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Scalable van der Waals graphene films for electro-optical regulation and thermal camouflage

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InfoMat 2023年第6期5卷 78-88页

作者： ziqi Li Xujiang Chao Andrew Balilonda Wei Chen Research Institute for Intelligent Wearable Systems The Hong Kong Polytechnic UniversityHong Kongthe People's Republic of China The Hong kong Polytechnic University Shenzhen Research Institute Shenzhenthe People's Republic of China School of Mechanical Engineering Northwestern Polytechnical UniversityXianShaanxithe People's Republic of China

Graphene exhibits enormous advantages in mid-infrared(MIR)regulation because of the active control,precise regulation,and large modulation *** graphene films are prepared via chemical vapor deposition(CVD)or reduction,which cannot realize large-scale production and limit the *** films with van der Waals(vdW)structure enable excellent mechanical and electrical performance for flexible electrodes and electronics and might be a candidate for MIR ***,current techniques for preparing vdW graphene films require binder or solution assistance,resulting in chemical residues and performance ***,a new strategy for preparing large-area vdW graphene films by simple mechanical adhesion without any additives was *** selecting the carriers and substrates with proper fracture energies,graphene nanosheets can be transferred from one polymer to another with a layer-by-layer *** obtained graphene films possess desired thickness and comparable electrical conductivity(92.8±4.6 ohm sq–1)with those by chemical vapor *** are of high compactness even for ions to intercalate reversibly,which exhibit excellent electrochemical activity and electro-optical regulation capability,effectively suppressing 90%thermal *** strategy can be extended to prepare high-performance vdW graphene films on various polymer substrates and used for sustainable and smart electro-optical applications.

关键词： dynamic emissivity electrochemical device graphene thermal camouflage van der Waals film

地表基质调查分层及分层测试指标体系设计与构建

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岩矿测试 2024年第1期43卷 16-29页

作者：刘玖芬赵晓峰侯红星秦天陈占生徐立明杨柯孔繁鹏刘晓煌卢兵李子奇刘佳包茹意郝爱兵中国地质大学(北京) 北京100083 中国地质调查局自然资源综合调查指挥中心北京100055 自然资源要素耦合过程与效应重点实验室北京100055 中国地质调查局廊坊自然资源综合调查中心河北廊坊065000 中国地质调查局地球物理调查中心河北廊坊065004 中国地质调查局哈尔滨自然资源综合调查中心黑龙江哈尔滨150081 中国地质调查局牡丹江自然资源综合调查中心黑龙江牡丹江157000 中国地质大学(武汉) 湖北武汉430074

地表基质是地球表层物质与能量循环的主要载体,地表基质调查是一项创新性工作,明确地表基质调查分层及分层测试指标是开展地表基质调查的基础。本文基于地表基质调查的内涵和目标定位,深入分析了多目标区域地球化学调查、全国第三次土... 详细信息

地表基质是地球表层物质与能量循环的主要载体,地表基质调查是一项创新性工作,明确地表基质调查分层及分层测试指标是开展地表基质调查的基础。本文基于地表基质调查的内涵和目标定位,深入分析了多目标区域地球化学调查、全国第三次土壤普查和全国农用地土壤污染详查等调查深度和测试指标;利用近三年自然资源综合调查指挥中心在吉林省梨树县、辽宁省丹东市、黑龙江省哈尔滨市三个地表基质调查试点项目实测数据,运用变动系数法分析了不同地区地表基质层的地球化学元素垂向变化特征,结合表生地质作用(风化为主)最大深度、地表植被根系最大深度、浅层地下水位波动下限、基岩顶面深度等因素,将地表基质在垂向上大致分为三层:表层(0~2m)、中层(2~10m)和深层(10~20m),基岩埋深浅于20m则以揭露到基岩为准;表层(0~2m),称为生产层,包括支撑农业生产的耕作层,主要服务国家粮食安全,以收集资料为主;中层(2~10m),称为生态层,主要支撑植被生长和群落演替,服务国土空间开发保护与格局优化,是地表基质调查的重点;深层(10~20m),称为沉积层,主要研究地表基质从基岩—深层—中层—表层演替规律和特征,以部署少量工程控制为宜。基于地表基质分层调查意义,结合元素在垂向上的变化规律,提出4+N型地表基质分层测试指标体系,即4类必测指标和针对特殊工作需要的N类选测指标,以期加快推进地表基质调查标准化、规范化。

