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Boron-doped carbon dots:Doping strategies,performance effects,and applications 被引量:1
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作者 Qiang Fu Shouhong Sun +2 位作者 Kangzhi Lu Ning Li Zhanhua Dong 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第7期100-106,共7页
Due to their superior fluorescence,phosphorescence,and catalytic capabilities,carbon dots(CDs),an emerging class of fluorescent carbon nanomaterials,have a wide range of potential applications.The properties of CDs ha... Due to their superior fluorescence,phosphorescence,and catalytic capabilities,carbon dots(CDs),an emerging class of fluorescent carbon nanomaterials,have a wide range of potential applications.The properties of CDs have recently been controlled extensively by heteroatom doping.Boron atoms have been effectively doped into the structure of CDs due to their similar size to carbon atoms and excellent electron-absorbing ability to further improve the performance of CDs.In this review,we summarize the research progress of boron-doped CDs in recent years from the aspects of doping strategies,effects of boron doping on different performances of CDs and applications.Starting from the two aspects of single boron doping and boron and other atom co-doping,from different precursor materials to different synthesis methods,the doping strategies of boron-doped CDs are reviewed in detail.Then,the effects of boron doping on the fluorescence,phosphorescence and catalytic performance of CDs and applications of boron-doped CDs in optical sensors,information encryption and anti-counterfeiting are discussed.Finally,we further provide a prospect towards the future development of boron-doped CDs. 展开更多
关键词 Carbon dots BORON-DOPED Luminescent material Doping strategies performance effects
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Regulation effect of the grille spacing of a funnel-type grating water–sediment separation structure on the debris flow performance
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作者 LI Shuai GU Tianfeng +2 位作者 WANG Jiading WANG Fei LI Pu 《Journal of Mountain Science》 SCIE CSCD 2024年第7期2283-2304,共22页
The size of pores or the grille spacing of water–sediment separation structures directly affects their regulation effect on the debris flow performance.A suitable pore size or grille spacing can effectively improve t... The size of pores or the grille spacing of water–sediment separation structures directly affects their regulation effect on the debris flow performance.A suitable pore size or grille spacing can effectively improve the water–sediment separation ability of the structure.The new funnel-type grating water–sediment separation structure(FGWSS)combines vertical and horizontal structures and provides a satisfactory water–sediment separation effect.However,the regulation effect of the grille spacing of the structure on the debris flow performance has not been studied.The regulation effect of the structure grille spacing on the debris flow performance is studied through a flume test,and the optimal structure grille spacing is obtained.An empirical equation of the relationship between the relative grille spacing of the structure and the sediment separation rate is established.Finally,the influence of the water–sediment separation structure on the regulation effect of debris flows is examined from two aspects:external factors(properties of debris flows)and internal factors(structural factors).The experimental results show that the gradation characteristics of solid particles in debris flows constitute a key factor affecting the regulation effect of the structure on the debris flow performance.The optimum grille spacing of the FGWSS matches the particle size corresponding to the material distribution curves d85~d90 of the debris flow.The total separation rate of debris flow particles is related to the grille spacing of the structure and the content of coarse and fine particles in the debris flow. 展开更多
关键词 Debris flow Water–sediment separation structure Grille spacing performance regulation effect
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An Evaluation of the Effects of Cloud Parameterization in the R42L9 GCM 被引量:5
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作者 吴统文 王在志 +2 位作者 刘屹岷 宇如聪 吴国雄 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2004年第2期153-162,共10页
