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Biomimetic porous silicon oxycarbide ceramics with improved specific strength and efficient thermal insulation

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Journal of Materials Science & Technology 2024年第1期168卷 185-193页

作者： Zhuoqing zhang jinghan li Lei Cao Yu Shi Huajie Yang Rui Yang Fan Xie Xing zhang Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Shenyang Ligong UniversityShenyang 110159China Shenyang Aircraft Design and Research Institute Shenyang 110035China

Considering the challenge of aerodynamic heating,the development of high-performance insulating ce-ramic materials with lightweight and low thermal conductivity is crucially important for aerospace vehi-cles to achieve flight at high speed for a long *** this work,macro-porous silicon oxycarbide(SiOC)ceramics with directional pores(DP-SiOC)(mean pore size of 88.1μm)were prepared using polysiloxane precursors via freeze casting and photocrosslinking,followed by *** DP-SiOC samples were lightweight(density∼0.135 g cm^(-3))with a porosity of 90.4%,which showed good shapability through the molding of polysiloxane *** DP-SiOC samples also exhibited an ultra-low thermal con-ductivity of 0.048 W(m K)^(-1)at room temperature,which can also withstand heat treatment at 1200°C for 1 *** addition,scaffolds with triply periodic minimal surfaces(TPMS)were fabricated using digital light processing(DLP)printing,which was further filled with polysiloxane precursors for increasing the strength of *** TPMS scaffolds filled with macro-porous SiOC ceramics(TPMS-DP-SiOC)showed good integration between TPMS and macro-pore structures,which had a porosity∼75%and high specific strength of 9.73×10^(3)N m kg^(-1).The thermal conductivity of TPMS-DP-SiOC samples was 0.255 W(m K)^(-1)at room *** biomimetic TPMS-DP-SiOC ceramics developed in this study are likely used for thermal protection systems.

关键词： Thermal insulation light weight Macro-porous ceramics SiOC

From VIB‑to VB‑Group Transition Metal Disulfides:Structure Engineering Modulation for Superior Electromagnetic Wave Absorption

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Nano-Micro Letters 2024年第2期16卷 218-257页

作者： Junye Cheng Yongheng Jin jinghan Zhao Qi Jing Bailong Gu Jialiang Wei Shenghui Yi Mingming li Wanli Nie Qinghua Qin Deqing zhang Guangping Zheng Renchao Che Department of Materials Science Shenzhen MSU-BIT UniversityShenzhen 517182People’s Republic of China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Materials Science and Engineering Qiqihar UniversityQiqihar 161006People’s Republic of China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHung HomKowloonHong KongPeople’s Republic of China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438People’s Republic of China Zhejiang Laboratory Hangzhou 311100People’s Republic of China

The laminated transition metal disulfides(TMDs),which are well known as typical two-dimensional(2D)semiconductive materials,possess a unique layered structure,leading to their wide-spread applications in various fields,such as catalysis,energy storage,sensing,*** recent years,a lot of research work on TMDs based functional materials in the fields of electromagnetic wave absorption(EMA)has been carried ***,it is of great significance to elaborate the influence of TMDs on EMA in time to speed up the *** this review,recent advances in the development of electromagnetic wave(EMW)absorbers based on TMDs,ranging from the VIB group to the VB group are *** compositions,microstructures,electronic properties,and synthesis methods are presented in ***,the modulation of structure engineering from the aspects of heterostructures,defects,morphologies and phases are systematically summarized,focusing on optimizing impedance matching and increasing dielectric and magnetic losses in the EMA materials with tunable EMW absorption *** as well as the challenges are also identified to guide the design of new TMDs based dielectric EMA materials with high performance.

