检索结果-南通市图书馆

NUCLEAR SCIENCE AND TECHNIQUES 2024年第10期35卷 1-12页

作者： Xue, Yuan-Yuan wang, zu-jun Ma, Wu-Ying Liu, Min-Bo He, Bao-Ping Gou, Shi-Long Northwest Inst Nucl Technol State Key Lab Intense Pulsed Irradiat Simulat & Ef Xian 710024 Peoples R China Peking Univ Sch Phys State Key Lab Artificial Microstruct & Microscop P Beijing 100871 Peoples R China

This study investigates the effects of displacement damage on the dark signal of a pinned photodiode CMOS image sensor (CIS) following irradiation with back-streaming white neutrons from white neutron sources at the China spallation neutron source (CSNS) and Xi'an pulsed reactor (XAPR). The mean dark signal, dark signal non-uniformity (DSNU), dark signal distribution, and hot pixels of the CIS were compared between the CSNS back-n and XAPR neutron irradiations. The non-ionizing energy loss and energy distribution of primary knock-on atoms in silicon, induced by neutrons, were calculated using the open-source package Geant4. An analysis combining experimental and simulation results showed a noticeable proportionality between the increase in the mean dark signal and the displacement damage dose (DDD). Additionally, neutron energies influence DSNU, dark signal distribution, and hot pixels. High neutron energies at the same DDD level may lead to pronounced dark signal non-uniformity and elevated hot pixel values.

关键词： Displacement damage effects CMOS image sensor (CIS) CSNS back-n XAPR neutrons Geant4 Dark signal non-uniformity (DSNU) PROTON

Evaluating electron induced degradation of triple-junction solar cell by numerical simulation

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

Optoelectronics Letters 2021年第5期17卷 276-282页

作者： LI jun-wei wang zu-jun SHI Cheng-ying XUE Yuan-yuan NING Hao XU Rui Xi’an Research Institute of High-Technology Xi’an710025China Northwest Institute of Nuclear Technology Xi’an710024China School of Materials Science and Engineering Xiangtan UniversityXiangtan411105China

In this paper,the degradation related parameters of GaInP/GaAs/Ge triple-junction solar cell induced by electron irradiation are carried out by numerical *** degradation results of short-circuit current,open-circuit voltage,maximum power have been investigated,and the degradation mechanism is *** the degradation results,the degradation of normalized parameters versus displacement damage dose is *** results show that the degradation increases with the increase of the electron fluence and electron irradiation *** degradation normalized related parameters versus displacement damage dose can be characterized by a special curve that is not affected by the type of irradiated *** calculating the annual displacement damage dose and the on-orbit operation time of special space orbit,the degradation of normalized parameters can be obtained with the fitting curve in the *** study will provide an approach to estimate the radiation damage of triple-junction solar cell induced by space particle irradiation.

关键词： Evaluating electron induced degradation of triple-junction solar cell by numerical simulation

Multi-scale persistent spatiotemporal transformer for long-term urban traffic flow prediction

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2024年第1期22卷 53-69页

作者： Jia-jun Zhong Yong Ma Xin-Zheng Niu Philippe Fournier-Viger Bing wang zu-kuan Wei School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China College of Computer Science&Software Engineering Shenzhen UniversityShenzhen518060China School of Computer Science Southwest Petroleum UniversityChengdu610500China

Long-term urban traffic flow prediction is an important task in the field of intelligent transportation,as it can help optimize traffic management and improve travel *** improve prediction accuracy,a crucial issue is how to model spatiotemporal dependency in urban traffic *** recent years,many studies have adopted spatiotemporal neural networks to extract key information from traffic ***,most models ignore the semantic spatial similarity between long-distance areas when mining spatial *** also ignore the impact of predicted time steps on the next unpredicted time step for making long-term ***,these models lack a comprehensive data embedding process to represent complex spatiotemporal *** paper proposes a multi-scale persistent spatiotemporal transformer(MSPSTT)model to perform accurate long-term traffic flow prediction in *** adopts an encoder-decoder structure and incorporates temporal,periodic,and spatial features to fully embed urban traffic data to address these *** model consists of a spatiotemporal encoder and a spatiotemporal decoder,which rely on temporal,geospatial,and semantic space multi-head attention modules to dynamically extract temporal,geospatial,and semantic *** spatiotemporal decoder combines the context information provided by the encoder,integrates the predicted time step information,and is iteratively updated to learn the correlation between different time steps in the broader time range to improve the model’s accuracy for long-term *** on four public transportation datasets demonstrate that MSPSTT outperforms the existing models by up to 9.5%on three common metrics.

