检索结果-南通市图书馆

Winter Wheat Yield Estimation Based on Sparrow Search Algorithm Combined with Random Forest:A Case Study in Henan Province,China

引用

Chinese Geographical Science 2024年第2期34卷 342-356页

作者： SHI Xiaoliang chen jiajun DING Hao YANG Yuanqi ZHANG Yan College of Geomatics Xi’an University of Science and TechnologyXi’an 710054China

Precise and timely prediction of crop yields is crucial for food security and the development of agricultural ***,crop yield is influenced by multiple factors within complex growth *** research has paid relatively little attention to the interference of environmental factors and drought on the growth of winter ***,there is an urgent need for more effective methods to explore the inherent relationship between these factors and crop yield,making precise yield prediction increasingly *** study was based on four type of indicators including meteorological,crop growth status,environmental,and drought index,from October 2003 to June 2019 in Henan Province as the basic data for predicting winter wheat *** the sparrow search al-gorithm combined with random forest(SSA-RF)under different input indicators,accuracy of winter wheat yield estimation was *** estimation accuracy of SSA-RF was compared with partial least squares regression(PLSR),extreme gradient boosting(XG-Boost),and random forest(RF)***,the determined optimal yield estimation method was used to predict winter wheat yield in three typical *** are the findings:1)the SSA-RF demonstrates superior performance in estimating winter wheat yield compared to other *** best yield estimation method is achieved by four types indicators’composition with SSA-RF)(R^(2)=0.805,RRMSE=9.9%.2)Crops growth status and environmental indicators play significant roles in wheat yield estimation,accounting for 46%and 22%of the yield importance among all indicators,respectively.3)Selecting indicators from October to April of the follow-ing year yielded the highest accuracy in winter wheat yield estimation,with an R^(2)of 0.826 and an RMSE of 9.0%.Yield estimates can be completed two months before the winter wheat harvest in June.4)The predicted performance will be slightly affected by severe *** with severe drought year(201

关键词： winter wheat yield estimation sparrow search algorithm combined with random forest(SSA-RF) machine learning multi-source indicator optimal lead time Henan Province,China

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Real-time Risk-averse Dispatch of an Integrated Electricity and Natural Gas System via Condi-tional Value-at-risk-based Lookup-table Ap-proximate Dynamic Programming

引用

Protection and Control of Modern Power Systems 2024年第2期9卷 47-60页

作者： Jianquan Zhu Guanhai Li Ye Guo jiajun chen Haixin Liu Yuhao Luo Wenhao Liu School of Electric Power Engineering South China University of Tech-nologyGuangzhou 510640China South China University of Technology GuangzhouChina

The real-time risk-averse dispatch problem of an integrated electricity and natural gas system(IEGS)is studied in this *** is formulated as a real-time conditional value-at-risk(CVaR)-based risk-averse dis-patch model in the Markov decision process *** of its stochasticity,nonconvexity and nonlinearity,the model is difficult to analyze by traditional algorithms in an acceptable *** address this non-deterministic polynomial-hard problem,a CVaR-based lookup-table approximate dynamic programming(CVaR-ADP)algo-rithm is proposed,and the risk-averse dispatch problem is decoupled into a series of tractable *** line pack is used as the state variable to describe the impact of one period’s decision on the *** facilitates the reduction of load shedding and wind power *** the proposed method,real-time decisions can be made according to the current information,while the value functions can be used to overview the whole opti-mization horizon to balance the current cost and future risk *** simulations indicate that the pro-posed method can effectively measure and control the risk costs in extreme ***,the decisions can be made within 10 s,which meets the requirement of the real-time dispatch of an *** Terms—Integrated electricity and natural gas system,approximate dynamic programming,real-time dispatch,risk-averse,conditional value-at-risk.

