检索结果-南通市图书馆

High-performance broadband photodetector based on PtSe2/MoS2 heterojunction from visible to near-infrared region

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第3期67卷 263-270页

作者： Bin WANG Jian YUAN Mengqi CHE Mingxiu LIU yuting ZOU Junru AN Fan TAN Yaru SHI Nan ZHANG Liujian QI Shaojuan LI State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences School of Physics and Electronic Information Huaibei Normal University

Broadband photodetectors based on narrow bandgap 2D materials have garnered considerable interest for application in the field of optoelectronic devices. However, their large dark current hinders device performance. In this work, a PtSe2/MoS2heterojunction was fabricated for a broadband photodetector operating within the range of visible to near-infrared. The device exhibited suppressed dark currents with a high rectification ratio of 104. The built-in electric field of the heterojunction promoted carrier separation effectively, and the device achieved excellent photoelectric performance with responsivities of 1.7 × 103,27.52, and 21 ma/W at 635, 785, and 1550 nm wavelengths, respectively. Moreover, the specific detectivities(D*) were 2.2 × 1013Jones(635 nm), 3.55 × 1011Jones(785 nm), and 2.72 × 108Jones(1550 nm). The device demonstrated a rise/fall time of 131/241 μs under 1550 nm laser illumination. Visible and near-infrared imaging detection was also demonstrated based on the heterojunction device at room temperature. This work sheds light on the remarkable potential of PtSe2/MoS2heterojunctions in the domain of high-performance broadband photodetectors.

关键词： photodetector PtSe$_{2}$/MoS$_{2}$ heterojunction visible to near infrared high performance

3D simulation of image-defined complex internal features using the numerical manifold method

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2024年第4期67卷 1023-1039页

作者： WU Jie ma GuoWei School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China Tianjin Key Laboratory for Prefabricated Building and Intelligent Construction Tianjin 300401China

The numerical simulation of internal features,such as inclusions and voids,is important to analyze their impact on the performance of composite ***,the complex geometries of internal features and the induced continuous-discontinuous(C-D)deformation fields are challenges to their numerical *** this study,a 3D approach using a simple mesh to simulate irregular internal geometries is developed for the first *** the help of a developed voxel crack model,image models that are efficient when recording complex geometries are directly imported into the *** reconstructions,which are usually labor-intensive,are excluded from this ***,using image models as the geometric input,image processing techniques are applied to detect material interfaces and develop contact ***,the C-D deformations of the complex internal features are directly calculated based on the numerical manifold *** accuracy and convergence of the developed3D approach are examined based on multiple *** 3D C-D simulation of sandstones with naturally formed complex microfeatures demonstrates the capability of the developed approach.

关键词： 3D continuous-discontinuous simulation image-based simulation complex internal features numerical manifold method voxel crack model structured mesh

农户过量施用农药的测算与影响因素分析——基于中国苏皖地区农户的调查数据

在线全文

学校读者我要写书评

暂无评论

中国食品安全治理评论 2018年第2期 30-52,219页

作者：马玉婷武汉大学经济发展研究中心武汉大学经济与管理学院

本文以中国江苏省、安徽省861个水稻种植农户为样本,引入C-D生产函数(Cobb-Douglas Production Function)与威布尔(Weibull)分布的损害控制模型(Damage Control Model),估算了水稻种植农户农药施用的边际生产率,在判断农药施用是否过量... 详细信息

本文以中国江苏省、安徽省861个水稻种植农户为样本,引入C-D生产函数(Cobb-Douglas Production Function)与威布尔(Weibull)分布的损害控制模型(Damage Control Model),估算了水稻种植农户农药施用的边际生产率,在判断农药施用是否过量的基础上,利用ML-Binary Logit模型分析了影响农户过量施用农药的主要因素。C-D生产函数和Weibull分布的损害控制模型的估计结果均显示,农药施用的边际生产率接近0,表明调查地区水稻种植农户农药施用过量。对农户过量施用农药影响因素的分析结果表明:对农药的毒性具有一定认知、认为经常或大量地施用农药会造成农作物农药残留、认为大量施用农药对周围环境有危害的农户过量施用农药的可能性较高;知道《农药合理使用准则》、务农年限较长的农户过量施用农药的可能性较低。农户过量施用农药的可能原因是损失厌恶,且农户对过量施用农药所增加的农药投入不敏感。

