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Stretchable,Transparent,and Ultra-Broadband Terahertz Shielding Thin Films Based on Wrinkled MXene Architectures

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Nano-Micro Letters 2024年第9期16卷 110-122页

作者： Shaodian Yang Zhiqiang Lin Ximiao Wang Junhua huang Rongliang Yang zibo Chen Yi Jia Zhiping Zeng Zhaolong Cao Hongjia Zhu Yougen hu Enen Li huanjun Chen Tianwu Wang Shaozhi Deng Xuchun Gui State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275People’s Republic of China National Key Laboratory of Materials for Integrated Circuits Shenzhen Institute of Advanced Electronic MaterialsShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China Guangdong Province Key Laboratory of Display Material and Technology Guangzhou 510275People’s Republic of China China Academy of Aerospace Science and Innovation Beijing 100176People’s Republic of China School of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275People’s Republic of China GBA Branch of Aerospace Information Research Institute Chinese Academy of SciencesGuangzhou 510700People’s Republic of China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049People’s Republic of China Guangdong Provincial Key Laboratory of Terahertz Quantum Electromagnetics Guangzhou 510700People’s Republic of China

With the increasing demand for terahertz(THz)technology in security inspection,medical imaging,and flexible electronics,there is a significant need for stretchable and transparent THz electromagnetic interference(EMI)shielding *** EMI shielding materials,like opaque metals and carbon-based films,face challenges in achieving both high transparency and high shielding efficiency(SE).Here,a wrinkled structure strategy was proposed to construct ultra-thin,stretchable,and transparent terahertz shielding MXene films,which possesses both isotropous wrinkles(height about 50 nm)and periodic wrinkles(height about 500 nm).Compared to flat film,the wrinkled MXene film(8 nm)demonstrates a remarkable 36.5%increase in SE within the THz *** wrinkled MXene film exhibits an EMI SE of 21.1 dB at the thickness of 100 nm,and an average EMI SE/t of 700 dBμm^(−1)over the 0.1-10 *** calculations suggest that the wrinkled structure enhances the film’s conductivity and surface plasmon resonances,resulting in an improved THz wave ***,the wrinkled structure enhances the MXene films’stretchability and *** bending and stretching(at 30%strain)cycles,the average THz transmittance of the wrinkled film is only 0.5%and 2.4%,*** outstanding performances of the wrinkled MXene film make it a promising THz electromagnetic shielding materials for future smart windows and wearable electronics.

关键词： Terahertz Wrinkle structure Electromagnetic interference shielding MXene

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磷石膏-炭化污泥胶凝材料力学性能试验研究

矿产综合利用 2020年第4期41卷 196-201页

作者：胡敏彭丽郭娜颜子博德阳市建材环保资源化工程技术研究中心四川德阳618000 成都理工大学材料与化学化工学院四川成都610059

以磷石膏和炭化污泥为主要原料,氢氧化钠为激发剂,采用一步法制备磷石膏-炭化污泥胶凝材料,通过对炭化污泥/磷石膏配比、水泥掺量对力学性能影响的试验研究,确定磷石膏-炭化污泥胶凝材料配比。结果表明:在标准养护条件下,随着水泥掺量降... 详细信息

以磷石膏和炭化污泥为主要原料,氢氧化钠为激发剂,采用一步法制备磷石膏-炭化污泥胶凝材料,通过对炭化污泥/磷石膏配比、水泥掺量对力学性能影响的试验研究,确定磷石膏-炭化污泥胶凝材料配比。结果表明:在标准养护条件下,随着水泥掺量降低,磷石膏-炭化污泥胶凝材料强度亦降低。当炭化污泥/磷石膏=6:4时,早期抗折强度最高可达4.2 MPa,抗压强度为15.2 MPa。

关键词：激发剂工业废渣资源化复合胶凝材料力学性能

地震辐射能量测定方法研究及其在汶川8.0级地震中的应用

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地球物理学报 2022年第12期65卷 4775-4788页

作者：孔韩东刘瑞丰边银菊李赞王子博胡岩松中国地震局地球物理研究所北京100081

地震辐射能量是关于震源定量的特征量,地震辐射能量的测定是地震定量化研究中一个重要的基本问题.本文基于点源震源模型,开展了地震辐射能量测定方法的研究,推导了计算地震辐射能量的理论公式,自主研发了一套利用远场垂直向P波记录测定... 详细信息