关键词： Graph neural network Multi-head attention mechanism Spatio-temporal dependency Traffic flow prediction

Uniformity of Asymmetric Augmented Designs

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

Acta Mathematicae Applicatae Sinica 2024年第4期40卷 1025-1044页

作者： Zhi-qing wang Xiang-yu FANG zu-jun OU College of Mathematics and Statistics Jishou UniversityJishou 416000China

Follow-up experimental designs are widely applied to explore the relationship between factors and responses step by step in various fields such as science and *** some additional resources or information become available after the initial design of experiment is carried out,some additional runs and/or factors may be added in the follow-up *** this paper,the issue of the uniform row augmented designs and column augmented designs with mixed two-,three-and four-level is *** uniformity of augmented designs is discussed under the wrap-around L_(2)-*** lower bounds of wrap-around L_(2)-discrepancy for the augmented designs are obtained,which can be used to assess uniformity of augmented *** results show that augmented designs have high efficiency,which have low discrepancy and close to the proposed lower bounds.

关键词： augmented design follow-up design uniform design wrap-around L_(2)-discrepancy

在线全文

学校读者我要写书评

暂无评论

方正县农机化发展现状与对策

农机化研究 2007年第8期29卷 217-219页

作者：王祖君方正县农业机械管理总站黑龙江方正150800

近年来,方正县农机管理系统在各级党委、政府的领导下,紧紧围绕农业结构的调整,与时俱进,开拓进取,卓有成效地开展了农业机械化各项工作,使全县的农业机械化保持了良好、稳定的发展态势。为此,总结了方正县农业机械化发展概况和特点,分... 详细信息

近年来,方正县农机管理系统在各级党委、政府的领导下,紧紧围绕农业结构的调整,与时俱进,开拓进取,卓有成效地开展了农业机械化各项工作,使全县的农业机械化保持了良好、稳定的发展态势。为此,总结了方正县农业机械化发展概况和特点,分析了农业机械化发展中存在的问题,提出了加快方正县农业机械化发展的对策建议。

关键词：农业工程农业机械化综述现状对策

A hybrid WUDT-NAFnet for simultaneous source data deblending

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第3期21卷 1649-1659页

作者： Chao-Fan Ke Shao-Huan zu jun-Xing Cao Xu-Dong Jiang Chao Li Xing-Ye Liu Key Laboratory of Earth Exploration and Information Technology of Ministry of Education Chengdu University of Technology State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology College of Geophysics Chengdu University of Technology

Simultaneous source technology,which reduces seismic survey time and improves the quality of seismic data by firing more than one source with a narrow time interval,is compromised by the massive blended ***,deblending algorithms have been developed to separate this ***,deep learning(DL)has been proved its great potential in suppressing the *** most popular DL method employs neural network as a filter to attenuate the blended noise in an iterative estimation and subtraction framework(IESF).However,there are still amplitude distortion and blended noise residual problems,especially when dealing with weak signal submerged in strong *** address these problems,we propose a hybrid WUDT-NAFnet,which contains two *** first network is a wavelet based U-shape deblending transformer network(WUDTnet),incorporated into IESF as a robust regularization term to iteratively separate the blended *** second network is a nonlinear activate free network(NAFnet)designed to recover the event amplitude and further suppress the weak noise residual in *** the hybrid network,the blended noise can be separated purposefully and *** using synthetic and field seismic data demonstrate that the WUDTNAFnet outperforms traditional curvelet transform(CT)based method and the deblending transformer(DT)model in terms of ***,for field applications,the data augmentation method of bicubic interpolation is applied to mitigate the feature difference between synthetic and field ***,the trained network exhibits strong signal preservation ability in numerical field example without requiring additional training.

关键词： Simultaneous-source Deblending Deep learning Transformer

Selective photosynthesis of imines from biomass-derived aldehydes over Ni/TiO_(2)

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第3期43卷 1116-1124页

作者： Wu-Lin Li Qing-Qing Zhang Lin Dong Wen-jun Zhang Li-Li Lin zu-Peng Chen Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Chemical EngineeringNanjing Forestry UniversityNanjing210037China Institute of Industrial Catalysis State Key Laboratory of Green Chemistry Synthesis TechnologyCollege of Chemical EngineeringZhejiang University of TechnologyHangzhou310014China

Photocatalytic reductive amination of biomass-derived aldehydes is a desirable way to selectively upgrade biomass into value-added nitrogen-containing chemicals under mild ***,it is challenging to produce imines in high selectivity because of the undesirable side reactions caused by the activity of functional ***,we demonstrate the highly reactive and selective production of imines from biomass derived aldehydes via the photocatalytic reductive amination,using a defective TiO_(2)supported nickel *** employment of methanol as the hydrogen donor and ammonia solution as the nitrogen source avoids the use of high-pressure H_(2)and expensive amines,rendering the current catalytic process safe,economical,and environmentally *** depth investigations attribute the improved separation and transfer of photogenerated charge carriers to the presence of oxygen vacancies and decorated Ni nanoparticles,thereby accelerating the production of imines from benzaldehyde amination(conversion,95.8%;seleetivity,95.2%).Furthermore,the developed system could be easily translated to the photocatalytic conversions of various biomass derived aldehydes,which provided an example of a cost-effective and sustainable approach for the valorization of biomass derived feedstocks.