Cloud is one of the uncertainty factors influencing the performance of a general circulation model (GCM). Recently, the State Key Laboratory of Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmosph... Cloud is one of the uncertainty factors influencing the performance of a general circulation model (GCM). Recently, the State Key Laboratory of Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics (LASG/IAP) has developed a new version of a GCM (R42L9). In this work, roles of cloud parameterization in the R42L9 are evaluated through a comparison between two 20-year simulations using different cloud schemes. One scheme is that the cloud in the model is diagnosed from relative humidity and vertical velocity, and the other one is that diagnostic cloud is replaced by retrieved cloud amount from the International Satellite Cloud Climatology Project (ISCCP), combined with the amounts of high-, middle-, and low-cloud and heights of the cloud base and top from the NCEP. The boreal winter and summer seasonal means, as well as the annual mean, of the simulated top-of-atmosphere shortwave radiative flux, surface energy fluxes, and precipitation are analyzed in comparison with the observational estimates and NCEP reanalysis data. The results show that the scheme of diagnostic cloud parameterization greatly contributes to model biases of radiative budget and precipitation. When our derived cloud fractions are used to replace the diagnostic cloud amount, the top-of-atmosphere and surface radiation fields are better estimated as well as the spatial pattern of precipitation. The simulations of the regional precipitation, especially over the equatorial Indian Ocean in winter and the Asia-western Pacific region in summer, are obviously improved. 展开更多
关键词 cloud parameterization effect of cloud on model performance R42L9 model climatological cloud scheme diagnostic cloud scheme
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Effect of Residual Charge Carrier on the Performance of a Graphene Field Effect Transistor
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作者 Sedighe Salimian Mohammad Esmaeil Azim Araghi 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第1期113-117,共5页
The temperature-dependent effect of residual charge carrier (no), at the Dirac point, on mobility is studied. We fabricate and characterize a graphene field effect transistor (GFET) using 7nm TiO2 as the top-gate ... The temperature-dependent effect of residual charge carrier (no), at the Dirac point, on mobility is studied. We fabricate and characterize a graphene field effect transistor (GFET) using 7nm TiO2 as the top-gate dielectric. The temperature-dependent gate voltage-drain current and room temperature gate capacitance are measured to extract the carrier mobility and to estimate the quantum capacitance of the GFET. The device shows the mobility value of gOO cm^2 /V.s at room temperature and it decreases to 45 cm^2 /V.s for 20 K due to the increase of n0. These results indicate that the phonon scattering is not the dominant process for the unevenness dielectric layer while the coulomb scattering by charged impurities degrades the device characteristically at low temperature. 展开更多
关键词 of it by Effect of Residual Charge Carrier on the performance of a Graphene Field Effect Transistor on IS VTG HIGH for into that
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Performance Evaluation of Multiple Unmanned Aerial Vehicles Operating in General Regime with Shortage of Maintenance Facilities
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作者 Joseph Kreimer 《Journal of Computer and Communications》 2016年第10期70-78,共9页
We consider a real-world problem of military intelligence unit equipped with multiple identical unmanned aerial vehicles (UAV) responsible for several regions (with requests of real-time jobs arriving from independent... We consider a real-world problem of military intelligence unit equipped with multiple identical unmanned aerial vehicles (UAV) responsible for several regions (with requests of real-time jobs arriving from independent sources). We suppose that there are no ample maintenance facilities, allowing simultaneous treatment of all vehicles if necessary. Under certain assumptions, these real-time systems can be treated using a queueing theory methodology and/or as Markov chains. We show how to compute steady-state probabilities of these systems, their performance effectiveness, and various performance parameters (for exponentially distributed service and maintenance times of UAVs, as well as tasks duration and their arrival pattern). 展开更多
关键词 Markov Chain performance Effectiveness QUEUING Real-Time Systems Unmanned Aerial Vehicles
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High-Temperature Performance Analysis of AlGaN/GaN Polarization Doped Field Effect Transistors Based on the Quasi-Multi-Channel Model
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作者 房玉龙 冯志红 +6 位作者 李成明 宋旭波 尹甲运 周幸叶 王元刚 吕元杰 蔡树军 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第3期117-120,共4页
We report on the temperature-dependent dc performance of A1GaN/GaN polarization doped field effect transistors (PolFETs). The rough decrements of drain current and transeonductance with the operation temperature are... We report on the temperature-dependent dc performance of A1GaN/GaN polarization doped field effect transistors (PolFETs). The rough decrements of drain current and transeonductance with the operation temperature are observed. Compared with the conventional HFETs, the drain current drop of the PolFET is smaller. The transeonductance drop of PolFETs at different gate biases shows different temperature dependences. From the aspect of the unique carrier behaviors of graded AlGaN/GaN heterostructure, we propose a quasi-multi-channel model to investigate the physics behind the temperature-dependent performance of AlGaN/GaN PolFETs. 展开更多
