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建筑施工数字孪生模型智能预警技术研究

建筑技术开发 2024年第2期51卷 3-6页

作者：黄海荣任旭升郭勇博河南工业大学土木工程学院郑州450000

智能建造技术通过将建筑信息模型(BIM)、数字孪生、物联网等信息技术相互融合,在建筑施工中实现目标的信息集成与综合物联。而在目前建筑业的智能化发展过程中,还存在着信息化水平低、管理决策不科学、过于依赖施工经验等问题。因此,首... 详细信息

智能建造技术通过将建筑信息模型(BIM)、数字孪生、物联网等信息技术相互融合,在建筑施工中实现目标的信息集成与综合物联。而在目前建筑业的智能化发展过程中,还存在着信息化水平低、管理决策不科学、过于依赖施工经验等问题。因此,首先建立建筑施工数字孪生模型框架,然后搭建智能监控预警系统,通过将现场监测数据与理论模型的信息进行对比,对实际工程施工进行修正,对建筑施工项目智能信息化发展是有指导作用。

关键词：智能建造物联网数字孪生监测预警

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气象因素对甘蔗糖分含量的影响及模型构建

中国农业气象 2024年第6期45卷 609-618页

作者：郑国俊祝光湖王勤龙黄海荣李翔罗霆马鹏程王泽平桂林电子科技大学数学与计算科学学院/广西应用数学中心桂林541004 广西农业科学院甘蔗研究所/农业农村部广西甘蔗生物技术与遗传改良重点实验室南宁530007

利用随机森林和向前逐步选择算法筛选关键气象因素,基于广义加性模型等构建6类甘蔗糖分含量模拟模型,以关键气象因子为自变量模拟甘蔗成熟期的糖分含量,通过模拟值与实测值对比分析,对模拟效果进行评价,并量化关键气象因素对甘蔗糖分含... 详细信息

利用随机森林和向前逐步选择算法筛选关键气象因素,基于广义加性模型等构建6类甘蔗糖分含量模拟模型,以关键气象因子为自变量模拟甘蔗成熟期的糖分含量,通过模拟值与实测值对比分析,对模拟效果进行评价,并量化关键气象因素对甘蔗糖分含量的影响。结果表明:不同地区、不同时间尺度气象因素对甘蔗糖分含量均有影响,关键气象因素包括气温日较差、最低地温、日照时数、最高气温、平均气压、降水量及平均相对湿度,气温日较差对甘蔗糖分含量的影响呈近似稳定的线性趋势,其余关键气象因素对甘蔗糖分含量的影响呈复杂波动趋势。基于关键气象因素建立模拟甘蔗糖分含量的6种模型,广义加性模型模拟效果最优,拟合R^(2)达0.97,模型验证的绝对误差为0.12个百分点,相对误差为0.86%,均方根误差为0.15。说明模拟值与实测值具有较好的一致性与相关性,模型可实现对广西甘蔗糖分含量的预测,同时,量化关键气象因素对甘蔗糖分含量的影响,也为调控生态系统提供依据。

关键词：甘蔗糖分含量气象因素随机森林回归模型模拟

基于GWO-BP神经网络及粮食压缩实验对粮食孔隙率的预测

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粮油食品科技 2024年第2期32卷 186-193页

作者：陈家豪李嘉欣郑德乾尹君黄海荣葛蒙蒙张佳怡河南工业大学土木工程学院河南郑州450001 河南省粮油仓储建筑与安全重点实验室河南郑州450001 国家粮食和物资储备局科学研究院粮食储运研究所北京100037

孔隙率是影响粮堆内热湿传递的关键参数,为探究粮仓中散装粮堆孔隙率的分布规律,通过开展粮食压缩实验来获取不同的粮食种类在不同水分含量和竖向压力条件下的孔隙率。提出了一种基于灰狼算法优化BP(GWO-BP)神经网络的粮食单元体孔隙率... 详细信息

孔隙率是影响粮堆内热湿传递的关键参数,为探究粮仓中散装粮堆孔隙率的分布规律,通过开展粮食压缩实验来获取不同的粮食种类在不同水分含量和竖向压力条件下的孔隙率。提出了一种基于灰狼算法优化BP(GWO-BP)神经网络的粮食单元体孔隙率预测模型,并将该模型与BP神经网络模型、随机森林模型的孔隙率预测结果进行对比,最后利用粮食单元箱实验对该模型的泛化能力进行验证。结果表明,GWO-BP神经网络模型的孔隙率预测性能最佳,该模型的评价指标R2为0.960 5、RMSE为0.013 7及MAE为0.0131,均在允许的范围内。本研究为粮食孔隙率的确定提供了一种神经网络预测的方法,为深入开展粮堆多场耦合分析提供了重要基础,为安全储粮提供了理论支持。

关键词： GWO-BP模型粮食孔隙率压缩实验预测

Cytokine Profiles and Virological Marker Monitoring during 48 Weeks Peginterferon Alfa Treatment for HBeAg-Positive Chronic Hepatitis B

