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Enhancing the anti-corrosion performance and biocompatibility of AZ91D Mg alloy by applying roughness pretreatment and coating with in-situ Mg(OH)_(2)/Mg-Al LDH

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Journal of Magnesium and Alloys 2024年第6期12卷 2520-2533页

作者： Zexi Shao Pubo Li Chao Zhang Bintao Wu chan tang Mangmang Gao School of Materials and New Energy Ningxia Key Laboratory of Photovoltaic MaterialsNingxia UniversityYinchuan750021PR China Department of Gastroenterology The Third Xiangya HospitalCentral South UniversityChangsha410000PR China

Corrosion-resistant and biocompatible films were fabricated on AZ91D Mg alloy substrates by varying their roughness levels using met-allographic preparation and subsequent hydrothermal *** coated films comprised a mixed structure of Mg(OH)_(2)and Mg-Al layered double hydroxides(LDH)and exhibited excellent *** film thickness increased with decreasing surface *** resistance was evaluated using potentiodynamic polarization and electrochemical impedance *** pretreat-ment influenced the chemical activity of the Mg alloy surface and helped modulate the dissolution rate of the Mg_(17)Al_(12)phase during the hydrothermal *** decreasing roughness of the Mg substrate,the Al^(3+)concentration gradually increased,accelerating the in-situ formation of the Mg(OH)_(2)/LDH composite coating and improving its crystallinity.A thick and dense Mg(OH)_(2)/LDH coating was synthesized on the Mg substrate with the least roughness,substantially improving the corrosion resistance of the AZ91D *** lowest corrosion current density((5.73±2.75)×10^(−8)A·cm^(−2))was achieved,which was approximately three orders of magnitude less than that of bare ***,the coating demonstrated biocompatibility with no evident cytotoxicity,cellular damage,and hemolytic *** study provides an effective method for preparing coatings on Mg alloy surfaces with excellent corrosion resistance and biocompatibility.

关键词： Magnesium alloy Roughness Corrosion resistance Layered double hydroxides Biocompatibility

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Variations in chlorophyll content, stomatal conductance, and photosynthesis in Setaria EMS mutants

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Journal of Integrative Agriculture 2023年第6期22卷 1618-1630页

作者： tang chan-juan LUO Ming-zhao ZHANG Shuo JIA Guan-qing tang Sha JIA Yan-chao ZHI Hui DIAO Xian-min Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081P.R.China

Chlorophyll (Chl) content,especially Chl b content,and stomatal conductance (G_s) are the key factors affecting the net photosynthetic rate (P_n).Setaria italica,a diploid C_4 panicoid species with a simple genome and high transformation efficiency,has been widely accepted as a model in photosynthesis and drought-tolerance *** current study characterized Chl content,G_s,and P_n of 48 Setaria mutants induced by ethyl methanesulfonate.A total of 24,34,and 35 mutants had significant variations in Chl content,G_s,and P_n,*** analysis showed a positive correlation between increased G_s and increased P_n,and a weak correlation between decreased Chl b content and decreased P_n was also ***,two mutants behaved with significantly decreased Chl b content but increased P_n compared to Yugu *** mutants behaved with significantly decreased G_s but did not decrease P_(n )compared to Yugu *** current study thus identified various genetic lines,further exploration of which would be beneficial to elucidate the relationship between Chl content,G_s,and P_n and the mechanism underlying why C_4 species are efficient at photosynthesis and water saving.

关键词： photosynthetic capacity chlorophyll content stomatal conductance EMS mutant variation Setaria italica

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Magnetically controllable multimode interference in topological photonic crystals

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Light(Science & Applications) 2024年第5期13卷 998-1005页

作者： Weiyuan tang Mudi Wang Shaojie Ma Che Ting chan Shuang Zhang New Cornerstone Science Laboratory Department of PhysicsThe University of Hong KongHong KongChina. Department of Physics The Hong Kong University of Science and TechnologyHong KongChina. Department of Optical Science and Engineering Fudan UniversityShanghai 200433China

Topological photonic insulators show promise for applications in compact integrated photonic circuits due to their ability to transport light robustly through sharp *** number of topological edge states relies on the difference between the bulk Chern numbers across the boundary,as dictated by the bulk edge *** interference among multiple topological edge modes in topological photonics systems may allow for controllable functionalities that are particularly desirable for constructing reconfigurable photonic *** this work,we demonstrate magnetically controllable multimode interference based on gyromagnetic topological photonic insulators that support two unidirectional edge modes with different *** successfully achieve controllable power splitting in experiments by engineering multimode interference with the magnetic field intensity or the frequency of *** work demonstrates that manipulating the interference among multiple chiral edge modes can facilitate the advancement of highly efficient and adaptable microwave devices.

