检索结果-南通市图书馆

Nano Research 2024年第8期17卷 7020-7026页

作者： Jinhua He Chenhui Wang Mingrui Liu Muhammad Ramzan Zhiwei Long xian-gang Wu Yu Chen Haizheng Zhong MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Engineering Research Center for Mixed Reality and Advanced Display Technology School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

The potential use of large-size ZnSe quantum dots as blue emitters for display applications has greatly inspired the colloidal ***,we report the negative effects of side reactions of large-size ZnSe quantum *** side reactions between oleic acid and oleylamine generated amidation products and H_(2)O,which led to the hydrolysis of Zn(OA)2 to Zn(OH)2 and the subsequent formation of zinc oxide(ZnO)and zinc bis[diphenylphosphinate](Zn(DPPA)2)*** side reactions resulted in the formation of a defective surface including a Se-rich surface and oxygen-related *** negative effects can be overcome by adopting an etching strategy using potassium fluoride and myristic acid in *** overcoating a ZnS shell,blue emissive ZnSe/ZnS quantum dots with a maximum photoluminescence quantum yield of up to 91%were *** further fabricated ZnSe quantum dots-based blue light-emitting diodes with an emission peak at 456 *** device showed a turn-on voltage of 2.7 V with a maximum external quantum efficiency of 4.2%and a maximum luminance of 1223 cd·m^(−2).

关键词： quantum dots ZnSe side reactions surface etching light-emitting diodes

Differences and identification on multi-time hydrocarbon generation of carboniferous-permian coaly source rocks in the Huanghua Depression,Bohai Bay Basin

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2024年第2期21卷 765-776页

作者： Jin-Jun Xu xian-gang Cheng Shu-Nan Peng Jun-Cai Jiang Qi-Long Wu Da Lou Fu-Qi Cheng La-Mei Lin National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580ShandongChina PetroChina Dagang Oilfield Company Tianjin300280China

Coal is a solid combustible mineral,and coal-bearing strata have important hydrocarbon generation potential and contribute to more than 12%of the global hydrocarbon ***,the deposition and hydrocarbon evolution process of ancient coal-bearing strata is characterized by multiple geological times,leading to obvious distinctions in their hydrocarbon generation potential,geological processes,and production,which affect the evaluation and exploration of hydrocarbon resources derived from coaly source rocks *** study aimed to identify the differences on oil-generated parent macerals and the production of oil generated from different coaly source rocks and through different oil generation *** with the analysis of previous tectonic burial history and hydrocarbon generation history,high-temperature and high-pressure thermal simulation experiments,organic geochemistry,and organic petrology were performed on the Carboniferous-Permian(C-P)coaly source rocks in the Huanghua Depression,Bohai Bay *** oil-generated parent macerals of coal's secondary oil generation process(SOGP)were mainly hydrogen-rich collotelinite,collodetrinite,sporinite,and cutinite,while the oil-generated parent macerals of tertiary oil generation process(TOGP)were the remaining small amount of hydrogen-rich collotelinite,sporinite,and cutinite,as well as dispersed soluble organic matter and unexhausted residual *** with coal,the oil-generated parent macerals of coaly shale SOGP were mostly sporinite and *** part of hydrogen-poor vitrinite,lacking hydrocarbon-rich macerals,and macerals of the TOGP,in addition to some remaining cutinite and a small amount of crude oil and bitumen from SOGP contributed to the oil *** results indicated that the changes in oil yield had a good junction between SOGP and TOGP,both coal and coaly shale had higher SOGP aborted oil yield than TOGP starting yield,and coaly shale TOGP peak oil yield was low

关键词： Thermal simulation Multi-time oil generation processes Coaly source rock Carboniferous-permian Huanghua Depression

Revealing the vertical structure of in-situ fabricated perovskite nanocrystals films toward efficient pure red light-emitting diodes