地震辐射能量是关于震源定量的特征量,地震辐射能量的测定是地震定量化研究中一个重要的基本问题.本文基于点源震源模型,开展了地震辐射能量测定方法的研究,推导了计算地震辐射能量的理论公式,自主研发了一套利用远场垂直向P波记录测定地震辐射能量的软件系统,能够快速测定全球范围内5.5级以上浅源地震的地震辐射能量.以2008年5月12日汶川8.0级地震为例,检验了地震辐射能量测定方法和软件系统的科学性和准确性,研究结果表明:(1)汶川地震的地震辐射能量为2.84×10^(16) J,各台站地震辐射能量的分布与震中距和方位角都没有明显的依赖关系,说明使用理论格林函数法消除路径效应对地震辐射能量测定的约束效果较好;(2)汶川地震的能量震级M_(e)为8.04,震源机制校正可以使能量震级测定结果的标准差更小,结果更稳定;(3)反演得到汶川地震的地震矩为8.97×10^(20) N·m,转化为矩震级M_(W)为7.9,M_(e)比M_(W)高0.14,说明汶川地震的地震辐射能量偏高.(4)汶川地震的能矩比为3.17×10^(-5),约为全球浅源地震平均能矩比的2.6倍,约为全球逆冲型地震平均能矩比的4倍,地震辐射能量释放效率明显偏高;能矩比取对数可得慢度系数为-4.50,慢度系数可以更直观地显示地震辐射能量释放效率的高低,更适合在普通群众中推广.(5)地震辐射能量、能量震级、能矩比、慢度系数和等效震级差这些新的地震参数,能够定量表示震源的动态特性,对于地震灾害快速评估具有重要意义.

关键词：地震辐射能量汶川地震能量震级能矩比慢度系数等效震级差

Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl_(2) via modifying cellulose structure

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Chinese Journal of Chemical Engineering 2024年第5期69卷 227-237页

作者： Linghui Kong Chao Li Runxing Sun Shu Zhang Yi Wang Jun Xiang Song hu Dong Wang Chuanjun Leng Xun hu School of Material Science and Engineering University of JinanJinan 250022China Joint International Research Laboratory of Biomass Energy and Materials College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China Shandong BASAN Graphite New Material Plant Zibo 255311China

Development of pore structures of activated carbon(AC)from activation of biomass with ZnCl_(2) relies on content and structure of cellulose/hemicellulose in the *** pretreatment of biomass could induce dehydration and/or aromatization to change the structure of cellulose/*** might interfere with evolution of structures of AC,which was investigated herein via thermal pretreatment of willow branch(WB)from 200 to 360℃and the subsequent activation with ZnCl_(2) at 550℃.The results showed that thermal pretreatment at 360℃(WB-360)could lead to substantial pyrolysis to form biochar,with a yield of 31.9%,accompanying with nearly complete destruction of cellulose crystals and remarkably enhanced aromatic ***,cellulose residual in WB-360 could still be activated to form AC-360 with specific surface area of 1837.9 m~2·g^(-1),which was lower than that in AC from activation of untreated WB(AC-blank,2077.8 m~2·g^(-1)).Nonetheless,the AC-200 from activation of WB-200 had more developed pores(2113.9 m~2·g^(-1))and superior capability for adsorption of phenol,due to increased permeability of ZnCl_(2) to the largely intact cellulose structure in *** thermal pretreatment did increase diameters of micropores of AC but reduced the overall yield of AC(26.8%for AC-blank versus 18.0%for AC-360),resulting from accelerated cracking but reduced intensity of ***-situ infrared characterization of the activation showed that ZnCl_(2) mainly catalyzed dehydration,dehydrogenation,condensation,and aromatization but not cracking,suppressing the formation of derivatives of cellulose and lignin in *** thermal pretreatment formed phenolic-OH and C=O with higher chemical innerness,which changed the reaction network in activation,shifting morphology of fibrous structures in AC-blank to“melting surface”in AC-200 or AC-280.

关键词： Thermal pretreatment Activation with ZnCl_(2) Willow branch Activated carbon Biochar

Multi-view recognition of fruit packing boxes based on features clustering angle

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High Technology Letters 2021年第2期27卷 200-209页

作者： Li Xinning Wu hu Yang Xianhai School of Mechanical Engineering Shandong Universily of TechnologyZibo 255000P.R.China

In order to realize the intelligent mechanization of the last process of the fruit industry chains,the identification of fruit packing boxes is researched.A multi-view database is established to describe the omnidirectional attitudes of the fruit packing *** order to reduce the data redundancy caused by multi-view acquisition,a new binary multi-view kernel principal component analysis network(BMKPCANet) is built,and a multi-view recognition method of fruit packing boxes is proposed based on the BMKPCANet and support vector machine(SVM).The experimental results show that the recognition accuracy of proposed BMKPCANet is 12.82% higher than PCANet and3.51% higher than KPCANet on *** time consumption of proposed BMKPCANet is 7.74%lower than PCANet and 29.01% lower than KPCANet on *** work has laid a theoretical foundation for multi-view recognition of 3 D objects and has a good practical application value.

