检索结果-内蒙古大学图书馆

Stoichiometric effect on electrical and near-infrared photodetection properties of full-composition-range GaAs1−xSbx nanowires

引用

Nano Research 2021年第11期14卷 3961-3968页

作者： Jiamin Sun Mingming Han Meng Peng Lei Zhang Dong Liu Chengcheng Miao Jiafu Ye Zhiyong Pang Longbing He Hailu Wang Qing Li Peng Wang Lin Wang Xiaoshuang Chen Chongxin Shan Litao Sun Weida Hu Zai-xing Yang School of Physics and School of Microelectronics Shandong UniversityJinan250100China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai200083China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China SEU-FEI Nano-Pico Center Key Lab of MEMS of Ministry of EducationCollaborative Innovation Center for Micro/Nano FabricationDevice and SystemSoutheast UniversityNanjing210096China School of Physics and Photoelectric Engineering Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou310024China Henan Key Laboratory of Diamond Optoelectronic Materials and Devices School of Physics and EngineeringZhengzhou UniversityZhengzhou450001China

As one of the most important narrow bandgap ternary semiconductors, GaAs1−xSbx nanowires (NWs) have attracted extensive attention recently, due to the superior hole mobility and the tunable bandgap, which covers the whole near-infrared (NIR) region, for technological applications in next-generation high-performance electronics and NIR photodetection. However, it is still a challenge to the synthesis of high-quality GaAs1−xSbx NWs across the entire range of composition, resulting in the lack of correlation investigation among stoichiometry, microstructure, electronics, and NIR photodetection. Here, we demonstrate the success growth of high-quality GaAs1−xSbx NWs with full composition range by adopting a simple and low-cost surfactant-assisted solid source chemical vapor deposition method. All of the as-prepared NWs are uniform, smooth, and straight, without any phase segregation in all stoichiometric compositions. The lattice constants of each NW composition have been well correlated with the chemical stoichiometry and confirmed by high-resolution transmission electron microscopy, X-ray diffraction, and Raman spectrum. Moreover, with the increase of Sb concentration, the hole mobility of the as-fabricated field-effect-transistors and the responsivity and detectivity of the as-fabricated NIR photodetectors increase accordingly. All the results suggest a careful stoichiometric design is required for achieving optimal NW device performances.

关键词： GaAs1−xSbx nanowire stoichiometry effect full-composition-range field-effect hole mobility near-infrared photodetection

来源：评论

学校读者我要写书评

暂无评论

Hyperspectral Emissivity Estimation and Application Based on Machine Learning Method

Hyperspectral Emissivity Estimation and Application Based on...

引用

IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Xiujuan Li Hua Wu José Antonio Sobrino State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China Global Change Unit Image Processing Laboratory University of Valencia Valencia Spain University of Chinese Academy of Sciences Beijing China School of Resources and Environment University of Electronic Science and Technology of China Chengdu China

ISBN: (数字)9798350360325

ISBN: (纸本)9798350360332

Land surface emissivity (LSE) can reflect the unique spectral characteristics of land surfaces, which holds significant research value and promising applications. However, due to the limitations of spaceborne hyperspectral thermal infrared (TIR) sensors, there is currently a lack of high spatial resolution LSE imagery. Therefore, this study proposes a methodology based on machine learning and mathematical statistical approaches to extend multispectral emissivity values to hyperspectral LSE spectrums. Furthermore, the Spectral Angle Mapper (SAM) method was used for target identification. The results indicated that the proposed method can estimate hyperspectral LSE curves in high accuracy. Moreover, the target ground class can be identified accurately by matching the spectral angle with the measured LSE curve. This has crucial implications for applications such as land cover classification, mineral identification, geological exploration and soil property research.

关键词： Training Accuracy Databases Land surface Estimation Machine learning Thermal sensors

来源：评论

学校读者我要写书评

暂无评论

过去20年中国海水养殖空间分布变化

引用

Journal of Geographical Sciences 2023年第12期33卷 2377-2399页

作者：刘岳明王志华杨晓梅王绍强刘晓亮刘彬张俊瑶孟丹丁凯孟郜酷曾晓伟丁亚新 State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchCASBeijing100101China University of Chinese Academy of Sciences Beijing100049China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing100101China Jinling Institute of Technology Nanjing211169China School of Geography and Information Engineering China University of GeosciencesWuhan430074China School of Surveying and Land Information Engineering Henan Polytechnic UniversityJiaozuoHenan454000China

