiazine(SD), a widely detected antibiotic contaminant, was used as a target *** acid(HNO_(3)) was used to modify AC(AC-HNO_(3)) to remove the residual Cu. The experiment results showed that the adsorption kinetics of SD by AC(k = 0.0025) and AC-HNO_(3)(k = 0.0029) can be described better using a pseudo-second-order kinetic equation. The adsorption isotherms of AC and AC-HNO_(3) on SD could be fitted by the Langmuir model. AC had a larger adsorption capacity than AC-HNO_(3). Density functional theory(DFT) calculation results suggested that the-OH group and Cu on the surface of AC could be the adsorption sites and promote the SD adsorption. This work provides practical methods to recycle WPCBs into wealth and realized waste control by waste.

关键词： WPCBs DFT Sulfadiazine Porous carbon

Application of germ-free NOD-scid IL2rg^(null)mice as a humanized model for tumor microbiome precision medicine

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Science China(Life Sciences) 2021年第4期64卷 644-647页

作者： Chengwei Wu Haitao shang Xianhong Jiang Xinning Wang Hong wei Precision Medicine Instiute The First Afiliated HospitalSun Ya-sen UniversityGuangzhou 510080China College of Animal Sciences and Technology Slate Key Laboratory of Agricultural MicrobiologyHuazhong Agriculnural UniversityWuhan 430070China

In 2013,tumor immunotherapy topped the list of the top ten scientific breakthroughs(Couzin-Frankel,2013),and it was widely used in the treatment of lung cancer,kidney cancer,and melanoma(Routy et al.,2018).However,the response rate of patients to tumor immunotherapy varies,and usually,only a small percentage of patients respond well to treatment(Sambi et al.,2019).

关键词： al. lung cancer

Towards Long Lifetime Battery:AI-Based Manufacturing and Management

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IEEE/CAA Journal of Automatica Sinica 2022年第7期9卷 1139-1165页

作者： Kailong Liu Zhongbao wei Chenghui Zhang Yunlong shang Remus Teodorescu Qing-Long Han Warwick Manufacturing Group University of WarwickCoventry CV47ALUnited Kingdom National Engineering Laboratory for Electric Vehicles School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China School of Control Science and Engineering Shandong UniversityJinan 250061China Department of Energy Technology Aalborg UniversityAalborg 9220Denmark School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyMelbourneVIC 3122Australia IEEE

Technologies that accelerate the delivery of reliable battery-based energy storage will not only contribute to decarbonization such as transportation electrification,smart grid,but also strengthen the battery supply *** battery inevitably ages with time,losing its capacity to store charge and deliver it *** directly affects battery safety and efficiency,making related health management *** advancements in automation science and engineering raised interest in AI-based solutions to prolong battery lifetime from both manufacturing and management *** paper aims at presenting a critical review of the state-of-the-art AI-based manufacturing and management strategies towards long lifetime ***,AI-based battery manufacturing and smart battery to benefit battery health are *** the most adopted AI solutions for battery life diagnostic including state-of-health estimation and ageing prediction are reviewed with a discussion of their advantages and *** through designing suitable AI solutions to enhance battery longevity are also ***,the main challenges involved and potential strategies in this field are *** work will inform insights into the feasible,advanced AI for the health-conscious manufacturing,control and optimization of battery on different technology readiness levels.

关键词： Artificial intelligence battery health management battery life diagnostic battery manufacturing smart battery

In-situ measurement via the flow-through method and numerical simulations for radon exhalation during measurements of the radon exhalation rate

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Nuclear Science and Techniques 2024年第7期35卷 192-207页

作者： Ming Xia Yong-Jun Ye Shan-wei shang Ting Yu Dai-Jia Chen School of Resources Environment and Safety Engineering University of South ChinaHengyang421001China Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy University of South ChinaHengyang421001China

Small-scale measurements of the radon exhalation rate using the flow-through and closed-loop methods were conducted on the surface of a uranium tailing pond to better understand the differences between the two *** abnormal radon exhalation behavior was observed,leading to computational fluid dynamics(CFD)-based simulations in which dynamic radon migration in a porous medium and accumulation chamber was *** on the in-situ experimental and numerical simulation results,variations in the radon exhalation rate subject to permeability,flow rate,and insertion depth were quantified and *** in-situ radon exhalation rates measured using the flow-through method were higher than those measured using the closed-loop method,which could be explained by the negative pressure difference between the inside and outside of the chamber during the *** consistency of the variations in the radon exhalation rate between the experiments and simulations suggests the reliability of CFD-based techniques in obtaining the dynamic evolution of transient radon exhalation rates for diffusion and convection at the porous medium-air *** synergistic effects of the three factors(insertion depth,flow rate,and permeability)on the negative pressure difference and measured exhalation rate were quantified,and multivariate regression models were established,with positive correlations in most cases;the exhalation rate decreased with increasing insertion depth at a permeability of 1×10^(−11) m^(2).CFD-based simulations can provide theoretical guidance for improving the flow-through method and thus achieve accurate measurements.