关键词： multimode controllable microwave

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AlGaN/GaN HEMTs on 4-Inch Silicon Substrates in the Presence of 2.7-μm -Thick Epilayers with the Maximum Off-State Breakdown Voltage of 500 V

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Chinese Physics Letters 2014年第3期31卷 129-132页

作者： YU Xin-Xin NI Jin-Yu LI Zhong-Hui KONG Cen ZHOU Jian-Jun DONG Xun PAN Lei KONG Yue-chan CHEN tang-Sheng Science and Technology on Monolithic Integrated Circuits and Modules Laboratory Nanjing Electronic Devices Institute Nanjing 210016

We report on the high breakdown performance of AlGaN/GaN high electron mobility transistors （HEMTs） grown on 4-inch silicon substrates. The HEMT structure including three Al-content step-graded AlGaN transition layers has a total thickness of 2.7 μm. The HEMT with a gate width WG of 300 μm acquires a maximum off-state breakdown voltage （BV） of 550 V and a maximum drain current of 527 mA/mm at a gate voltage of 2 V. It is found that BV is improved with the increase of gate-drain distance LGD until it exceeds 8 μm and then BV is tended to saturation. While the maximum drain current drops continuously with the increase of LGD. The HEMT with a WG of 3 mm and a LGD of 8 μm obtains an off-state BV of 500 V. Its maximum leakage current is just 13 μA when the drain voltage is below 400 V. The device exhibits a maximum output current of 1 A with a maximum transconductance of 242 mS.

关键词： HIGH electron mobility transistors RESEARCH SILICON -- Research GALLIUM nitride SEMICONDUCTOR doping PHYSICS research

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Multifunctional MXene/rGO aerogels loaded with Co/MnO nanocomposites for enhanced electromagnetic wave absorption,thermal insulation and pressure sensing

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Nano Research 2024年第9期17卷 7803-7813页

作者： chan Guo Shiping Shao Xin Zhang Yunxiang tang Luxue Wang Jiurong Liu Lili Wu Ke Bi Fenglong Wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong UniversityJinan 250061China State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China

Aerogel-based composites hold promising application prospects as potential electromagnetic wave(EMW)absorption materials,yet the construction of such materials with ingenious microstructures,appropriate magnetic/dielectric multi-components,and integrated multifunctionality remains considerably ***,a multicomponent Co/MnO/Ti_(3)C_(2)T_(x) MXene/rGO(CMMG)hybrid aerogel featured with three-dimensional(3D)vertical directional channel architecture is *** from the synergistic effect arising from the 3D conductive networking structure,diverse heterogeneous interfaces,magnetic/dielectric multicomponent,and multiple loss pathways,the optimized CMMG-2 aerogel delivers fascinating EMW absorption capabilities,characterized by a minimal reflection loss(RL_(min))of-77.41 dB and an effective absorption bandwidth(EAB)of 6.56 ***,the remarkable hydrophobicity,exceptional thermal insulation capabilities,and outstanding photothermal properties of CMMG-2 aerogel make it highly promising for multiple application in diverse and demanding ***,the distinctive pore structure of hybrid aerogel also allows it for sensitive and reliable detection of electrical signals caused by pressure changes and human ***,this research provides a viable design strategy for the development of lightweight,efficient,and multifunctional aerogel-based EMW absorption materials for various application scenarios.

关键词： electromagnetic wave absorption Ti_(3)C_(2)qT_(x)MXene reduced graphene oxide magnetic-dielectric nanoparticles multifunctional aerogel

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发散孔纵向波纹隔热屏气膜冷却特性

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航空动力学报 2009年第1期24卷 18-24页

作者：唐婵常海萍南京工程学院能源与动力工程学院南京211167 南京航空航天大学能源与动力学院南京210016

对燃烧室内开有发散孔的纵向波纹隔热屏进行了数值模拟.研究隔热屏的四种结构参数开孔率、波纹板高度、孔径和冷却通道高度的改变对隔热屏冷却效果的影响.研究表明:在气膜孔出流总量相同的情况下,3%开孔率比6%开孔率的隔热屏平均冷却效... 详细信息

对燃烧室内开有发散孔的纵向波纹隔热屏进行了数值模拟.研究隔热屏的四种结构参数开孔率、波纹板高度、孔径和冷却通道高度的改变对隔热屏冷却效果的影响.研究表明:在气膜孔出流总量相同的情况下,3%开孔率比6%开孔率的隔热屏平均冷却效率较高;波纹板高度对隔热屏冷却效果影响较大,波纹板无量纲高度为1%比波纹板无量纲高度为2%和3.33%的隔热屏平均冷却效率高;孔径和冷却通道高度的改变对隔热屏冷却效果几乎没有影响.