关键词： Photocatalysis Biomass derivatives Imines Reduction amination Heterogeneous catalyst

De novo Synthesis of Chiral 3,4-Dihydroquinazolines via One-Pot Enantioselective Ugi-Azide/Cyclization Sequences

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2024年第18期42卷 2140-2146页

作者： zu-Kui Xie jun-jun Ding Yi-Ming Ou jun-Xiu Shi Meng-Lan Shen Chuan-Zhi Yao Hua-Jie Jiang Jie Yu Department of Applied Chemistry Anhui Province Engineering Laboratory for Green Pesticide Development and Applicationand Anhui Province Key Laboratory of Crop Integrated Pest ManagementAnhui Agricultural UniversityHefeiAnhui 230036China

Background and Originality Content,3,4-Dihydroquinazoline frameworks have frequently been encountered in natural products and bioactive *** the past decades,these key structures prompted the development of creative pharmaceuticals owing to their prominent biological properties,including trypanothione reductase(TryR)inhibitor,Hepatitis B virus(HBV)inhibitive activities,anticancer activities,etc.(Scheme 1A).[1]Notably,the chirality of the C4 atom is crucial for drug *** example,the DPC-083 is a potent reverse transcriptase inhibitor for the treatment of HIV infection but the undesired enantiomers exhibit virtually no activity.[ia]Therefore,developing synthetic methods for innovative chiral 4-substituted 3,4-dihydroquinazolines is significant and essential for drug discovery.

关键词： Anionic stereogenic-at-cobalt(ll)complex De novo synthesis post-Ugi transformation One-pot sequence Asymmetric synthesis Multicomponentreactions

Surface-to-bulk engineering with high-valence W6+ enabling stabilized single-crystal LiNi0.9Co0.05Mn0.05O2 cathode

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

Journal of Energy Chemistry 2024年第11期 67-76页

作者： jun-Ke Liu Xue-Rui Yang Chuan-Wei wang zu-Wei Yin Yi-Yang Hu Li Deng Zhen wang Yao Zhou jun-Tao Li College of Energy Xiamen University School of Physics and Materials Science Nanchang University College of Chemistry and Chemical Engineering Xiamen University

Single-crystal Nickel-rich layered oxides has been recognized as one of the promising cathodes for nextgeneration lithium batteries on account of their high capacity,while its practical application was hindered by structural instability and slow Li+transfer ***,a surface-to-bulk engineered single-crystal LiNi0.9Co0.05Mn0.05O2（Ni90） cathode,which features W-doped bulk and Li2WO4surface layer,was successfully achieved by a one-step high-valence W6+*** as-obtained W-modified Ni90 delivers excellent cycling stability（89.8% capacity retention after 300 cycles at 0.5 C）and rate *** enhanced electrochemical performance was ascribed to the doped-W induced stabilized lattice oxygen,reduced Li+/Ni2+mixing and inhibited H2-H3 phase transition in the bulk,and Li2WO4layer generated stabilized cathode/electrolyte *** addition,the thinner LiF-rich cathode electrolyte interphase（CEI） on surface and smaller grain size for W-modified Ni90 benefit to its Li+diffusion *** effect of high-valence W6+on single-crystal Ni-rich cathode was firstly revealed in detail,which deepens the understanding of electrochemical behavior of Ni-rich cathode with high-valence cations modification,and provides clues for design of high-performance layered cathodes.

关键词：

Dual template-induced construction of three-dimensional porous SiO2/NC/Co-CNTs heterostructure with highly dispersed active sites for efficient oxygen evolution reaction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Tungsten 2024年第3期6卷 585-595页

作者： Hai-Qi Zhang Xiao-jun Zeng Qing-Qing Zhang zu-Liang Zhang Chu-Long Jin Rong-Hai Yu School of Materials Science and Engineering Jingdezhen Ceramic University School of Materials Science and Engineering Beihang University

The development and exploration of efficient and economical electrocatalysts for oxygen evolution reaction（OER） represents the main bottleneck to unlocking a sustainable energy scenario based on elec trocataly tic water *** scale integration of three-dimensional（3D） porous heterostructure with highly dispersed active sites and good structural stability is ***,a dual template route is developed to construct the 3D porous SiO2/nitrogen-doped carbon（NC）/Co-carbon nano tubes（CNTs） hetero ***,the hard template（SiO2nano spheres） contributes to 3D porous structure,increases the specific surface area,and promotes the contact area of the *** the same time,the soft template（basic zinc carbonate） can control the growth of 1D CNTs and facilitate the exposure of the active ***,3D porous SiO2/NC/Co-CNTs hetero structure inherits highly dispersed Co nanoparticles coated by *** conductive channels and abundant N hetero atoms doping are reasonably constructed by a dual template ***,SiO2/NC/Co-CNTs catalyst provides an extraordinary activity for the OER in alkaline media,with a low overpotential of 298 mV at a current density of 10 mA·***,SiO2/NC/Co-CNTs hetero structure enables excellent long-term durability with a 10 mV decay in overpotential after 3000 cyclic voltammetry cycles,and 97% remain in current density over 20 *** is believed that this dual template strategy can provide a new and simple way to construct a highly dispersed active site in electrocatalysts.

关键词： Dual template High dispersion Porous heterostructure Conductive channels Oxygen evolution reaction