关键词： Transition metal disulfides Electromagnetic wave absorption Impedance matching Structure engineering modulation

Coxsackievirus B3 HFMD animal models in Syrian hamster and rhesus monkey

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Virologica Sinica 2024年第2期39卷 290-300页

作者： Suqin Duan Wei zhang Yongjie li Yanyan li Yuan Zhao Weihua Jin Quan liu Mingxue li Wenting Sun lixiong Chen Hongjie Xu Jie Tang jinghan Hou Zijun Deng Fengmei Yang Shaohui Ma Zhanlong He Institute of Medical Biology Chinese Academy of Medical Sciences Medical Primate Research Center Peking Union Medical CollegeYunnan Key Laboratory of Vaccine Research Development on Severe Infectious DiseaseKunming650118China

Coxsackievirus B3(CVB3)is the pathogen causing hand,foot and mouth disease(HFMD),which manifests across a spectrum of clinical severity from mild to ***,CVB3-infected mouse models mainly demonstrate viral myocarditis and pancreatitis,failing to replicate human HFMD *** several enteroviruses have been evaluated in Syrian hamsters and rhesus monkeys,there is no comprehensive data on *** this study,we have first tested the susceptibility of Syrian hamsters to CVB3 infection via different *** results showed that Syrian hamsters were successfully infected with CVB3 by intraperitoneal injection or nasal drip,leading to nasopharyngeal colonization,acute severe pathological injury,and typical HFMD ***,the nasal drip group exhibited a longer viral excretion cycle and more severe pathological *** the subsequent study,rhesus monkeys infected with CVB3 through nasal drips also presented signs of HFMD symptoms,viral excretion,serum antibody conversion,viral nucleic acids and antigens,and the specific organ damages,particularly in the ***,there were no significant differences in myocardial enzyme levels,and the clinical symptoms resembled those often associated with common,mild *** summary,the study successfully developed severe Syrian hamsters and mild rhesus monkey models for CVB3-induced *** models could serve as a basis for understanding the disease pathogenesis,conducting pre-trial prevention and evaluation,and implementing post-exposure intervention.

关键词： Coxsackievirus B3(CVB3) Hand foot and mouth disease(HFMD) Animal models Syrian hamster Rhesus monkey

Utlra-fast hydrolysis performance of MgH2 catalyzed by Ti-Zr-Fe-Mn-Cr-V high-entropy alloys

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Journal of Energy Chemistry 2024年第11期 77-86页

作者： Jinting Chen Tingting Xu Zeyu zhang jinghan zhang Haixiang Huang Bogu liu Yawei li Jianguang Yuan Bao zhang Ying Wu School of Energy Power and Mechanical Engineering North China Electric Power University Institute of Energy Power Innovation North China Electric Power University

Hydrogen energy is one of the ideal energy alternatives and the upstream of the hydrogen industry chain is hydrogen production,which can be achieved via the reaction of inorganic materials with water,known as *** inorganic materials,the high hydrogen capacity for hydrolysis of MgH2（15.2 wt%）makes it a promising material for hydrogen production via ***,the dense Mg（OH）2passivation layer will block the reaction between MgH2and the solution,resulting in low hydrogen yield and sluggish hydrolysis *** this work,the hydrogenyield and hydrogen generation rate of MgH2are considerably enhanced by adding Ti-Zr-Fe-Mn-Cr-V high-entropy alloys（HEAs） for the first *** *** MgH2-3 wt% TiZrFe1.5MnCrV0.5(labelled as MgH2-3 wt% Fe1.5) composite releases 1526.70 mL/g H2within 5 min at 40℃,and the final hydrolysis conversion rate reaches 95.62% within 10 *** mean hydrogen generation rate of the MgH2-3 wt% Fe1.5composite is 289.16 mL/g/min,which is 2.38 times faster than that of pure ***,the activation energy of the MgH2-3 wt% Fe1.5composite is calculated to be 12.53 kJ/mol. The density functional theory（DFT） calculation reveals that the addition of HEAs weakens the Mg-H bonds and accelerates the electron transfer between MgH2and HEAs,Combined with the cocktail effect of HEAs as well as the formation of more interfaces and micro protocells,the hydrolysis performance of MgH2is considerably *** work provides an appealing prospect for real-time hydrogen supply and offers a new effective strategy for improving the hydrolysis performance of MgH2.