关键词： Integrated electricity and natural gas system approximate dynamic programming real-time dispatch risk-averse conditional value-at-risk

来源：

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

Intelligence Driven Wireless Networks in B5G and 6G Era:A Survey

引用

ZTE Communications 2024年第3期22卷 99-105页

作者： GAO Yin chen jiajun LI Dapeng State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen 518055China Wireless Product R&D Institute ZTE CorporationShanghai 201203China

As the wireless communication network undergoes continuous expansion,the challenges associated with network management and optimization are becoming increasingly *** address these challenges,the emerging artificial intelligence(AI)and machine learning(ML)technologies have been introduced as a powerful *** empower wireless networks to operate autonomously,predictively,ondemand,and with smart functionality,offering a promising resolution to intricate optimization *** paper aims to delve into the prevalent applications of AI/ML technologies in the optimization of wireless *** paper not only provides insights into the current landscape but also outlines our vision for the future and considerations regarding the development of an intelligent 6G network.

关键词： intelligent network native AI load prediction trajectory prediction

来源：

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

Intelligence Driven Wireless Networks in B5G and 6G Era: A Survey

引用

ZTE Communications 2024年

作者： GAO Yin chen jiajun LI Dapeng State Key Laboratory of Mobile Network and Mobile Multimedia Technology Wireless Product R&D Institute， ZTE Corporation

As the wireless communication network undergoes continuous expansion， the challenges associated with network management and optimization are becoming increasingly complex. To address these challenges， the emerging artificial intelligence (AI) and machine learning (ML) technologies have been introduced as a powerful solution. They empower wireless networks to operate autonomously， predictively， on-demand， and with smart functionality， offering a promising resolution to intricate optimization problems. This paper aims to delve into the prevalent applications of AI/ML technologies in the optimization of wireless networks. The paper not only provides insights into the current landscape but also outlines our vision for the future and considerations regarding the development of an intelligent 6G network.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Therapeutic Effect of Intragastric Administration of Jiangtang Shuxin Recipe Suspension on Diabetic Heart Failure in Rats and Its Mechanism

引用

Medicinal Plant 2024年第2期15卷 33-37页

作者： Xiaofeng JIANG jiajun chen Guangming HUANG Yaya SHEN Xianzhao FU Clinical Medical College Youjiang Medical University for NationalitiesBaise 533000China Department of Rehabilitation Medicine Affiliated Hospital of Youjiang Medical University for NationalitiesBaise 533000China Department of Traditional Chinese Medicine Affiliated Hospital of Youjiang Medical University for NationalitiesBaise 533000China

[Objectives]To observe the therapeutic effect of intragastric administration of Jiangtang Shuxin recipe on diabetic heart failure(DHF)in rats and to explore its mechanism.[Methods]Fifty SD rats were randomly divided into five groups,with 10 rats in each *** models were prepared in the low-dose group,high-dose group,Western medicine group,and model group except the control *** in the low-dose and high-dose groups were given 1.0 and 1.5 g/(kg·d)Jiangtang Shuxin recipe suspension by gavage,*** in the Western medicine group were given gliquidone and benazepril by gavage for 2 months,and were fed with high-fat *** in the control group were fed with ordinary *** blood glucose(FBG),serum triglyceride(TG),low-density lipoprotein cholesterol(LDL-C),high-density lipoprotein cholesterol(HDL-C),C-reactive protein(CRP),interleukin-6(IL-6),tumor necrosis factor-α(TNF-α),creatine kinase isoenzyme(CK-MB),lactate dehydrogenase(LDH),pathological morphology of myocardial tissue,NF-κB p65 protein and IκBαprotein were compared among groups.[Results]Compared with the control group,the levels of FBG,serum TG,LDL-C,CRP,IL-6,TNF-α,CK-MB and LDH increased,while the level of serum HDL-C *** myocardial tissue was seriously damaged,and the expression of NF-κB p65 protein increased,while the expression of IκBαprotein decreased in the other four gruops(all P<0.05).Compared with the model group,the levels of FBG,serum TG,LDL-C,CRP,IL-6,TNF-α,CK-MB and LDH decreased,while the serum HDL-C level *** myocardial tissue damage was alleviated,and the expression of NF-κB p65 protein decreased,while the expression of IκBαprotein increased in the low-dose group,high-dose group and Western medicine group(all P<0.05).Compared with the Western medicine group,the levels of FBG,serum TG,LDL-C,CRP,IL-6,TNF-α,CK-MB and LDH decreased,and the level of serum HDL-C increased in the high-dose group(all P<0.05).[Conclusions]Jiangtang Shuxin recipe has a thera