关键词：地表基质地表基质调查地表基质调查分层分层测试指标

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Chlorine‑Rich Substitution Enabled 2D3D Hybrid Perovskites for High Efficiency and Stability in Sn‑Based Fiber‑Shaped Perovskite Solar Cells

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Advanced Fiber Materials 2023年第1期5卷 296-311页

作者： Andrew Balilonda ziqi Li Chuanyao Luo Xiaoming Tao Wei Chen Research Centre for Smart Wearable Technology School of Fashion and TextilesThe Hong Kong Polytechnic UniversityHung HomHong Kong 999077People’s Republic of China Research Institute for Intelligent Wearable Systems The Hong Kong Polytechnic UniversityHung HomHong Kong 999077People’s Republic of China The Hong kong Polytechnic University Shenzhen Research Institute Shenzhen 518057People’s Republic of China

Despite the impressive power conversion efficiency(PCE)beyond 25.5%,perovskite solar cells,especially the Sn-based variants,are poorly stable under normal operating conditions compared with the market-dominant silicon solar cells that can last for over 25 years.2D3D hybrid perovskite materials are one of the best options to overcome the instability chal-lenge without compromising ***,a record performance of 1 year was reported in Pb-based 2D3D planar per-ovskite ***,the reaction between 2 and 3D perovskite molecules requires high temperatures(-300°C)and increased reaction time(-24 h)to achieve high-quality 2D3D hybrid ***,we base on the ability of chlorine to displace iodine from its ionic compounds in solutions to utilize chloride ions as catalysts for speeding up the reaction between iodine-based 2D and 3D perovskite *** approach reduces the reaction time to-20 min and the reaction temperature to-100°C with the formation of high-quality 2D3D hybrid perovskites,free from pure 2D *** the synthesized 2D3D hybrid perovskite material with 50%chlorine doping in a fiber-shaped solar cell architecture yielded the highest reported PCE of 11.96%in Sn-based fiber-shaped perovskite solar *** unencapsulated and encapsulated fiber-shaped solar cells could maintain 75%and 95.5%of their original PCE,respectively,after 3 months under room light and relative humidity of 35–40%,revealing the champion stability in Sn-based perovskite solar *** solar yarn also demonstrated constant energy output under changing light incident angles(0–180°).

关键词： Fiber-shaped perovskite solar cells 2D3D hybrid perovskites Chlorine doping Tin-based perovskites

Influence of imidazole derivatives on the dielectric and energy storage performance of epoxy

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High Voltage 2022年第4期7卷 782-791页

作者： Jiaming Luo Lei Zhang Wenjie Sun Jiale Mao Yiting Zheng Shuang Wang ziqi Zhang Yingxin Chen Yonghong Cheng State Key Laboratory of Electrical Insulation and Power Equipment Centre of Nanomaterials for Renewable EnergySchool of Electrical EngineeringXi'an Jiaotong UniversityXi'anChina Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyKowloonHong Kong College of Materials and Environmental Engineering Hangzhou Dianzi UniversityHangzhouChina

Imidazoles are widely used as curing agents and accelerators for fabricating crosslinked epoxy materials applied in electrical and electronic ***,the intrinsic chemical structure of imidazole derivatives would greatly influence the polymerisation process,and further change the electrical properties,which was not *** achieve an in-depth understanding,commonly used imidazole only containing pyridine-type nitrogen and imidazole with both pyridine and pyrrole-type nitrogen were selected in this *** properties including dielectric properties,volume resistivity,breakdown strength,and especially energy storage performances were systematically *** figured out that higher breakdown strength,glass transition temperature,and lower dielectric loss can be achieved with imidazole containing pyrrole-type ***-induced curing mechanism diversity and the generated differences in polymer network were *** the capability to incorporate into the polymer network,the dielectric constant/loss of epoxy cured by imidazole containing pyrrole-type nitrogen is less sensitive with variation in concentration and a high breakdown strength of 577.9 MV/m was *** the contrary,conspicuous decrease in the breakdown strength and increase in dielectric loss of the epoxy cured by imidazole only containing pyridine-type nitrogen were observed,especially at high ***,we also found that the epoxy can be fabricated into films with an attractive energy storage density/efficiency of 1.1 J/cm^(3)/97%@200 MV/m,which is twice of the commercial dielectric polypropylene film under the same electric field.

