检索结果-南通市图书馆

A general climatology of categorized Martian ionospheric irregularities

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2024年第10期67卷 3302-3325页

作者： Xin wan Jiahao ZHONG Yongqiang HAO Chao XIONG Hui wanG Yutian CAO jun CUI Yiwen liu Qiaoling LI Jiawei KUAI Planetary Environmental and Astrobiological Research laboratory(PEARL) School of Atmospheric SciencesSun Yat-sen UniversityZhuhai 519082China Key laboratory of Tropical Atmosphere-Ocean System Ministry of EducationZhuhai 519082China department of Space physics College of Electronic InformationLuojia LaboratoryWuhan UniversityWuhan 430079China School of physics and Electronic Information Shangrao Normal UniversityShangrao 334001China School of Petroleum China University of Petroleum-Beijing at KaramayKaramay 834000China College of Astronautics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

A climatological survey of Martian ionospheric plasma density irregularities was conducted by exploring the in-situ measurements of the Mars Atmosphere and Volatile EvolutioN(MAVEN) spacecraft. The irregularities were first classified as enhancement, depletion, and oscillation. By checking the simultaneous magnetic field fluctuation, the irregularities have been classified into two types: with or without magnetic signatures. The classified irregularities exhibit diverse global occurrence patterns, as those with magnetic signatures tend to appear near the periphery of the crustal magnetic anomaly(MA), and those without magnetic signatures prefer to appear either inside of the MA or outside of the MA, depending on the type and solar zenith angle. Under most circumstances, the irregularities have a considerable occurrence rate at altitudes above the ionospheric dynamo height(above 200 km), and the magnetization state of the ions seems irrelevant to their occurrence. In addition, the irregularities do not show dependence on magnetic field geometry, except that the enhancement without magnetic signatures favors the vertical field line, implying its equivalence to the localized bulge. Other similarities and discrepancies exist in reference to previous studies. We believe this global survey complements previous research and provides crucial research clues for future efforts to clarify the nature of the Martian ionospheric irregularities.

关键词： Mars MAVEN Ionosphere Ionospheric irregularities Crustal magnetic anomaly Plasma

GaAs(001)衬底上分子束外延生长立方和六方GaN薄膜

在线全文

学校读者我要写书评

暂无评论

物理学报 2000年第6期49卷 1132-1135页

作者：刘洪飞陈弘李志强万里黄绮周均铭罗毅韩英军中国科学院物理研究所北京100080 清华大学电子工程系北京100084

采用分子束外延方法在GaAs(0 0 1)衬底上生长出了 0 3微米厚的GaN薄膜 ,X射线双晶衍射和室温光荧光测试结果表明 ,采用GaAs氮化表面作为成核层可获得高纯度立方GaN薄膜而采用AlAs氮化表面作为成核层可获得高纯度六方GaN薄膜 .

关键词：砷化镓分子束外延生长氮化镓薄膜

The Nano Research Young Innovators Awards in bio-inspired nanomaterials

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第2期17卷 417-425页

作者： jun Chen Shuotao wang department of Bioengineering University of CaliforniaLos AngelesLos AngelesCA 90095USA Key laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Nano Research Young Innovators(NR45)Awards are designed to acknowledge and celebrate the achievements of young researchers under 45 years of *** individuals have made significant contributions to the field of nanoscience and *** the inaugural NR45 Awards in 2018,the journal's editorial board has recognized over a hundred innovators specializing in nanobiotechnology,nano energy,two-dimensional materials,and *** focus of the 2023 NR45 Awards is on bioinspired nanomaterials,acknowledging thirty-three outstanding young innovators for their extraordinary contributions in developing these materials with applications spanning clean energy,human healthcare,monitoring,and disease treatments,as shown in *** extend our heartfelt congratulations to all the 33 NR45 Awardees in 2023!