关键词：

近岸浅水区风浪推算中等效水深的概念及其计算方法

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海洋通报 1985年第3期 1-7页

作者：张经汉李少英中国科学院南海海洋研究所中国科学院南海海洋研究所

在海岸和近海工程设计和施工中,往往需要解决从外海至近岸浅水区的风浪推算问题。规范和板本·井岛将风区按水深分为若干段,用等效风要素的办法从远到近逐段推算风浪,直至预报点。Bretschneider考虑底摩擦等因素,取整个风区内海底的... 详细信息

在海岸和近海工程设计和施工中,往往需要解决从外海至近岸浅水区的风浪推算问题。规范和板本·井岛将风区按水深分为若干段,用等效风要素的办法从远到近逐段推算风浪,直至预报点。Bretschneider考虑底摩擦等因素,取整个风区内海底的平均比降f/m来预报浅水区的风浪。这些方法,理论较完整,应用也较为广泛,对海底平坦的浅

关键词：浅水区风区平均比降近海工程底坡计算方法破碎波高平均坡度方位线计算点

基于poly-Si键合层的SACM型Ge/Si APD的优化设计研究

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中国激光 2024年第8期51卷 46-59页

作者：张娟苏小萍李嘉辉王战仁柯少颖闽南师范大学物理与信息工程学院光场调控及其系统集成应用福建省高校重点实验室福建漳州363000

Ge/Si雪崩光电二极管(APD)被广泛应用于近红外探测领域,但由于Ge和Si之间存在4.2%的晶格失配,故难以获得高性能的Ge/Si APD。提出在Ge/Si键合界面处引入多晶硅(poly-Si)键合中间层,弱化Ge/Si失配晶格对APD器件性能的影响。poly-Si引入... 详细信息

Ge/Si雪崩光电二极管(APD)被广泛应用于近红外探测领域,但由于Ge和Si之间存在4.2%的晶格失配,故难以获得高性能的Ge/Si APD。提出在Ge/Si键合界面处引入多晶硅(poly-Si)键合中间层,弱化Ge/Si失配晶格对APD器件性能的影响。poly-Si引入后键合界面电场发生变化,导致APD内部的电场重新分布,极大地影响了器件性能。因此,重点对Ge吸收层和Si倍增层的掺杂浓度进行调控,探究了掺杂浓度对Ge/Si APD电场、复合率、载流子浓度、碰撞电离等性能的影响,最终设计出高性能键合Ge/Si APD。本工作将为低噪声、高增益Ge/Si APD的研究提供理论指导。

关键词：材料 Ge/Si雪崩光电二极管晶格失配 poly-Si键合层掺杂浓度

分布式新能源接入的10 kV配电网保护适应性分析

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电力建设 2024年第2期45卷 49-57页

作者：袁兆祥张翼聂铭李猛和敬涵国网经济技术研究院有限公司北京市102209 国家电网有限公司北京市100031 北京交通大学电气工程学院北京市100044

分布式电源(distributed generation,DG)的并网运行改变了传统单辐射式供电网络结构,同时潮流和负荷电流的双向流动影响了电力系统的安全稳定运行。针对分布式新能源接入10 kV配电网场景下的线路保护适应性进行分析,根据分布式电源接入... 详细信息

分布式电源(distributed generation,DG)的并网运行改变了传统单辐射式供电网络结构,同时潮流和负荷电流的双向流动影响了电力系统的安全稳定运行。针对分布式新能源接入10 kV配电网场景下的线路保护适应性进行分析,根据分布式电源接入位置不同,理论分析了新能源电源接入造成的助增电流、外汲电流、反向电流等对配电网现有保护的影响,明晰了分布式电源容量对保护性能的影响,量化了10 kV配电网保护性能边界条件,对于后续的保护配置方案以及保护新原理的研究提供理论支撑。仿真结果验证了保护适应性分析的正确性。