China’s mariculture provides more than 60%of the world’s mariculture products and plays an important role in the world’s aquaculture and food *** on changes in the spatial distribution pattern of China’s mariculture,however,remains *** accurately reflect the changes in the spatial pattern of mariculture in China,in this study,we used multitemporal optical and synthetic aperture radar remote sensing images to enhance the characteristics of mariculture and extracted the spatial distribution data for mariculture in China in 2000,2010,and ***,we explored the distribution pattern and changes in mariculture in *** found that,in 2020,China’s mariculture exhibited a distribution pattern of more in the north and less in the *** the Yangtze River estuary as the boundary,the proportion of mariculture in northern China was 70.9%,and that in southern China was only 29.1%.This difference did not exist in 2000,but it emerged because of the rapid development of mariculture in northern China from 2010 to *** addition,by superimposing the mariculture data with shoreline and water depth data,we found that more than 90%of China’s mariculture area was located in the sea area within 20 km of the shoreline and that more than 80%of the mariculture area was located in the sea area with water depths of less than 20 *** addition,the spatial distribution of mariculture in China developed from near the shore and moved outward from shallow to deep water *** examined the driving factors that influence changes in the spatial distribution of mariculture in *** argue that technological advancements in mariculture,as well as the intensive concentration of mariculture near the shore,policy constraints and incentives,and economic development,collaborate to shape the current pattern of mariculture development in China.

关键词： remote sensing mariculture coastal zone of China spatiotemporal variation

来源：评论

学校读者我要写书评

暂无评论

Nonvolatile Reconfigurable Phase-change-materials Integrated Silicon Photonics

Nonvolatile Reconfigurable Phase-change-materials Integrated...

引用

Progress in Electromagnetic Research Symposium (PIERS)

作者： Kai Xu Maoliang Wei Bo Tang Junying Li Yiting Yun Kunhao Lei Yingchun Wu Lan Li Hongtao Lin State Key Laboratory of Modern Optical Instrumentation Key Laboratory of Micro-Nano Electronics and Smart System of Zhejiang Province College of Information Science and Electronic Engineering Zhejiang University Hangzhou China Institute of Microelectronics of the Chinese Academy of Sciences Beijing China Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Hangzhou China Institute of Advanced Technology Westlake Institute for Advanced Study Hangzhou China

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375916

The emergence of integrated photonic technology provides an attractive solution of high speed, broad bandwidth and strong parallelism for large-scale information transmission and processing in interconnection, communication and computing. Reconfigurability is necessary for photonic processors to adapt varieties of application scenarios in the fields of data exchange, microwave photonics and neural networks. As yet, thermo-optical effect and carrier plasma dispersion effect are the most common phenomena for optical modulation. However, the volatility not only requires continuous power supply to maintain the devices’ state, but also accompanies with serious thermal crosstalk induced by active regions. Hence, the nonvolatile methods that can reconfigure and fix on the current state for a long time after a single external excitation are considered as one of the significant technologies in the next generation of integrated photonics. Nonvolatile reconfiguration has been achieved through trapped-charge effect, bistable micro-electromechanical system (MEMS) with nano-latch mechanism and ferroelectric materials, which suffer from high loss, lower stability and complex process flow. Chalcogenide phase change materials (PCM) have become a promising method to realize compact and nonvolatile reconfigurable integrated photonic devices due to the high optical constant contrast between amorphous state and crystalline state, superiorly stable property and low temperature deposition possibility. Here, we developed a monolithic back-end-of-line integration technology of PCM in silicon photonics, supporting "Zero-change" heterogeneous integration platform at wafer scale. On this basis, nonvolatile integrated photonic devices with excellent performance have been fabricated. It lays a foundation for improving the energy efficiency and integration density of integrated photonic processors and suppressing thermal crosstalk between integrated photonic devices.

关键词： Phase change materials Performance evaluation Optical losses Program processors Optical resonators Crosstalk Silicon photonics

来源：评论

学校读者我要写书评

暂无评论

Failure Envelopes of Single-Plate Rigid Helical Anchors In Clay

SSRN

引用

SSRN 2023年

作者： Chen, Hongzhen Wang, Le Tian, Yinghui Zhang, Chunhui Shen, Zhichao Liu, Mengmeng State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin China State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Civil Engineering Tianjin University China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology China Department of Infrastructure Engineering Faculty of Engineering and Information Technology The University of Melbourne VIC3010 Australia School of Civil Engineering Hebei University of Science and Technology Shijiazhuang China Hebei Technological Innovation Center of Disaster Prevention and Mitigation Engineering of Geotechnical and Structural System Shijiazhuang050018 China School of Marine Science and Engineering South China University of Technology 511442 China Institute of Ocean Energy and Intelligent Construction Tianjin University of Technology 300384 China

Helical anchor is a novel foundations for offshore wind turbines, which should be subjected to combined loading. However, the research about the capacity of helical anchor were mainly examined under uniaxial load and scarcely explored under combined loading. In this study, 3D finite element limit analysis is adopted to assess the bearing capacities of helical anchors with different diameter ratios DH/DS and embedment ratios L/DS. Result shows that the uniaxial bearing capacities increase with increasing DH/DS and L/DS. A series of failure mechanisms under different loading conditions were observed and can be used to explained the trend. Besides, the bearing capacities of helical anchor with varying DH/DS and L/DS under combined loads were also presented. A series of approximate expressions were proposed to fit the uniaxial bearing capacities and the failure envelopes. © 2023, The Authors. All rights reserved.