关键词： journal materials contributions

The impact of reabsorption effect on composition analysis of organic semiconductors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science china Materials 2024年第10期67卷 3124-3131页

作者： Bei Yang Xiaoke liu Li wan Weixin Ni Ni Yang Jianhui Hou Feng Gao Electronic and Photonic Materials(EFM) Department of PhysicsChemistry and Biology(IFM)Linkoping UniversityLinkoping SE-58183Sweden beijing National laboratory for Molecular sciences State Key Laboratory of Polymer and ChemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Max Planck institute of Microstructure Physic Halle 06120Germany

Reabsorption is one of the most fundamental optical phenomena,but it has rarely been considered in spectroscopy-based composition analysis for organic ***,we take four state-of-the-art organic solar cell(OSC)materials as examples,and systematically investigate the influence of reabsorption on photoluminescence emission and excitation spectra by both experimental studies and optical *** find that the overlap between absorption and emission spectra of these OSC materials is strong enough for them to be affected by the reabsorption effect,and the effect becomes more obvious between different species in the multi-components ***,three features of the reabsorption effect and the reabsorption strength are identified,with which we have successfully analyzed the composition in a range of OSC materials in both solution and solid-state *** work not only provides an important understanding of the largely overlooked feature of reabsorption in the widely used spectroscopic techniques but also offers an effective toolbox for the composition analysis of organic semiconductors.

关键词： reabsorption effect composition analysis organic solar cells non-fullerene acceptors organic semiconductors

Room-Temperature Continuous-Wave Operation of a Tunable External Cavity Quantum Cascade Laser

在线全文

学校读者我要写书评

暂无评论

chinese physics Letters 2011年第7期28卷 126-128页

作者： ZHANG Jin-Chuan wanG Li-jun liu wan-Feng liu Feng-Qi YIN Wen liu jun-Qi LI Lu wanG Zhan-Guo Key laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083 department of Electronic Engineering Tsinghua UniversityBeijing 100084

A room-temperature cw operation of a tunable external cavity(EC)quantum cascade laser(QCL)at an emitting wavelength of 4.6µm is ***−compensation combined with two-phonon resonance in an active region design promises low threshold current density.A very low threshold current density of 1.47 kA/cm^(2) for an EC−QCL operated in cw mode is ***-mode cw operation with a side-mode suppression ratio of 20 dB and a wide tuning range of over 110 cm-1 are ***,an even wider tuning range of over 135 cm^(−1) is obtained in pulsed mode at room temperature.

关键词： tuning mode Quantum

Dynamical-invariant-based holonomic quantum gates:Theory and experiment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fundamental Research 2023年第2期3卷 229-236页

作者： Yingcheng Li Tao Xin Chudan Qiu Keren Li Gangqin liu jun Li Yidun wan Dawei Lu State Key laboratory of Surface physics Department of PhysicsCenter for Field Theory and Particle Physicsand Institute for Nanoelectronic devices and Quantum computingFudan UniversityShanghai 200433China Shanghai Qi Zhi institute Shanghai 200030China Shenzhen institute for Quantum Science and Engineering and department of physics Southern University of Science and TechnologyShenzhen 518055China d Guangdong Provincial Key laboratory of Quantum Science and Engineering Shenzhen 518055GuangdongChina Center for Quantum Computing Peng Cheng LaboratoryShenzhen 518055China institute of physics Chinese Academy of SciencesBeijing 100190China

Among existing approaches to holonomic quantum computing,the adiabatic holonomic quantum gates(HQGs)suffer errors due to decoherence,while the non-adiabatic HQGs either require additional Hilbert spaces or are difficult to ***,we report a systematic,scalable approach based on dynamical invariants to realize HQGs without using additional Hilbert *** presenting the theoretical framework of our approach,we design and experimentally evaluate single-qubit and two-qubits HQGs for the nuclear magnetic resonance *** single-qubit gates acquire average fidelity 0.9972 by randomized benchmarking,and the controlled-NOT gate acquires fidelity 0.9782 by quantum process *** approach is also platform-independent,and thus may open a way to large-scale holonomic quantum computation.

关键词： Geometric gates Dynamical invariant Nuclear magnetic resonance Holonomic gates Platform-independent

Single site catalyst with enzyme-mimic micro-environment for electroreduction of CO_(2)

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 2022年第3期15卷 1817-1823页

作者： Chang Long Kaiwei wan Xueying Qiu Xiaofei Zhang Jianyu Han Pengfei An Zhongjie Yang Xiang Li jun Guo Xinghua Shi Hui wang Zhiyong Tang Shaoqin liu School of Materials Science and Engineering MOE Key Laboratory of Micro-systems and Micro-structures ManufacturingHarbin Institute of TechnologyHarbin150080China CAS key laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190China university of chinese academy of sciences Beijing100049China institute of High Energy physics CAS Beijing100049China