关键词：波纹隔热屏冷却效率气膜冷却数值模拟发散孔

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Analysis of chamber effect on intermittent pulsation

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Journal of Central South University 2016年第12期23卷 3332-3345页

作者：唐婵张靖周谭晓茗王春华 College of Energy and Power Engineering Jiangsu Province Key Laboratory of Aerospace Power System Nanjing University of Aeronautics and Astronautics Nanjing 210016 China College of Energy and Power Engineering Nanjing Institute of Technology Nanjing 211167 China Collaborative Innovation Center of Advanced Aero-Engine Beijing 100191 China

A numerical study was conducted to seek an optimized dimension of jet chamber in the pulsating impinging *** flow and heat transfer effect of the pulsation flow through a jet chamber was *** numerical results indicate that heat transfer effective enhances near the stagnation region for the intermittent pulsed flow with jet chamber compared to that without jet *** of the flow through a jet chamber show that the heat transfer rate on the impingement surface is highly dependent on the velocity at the position which is really close to target *** of the velocity field suggests that the velocity exists a maximum value as the axis distance *** addition,the velocity at the jet hole is enlarged by the jet chamber due to the entrainment effect,and the velocity is amplified even greater as the size of the jet chamber becomes ***,the velocity declines quickly while the flow axis distance is more than a certain range,leading to poor heat ***,intermittent pulsed flow with jet chamber is suggested as a method of improving heat transfer by employing larger dimensions of jet chamber for appropriate jet-to-surface spacing.

关键词： pulsed impinging jet intermittent pulsation jet chamber Nusselt number

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政策赋能、业务扩容、系统转型——对县级融媒体中心建设中几个关键概念的观察辨析

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新闻界 2020年第6期 62-70页

作者：朱天唐婵四川大学文学与新闻学院成都610043

县级融媒体中心建设自2018年在全国开始推进以来,目前已进入到建设的关键阶段。从当下的建设进程来看,由于建设主体对相关核心概念认识与把握的局限性,引发了建设中的若干问题。其中最为关键的三个核心概念:具有建设基础指导价值的"政... 详细信息

县级融媒体中心建设自2018年在全国开始推进以来,目前已进入到建设的关键阶段。从当下的建设进程来看,由于建设主体对相关核心概念认识与把握的局限性,引发了建设中的若干问题。其中最为关键的三个核心概念:具有建设基础指导价值的"政策赋能"、具有运作核心意义的"业务扩容"、具有发展方向指引作用的"系统转型",更是须进一步加以厘清的重点。本文从上述三个核心概念出发,结合实际建设中存在的问题,来探讨其在县级融媒体中心建设工作推进中的价值与作用。

关键词：县级融媒体中心观念辨析网络社会县域治理

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Topologically protected entanglement switching around exceptional points

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Light(Science & Applications) 2024年第8期13卷 1631-1644页

作者： Zan tang Tian Chen Xing tang Xiangdong Zhang Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of Technology100081 BeijingChina

The robust operation of quantum entanglement states is crucial for applications in quantum information,computing,and communications^(1–3).However,it has always been a great challenge to complete such a task because of decoherence and ***,we propose theoretically and demonstrate experimentally an effective scheme to realize robust operation of quantum entanglement states by designing quadruple degeneracy exceptional *** encircling the exceptional points on two overlapping Riemann energy surfaces,we have realized a chiral switch for entangled states with high *** to the topological protection conferred by the Riemann surface structure,this switching of chirality exhibits strong robustness against perturbations in the encircling ***,we have experimentally validated such a scheme on a quantum walk *** work opens up a new way for the application of non-Hermitian physics in the field of quantum information.

关键词： exceptional quantum Riemann

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An economic way to achieve all-weather CO2 reduction

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National Science Review 2024年第3期11卷 46-47页

作者： Junwang tang Department of Chemical Engineering University College London

Utilising solar power to convert carbon dioxide（CO2） into hydrocarbon fuels presents an eco-friendly method to address dependence on fossil fuels and contribute to a net-zero CO2emission goal[1,2].

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