关键词： Bearing capacity

来源：评论

学校读者我要写书评

暂无评论

Stgc-Gnns: A Gnn-Based Traffic Prediction Framework with a Spatial-Temporal Granger Causality Graph

SSRN

引用

SSRN 2023年

作者： He, Silu Luo, Qinyao Du, Ronghua Zhao, Ling He, Guangjun Fu, Han Li, Haifeng Department of Geographic Information System Central South University Hunan Changsha410000 China College of Automotive and Mechanical Engineering Changsha University of Science and Technology Hunan Changsha410000 China State Key Laboratory of Space-Ground Integrated Information Technology Space Star Technology Co. Ltd. Beijing100000 China

The key to traffic prediction is to accurately depict the temporal dynamics of traffic flow traveling in a road network, so it is important to model the spatial dependence of the road network. The essence of spatial dependence is to accurately describe how traffic information transmission is affected by other nodes in the road network, and the GNN-based traffic prediction model, as a benchmark for traffic prediction, has become the most common method for the ability to model spatial dependence by transmitting traffic information with the message passing mechanism. However, existing methods model a local and static spatial dependence, which cannot transmit the global-dynamic traffic information (GDTi) required for long-term prediction. The challenge is the difficulty of detecting the precise transmission of GDTi due to the uncertainty of individual transport, especially for long-term transmission. In this paper, we propose a new hypothesis: GDTi behaves macroscopically as a transmitting causal relationship (TCR) underlying traffic flow, which remains stable under dynamic changing traffic flow. We further propose spatial-temporal Granger causality (STGC) to express TCR, which models global and dynamic spatial dependence. To model global transmission, we model the causal order and causal lag of TCR’s global transmission by a spatial-temporal alignment algorithm. To capture dynamic spatial dependence, we approximate the stable TCR underlying dynamic traffic flow by a Granger causality test. The experimental results on three backbone models show that using STGC to model the spatial dependence has better results than the original model for 45-min and 1 h long-term prediction. © 2023, The Authors. All rights reserved.

关键词： Message passing

来源：评论

学校读者我要写书评

暂无评论

A small-scale experimental study of CO_(2) enhanced injectivity methods of the high-rank coal

引用

Petroleum Science 2021年第5期18卷 1427-1440页

作者： Qing-He Niu Li-Wen Cao Shu-Xun Sang Wei Wang Wei Yuan Jiang-Fang Chang Xiao-Jun Jia Wei-Min Zheng Zeng-Xue Zhang State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang050043China Hebei Technology and Innovation Center on Safe and Efficient Mining of Metal Mines Shijiazhuang050043China School of Resource and Earth Science China University of Mining and TechnologyXuzhou221008China Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization China University of Mining and TechnologyXuzhou221008China Hebei Academy of Emergency Management Shijiazhuang050081China Hebei Iron and Steel Group Mining Co. LtdTangshan063000China Minmetals Mining Holding Co. LtdHefei241000China

The attenuation of CO_(2)injectivity has become the biggest technical barrier for the application of CO_(2)enhanced coalbed methane recovery(CO_(2)-ECBM).Commonly,the intermittent CO_(2)injection,N2 displacing CO_(2)and pre-fracturing are the potential CO_(2)enhanced injectivity methods for coal reservoirs,but their mechanism and effectiveness remain to be *** paper thus conducted small-scale experiments to simulate the working process of these engineering measures by an independently developed experimental *** show that the CO_(2)injectivity of coal is remarkably improved by the intermittent injection mode since the CO_(2)injection time is increased by folds and the loss of reservoir pressure can be complemented in *** N_(2)displacing CO_(2)method promotes the desorption of CO_(2)and reduces the swelling strain,with the result that the permeability of coal is improved by 74.82%and 64.95%compared with the methods of the primary subcritical CO_(2)(Sub CO_(2))and supercritical CO_(2)(Sc CO_(2))***,the permeability reduces again with the secondary CO_(2)*** permeability of the coal sample after pre-fracturing is averagely improved by 1-2 orders of magnitude,the irreversible permeability loss rate,average stress sensitivity coefficient and the permeability loss rate due to adsorption are averagely reduced by 95.885%,61.538%and 96.297%,*** indicates that the permeability of coal after pre-fracturing is no longer sensitive to both the effective stress and Sc CO_(2)adsorption,the injectivity is thus improved and *** CO_(2)enhanced injectivity effects of the intermittent CO_(2)injection,the N_(2)displacing CO_(2)and the pre-fracturing are various,which thus can be selected individually or jointly to improve the CO_(2)injectivity according to the reservoir physical properties and geological *** research deepens the understanding of the functional mechanism of CO_(2)enhanced injectivity method

关键词： Supercritical CO_(2) Permeability Intermittent injection N_(2)displacing CO_(2) Pre-fracturing

来源：评论

学校读者我要写书评

暂无评论

Real-Time Channel Power Monitoring and Optical Layer Signaling Transmission Over 1500 km G.652.D Fiber

Real-Time Channel Power Monitoring and Optical Layer Signali...