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Biomedical and Environmental Sciences 2022年第4期35卷 312-321页

作者： LI Ming Hui SUN Fang Fang CHEN Feng Xin ZENG Zhan LIN Yan Jie BI Xiao Yue YANG Liu DENG Wen JIANG Ting Ting huang rong hai YI Wei XIE Yao Department of Hepatology Division 2 Beijing Ditan HospitalCapital Medical UniversityBeijing 100015China Department of Hepatology Division 2 Peking University Ditan Teaching HospitalBeijing 100015China Capital Medical University Beijing 100069China Department of Infectious Diseases Capital Medical UniversityBeijing 100015China Department of General Surgery Capital Medical UniversityBeijing 100015China Department of Gynecology and Obstetrics Beijing Ditan HospitalCapital Medical UniversityBeijing 100015China

Objective This study aimed to investigate whether cytokine profiles and virological markers might add value in monitoring the effects of peginterferon(PEG-IFN)therapy for hepatitis B e-antigen(HBeAg)positive chronic hepatitis B(CHB).Methods HBeAg positive patients with CHB were treated with PEG-IFN for 48 *** biochemical,and HBV serological indexes,as well as cytokines,were detected at baseline and every12 *** A total of 116 patients with CHB were enrolled in this study;100 patients completed the 48-week treatment and follow-up,of whom 38 achieved serum HBeAg disappearance,25 achieved HBeAg seroconversion,37 showed HBsAg decreases≥1 log10 IU/mL,9 showed HBsAg disappearance,and 8became HBsAb *** cytokine levels at baseline and during treatment were similar between the HBeAg disappearance group and non-disappearance *** disappearance of HBeAg was independently associated with HBeAg levels at weeks 12 and 24,and with the HBeAg decline at week 24(P<0.05).The HBsAg response was independently associated with HBsAg,the HBsAg decline,HBeAg,the HBeAg decline at week 12,and HBsAg at week 24(P<0.05).Conclusion There was no significant correlation between the response to interferon(IFN)and cytokines during PEG-IFN *** changes in virological markers predicted the response to IFN after 48 weeks.

关键词： Chronic hepatitis B Cytokine Peginterferon HBsAg HBeAg

Synergistic Interdecadal Evolution of Precipitation over Eastern China and the Pacific Decadal Oscillation during 1951-2015

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Advances in Atmospheric Sciences 2024年第1期41卷 53-72页

作者： Minmin WU rong-Hua ZHANG Junya HU hai ZHI Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China School of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 210044China Laosan Laboratory Qingdao 266237China School of Atmospheric Sciences Nanjing University of Information Science and TechnologyNanjing 210044China University of Chinese Academy of Sciences Beijing 100029China

By using the multi-taper method(MTM)of singular value decomposition(SVD),this study investigates the interdecadal evolution(10-to 30-year cycle)of precipitation over eastern China from 1951 to 2015 and its relationship with the North Pacific sea surface temperature(SST).Two significant interdecadal signals,one with an 11-year cycle and the other with a 23-year cycle,are identified in both the precipitation and SST *** show that the North Pacific SST forcing modulates the precipitation distribution over China through the effects of the Pacific Decadal Oscillation(PDO)-related anomalous Aleutian low on the western Pacific subtropical high(WPSH)and Mongolia high(MH).During the development stage of the PDO cold phase associated with the 11-year cycle,a weakened WPSH and MH increased the precipitation over the Yangtze River Basin,whereas an intensified WPSH and MH caused the enhanced rain band to move northward to North China during the decay *** the development stage of the PDO cold phase associated with the 23-year cycle,a weakened WPSH and MH increased the precipitation over North China,whereas an intensified WPSH and the weakened MH increased the precipitation over South China during the decay *** 11-year and 23-year variabilities contribute differently to the precipitation variations in the different regions of China,as seen in the 1998flooding *** 11-year cycle mainly accounts for precipitation increases over the Yangtze River Basin,while the 23-year cycle is responsible for the precipitation increase over Northeast *** results have important implications for understanding how the PDO modulates the precipitation distribution over China,helping to improve interdecadal climate prediction.

关键词： MTM-SVD PDO SST anomalies interdecadal variability precipitation over China

Dynamics of a Reaction-diffusion-ODE System in a Heterogeneous Media

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 275-301页

作者： Cong-hui ZHANG hai-feng ZHANG Mei-rong ZHANG School of Science Beijing University of Civil Engineering and ArchitectureBeijing 102616China Institute of Applied System Analysis Jiangsu UniversityZhenjiang 212013China Department of Mathematical Sciences Tsinghua UniversityBeijing 100084China

The existence and stability of stationary solutions for a reaction-diffusion-ODE system are investigated in this *** first show that there exist both continuous and discontinuous stationary *** a good understanding of the stability of discontinuous stationary solutions is gained under an appropriate *** addition,we demonstrate the influences of the diffusion coefficient on stationary *** results we obtained are based on the super-/sub-solution method and the generalized mountain pass ***,some numerical simulations are given to illustrate the theoretical results.