关键词：分布式电源(DG) 10 kV配电网保护适应性边界条件

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基于金纳米棒刻蚀比色法检测铁、铜离子

无机化学学报 2024年第5期40卷 953-962页

作者：李红丁晓莹刘慈航张靖涵饶艳英福州大学环境与安全工程学院福州350000 莆田学院环境与生物工程学院福建省新型污染物生态毒理效应与控制重点实验室生态环境及其信息图谱福建省高等学校重点实验室莆田351100

采用种子生长法制备金纳米棒(AuNRs)以构建光学传感器,用于Fe^(3+)和Cu^(2+)的高选择性快速可视化检测。在酸性环境中,Fe^(3+)和Cu^(2+)通过与KI溶液反应,将I-氧化成I2。I2刻蚀AuNRs,导致其纵向表面等离子体共振(LSPR)吸收峰蓝移,从而... 详细信息

采用种子生长法制备金纳米棒(AuNRs)以构建光学传感器,用于Fe^(3+)和Cu^(2+)的高选择性快速可视化检测。在酸性环境中,Fe^(3+)和Cu^(2+)通过与KI溶液反应,将I-氧化成I2。I2刻蚀AuNRs,导致其纵向表面等离子体共振(LSPR)吸收峰蓝移,从而实现对Fe^(3+)和Cu^(2+)的检测。结果表明,反应温度为50℃时,添加0.8 mL 0.1 mol·L^(-1)HCl、2 mL AuNRs生长液和20 mmol·L^(-1)KI溶液,与2 mL 500μmol·L^(-1)Fe^(3+)或30μmol·L^(-1)Cu^(2+)反应25或90 min,可将AuNRs刻蚀至LSPR吸收峰消失。该方法对Fe^(3+)和Cu^(2+)检测具有高选择性和准确性,对于Fe^(3+)、Cu^(2+)共存体系的检测,可通过加入适量F-与Fe^(3+)生成配合物[FeF_(6)]^(3-)完成对Fe^(3+)的化学掩蔽,消除Fe^(3+)的干扰,实现共存体系中Cu^(2+)的准确检测。

关键词：金纳米棒铁离子铜离子比色法检测

基于有序Logit-ISM模型的农村集体产权制度改革村民满意度影响因素研究——来自福建省的调查

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中国农业资源与区划 2024年第6期45卷 190-198页

作者：黄静晗李静静张悦东福建农林大学公共管理与法学院

[目的]农村集体产权制度改革是涉及亿万村民利益的重大制度创新，村民满意度是衡量改革绩效的主要标尺。研究农村集体产权制度改革村民满意度的影响因素，对提高村民满意度、提升改革绩效、深化改革发展具有重要意义。[方法]文章基于福... 详细信息

[目的]农村集体产权制度改革是涉及亿万村民利益的重大制度创新，村民满意度是衡量改革绩效的主要标尺。研究农村集体产权制度改革村民满意度的影响因素，对提高村民满意度、提升改革绩效、深化改革发展具有重要意义。[方法]文章基于福建省农村固定观察点830份调研问卷数据，应用有序Logit回归模型分析村民对农村集体产权制度改革满意度的影响因素，并利用ISM模型进一步分析各影响因素间的逻辑关系与层级结构。[结果]（1）有序Logit模型回归结果显示，受教育程度、社会关系、家庭收入水平、公平感知、政策认知和村民参与对村民满意度产生了显著影响。（2） ISM模型分析发现，公平感知和政策认知是表层直接因素，村民参与是中层间接因素，社会关系、家庭收入水平和受教育程度是深层根源因素。[结论]为提升村民对改革的满意度，应加强改革宣导，拓宽参与渠道，建立反馈机制，积极推动村民参与改革、提升村民的公平感知和政策认知水平，同时发展壮大农村集体经济、增加村民财产性收入以增强村民获得感。

关键词：农村集体产权制度改革村民满意度影响因素有序Logit回归 ISM模型