检索结果-南通市图书馆

Journal of Integrative Agriculture 2013年第7期12卷 1201-1207页

作者： LI Jing WEI tao SUN Ai-rui NI Han-wen College of Agronomy and Biotechnology China Agricultural University

The virulent strain B6 of Curvularia lunata was screened out from 65 fungus strains isolated from the diseased leaves of barnyardgrass （Echinochloa crus-galli）. Greenhouse and field studies were conducted to evaluate the feasibility of the strain being exploited as a mycoherbicide for barnyardgrass control in paddy fields. The results of pathogenicity experiments showed that this strain was highly pathogenic to barnyardgrass at the 1- to 2.5-leaf stages. The fresh weight reduction increased with the increase of inoculated conidial concentrations and the prolongation of dew duration. Strain B6 provided excellent barnyardgrass control when it was applied at the concentration of 1×104-1×106 conidia mL-1 in paddy fields with water layer. This strain was very safe to rice and the most plant species except wheat, barley and corn. Findings of this study indicated that this strain could be a potential mycoherbicide for barnyardgrass control in paddy fields in the future.

关键词： barnyardgrass Curvularia lunata biological control mycoherbicide rice

在线全文

学校读者我要写书评

暂无评论

基于BP神经网络X频段调制器故障预测

飞控与探测 2024年第1期7卷 58-61页

作者：章玉珠张康雷孙哲煜芮涛魏祎上海航天电子技术研究所上海201109

采用反向传播(Back Propagation,BP)神经网络对X频段调制器的故障预测进行研究,通过仿真软件编程构建BP神经网络故障预测模型,验证X频段调制器输出功率指标的精确性,根据测试结果表明建立的BP神经网络故障模型预测误差很小,能够较准确对... 详细信息

采用反向传播(Back Propagation,BP)神经网络对X频段调制器的故障预测进行研究,通过仿真软件编程构建BP神经网络故障预测模型,验证X频段调制器输出功率指标的精确性,根据测试结果表明建立的BP神经网络故障模型预测误差很小,能够较准确对X频段调制器的输出功率故障进行预测。

关键词：神经网络 X频段调制器输出功率故障预测

维普期刊数据库博看期刊

The time‑varying causal relationship between the Bitcoin market and internet attention

在线全文

学校读者我要写书评

暂无评论

Financial Innovation 2021年第1期7卷 1489-1507页

作者： Xun Zhang Fengbin Lu rui tao Shouyang Wang CEFS MADISAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China

The increasing attention on Bitcoin since 2013 prompts the issue of possible evidence for a causal relationship between the Bitcoin market and internet *** the Google search volume index as the measure of internet attention,time-varying Granger causality between the global Bitcoin market and internet attention is *** results show a strong Granger causal relationship between internet attention and trading ***,they indicate,beginning in early 2018,an even stronger impact of trading volume on internet attention,which is consistent with the rapid increase in Bitcoin users following the 2017 Bitcoin *** Bitcoin returns are found to strongly affect internet attention,internet attention only occasionally affects Bitcoin *** investigation reveals that interactions between internet attention and returns can be amplified by extreme changes in prices,and internet attention is more likely to lead to returns during Bitcoin *** empirical findings shed light on cryptocurrency investor attention theory and imply trading strategy in Bitcoin markets.

关键词： Bitcoin Internet attention Google trends Time-varying granger causality Multiple bubbles test

卢赛尔体育场钢结构卸载应力及变形监测技术研究与应用

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

空间结构 2024年第1期30卷 47-54页

作者：黄韬睿吴晶晶邓旭洋白光波朱忠义张健中国铁建国际集团有限公司北京100855 精工国际钢结构有限公司上海201100 北京市建筑设计研究院有限公司北京100045

对卢赛尔体育场钢结构卸载过程中应力应变监测系统进行详细论述,根据结构敏感性分析结果选取应力应变监测点位置,制定监测方案.采用振弦式应变计对结构关键应力进行数据采集,并根据数据采集结果进行结构安全分析与监测.传感器的数据平... 详细信息

对卢赛尔体育场钢结构卸载过程中应力应变监测系统进行详细论述,根据结构敏感性分析结果选取应力应变监测点位置,制定监测方案.采用振弦式应变计对结构关键应力进行数据采集,并根据数据采集结果进行结构安全分析与监测.传感器的数据平滑度和定性分析均说明,监测系统为正常工作状态;应力监控结果表明卸载安全可控,可为后续工程施工提供依据.