关键词：农药施用行为边际生产率水稻种植 C-D生产函数模型损害控制模型

Enhancing capacitive deionization performance and cyclic stability of nitrogen-doped activated carbon by the electro-oxidation of anode materials

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第5期69卷 23-33页

作者： Xiaona Liu Baohua Zhao Yanyun Hu Luyue Huang Jingxiang ma Shuqiao Xu Zhonglin Xia Xiaoying ma Shuangchen ma School of Environmental Science and Engineering North China Electric Power UniversityBaoding 071003China Huadian Zhengzhou machinery Design and Research Institute Co. LtdZhengzhou 450002China Huadian Inner Mongolia Energy Co. Ltd.Baotou Power Generation BranchBaotou 014013China

Electrode materials with high desalination capacity and long-term cyclic stability are the focus of capacitive deionization(CDI) community. Understanding the causes of performance decay in traditional carbons is crucial to design a high-performance material. Based on this, here, nitrogen-doped activated carbon(NAC) was prepared by pyrolyzing the blend of activated carbon powder(ACP) and melamine for the positive electrode of asymmetric CDI. By comparing the indicators changes such as conductivity, salt adsorption capacity, pH, and charge efficiency of the symmetrical ACP-ACP device to the asymmetric ACP-NAC device under different CDI cycles, as well as the changes of the electrochemical properties of anode and cathode materials after long-term operation, the reasons for the decline of the stability of the CDI performance were revealed. It was found that the carboxyl functional groups generated by the electro-oxidation of anode carbon materials make the anode zero-charge potential(E_(pzc)) shift positively,which results in the uneven distribution of potential windows of CDI units and affects the adsorption capacity. Furthermore, by understanding the electron density on C atoms surrounding the N atoms, we attribute the increased cyclic stability to the enhanced negativity of the charge of carbon atoms adjacent to quaternary-N and pyridinic-oxide-N.

关键词： Anodic oxidation Capacitive deionization Cyclic stability N-doping

在线全文

学校读者我要写书评

暂无评论

中国当代传媒与司法的关系研究

和田师范专科学校学报 2018年第4期37卷 88-93页

作者：马玉婷安徽大学法学院安徽合肥230601

在我国,司法独立与新闻自由是宪法的原则之一,新闻自由体现了民主政治,而司法独立则标志着法治国家,二者都以维护社会的公平正义为目标,都在建设和谐社会中发挥着不可替代的作用。但两者在其运作的程序、方法、途径等方面有显著差异,不... 详细信息

在我国,司法独立与新闻自由是宪法的原则之一,新闻自由体现了民主政治,而司法独立则标志着法治国家,二者都以维护社会的公平正义为目标,都在建设和谐社会中发挥着不可替代的作用。但两者在其运作的程序、方法、途径等方面有显著差异,不可避免的会产生一系列错综复杂的矛盾纠纷。司法独立是相对的,传媒自由也不是绝对的,其权利的行使的前提是履行义务,这样才能充分发挥各自的优势。两者的关系的协调与平衡,是一个动态的不断调整的过程,需要结合具体国情做出与时俱进的决策,尽快出台相关方面的法律法规,使传媒监督和司法能够处于和谐的状态,营造一种适合两者良好发展的氛围。

关键词：司法制度传播媒体辩证关系

从罗丹到布朗库西——关于材料在雕塑中的现代化角色转变

在线全文

学校读者我要写书评

暂无评论

浙江艺术职业学院学报 2017年第4期15卷 41-48页

作者：马玉婷中国人民大学艺术学院

当我们讨论雕塑的现代性问题时,材料在作品中的作用,无疑是判断一件雕塑是否具有现代性的重要指针之一。罗丹善于运用粘土,亲手捏制,整个过程中,作品触感的强度完全由雕塑家本人控制,塑造过程中形成了作品表面的确实感,也就是粘土作为... 详细信息