Single site catalysts provide a unique platform for mimicking natural enzyme due to their tunable interaction between metal center and coordinated ***,most works have focused on preparing structural and functional models of nature enzyme,with less reports also taking the local chemical environment,i.e.,functional/catalytic residues around the active site which is an essential feature of enzymes,into ***,we report a Co-centered porphyrinic polymer containing the enzyme-mimic micro-environment,where the linker triazole over CoN4 site enables formation of hydrogen bond with the*COOH intermediate,thus promoting the electrocatalytic reduction of CO_(2).As-prepared catalyst achieves the CO_(2)-to-CO conversion of 5,788 h^(−1) turnover frequency value and near unit(~96%)faradaic efficiency at−0.61 V versus reversible hydrogen *** strategy will bring new dimension of designing highly active single-site catalysts.

关键词： single-site catalyst CO_(2)electroreduction enzyme-mimic

H-Bonding Self-assembled Template-directed Synthesis of a Reactive Amide-bridged Ladder Polyvinylsiloxane

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

chinese Chemical Letters 2006年第10期17卷 1361-1364页

作者： You Zhi wan Ying Hua liu Ping XIE Rong Ben ZHANG department of Applied chemistry School of Science Beijing University of Chemical Technology Beijing 100029 State Key laboratory of polymer physics and chemistry Joint Laboratory of Polymer Science and Materials Institute of Chemistry Chinese Academy of Sciences Beijing 100080

A novel, reactive amide-bridged ladder polyvinylsiloxane （abbr. LP） with Mn= 2.4×10^4 was synthesized for the first time by means of aryl amide H-bonding self-assembled template. The regularity of LP was characterized by the XRD, ^29Si NMR and DSC methods. XRD analysis demonstrated the ladder width w = 9.09A and the ladder thickness t = 3.89A, respectively, which are approximately consistent with the molecular simulation-calculated ones： w＇= 10.60A and t＇= 3.06A. ^29Si NMR displayed a resonance peak with small half peak width, △1/2 - 4 ppm, for the moiety [=Si（Vi）O2/2-]n of LP. Besides, as a collateral evidence, DSC measurement revealed a high glass transition temperature Tg = 225℃, suggesting high stiffness of the ladder main chain of LP.

关键词： Ladder polyvinylsiloxane stepwise coupling polymerization amido H-bonding interaction.

Manipulating active layer morphology of molecular donor/polymer acceptor based organic solar cells through ternary blends

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2018年第8期61卷 1025-1033页

作者： Zijian Zhang Zicheng Ding David J.Jones Wallace W.H.Wong Bin Kan Zhaozhao Bi Xiangjian wan Wei Ma Yongsheng Chen Xiaojing Long ChuANDong Dou jun liu Lixiang wang State Key laboratory of polymer physics and chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China School of chemistry Bio21 Institute the University of Melbourne Parkville Victoria 3010 Australia Key laboratory for Functional polymer Materials and Centre for Nanoscale Science and Technology Institute of Polymer Chemistry College of Chemistry Nankai University Tianjin 300071 China Key laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China university of the chinese academy of sciences Beijing 100049 China

The development of molecular donor/polymer acceptor blend(MD/PA)-type organic solar cells(OSCs) lags far behind other type OSCs. It is due to the large-size phase separation morphology of MD/PAblend, which results from the high crystallinity of molecular donors. In this article, to suppress the crystallinity of molecular donors, we use ternary blends to develop OSCs based on one polymer acceptor(P-BNBP-f BT) and two molecular donors(DR3 TBDTT and BTR) with similar chemical *** ternary OSC exhibits a power conversion efficiency(PCE) of 4.85%, which is higher than those of the binary OSCs(PCE=3.60% or 3.86%). To our best knowledge, it is the first report of ternary MD/PA-type OSCs and this PCE is among the highest for MD/PA-type OSCs reported so far. Compared with the binary blends, the ternary blend exhibits decreased crystalline size and improved face-on orientation of the donors. As a result, the ternary blend exhibits improved and balanced charge mobilities, suppressed charge recombination and increased donor/acceptor interfacial areas, which leads to the higher shortcircuit current density. These results suggest that using ternary blend is an effective strategy to manipulate active layer morphology and enhance photovoltaic performance of MD/PA-type OSCs.

关键词： organic solar cells molecular donor polymer acceptor blend morphology ternary blend