关键词：钢结构卸载应力应变监测敏感性分析数据采集

Tune the electronic structure of MoS_(2)homojunction for broadband photodetection

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第24期119卷 61-68页

作者： rui tao Xianlin Qu Zegao Wang Fang Li Lei Yang Jiheng Li Dan Wang Kun Zheng Mingdong Dong College of Materials Science and Engineering Sichuan UniversityChengdu 610065China Beijing Key Lab of Microstructure and Properties of Solids Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China State Key Laboratory for Advanced Metals&Materials University of Science&Technology BeijingBeijing 100083China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Interdisciplinary Nanoscience Center Aarhus UniversityAarhus 8000Denmark

Due to the weak absorption and low light-matter interaction of MoS_(2),intrinsic MoS_(2)photodetector usually has low photoresponse,thus limiting its real ***,MoS_(2)homojunction was constructed by using the chemical vapor deposition grown intrinsic MoS_(2)films and the Nb-doped MoS_(2)*** results show that the Nb doping will induce p-type doping in MoS_(2),where the electron concentration will decrease by 2.08×10^(12)cm^(–2)after Nb *** investigating the photoelectric effect of MoS_(2)/Nb-doped MoS_(2)homojunction-based phototransistor,the tunability of the photoresponse,detectivity as the function of the external field,wavelength,and power of light have been studied in *** results show that the photoresponse and detectivity are strongly dependent on the gate voltage due to the external field tuned interlayer photoexcitation attributing to the band *** maximum of photoresponse can reach 51.4 A/W,the detectivity can reach 3.0×10^(12)Jones,which is two orders higher than that of intrinsic MoS_(2).Furthermore,by correlating the photoresponse and detectivity with the external field,it is found that the photodetection of MoS_(2)homojunction can be significantly tuned and exhibit well photodetection in *** comprehensive work not only sheds light on the tunable photoexcitation mechanism but also offers a strategy to achieve a high-performance photodetector.

关键词： Molybdenum disulfide P-type doping Homojunction Photoresponse Tunability

Stability of NiCrAlY coating/titanium alloy system under pure thermal exposure

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2017年第8期36卷 659-665页

作者： Xiao-Min Peng An-Ru Wu Li-Jun Dong You-rui tao Wei-Guo Gao Xiang-Lin Zhou State Key Laboratory of Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China School of Mechanical Engineering Hunan Institute of EngineeringXiangtan 411101China

In this paper,NiCrAlY coating was deposited on TC4 titanium alloy using arc ion plating,and the stability of NiCrAlY coating/TC4 substrate system under pure thermal exposure was analyzed in a wide temperature *** the thermal exposure,β→γ′→γphase transformation takes place in the NiCrAlY *** NiCrAlY coating phases totally decompose above the allotropic transformation temperature of *** allotropic transformation ofα-Ti to β-Ti of the substrate significantly influences the stability of NiCrAlY coating/TC4 substrate *** coating elements are mainly consumed by interfacial reactions below the allotropic transformation temperature of *** the allotropic transformation temperature of TC4,NiCrAlY coating elements are mainly consumed by element dissolution in β-*** NiCrAlY coating totally degrades for the dissolution of coating elements in the substrate to form thickβ-Ti stabilized layer.

关键词： NiCrAlY coating Titanium alloy Stability Pure thermal exposure Degradation

Reliability modelling and assessment of CMOS image sensor under radiation environment

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第9期37卷 297-311页

作者： tao, Zhao CHEN, Wenbin LI, Xiaoyang KANG, rui School of Reliability and Systems Engineering Beihang University Beijing 100191 China Science and Technology on Reliability and Environmental Engineering Laboratory Beijing 100191 China

The Complementary Metal-Oxide Semiconductor (CMOS) image sensor is a critical component with the function of providing accurate positioning in many space application systems. Under long-time operation in space environments, there are radiation related degradation and various uncertainties affecting the positioning accuracy of CMOS image sensors, which further leads to a reliability reduction of CMOS image sensors. Obviously, the reliability of CMOS image sensors is related to their specified function, degradation, and uncertainties; however, current research has not fully described this relationship. In this paper, a comprehensive approach to reliability modelling of CMOS image sensors is proposed based on the reliability science principles. Firstly, the performance margin modelling of centroid positioning accuracy is conducted. Then, the degradation model of CMOS image sensors is derived considering the dark current increase induced by the total ionizing dose effects. Finally, various uncertainties are analyzed and quantified, and the measurement equation of reliability is proposed. A case study of a CMOS image sensor is conducted to apply the proposed method, and the sensitivity analysis can provide suggestions for design and use of CMOS image sensors to ensure reliability. A simulation study is conducted to present the advantages of the proposed comprehensive approach. © 2024

关键词： CMOS integrated circuits

Surface states in crystals with low-index surfaces

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

Chinese Physics B 2015年第11期24卷 434-441页

作者：王会平陶瑞宝 State Key Laboratory of Surface Physics and Department of Physics Fudan University Collaborative Innovation Center of Advanced Microstructures Fudan University