关键词： Jiangtang Shuxin recipe Diabetes complications Heart failure NF-кB signaling pathway

来源：

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

Bi_(2)Te_(3)/KOH/PEDOT:PSS和SiO_(2)气凝胶增强钢丝绒热电性能研究

引用

功能材料 2024年第6期55卷 6101-6107,6117页

作者：彭小敏雷洪陈伽俊西南科技大学材料与化学学院四川绵阳621000

在热电材料研究领域,一般认为金属的Seebeck系数较低,因此有关金属的热电性能的研究并不多见。但研究发现金属的物理形态对其热电性能具有影响。考察了金属纤维钢丝绒(SW)的热电性能。发现SW(主要成分为Fe)的Seebeck系数是块体铁的2倍... 详细信息

在热电材料研究领域,一般认为金属的Seebeck系数较低,因此有关金属的热电性能的研究并不多见。但研究发现金属的物理形态对其热电性能具有影响。考察了金属纤维钢丝绒(SW)的热电性能。发现SW(主要成分为Fe)的Seebeck系数是块体铁的2倍。在此基础上,将SW与有机和无机热电材料进行复合,并在其空隙中填充SiO_(2)气凝胶,最终制备出了Bi_(2)Te_(3)/KOH/PEDOT:PSS@SW-SiO_(2)气凝胶复合材料,使其热电性能得到了进一步提升。结果表明,气凝胶的加入可使SW的导热系数降低34%。电导率(σ)、热导率(κ)和Seebeck系数(S)得到解耦。Bi_(2)Te_(3)/KOH/PEDOT:PSS@SW-SiO_(2)气凝胶的Seebeck系数、热电优值(ZT)和功率因子(PF)分别是纯SW的1.2、3.4、2.4倍。通过改变材料物理形态和添加气凝胶来提高材料热电性能的方式有望为其他热电材料的研究提供新的思路和有益参考。

关键词：钢丝绒热电材料热电性能金属纤维复合物 SiO_(2)气凝胶

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Unveiling the pressure-driven metal–semiconductor–metal transition in the doped TiS_(2)

引用

Chinese Physics B 2024年第6期33卷 63-67页

作者：陈佳骏吕心邓李思敏但雅倩黄艳萍崔田 Institute of High Pressure Physics School of Physical Science and TechnologyNingbo UniversityNingbo 315211China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China

Conventional theories expect that materials under pressure exhibit expanded valence and conduction bands,leading to increased electrical ***,we report the electrical properties of the doped 1T-TiS_(2) under high pressure by electrical resistance investigations,synchrotron x-ray diffraction,Raman scattering and theoretical *** to 70 GPa,an unusual metal-semiconductor-metal transition *** first-principles calculations suggest that the observed anti-Wilson transition from metal to semiconductor at 17 GPa is due to the electron localization induced by the intercalated Ti *** electron localization is attributed to the strengthened coupling between the doped Ti atoms and S atoms,and the Anderson localization arising from the disordered *** pressures exceeding 30.5 GPa,the doped TiS_(2) undergoes a re-metallization transition initiated by a crystal structure phase *** assign the most probable space group as P2_(1)2_(1)2_(1).Our findings suggest that materials probably will eventually undergo the Wilson transition when subjected to sufficient pressure.

关键词： high pressure transition metal dichalcogenides doped TiS_(2) electronic phase transition

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于t-SNE-VNWOA的船舶柴油机故障诊断

引用

武汉理工大学学报（交通科学与工程版） 2024年第1期48卷 37-42页

作者：尚前明陈家君邱天武汉理工大学船海与能源动力工程学院武汉430063

文中提出一种基于t-SNE-VNWOA-LSSVM故障诊断模型,并进行了台架试验.试验设置了正常工况、供气不足、燃烧提前和单缸断油四种工况,将各种工况采集的缸盖振动信号进行快速傅里叶变换(FFT),提取了13个时域和频域特征,利用t分布邻域嵌入算... 详细信息

文中提出一种基于t-SNE-VNWOA-LSSVM故障诊断模型,并进行了台架试验.试验设置了正常工况、供气不足、燃烧提前和单缸断油四种工况,将各种工况采集的缸盖振动信号进行快速傅里叶变换(FFT),提取了13个时域和频域特征,利用t分布邻域嵌入算法(t-SNE)对数据降维、可视化故障特征.结合鲸鱼优化算法(VNWOA)对分类器(LSSVM)初始参数δ2和γ寻优,搭建其故障识别模型,将遗传算法(GA)和粒子群算法(PSO)的寻优诊断结果与之对比.结果表明:基于t-SNE-VNWOA-LSSVM故障诊断模型精度高达96.57%,且具有良好的稳定性及诊断速度.