在线全文

学校读者我要写书评

暂无评论

Fundamental Research 2024年第2期4卷 362-368页

作者： xian-gang Wu Shipei Sun Tinglu Song Xin Zhang Chenhui Wang Yingguo Yang Shuangpeng Wang Haizheng Zhong MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China Experimental Center of Advanced Materials School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China Shanghai Synchrotron Radiation Facility(SSRF) Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Institute of Applied Physics and Materials Engineering University of MacaoMacao 999078China

The development of efficient perovskite light-emitting diodes(PeLEDs)relies strongly on the fabrication of perovskite films with rationally designed structures(grain size,composition,surface,etc.).Therefore,an understanding of structure-performance relationships is of vital importance for developing high-performance perovskite devices,particularly for devices with in-situ fabricated perovskite nanocrystal *** this study,we reveal the vertical structure of an in-situ fabricated quasi-two-dimensional perovskite *** combining time-of-flight secondary ion mass spectrometry,energy dispersive spectroscopy,grazing incidence wide-angle X-ray scattering(GIWAXS),and low-temperature photoluminescence spectra,we illustrate that the resulting in-situ fabricated DPPA_(2)Cs_(n-1)Pb_(n)(Br_(0.3)I_(0.7))_(3n+1)(DPPA^(+):3,3-diphenylpropylammonium)film has a gradient structure with a very thin layer of ligands on the surface,predominantly small-n domains at the top,and predominantly large-n domains at the bottom owing to the solubility difference of the *** addition,GIWAXS measurements show that the domain of n=2 on the top layer has an ordered in-plane *** on the understanding of the film structure,we developed an in-situ fabrication process with ligand exchange to achieve efficient pure red PeLEDs at 638 nm with an average external quantum efficiency(EQE)of 7.4%.The optimized device had a maximum luminance of 623 cd/m^(2) with a peak EQE of 9.7%.

关键词： Light-emitting diodes Perovskite TOF-SIMS Vertical structure in-situ fabrication

Plasmon-enhanced ultra-high photoresponse of single-wall carbon nanotube/copper/silicon near-infrared photodetectors

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第7期17卷 5930-5936页

作者： Yi-Ming Zhao xian-gang Hu Chao Chen Zuo-Hua Wang An-Ping Wu Hong-Wang Zhang Peng-xiang Hou Chang Liu Hui-Ming Cheng Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Single wall carbon nanotube(SWCNT)/Si heterojunction photodetectors have the advantages of high photoresponse ability and simple structure,however,their detection wavelength range are usually lower than 1100 nm,which limits their application in the infrared *** report a SWCNT/Cu/Si photodetector with both a high photoresponse and a detection range up to the infrared band by depositing a Cu nanoparticles(NPs)layer between a SWCNT film and a n-Si *** was found that the Cu NPs produce strong surface plasmon resonance(SPR)under laser irradiation,which breaks through the limitation of Si band gap and greatly improves the photoresponse of the SWCNT/Cu/Si photodetector in the near infrared *** responsivity(R)of the photodetector in the wavelength range of 1850–1200 nm reached 2.2–14.15 mA/W,which is the highest value in the reported plasmon enhanced n-Si based photodetectors,and about 20,000 times higher than that of a SWCNT/Si *** R value for 1550 nm wavelength used in optical communications reached~8.2 mA/W,which is 64%higher than the previously reported values of commonly used *** attribute the significant increase to the strong SPR and low Schottky barrier of Cu with n-Si,which facilitates the generation and transfer of the carriers.

关键词： single wall carbon nanotube photodetector silicon surface plasmon resonance copper

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

谢林与黑格尔艺术哲学中的“象征”之争

中山大学学报（社会科学版） 2024年第1期64卷 151-159页

作者：先刚北京大学外国哲学研究所北京100871 北京大学美学与美育研究中心北京100871

“象征”(Symbol)是谢林与黑格尔的艺术哲学的关键概念之一。这个概念原本是指两个东西的合体或一致,然后被康德决定性地诠释为理念与感性事物这两种不同性质的东西的结合。谢林与黑格尔随后突破了康德对于这个概念的限制,将其应用于各... 详细信息