For most of the conventional crystals with low-index surfaces, the hopping between the nearest neighbor （1NN） crystal planes （CPs） is dominant and the ones from the nNN （2 〈 n 〈 ∞） CPs are relatively weak, considered as small perturbations. The recent theoretical analysisIll has demonstrated the absence of surface states at the level of the hopping approximation between the INN CPs when the original infinite crystal has the geometric reflection symmetry （GRS） for each CP. Meanwhile, based on the perturbation theory, it has also been shown that small perturbations from the hopping between the nNN （2 〈 n 〈 ∞） CPs and surface relaxation have no impact on the above conclusion. However, for the crystals with strong intrinsic spin-orbit coupling （SOC）, the dominant terms of intrinsic SOC associate with two INN bond hoppings. Thus SOC will significantly contribute the hoppings from the INN and/or 2NN CPs except the ones within each CP. Here, we will study the effect of the hopping between the 2NN CPs on the surface states in model crystals with three different type structures （Type I： “……P-P-P-P……”, Type II： “……-P-Q-P-Q……” and Type III：“……P=Q-P=Q……” where P and Q indicate CPs and the signs “-” and “=” mark the distance between the INN CPs）. In terms of analytical and numerical calculations, we study the behavior of surface states in three types after the symmetric/asymmetric hopping from the 2NN CPs is added. We analytically prove that the symmetric hopping from the 2NN CPs cannot induce surface states in Type I when each CP has only one electron mode. The numerical calculations also provide strong support for the conclusion, even up to 5NN. However, in general, the coupling from the 2NN CPs （symmetric and asymmetric） is favorable to generate surface states except Type I with single electron mode only.

关键词： surface states transfer matrix method exact diagonalization method

Evolutionary Multi-Tasking Optimization for High-Efficiency Time Series Data Clustering

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2024年第2期29卷 343-355页

作者： rui Wang Wenhua Li Kaili Shen tao Zhang Xiangke Liao Xiangjiang Laboratory Changsha 410205China College of Systems Engineering National University of Defense TechnologyChangsha 410073China Ant Group Co. Ltd.Hangzhou 310000China College of Computer Science and Technology NUDTChangsha 410073China

Time series clustering is a challenging problem due to the large-volume,high-dimensional,and warping characteristics of time series *** clustering methods often use a single criterion or distance measure,which may not capture all the features of the *** paper proposes a novel method for time series clustering based on evolutionary multi-tasking optimization,termed i-MFEA,which uses an improved multifactorial evolutionary algorithm to optimize multiple clustering tasks simultaneously,each with a different validity index or distance ***,i-MFEA can produce diverse and robust clustering solutions that satisfy various preferences of *** on two artificial datasets show that i-MFEA outperforms single-objective evolutionary algorithms and traditional clustering methods in terms of convergence speed and clustering *** paper also discusses how i-MFEA can address two long-standing issues in time series clustering:the choice of appropriate similarity measure and the number of clusters.

关键词： time series clustering evolutionary multi-tasking multifactorial optimization clustering validity index distance measure

Tune the photoresponse of monolayer MoS_(2) by decorating CsPbBr_(3) perovskite nanoparticles

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

Chinese Chemical Letters 2023年第7期34卷 345-349页

作者： Chao Tan rui tao Zhihao Yang Lei Yang Xiaolei Huang Yong Yang Fei Qi Zegao Wang College of Materials Science and Engineering Sichuan UniversityChengdu 610065China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi'an 710072 China College of Optoelectronic Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China

Tuning the photoresponse of monolayer MoS_(2) could extend its potential application in many fields,however,it is still a *** this study,CsPbBr_(3) nanoparticles were prepared and spin-coated on the surface of monolayer MoS_(2) to fabricate hybrid CsPbBr_(3)/MoS_(2) *** combing the photoelectrical property of the CsPbBr_(3),the synergistic effect has been systematically studied from its carrier mobility,photoresponse and *** was found that nanofilm-coating of CsPbBr_(3)would impede the photoelectric performance due to the electron-hole recombination facilitated by the defects at the interface of C PbBr_(3) and MoS_(2) *** the nanoparticles decorating was observed to significantly improve the conductivity of the monolayer Mo S_(2),which also increased the on/off ratio of the MoS_(2) transistor from 8.2×10~3 to 4.4×10^(4),and enhanced the carrier mobility from 0.090 cm^(2)V^(-1)s^(-1)to 0.202 cm^(2)V^(-1)s^(-1),ascribing to a mixed electron recombination-injection ***,the CsPbBr_(3) nanofilm would decrease the responsivity to 136 and 178 A/W under the light wavelength of 400 and 500 nm,respectively,while decorating CsPbBr_(3) nanoparticles improve the photoresponse to 948 and 883 A/W with the detectivity at the level of 10^(11)*** work may provide an easy and cost-efficient way to tune the photoresponse of MoS_(2) photodetectors.

关键词： MoS_(2)photodetector CsPbBr_(3)NPs Surface charge doping Carrier mobility Photoresponse