关键词：柴油机故障诊断 t-SNE VNWOA 振动信号 LSSVM

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Monitoring and engineering interface coupling between monolayer WS_(2)and substrate through controllably introducing interfacial strain

引用

Science China Materials 2024年第9期67卷 3012-3020页

作者： Xiaofei Yue jiajun chen Jinkun Han Yabing Shan Shuwen Shen Wenxuan Wu Bingjie Liu Lijia Li Yu chen Rongjun Zhang Laigui Hu Ran Liu Zhijun Qiu Chunxiao Cong School of Information Science and Technology Fudan UniversityShanghai200433China Commonwealth Scientific and Industrial Research Organization(CSIRO) ClaytonVictoria3168Australia Yiwu Research Institute of Fudan University Yiwu322000China

The interface properties in two-dimensional(2D)layered materials and their van der Waals(vdW)homo-/heterostructures are of importance in both uncovering novel physical phenomena and optimizing device *** considerable research interest and enthusiasm direct toward the interlayer coupling in 2D homo-and heterostructures,there is limited research on the coupling at the 2D layered material-substrate *** limitation is due to the challenges in achieving direct ***,the coupling mechanisms at the 2D layered material-substrate interface is ambiguous,which needs greater *** this study,we have systematically investigated the interface coupling between monolayer WS_(2)and its supported substrates using high-temperature and high-vacuum in-situ Raman spectroscopy through monitoring the low-frequency Raman mode of monolayer WS_(2).Our findings reveal that both interfacial spacing and strain can significantly affect the coupling strength between the monolayer WS_(2)and the supported *** notably,we found that the strategic introduction of appropriate interfacial strain can effectively enhance the interface ***,we have succeeded in achieving effective regulation of the sample-substrate coupling via a convenient way of controlling the cooling process during *** findings contribute to a deeper understanding of the coupling correlation between 2D layered materials and substrates,which is of great significance for the design and optimization of high-performance devices based on 2D layered semiconductors.

关键词： two-dimensional layered material substrate interface coupling low-frequency Raman mode interfacial spacing interfacial strain

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

含多齿不同间隙的人字星型齿轮系统的齿距误差相位匹配研究

引用

Acta Mechanica Sinica 2024年第3期40卷 242-260页

作者：陈家俊朱如鹏陈蔚芳李苗苗尹逊民张晓旭 National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing210016China 703 Research Institute China Shipbuilding Industry CorporationHarbin150000China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin150000China

在加工过程中,齿轮不可避免地会产生齿距误差,这会加剧人字星型齿轮系统(HSGT)的振动和噪声.尽管加工精度是有限的,但通过适当的组合误差相位可以进一步提高系统的动态性能.本工作中,根据齿距误差的周期性及其对间隙的影响,推导了传动... 详细信息

在加工过程中,齿轮不可避免地会产生齿距误差,这会加剧人字星型齿轮系统(HSGT)的振动和噪声.尽管加工精度是有限的,但通过适当的组合误差相位可以进一步提高系统的动态性能.本工作中,根据齿距误差的周期性及其对间隙的影响,推导了传动过程中啮合齿对形成的不同齿隙,然后分别考虑各齿对的啮合状态和误差激振力.建立了在齿距误差影响下含有多齿不同间隙的HSGT动力学模型,并通过齿轮箱振动实验验证了该模型的可靠性.基于该模型分析了人字中心齿轮两侧误差相位的调整对均载性能的影响机理,探索了三个平行星型齿轮最优的误差相位组合.当齿距误差值一定时,本研究可以指导HSGT中各人字齿轮误差相位的组合,从而减少振动,提高系统的均载性能.

关键词： Herringbone gear Star gear system Pitch error Time-varying backlash Load-sharing characteristics

来源：

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

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：