关键词 AlGaN High-Temperature performance Analysis of AlGaN/GaN Polarization Doped Field Effect Transistors Based on the Quasi-Multi-Channel Model
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Brightness of Blue/Violet Luminescent Nano-Crystalline AZO and IZO Thin Films with Effect of Layer Number:For High Optical Performance
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作者 Panagiota KORAL Songül FAT VAROL +1 位作者 Michael KOMPITSAS Mihaela GIRTAN 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第5期80-83,共4页
From different reports, it (AZO) and indium-doped including usage areas. We nanocrystalline films with is realized that there is a need to consider all sides of aluminum-doped zinc oxide zinc oxide (IZO) thin film... From different reports, it (AZO) and indium-doped including usage areas. We nanocrystalline films with is realized that there is a need to consider all sides of aluminum-doped zinc oxide zinc oxide (IZO) thin films with their optical, luminescence and surface properties establish an assessment to carry out further information to summarize AZO and IZO impact of the layer number. 展开更多
关键词 of in is AZO ZnO Brightness of Blue/Violet Luminescent Nano-Crystalline AZO and IZO Thin Films with Effect of Layer Number:For High Optical performance for that with
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Effect of Pulse and dc Formation on the Performance of One-Transistor and One-Resistor Resistance Random Access Memory Devices
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作者 刘红涛 杨保和 +7 位作者 吕杭炳 许晓欣 罗庆 王国明 张美芸 龙世兵 刘琦 刘明 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第2期157-159,共3页
We investigate the effect of the formation process under pulse and dc modes on the performance of one transistor and one resistor (1 T1R) resistance random access memory (RRAM) device. All the devices are operated... We investigate the effect of the formation process under pulse and dc modes on the performance of one transistor and one resistor (1 T1R) resistance random access memory (RRAM) device. All the devices are operated under the same test conditions, except for the initial formation process with different modes. Based on the statistical results, the high resistance state (FIRS) under the dc forming mode shows a lower value with better distribution compared with that under the pulse mode. One of the possible reasons for such a phenomenon originates from different properties of conductive filament (CF) formed in the resistive switching layer under two different modes. For the dc forming mode, the formed filament is thought to be continuous, which is hard to be ruptured, resulting in a lower HRS. However, in the case of pulse forming, the filament is discontinuous where the transport mechanism is governed by hopping. The low resistance state (LRS) can be easily changed by removing a few trapping states from the conducting path. Hence, a higher FIRS is thus observed. However, the HRS resistance is highly dependent on the length of the gap opened. A slight variation of the gap length will cause wide dispersion of resistance. 展开更多
关键词 Effect of Pulse and dc Formation on the performance of One-Transistor and One-Resistor Resistance Random Access Memory Devices
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Influence of Velocity Overshoot Effect on High Frequency Perform- ance of AlGaAs / GaAs HBT's
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作者 Xu Jun, Liu Youbao and Huang Chang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 1992年第4期14-15,18-2+6,共5页
The semiclassical transport equations are used to study the high frequency performance of AlGaAs / GaAs HBTs. Electron velocity overshoot effect and its influence on the cut off frequency characteristics of AlGaAs / G... The semiclassical transport equations are used to study the high frequency performance of AlGaAs / GaAs HBTs. Electron velocity overshoot effect and its influence on the cut off frequency characteristics of AlGaAs / GaAs HBTs with different collector design parameters are analyzed and discussed. 展开更多
关键词 HBT Influence of Velocity Overshoot Effect on High Frequency Perform high ance of AlGaAs
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Air turbulence effects on performance of optical wireless communication with crosstalk in server backplane
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作者 D.Elmakias D.Bykhovsky S.Arnon 《Chinese Optics Letters》 SCIE EI CAS CSCD 2017年第2期20-24,共5页