关键词： reaction-diffusion-ODE system discontinuous stationary solutions stability asymptotic behavior monotone solutions

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Energy-information trade-off induces continuous and discontinuous phase transitions in lateral predictive coding

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Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 79-85页

作者： Zhen-Ye huang Ruyi Zhou Miao huang hai-Jun Zhou Key Laboratory for Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China Minjiang Collaborative Center for Theoretical Physics Minjiang UniversityFuzhou 350108China

Lateral predictive coding is a recurrent neural network that creates energy-efficient internal representations by exploiting statistical regularity in sensory ***,we analytically investigate the trade-off between information robustness and energy in a linear model of lateral predictive coding and numerically minimize a free energy *** observed several phase transitions in the synaptic weight matrix,particularly a continuous transition that breaks reciprocity and permutation symmetry and builds cyclic dominance and a discontinuous transition with the associated sudden emergence of tight balance between excitatory and inhibitory *** optimal network follows an ideal gas law over an extended temperature range and saturates the efficiency upper bound of energy *** results provide theoretical insights into the emergence and evolution of complex internal models in predictive processing systems.

关键词： predictive coding recurrent neural network phase transition internal model free energy

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Design optimization of a hexapod vibration isolation system for electro-optical payload

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Chinese Journal of Aeronautics 2024年第2期37卷 330-342页

作者： Jing LI Weipeng LI Xiaoyan ZHANG hai huang School of Astronautics Beihang UniversityBeijing 100191China

The electro-optical payloads on mobile platforms generally suffer undesirable vibrations generated by maneuvers and *** vibrations are in six degrees of freedom and cause line-of-sight jitters,resulting in image blurring and loss of tracking *** this paper,a Hexapod Vibration Isolation System(HVIS)is proposed and optimized to solve this *** optimization aims to centralize and minimize the natural frequencies of HVIS,for expanding the vibration isolation bandwidth and improving the vibration isolation in the higher frequency *** that the design space for HVIS is limited and interfered with the frames of the mobile platform,a non-collision algorithm is proposed and applied in the optimization to obtain the feasible optimal *** optimization result shows that the natural frequency bandwidth has been reduced by 42.9%,and the maximum natural frequency is reduced by 30.2%.The prototypes of initial and optimal designs are manufactured and *** simulated and experimental results demonstrate the validity of the optimization,and the optimal design provides a maximum of 15 dB more isolation in rotation direction than the initial design.

关键词： Electro-optical payload Vibrations Isolation system Hexapod Optimization Non-collision design

Salinity effect-induced ENSO amplitude modulation in association with the interdecadal Pacific Oscillation

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Journal of Oceanology and Limnology 2024年第4期42卷 1019-1036页

作者： hai ZHI Xiaokun WANG rong-Hua ZHANG Pengfei LIN Jifeng QI College of Atmospheric Sciences Nanjing University of Information Science and TechnologyNanjing 210044China School of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 210044China Laoshan Laboratory Qingdao 266237China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric Physics(IAP)Chinese Academy of SciencesBeijing 100029China Key Laboratory of Ocean Circulation and Waves Institute of Oceanologyand Center for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China

A 110-year ensemble simulation of an ocean general circulation model(OGCM)was analyzed to identify the modulation of salinity interdecadal variability on El Niño-Southern Oscillation(ENSO)amplitude in the tropical Pacific during *** simulating results show that sea surface salinity(SSS)variation in the region exhibits notable and coherent interdecadal variability signal,which is closely associated with the Interdecadal Pacific Oscillation(IPO).As salinity increases or reduces,the SSS modulations on ENSO amplitude during its warm/cold events vary asymmetrically with positive/negative IPO ***,salinity interdecadal variability can enhance or reduce ENSO-related conditions in upper-ocean stratification,contributing noticeably to ENSO *** anomalies associated with the mixed layer depth and barrier layer thickness can modulate ENSO amplitude during positive and negative IPO phases,resulting in the asymmetry of sea surface temperature(SST)anomaly in the tropical *** positive IPO phases,SSS interdecadal variability contributes positively to El Niño amplitude but negatively to La Niña amplitude by enhancing or reducing SSS interannual variability,and vice versa during negative IPO ***,the results indicate that the modulation of the ENSO amplitude by the SSS interdecadal variability is 15%-28%during negative IPO phases and 30%-20%during positive IPO phases,***,the SSS interdecadal variability associated with IPO and its modulation on ENSO amplitude in the tropical Pacific are among factors essentially contributing ENSO diversity.

关键词： El Niño-Southern Oscillation(ENSO)amplitude Interdecadal Pacific Oscillation(IPO) ocean salinity variability tropical Pacific upper-ocean stratification