关键词： field. dielectric imidazole

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珠三角地区生态文明建设成效评估研究

生态经济 2024年第4期40卷 213-219页

作者：张修玉滕飞达庄长伟孔玲玲郑子琪韩瑜关晓彤曹君谢紫霞马秀玲胡习邦田岱雯侯青青代雪娇陈星宇姚一博广东省环境科学研究院广东广州510650

生态文明建设是国家“五位一体”总体布局的重要组成部分,是关系人民福祉、关乎民族未来的长远大计。珠三角地区作为我国高质量发展区域之一,需要高度重视生态文明建设。鉴于此,论文以2015年为基准年、2020年为目标年,基于国家生态文明... 详细信息

生态文明建设是国家“五位一体”总体布局的重要组成部分,是关系人民福祉、关乎民族未来的长远大计。珠三角地区作为我国高质量发展区域之一,需要高度重视生态文明建设。鉴于此,论文以2015年为基准年、2020年为目标年,基于国家生态文明建设的总体要求、目标和任务,围绕生态制度、生态安全、生态空间、生态经济、生态生活、生态文化六大领域,综合评估2020年珠三角地区生态文明建设成效,深入剖析各地区生态文明建设成果与短板,为2025年前珠三角地区分阶段完成“国家生态文明建设示范区”创建工作提供科学支撑。结果表明:(1)2020年珠三角地区生态文明整体发展状况良好。(2)生态制度分领域成效较为突出,但生态空间和生态经济领域不平衡较为突出,短板明显。(3)深圳市、珠海市、惠州市生态文明建设处于上游水平,并且相比之下,深圳市在六大领域建设的平衡度较高。

关键词：珠三角地区生态文明建设成效评估

Design and evaluation of a novel biopsy needle with hemostatic function

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机械工程前沿:英文版 2023年第2期18卷 319-331页

作者： Xiaolong ZHU Yichi MA Xiao XIAO Liang LU Wei XIAO ziqi ZHAO Hongliang REN Max Q.-H.MENG Department of Electronic and Electrical Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Mechanical Engineering University of CaliforniaBerkeleyBerkeleyCA 48072USA Department of Electronic Engineering The Chinese University of Hong KongHong KongChina

Biopsy is a method commonly used for early cancer ***,bleeding complications of widely available biopsy are risky for *** biopsy will result in a more accurate cancer diagnosis and a decrease in the risk of *** this article,we propose a novel biopsy needle that can reduce bleeding during biopsy procedures and achieve stable *** proposed biopsy needle features a compact structure and can be operated easily by left and right hands.A predictive model for puncture force and tip deflection based on coupled Eulerian–Lagrangian(CEL)method is *** results show that the biopsy needle can smoothly deliver the gelatin sponge hemostatic plug into the *** the hemostatic plug bends,the overall delivery process is stable,and the hemostatic plug retains in the tissue without being affected by the withdrawal of the *** experiments indicate that the specimens are well obtained and evenly distributed in the groove of the outer needle without *** proposed design of biopsy needle possesses strong ability of hemostasis,tissue cutting,and tissue *** CEL model accurately predicts the peak of puncture force and produces close estimation of the insertion force at the postpuncture stage and tip position.

关键词： cancer diagnosis biopsy needle hemostatic function predictive model coupled Eulerian−Lagrangian

Manufacturing of graphene based synaptic devices for optoelectronic applications

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International Journal of Extreme Manufacturing 2023年第4期5卷 150-177页

作者： Kui Zhou ziqi Jia Xin-Qi Ma Wenbiao Niu Yao Zhou Ning Huang Guanglong Ding Yan Yan Su-Ting Han Vellaisamy A L Roy Ye Zhou Institute for Advanced Study Shenzhen UniversityShenzhen 518060People’s Republic of China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China School of Science and Technology Hong Kong Metropolitan UniversityHong Kong Special Administrative Region of ChinaPeople’s Republic of China James Watt School of Engineering University of GlasgowGlasgow G128QQUnited Kingdom