Free space optical interconnections(FSOIs) are anticipated to become a prevalent technology for short-range high-speed communication. FSOIs use lasers in board-to-board and rack-to-rack communication to achieve impr... Free space optical interconnections(FSOIs) are anticipated to become a prevalent technology for short-range high-speed communication. FSOIs use lasers in board-to-board and rack-to-rack communication to achieve improved performance in next generation servers and are expected to help meet the growing demand for massive amounts of inter-card data communication. An array of transmitters and receivers arranged to create an optical bus for inter-card and card-to-backplane communication could be the solution. However, both chip heating and cooling fans produce temperature gradients and hot air flow that results in air turbulence inside the server, which induces signal fading and, hence, influences the communication performance. In addition, the proximity between neighboring transmitters and receivers in the array leads to crosstalk in the received signal, which further contributes to signal degradation. In this Letter, the primary objective is to experimentally examine the off-axis crosstalk between links in the presence of turbulence inside a server chassis. The effects of geometrical and inter-chassis turbulence characteristics are investigated and first-and second-order statistics are derived. 展开更多
关键词 Air turbulence effects on performance of optical wireless communication with crosstalk in server backplane
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THE EFFECTS OF CORRELATED SENSOR SIGNAL FLUCTUATION ON THE STATISTICAL PERFORMANCE OF AN AR HIGH RESOLUTION ARRAY PROCESSOR
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《Chinese Journal of Acoustics》 1989年第3期209-218,共10页
The statistical performance of AR high resolution array processor in presence of correlated sensor signal fluctuation is studied. Mean square inverse beam pattern and pointing error are examined. Special attention is ... The statistical performance of AR high resolution array processor in presence of correlated sensor signal fluctuation is studied. Mean square inverse beam pattern and pointing error are examined. Special attention is paid to the effects of reference sensor and correlation between sensors. It is shown that fluctuation causes broadening or even distortion of the mean square inverse beam pattern. Phase fluctuation causes pointing error. Its standard variance is proportional to that of fluctuation and is related to the number of sensors of the array. Correlation between sensors has important effects on pointing error. 展开更多
关键词 THE effects OF CORRELATED SENSOR SIGNAL FLUCTUATION ON THE STATISTICAL performance OF AN AR HIGH RESOLUTION ARRAY PROCESSOR AR exp ASSP over
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Effect of optical losses on the transmission performance of a radio-over-fiber distributed antenna system
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作者 龚志山 徐坤 +5 位作者 孟学军 裴寅清 孙小强 戴一堂 纪越峰 林金桐 《Chinese Optics Letters》 SCIE EI CAS CSCD 2013年第2期8-11,共4页
The effects of optical losses oil a directly-modulated radio-over-fiber (RoF) system used for distributed antenna networks are determined. The results show that with a properly designed bidirectional amplifier, the ... The effects of optical losses oil a directly-modulated radio-over-fiber (RoF) system used for distributed antenna networks are determined. The results show that with a properly designed bidirectional amplifier, the RoF link can tolerate over 20 and 16 dB of optical losses for down- and up-links, respectively. Simulation results are also consistent with the experimental data. These findings can contribute to tile design of RoF distributed antenna systems with different topologies. 展开更多
关键词 ROF Effect of optical losses on the transmission performance of a radio-over-fiber distributed antenna system OVER LINK WIFI
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HIT-SEDAES: An integrated software environment for simulation experiment design, analysis and evaluation 被引量:1
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作者 Wei Li Lingyun Lu +2 位作者 Zhizhao Liu Ping Ma Ming Yang 《International Journal of Modeling, Simulation, and Scientific Computing》 EI 2016年第3期263-284,共22页
Simulation is a powerful technique in evaluating and improving the performance of complex systems.In order to improve the efficiency of simulation experiment design,analysis and evaluation,auxiliary tools are required... Simulation is a powerful technique in evaluating and improving the performance of complex systems.In order to improve the efficiency of simulation experiment design,analysis and evaluation,auxiliary tools are required.Unfortunately,existing tools are usually not meeting the requirements of simulation.Moreover,the restricted interfaces,reusability and expandability influence their efficiency to a certain extent.In this paper,an integrated software environment,HIT-SEDAES,is designed for solving these problems.A process model of simulation experiment design,analysis and evaluation is introduced to guide the development of the software environment.And several solutions are proposed to solve key problems in this development.Finally,an application is used to illustrate how the software environment works for the problems of model validation,effectiveness evaluation and performance analysis. 展开更多
关键词 SIMULATION experiment design effectiveness/performance evaluation simulation optimization integrated software environment
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