引用

Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Baoluo Yan Qiong Wu Hu Shi Zhenhua Feng Yinqiu Jia Yan Zhao Weizhang Chen Mo Zhu Yu Fang Bing Ye Hongbing Zou Zhiyong Zhao Yong Chen WDM system department of wireline product R&D institute ZTE Corp. Beijing China State Key Laboratory of Mobile Network and Mobile Multimedia Technology China

Using PT modulation, real-time channel power monitoring with 1.5 dB accuracy and optical layer signaling with receiver sensitivity less than -30 dBm after 1500 km transmission are achieved with negligible penalty to 1...

关键词：

来源：评论

学校读者我要写书评

暂无评论

Efficiently Utilizing Shallow and Deep Trapped Charges on Polyester Fiber Cloth Surface by Double Working Mode Design for High Output and Durability Teng

SSRN

引用

SSRN 2022年

作者： Shan, Chuncai He, Wencong Wu, Huiyuan Fu, Shaoke Li, Gui Du, Yan Wang, Jian Mu, Qianjin Guo, Hengyu Liu, Boyuan Hu, Chenguo Department of Applied Physics State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China Chongqing Yucai Secondary School China

Textile -based TENG is regarded as a promising technology for intelligent electronics and next-generation wearable devices by converting ambient and human mechanical energy into electric energy. Low output and poor mechanical durability still limits the development of textile-TENGs, although many methods are applied to improve their performance. Here, a double mode TENG (DM-TENG) containing two output channels is proposed, where one is a corona discharge TENG (CD-TENG) and the other is an electrostatic induction TENG (EI-TENG). Different from traditional CD-TENG that only collects shallow trapped charges on dielectric tribo-layer, the DM-TENG efficiently utilizes deep trapped charges (not involved in corona discharge) by adding induction electrodes connected with series diodes below the tribo-layer, which improves overall output without a decrease in respective output. Moreover, a unique lint-free cloth is used not only as an electropositivity tribo-material but also as a buffer layer due to its advantages of flexiblility and softness. A new durability record among this kind of air-breakdown based TENGs is achieved, where DM-TENG maintains 92% electric output and excellent mechanical stability after 20 k cycles under 100 N pressure at 0.5 m s -1 . In addition, DM-TENG reaches the output charge of 4.1 μC s -1 , peak power density of 9.8 W m -2 (16 times higher than that of textiles DC-TENG) and average power density of 3.2 W m -2 . Therefore, a new strategy provided in this work is an effective approach to enhance the output of flexible wearable TENGs. © 2022, The Authors. All rights reserved.

关键词： Nanogenerators

来源：评论

学校读者我要写书评

暂无评论

Effects of Nonmetallic Particles on Discharges and Breakdown of Liquid Nitrogen

引用

IEEE Transactions on Dielectrics and Electrical Insulation 2025年

作者： Xing, Yunqi Zheng, Xu Xiao, Kunran Wang, Mingyang Hebei University of Technology State Key Laboratory of Intelligent Power Distribution Equipment and System Tianjin300401 China

Aging of solid insulation and quenching heat of conductor in superconducting power equipment will degrade the insulation paper and generate fiber particle impurities, threatening the equipment's safe and stable operation. In this paper, the non-metallic particles in liquid nitrogen (LN2) are analyzed during force movement in DC, AC, and compound electric fields. The discharge and breakdown characteristics of LN2 containing particles under different electrode structures, voltage forms and particle properties are studied. The experiment results show that fiber particles have the least influence on the pin-plate electrode and breakdown voltage, and the influence of fiber particles on the plate-plate electrode and ball-ball electrode breakdown voltage is similar. The longitudinal electrode is easy to form a bridge under DC voltage, and the fiber particle concentration has a great influence on the initial discharge voltage and breakdown voltage. Particles move reciprocally in small amplitude under AC voltage and cannot form a bridge, but the insulation performance of LN2 is also weakened. Superposition voltage is more likely to cause insulation breakdown than the same value DC voltage, and the breakdown voltage is lower when the same polarity superposition than the different polarity. © 1994-2012 IEEE.

关键词： Electric breakdown of liquids

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：