当我们讨论雕塑的现代性问题时,材料在作品中的作用,无疑是判断一件雕塑是否具有现代性的重要指针之一。罗丹善于运用粘土,亲手捏制,整个过程中,作品触感的强度完全由雕塑家本人控制,塑造过程中形成了作品表面的确实感,也就是粘土作为媒介可感知的物质性,粘土不再单纯作为造型的工具,而是作为一种真实的材料,正式登上造型艺术的舞台。粘土作为原材料将作品结构独立于传统的雕塑人像,成为人像的雕塑,而不只是雕塑的人像,这是罗丹对于现代雕塑最本质的贡献。彻底终结了自米开朗基罗以来,雕塑家的个人视角与媒材之间无法进行本质上沟通的矛盾。使制作的过程重新回到雕塑家手中,将雕塑从19世纪"僵化、虚假、舒适"的困境中拯救出来,带入现代雕塑的新阶段。布朗库西洞见到罗丹雕塑的核心即在于形式与材料的关系,他比罗丹更进一步地直接面对材料,用思考的双手去发现材料的思想,明确形式由材料来决定的创作思想,赋予雕塑完整、独立的"物"的本质,对之后现当代雕塑的发展产生了深远的影响。

关键词：罗丹布朗库西现代雕塑材料物性

CoDetect: cooperative anomaly detection with privacy protection towards UAV swarm

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第5期67卷 325-326页

作者： Teng LI Weiguo LIN Ruichen ma Zhuo ma Yulong SHEN Jianfeng ma School of Cyber Engineering Xidian University School of Computer Science and Technology Xidian University

As mission scenarios grow more complex, the role of a single unmanned aerial vehicle(UAV) is limited. The UAV swarm,surpassing the single UAV, dynamically establishes temporary communication networks, ensuring high transmission rates and expansive communication coverage [1]. Unlike a single UAV, a swarm faces increased security risks, requiring specific capabilities.(1) Anomalies detection.

关键词： Unmanned aerial vehicles (UAV)

A combined Liouville integrable hierarchy associated with a fourth-order matrix spectral problem

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第7期76卷 1-8页

作者： Wen-Xiu ma Department of mathematics Zhejiang Normal UniversityJinhua 321004China Department of mathematics King Abdulaziz UniversityJeddah 21589Saudi Arabia Department of mathematics and Statistics University of South Florida TampaFL 33620-5700United States of America material Science Innovation and Modelling Department of Mathematical SciencesNorth-West UniversityMafikeng CampusMmabatho 2735South Africa

This paper aims to propose a fourth-order matrix spectral problem involving four potentials and generate an associated Liouville integrable hierarchy via the zero curvature formulation.A bi-Hamiltonian formulation is furnished by applying the trace identity and a recursion operator is explicitly worked out,which exhibits the Liouville integrability of each model in the resulting *** specific examples,consisting of novel generalized combined nonlinear Schrodinger equations and modified Korteweg-de Vries equations,are given.

关键词： integrable hierarchy Hamiltonian structure zero curvature equation Lax pair matrix spectral problem

Effect of heat treatment on the microstructure,mechanical properties and fracture behaviors of ultra-high-strength SiC/Al-Zn-Mg-Cu composites

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and materials 2024年第10期31卷 2233-2243页

作者： Guonan ma Shize Zhu Dong Wang Peng Xue BolüXiao Zongyi ma Shi-changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Centre of Excellence for Advanced materials Dongguan 523808China

A high-zinc composite,12vol%SiC/Al-13.3 Zn-3.27 Mg-1.07Cu(wt%),with an ultra-high-strength of 781 MPa was success-fully fabricated through a powder metallurgy method,followed by an extrusion *** effects of solid-solution and aging heat treat-ments on the microstructure and mechanical properties of the composite were extensively *** with a single-stage sol-id-solution treatment,a two-stage solid-solution treatment(470℃/1 h+480℃/1 h)exhibited a more effective solid-solution strengthen-ing owing to the higher degree of solid-solution and a more uniform *** to the aging hardness curves of the com-posite,the optimized aging parameter(100℃/22 h)was *** the aging temperature and time resulted in finer and more uniform nanoscale precipitates but only yielded a marginal increase in tensile *** fractography analysis revealed that intergranu-lar cracking and interface debonding were the main fracture mechanisms in the ultra-high-strength SiC/Al-Zn-Mg-Cu *** regions,such as the SiC/Al interface containing numerous compounds and the precipitate-free zones at the high-angle grain boundaries,were identified as significant factors limiting the strength enhancement of the *** compounds,including MgO,MgZn2,and Cu5Zn8,reduced the interfacial bonding strength,leading to interfacial debonding.

关键词： metal matrix composites heat treatment interfacial reaction mechanical properties fracture mechanism