Neuromorphic computing systems can perform memory and computing tasks in parallel on artificial synaptic devices through simulating synaptic functions,which is promising for breaking the conventional von Neumann bottlenecks at hardware *** optoelectronic synapses enable the synergistic coupling between optical and electrical signals in synaptic modulation,which opens up an innovative path for effective neuromorphic *** the advantages of high mobility,optical transparency,ultrawideband tunability,and environmental stability,graphene has attracted tremendous interest for electronic and optoelectronic *** progress highlights the significance of implementing graphene into artificial synaptic ***,to better understand the potential of graphene-based synaptic devices,the fabrication technologies of graphene are first ***,the roles of graphene in various synaptic devices are ***,their typical optoelectronic applications in neuromorphic systems are ***,outlooks for development of synaptic devices based on graphene are *** review will provide a comprehensive understanding of graphene fabrication technologies and graphene-based synaptic device for optoelectronic applications,also present an outlook for development of graphene-based synaptic device in future neuromorphic systems.

关键词： graphene synaptic device memristor optoelectronic applications

Concurrent silencing of TBCE and drug delivery to overcome platinum-based resistance in liver cancer

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Acta Pharmaceutica Sinica B 2023年第3期13卷 967-981页

作者： Senlin Li Siyu Chen Zhihui Dong Xingdong Song Xiuling Li ziqi Huang Huiru Li Linzhuo Huang Ganyuan Zhuang Ran Lan Mingyan Guo Wende Li Phei Er Saw Lei Zhang Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation Guangdong-Hong Kong Joint Laboratory for RNA MedicineSun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhou510120China Department of Hepatobiliary Surgery Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhou 510120China Guangdong Laboratory Animals Monitoring Institute Guangdong Key Laboratory of Laboratory AnimalsGuangzhou510663China Department of Anesthesiology Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhou510120China

Platinum-based chemotherapy resistance is a key factor of poor prognosis and recurrence in hepatocellular carcinoma(HCC).Herein,RNAseq analysis revealed that elevated tubulin folding cofactor E(TBCE)expression is associated with platinum-based chemotherapy *** expression of TBCE contributes to worse prognoses and earlier recurrence among liver cancer ***,TBCE silencing significantly affects cytoskeleton rearrangement,which in turn increases cisplatin-induced cycle arrest and *** develop these findings into potential therapeutic drugs,endosomal pH-responsive nanoparticles(NPs)were developed to simultaneously encapsulate TBCE siRNA and cisplatin(DDP)to reverse this ***(siTBCE+DDP)concurrently silenced TBCE expression,increased cell sensitivity to platinum treatment,and subsequently resulted in superior anti-tumor effects both in vitro and in vivo in orthotopic and patient-derived xenograft(PDX)*** together,NP-mediated delivery and the co-treatment of siTBCE+DDP proved to be effective in reversing chemotherapy resistance of DDP in multiple tumor models.

关键词： Hepatocellular carcinoma Tubulin folding cofactor E Chemoresistance siRNA delivery RNA interference Nanoparticle Combination therapy Nanomedicine

High-sensitivity, high-spatial-resolution distributed strain sensing based on a poly(methyl methacrylate) chirped fiber Bragg grating

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Photonics Research 2020年第7期8卷 1134-1139页

作者： Chengang Lyu ziqi Liu ziqiang Huo Chunfeng Ge Xin Cheng Haw-Yaw Tam School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China School of Precision Instruments and Opto-electronics Engineering Tianjin UniversityTianjin 300072China Photonics Research Center The Hong Kong Polytechnic UniversityKowloonHong KongChina

In this study,a high-sensitivity,high-spatial-resolution distributed strain-sensing approach based on a poly(methyl methacrylate)chirped fiber Bragg grating(CFBG)is proposed and experimentally *** chirped FBGs in a polymer optical fiber provide an alternative to the silica fiber owing to the lower Young’s modulus,which can yield a higher stress sensitivity under the same external *** to the spatial wavelength-encoded characteristic of the CFBG,a fully distributed strain measurement can be achieved by optical frequency-domain *** time-/space-resolved short-time Fourier transform,the applied force can be located by the beat frequency originated from the space-induced time delay and measured by the differential frequency offset originated from the strain-induced dispersion time *** a proof-of-concept experiment,a high spatial resolution of 1 mm over a gauge length of 40 mm and a strain resolution of 0.491 Hz/μεwere achieved.

关键词： offset fiber resolution