“象征”(Symbol)是谢林与黑格尔的艺术哲学的关键概念之一。这个概念原本是指两个东西的合体或一致,然后被康德决定性地诠释为理念与感性事物这两种不同性质的东西的结合。谢林与黑格尔随后突破了康德对于这个概念的限制,将其应用于各自的艺术哲学,但在这个过程中,两位哲学家对于“象征”的不同理解和定位展示出了他们的艺术哲学思想乃至哲学体系本身的差异性,即黑格尔哲学总体说来是单向度的、西方中心式的,仅仅把片面的理性思想发展当作一切的准绳,反之谢林哲学是多维度的,对远古的和非西方的文明有着更深刻的认识并给予更多的承认。

关键词：艺术哲学象征古典建构体系

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

谢林与康德论有机体的偶然性

山西大学学报(哲学社会科学版) 2024年第2期47卷 19-26页

作者：常文琦先刚北京大学哲学系

康德和谢林对有机体有着类似的刻画，有机体的偶然性特征使他们面临类似的二律背反。康德和谢林对有机体的偶然性给出了不同的处理方案，这使得他们的有机体理论最终呈现出不同的面貌：康德为消除偶然性为有机体找到的目的论原则必然会... 详细信息

康德和谢林对有机体有着类似的刻画，有机体的偶然性特征使他们面临类似的二律背反。康德和谢林对有机体的偶然性给出了不同的处理方案，这使得他们的有机体理论最终呈现出不同的面貌：康德为消除偶然性为有机体找到的目的论原则必然会与机械论原则陷入冲突，而其采取的“目的-手段”式的统一方案无法实现二者的真正统一；谢林为保证偶然性而赋予有机体的独特的肯定性本原与代表必然性的否定性本原同样会构成冲突，但谢林通过维持这个冲突的方式来化解冲突，不仅捍卫了有机体的偶然性特征，而且保证了整个有机世界内部的发展进程，实现了相互冲突的本原之间真正意义上的统一。

关键词：谢林康德有机体偶然性

Permeability measurement of the fracture-matrix system with 3D embedded discrete fracture model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2022年第4期19卷 1757-1765页

作者： Bao Jia Cheng-gang xian State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Bejing)Beijing 102249China Unconventional Petroleum Research Institute China University of Petroleum(Bejing)Bejing 102249China

In this work, we performed the pulse-decay experiment on a fractured shale core and applied the 3 D embedded discrete fracture model(EDFM) to simulate the experiment process. The irregularly rough fracture surface was depicted in detail using a 3 D scanner. Then the fracture surface profile was imported in the discrete fracture network model to simulate the flow process in the fracture-matrix system realistically. History matching was efficiently performed to simultaneously obtain porosity and permeability for the matrix and fracture. Gas properties after applying nanopore confinement were obtained by modifying Sutton's viscosity correlation with sensitivity analysis on the pore diameter ranging from 2 to50 nm. Nanopore confinement results in low matched permeability due to viscosity reduction in the matrix-only porous media. The fracture-matrix system complicates the interpretation of nanopore confinement impact on flow behavior in shale reservoirs. Different scenarios of the highly fractured and matrix-dominated systems were discussed in detail by constructing the digital twin model.

关键词： Permeability Fracture Pulse-decay Shale Viscosity

基于微震多参数的大规模岩体垮塌前兆特征研究

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2024年第3期31卷 878-889页

作者：柳建新杨顺李磊潘新朋尹贤刚胡静云彭府华 Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University) Ministry of EducationChangsha 410083China Hunan Key Laboratory of Nonferrous Resources and Geological Hazard Exploration Changsha 410083China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China Changsha Institute of Mining Research Co. Ltd.Changsha 410012China

微震监测技术能进行工程岩体失稳垮塌前兆特征的辨识和分析,对于地质灾害预警防控具有重要意义。本文基于已有室内岩石受压损伤破坏声发射实验规律,通过开展现场微震多参数定量分析,探究了柿竹园矿山6·21大爆破诱发山体滑移垮塌的前兆... 详细信息