关键词： Radon exhalation Flow-through Numerical simulation Accumulation chamber Multivariate regression

A Solution to Two Paradoxes of International Capital Flows

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Economic and Political Studies 2014年第1期2卷 3-43页

作者： JIANDONG JU shang-JIN wei the Center for International Economic Research (CIER) at Tsinghua University and University of Oklahoma the Columbia Business School Center for Economic Policy Research (CEPR)CIERand National Bureau of Economic Research (NBER)

International capital flows from rich to poor countries can be regarded as either too small(the Lucas paradox in a one-sector model)or too large(when compared with the logic of factor price equalization in a two-sector model).To resolve the paradoxes,we introduce a non-neoclassical model which features financial contracts and firm *** our model,free trade in goods does not imply equal returns to capital across *** addition,rich patterns of gross capital flows emerge as a function of financial and property rights institutions.A poor country with an inefficient financial system may simultaneously experience an outflow of financial capital but an inflow of FDI,resulting in a small net *** comparison,a country with a low capital-to-labor ratio but a high risk of expropriation may experience an outflow of financial capital without a compensating inflow of FDI.

关键词： capital bypass circulation expropriation risk gross capital flow heterogeneous entrepreneurs financial development

The Competitive Saving Motive： Concept, Evidence, and Implications

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Frontiers of Economics in China-Selected Publications from Chinese Universities 2016年第3期11卷 355-366页

作者： shang-Jin wei Xiaobo Zhang Economic Research and Regional Cooperation Department Asian Development Bank Mandaluyong City 1550 Metro Manila Philippines National School of Development Peking University Beijing 100871 China

This short essay surveys recent literature on the competitive saving motive and its broader economic implications. The competitive saving motive is defined as saving to improve one＇s status relative to other competitors for dating and marriage partners. Here are some of the key results of the recent literature：（i） cross-country evidence show that greater gender imbalances tend to correspond with higher savings rates; （ii） household-level evidence suggest that：（a） families with unmarried sons in rural regions with more skewed sex ratios tend to have higher savings rates, while savings rates of families with unmarried daughters appear uncorrelated with gender imbalances; and （b） savings rates of families in cities tend to rise with the local sex ratio; （iii） rising sex ratios contribute nearly half of the rise in housing prices in the People＇s Republic of China; and （iv） families with sons in regions of greater sex ratios are more likely to become entrepreneurs and take risky jobs to earn more income.

关键词： marriage market competition current account saving sex ratio

Effects of vertical electric field and compressive strain on electronic properties of bilayer ZrS2

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Journal of Semiconductors 2017年第3期38卷 59-62页

作者： Jimin shang Le Huang Zhongming wei Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China

Using first-principles calculations,including Grimme D2 method for van der Waals interactions,we investigate the tuning electronic properties of bilayer zirconium disulfides（ZrS_2/ subjected to vertical electric field and normal compressive *** band gap of ZrS_2 bilayer can be flexibly tuned by vertical external electric *** to the Stark effect,at critical electric fields about 1.4 V/？,semiconducting-metallic transition *** addition,our results also demonstrated that the compressive strain has an important impact on the electronic properties of ZrS_2 bilayer *** widely tunable band gaps confirm possibilities for its applications in electronics and optoelectronics.

关键词： vertical electric field normal compressive strain electronic properties zirconium disulfides bilayer

Undersea Buried Pipeline Reconstruction Based on the Level Set and Inverse Multiquadric Regularization Method

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Journal of Ocean University of China 2022年第1期21卷 101-112页

作者： shang Wenjing XUE wei XU Yidong MAKAROV Sergey B LI Yingsong College of Information and Communication Engineering Harbin Engineering UniversityHarbin 150001China Key Laboratory of Advanced Marine Communication and Information Technology Ministry of Industry and Information TechnologyHarbin 150001China Yantai Research Institute and Graduate School of Harbin Engineering University Yantai 264006China Institute of Physics Nanotechnology and TelecommunicationsHigher School of Applied Physics and Space TechnologiesPeter the Great St.Petersburg Polytechnic UniversitySt.Petersburg 195251Russia

The electric inversion technique reconstructs the subsurface medium distribution from acquired *** the basis of electric inversion,objects buried under the earth or seabed,such as pipelines and unexploded ordnance,are detected and located in a contactless ***,the process of accurately reconstructing the shape of the target object is challenging because electric inversion is a nonlinear and ill-posed *** this work,we present an inverse multiquadric(IMQ)regularization method based on the level set function for reconstructing buried *** the case of locating underwater objects,the unknown inversion area is split into two parts,the background and the pipeline with known *** geometry of the pipeline is represented based on the level set function for achieving a noiseless inversion *** obtain a binary image,the IMQ is used as the regularization term,which‘pushes’the level set function away from *** also provide an appropriate method to select the bandwidth and regularization parameters for the IMQ regularization term,resulting in reconstructed images with sharp *** simulation results and analysis show that the proposed method performs better than classical inversion methods.

关键词： inverse problems level set function inverse multiquadric regularization method buried pipeline