关键词： boxes recognition kernel principal component analysis(KPCA) binary hashing and clustering multi-view clustering(MVC)

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绝经期综合征血管舒缩功能失调病因病机探讨

山东中医杂志 2009年第3期28卷 150-151页

作者：程瑛胡浩淄博市中医院山东淄博255300

绝经期综合征血管舒缩功能失调导致的潮热、汗出是最常见且最有特征性的绝经期症状,肾虚是其主要病机;营卫失调,少阳枢机不利是潮热、汗出的重要机制。临床辨证分型为肾阴虚证,肾阴阳俱虚证,营卫失调、经气不利证。治疗宜滋养肾阴,佐以... 详细信息

绝经期综合征血管舒缩功能失调导致的潮热、汗出是最常见且最有特征性的绝经期症状,肾虚是其主要病机;营卫失调,少阳枢机不利是潮热、汗出的重要机制。临床辨证分型为肾阴虚证,肾阴阳俱虚证,营卫失调、经气不利证。治疗宜滋养肾阴,佐以潜阳敛汗,阴阳双补,调和营卫,疏利三焦,以达到"观其脉证,知犯何逆,随证治之"的目的。

关键词：绝经期综合征血管舒缩功能失调潮热汗出病因病机治法

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无溶剂固相微萃取技术

色谱 1999年第2期17卷 171-174页

作者：胡孔诚邢桂芹梁汉昌齐鲁石化公司研究院山东淄博255400

对SPME原理、操作模式、影响灵敏度的因素、应用和其发展前景作了介绍。

关键词：色谱固相微萃取 SPME 分离技术样品预处理

2022年1月8日青海门源M_(S)6.9地震的静态和动态震源参数测定

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地球物理学报 2023年第6期66卷 2420-2430页

作者：王子博刘瑞丰李赞胡岩松孔韩东中国地震局地球物理研究所北京100081

震源特征可通过震源参数量化,震后快速测定震源参数,对于研究区域构造特征、地震的震源性质和孕育演化过程、开展震害评估和地震应急响应都具有重要意义.本研究采用区域地震台网和全球地震台网提供的宽频带波形资料,使用近震全波形反演... 详细信息

震源特征可通过震源参数量化,震后快速测定震源参数,对于研究区域构造特征、地震的震源性质和孕育演化过程、开展震害评估和地震应急响应都具有重要意义.本研究采用区域地震台网和全球地震台网提供的宽频带波形资料,使用近震全波形反演方法得到了2022年1月8日青海门源M_(S)6.9地震的地震矩、矩震级和震源机制解等静态震源参数,并测定了地震辐射能量、能量震级和破裂持续时间等动态震源参数.结果显示:(1)本次地震为一次高倾角的走滑型地震,震源机制解节面I走向194°、倾角87°、滑动角175°,节面II走向285°、倾角85°、滑动角3°,地震矩为8.5×10^(18)N·m,转化成矩震级为6.6,矩心深度为3 km.结合动态震源参数,可确定节面II为地震断层面;(2)地震辐射能量为4.3×10^(14)J,转化成能量震级为6.8,高于矩震级;(3)地震呈现双侧破裂特征,破裂持续时间为11 s;(4)能矩比为5.1×10^(-5),视应力为1.53 MPa,应力降为6.58 MPa,描述断层破裂复杂度的辐射能量增强因子为34;(5)综合本文结果,可认为门源地震属于一次断层倾角较高、能量释放效率偏高的走滑型地震.与同样震级的地震相比,这样的地震一般会造成比较严重的灾害.

关键词：门源MS6.9地震震源参数震源机制震源特征

专用指令集在基于FPGA的神经网络加速器中的应用

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空间控制技术与应用 2020年第3期46卷 36-41,54页

作者：胡航天刘凯马士超郭子博西安电子科技大学计算机科学与技术学院西安710071

近年来,表现出极其优越性能的神经网络算法对硬件算力的要求逐渐提高.在一些低功耗场景如星载系统中,拥有可编程重构、高并行等特性的FPGA是神经网络算法较为合适的硬件加速平台.为了解决传统神经网络硬件加速器设计中片内资源消耗大、... 详细信息

近年来,表现出极其优越性能的神经网络算法对硬件算力的要求逐渐提高.在一些低功耗场景如星载系统中,拥有可编程重构、高并行等特性的FPGA是神经网络算法较为合适的硬件加速平台.为了解决传统神经网络硬件加速器设计中片内资源消耗大、各功能模块耦合性高等问题,设计实现了一套专用AI指令集并应用在了基于FPGA的神经网络加速器的设计中.文章首先介绍了该指令集的设计方案.整个指令集由指令寄存器、指令解释器、指令转发模块、内存管理单元和多个模块构成.通过该指令集可实现对不同模块的复用,降低模块之间的耦合性.并以YOLOV3-Tiny网络模型为例,对比了平铺式和指令控制式两种加速方案的逻辑资源的消耗.验证了应用专用指令集可以减少约50%的FPGA逻辑资源的使用.

关键词：指令集神经网络 FPGA