微震监测技术能进行工程岩体失稳垮塌前兆特征的辨识和分析,对于地质灾害预警防控具有重要意义。本文基于已有室内岩石受压损伤破坏声发射实验规律,通过开展现场微震多参数定量分析,探究了柿竹园矿山6·21大爆破诱发山体滑移垮塌的前兆特征。大爆破诱发微震事件的b值和空间分形维数表现出下降趋势,b值急剧下降和分形维数降到最低可作为工程岩体失稳垮塌的前兆特征。此外,能量指数和累计视体积的变化可以分别表征应力和应变的变化。能量指数快速下降和累计视体积持续增加的组合特征反映了岩体的失稳状态。经过多个失稳破坏阶段后岩体发生最终的失稳垮塌。该案例表明微震监测能为工程岩体失稳垮塌的预警和防控提供重要信息,也为涉及爆破作业的诸多地质工程活动的安全监测提供了参考。

关键词：微震监测岩体垮塌前兆特征预警

融合成矿过程数值模拟信息的三维成矿预测方法研究:以安徽宣城茶亭地区为例

在线全文

学校读者我要写书评

暂无评论

矿物岩石地球化学通报 2024年第2期43卷 446-458页

作者：谢先岗李晓晖袁峰叶胜飞陈宇恒合肥工业大学资源与环境工程学院合肥230009

茶亭地区位于长江中下游成矿带南陵-宣城矿集区东北部,近年来陆续发现了多个斑岩型和矽卡岩型矿床,显示深部具有很好的热液矿床成矿潜力。目前传统的矿产勘查方法对区内隐伏矿的勘查效果不佳,制约了进一步的找矿突破。三维成矿预测是近... 详细信息

茶亭地区位于长江中下游成矿带南陵-宣城矿集区东北部,近年来陆续发现了多个斑岩型和矽卡岩型矿床,显示深部具有很好的热液矿床成矿潜力。目前传统的矿产勘查方法对区内隐伏矿的勘查效果不佳,制约了进一步的找矿突破。三维成矿预测是近年来隐伏矿找矿的重要手段之一,但三维预测信息的缺乏在一定程度上制约了该方法的预测效果。三维成矿过程数值模拟方法能为三维成矿预测方法提供新的预测信息,但对多元数值模拟信息的联合应用以及对三维成矿预测方法的支持能力等均有待深入研究。本文以安徽宣城茶亭地区为例,在力-热-流多场耦合的条件下对热液成矿过程进行三维数值模拟;通过将体应变增量、剪切应变增量等数值模拟变量信息与其他预测信息进行融合,实现深部找矿靶区的圈定。结果显示,成矿过程数值模拟方法可为三维成矿预测提供有效的预测信息,能显著提高预测能力;圈定的找矿靶区可为进一步的深部找矿勘查提供更为有效和可靠的线索和方向。

关键词：三维成矿预测成矿过程数值模拟茶亭地区

基于变权与区间数-集对分析理论的电缆中间接头状态评估

在线全文

学校读者我要写书评

暂无评论

广东工业大学学报 2024年第5期41卷 30-38页

作者：陈嘉杨彭显刚广东工业大学自动化学院广东广州510006

针对电缆接头状态信息以及评估等级边界的动态性和随机性问题,提出基于变权与区间数-集对分析理论的电缆中间接头绝缘状态评估方法。提取电缆接头局部放电特征参数作为状态评估指标,并对指标数据进行区间表示。引入方差和标准差来衡量... 详细信息

针对电缆接头状态信息以及评估等级边界的动态性和随机性问题,提出基于变权与区间数-集对分析理论的电缆中间接头绝缘状态评估方法。提取电缆接头局部放电特征参数作为状态评估指标,并对指标数据进行区间表示。引入方差和标准差来衡量指标区间数据的波动性,进而赋予指标的客观权重;对于局部放电指标劣化不均衡的问题,综合考虑指标的劣化程度与趋势参数,构建相应的状态变权函数从而得到变权权重。最后应用区间数与集对分析耦合方法,依据最大综合联系期望值确定电缆接头的状态等级。通过对某地10 kV电缆中间接头的在线监测数据进行算例分析,验证了该状态评估方法的有效性和可行性。

关键词：电缆接头区间数集对分析变权状态评估