检索结果-南通市图书馆

Simulation of Daily Diffuse Solar Radiation Based on Three Machine Learning Models

Computer Modeling in Engineering & Sciences 2020年第4期123卷 49-73页

作者： Jianhua Dong Lifeng Wu Xiaogang Liu Cheng Fan menghui leng Qiliang Yang Faculty of Agriculture and Food Kunming University of Science and TechnologyKunming650500China School of Hydraulic and Ecological Engineering Nanchang Institute of TechnologyNanchang330099China Jiangxi Key Laboratory of Hydrology-Water Resources and Water Environment Nanchang Institute of TechnologyNanchang330099China.

Solar radiation is an important parameter in the fields of computer modeling,engineering technology and energy *** paper evaluated the ability of three machine learning models,i.e.,Extreme Gradient Boosting(XGBoost),Support Vector Machine(SVM)and Multivariate Adaptive Regression Splines(MARS),to estimate the daily diffuse solar radiation(Rd).The regular meteorological data of 1966-2015 at five stations in China were taken as the input parameters(including mean average temperature(Ta),theoretical sunshine duration(N),actual sunshine duration(n),daily average air relative humidity(RH),and extra-terrestrial solar radiation(Ra)).And their estimation accuracies were subjected to comparative *** three models were first trained using meteorological data from 1966 to ***,the 2001-2015 data was used to test the trained machine learning *** results show that the XGBoost had better accuracy than the other two models in coefficient of determination(R2),root mean square error(RMSE),mean bias error(MBE)and normalized root mean square error(NRMSE).The MARS performed better in the training phase than the testing phase,but became less accurate in the testing phase,with the R2 value falling by 2.7-16.9%on *** contrast,the R2 values of SVM and XGBoost increased by 2.9-12.2%and 1.9-14.3%,*** trailing slightly behind the SVM at the Beijing station,the XGBoost showed good performance at the rest of the stations in the two *** the training phase,the accuracy growth is small but *** addition,the XGBoost had a slightly lower RMSE than the SVM,a signal of its edge in ***,the three machine learning models can estimate the daily Rd based on local inputs and the XGBoost stands out for its excellent performance and stability.

关键词： Diffuse solar radiation extreme gradient boosting multivariate adaptive regression splines statistical indices support vector machine

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

透水混凝土抗冻性能研究进展

引用

混凝土 2021年第5期 51-55,60页

作者：向君正桂发亮冷梦辉南昌工程学院水利与生态工程学院江西南昌330099

在严寒地区,冻融破坏是透水混凝土路面所面临的一大耐久性问题。针对这个问题,综述了透水混凝土冻融试验方法、抗冻性能影响因素、抗冻性能优化研究,并对除冰盐加速混凝土冻融破坏进行了概述。在此基础上提出了对透水混凝土冻融问题进... 详细信息

在严寒地区,冻融破坏是透水混凝土路面所面临的一大耐久性问题。针对这个问题,综述了透水混凝土冻融试验方法、抗冻性能影响因素、抗冻性能优化研究,并对除冰盐加速混凝土冻融破坏进行了概述。在此基础上提出了对透水混凝土冻融问题进一步的研究建议,为透水混凝土研究人员及实际工程提供借鉴。

关键词：透水混凝土冻融破坏试验方法抗冻性能盐冻

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

透水混凝土冻融剥蚀成因分析

引用

硅酸盐通报 2021年第7期40卷 2215-2224页

作者：向君正宋慧冷梦辉桂发亮南昌工程学院水利与生态工程学院南昌330099 南昌工程学院江西省水利土木工程基础设施安全重点实验室南昌330099

为探究透水混凝土冻融剥蚀是否来自水泥浆体劣化,选取2.5~10.0 mm粒径骨料,制备了水灰比为0.31的透水混凝土及同水灰比的水泥石,测量二者冻融循环下质量、强度及透水混凝土相对动弹性模量变化。采用压汞法(MIP)测量水泥石冻融循环下孔... 详细信息

为探究透水混凝土冻融剥蚀是否来自水泥浆体劣化,选取2.5~10.0 mm粒径骨料,制备了水灰比为0.31的透水混凝土及同水灰比的水泥石,测量二者冻融循环下质量、强度及透水混凝土相对动弹性模量变化。采用压汞法(MIP)测量水泥石冻融循环下孔结构特征参数及孔径分布变化,并通过扫描电镜(SEM)观察透水混凝土骨料水泥界面形貌演变。结果表明,在水冻与盐冻环境下透水混凝土宏观性能指标均有不同程度下降,骨料水泥界面产生裂缝并随冻融次数增加不断扩展,而水泥石强度、质量及微观孔隙结构均无明显变化。这表明透水混凝土冻融劣化与骨料水泥界面劣化相关。

关键词：透水混凝土水泥石冻融循环劣化规律骨料水泥界面

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

骨料粒径对透水混凝土超声波波速影响

引用

混凝土 2022年第10期 106-111页

作者：向君正宋慧冷梦辉桂发亮河海大学水利水电学院江苏南京210098 南昌工程学院水利与生态工程学院江西南昌330099 南昌工程学院江西省水利土木工程基础设施安全重点实验室江西南昌330099

基于透水混凝土骨料级配与含量的特殊性,为了解骨料粒径对透水混凝土超声波波速的影响。分别选取2.5~6、6~10、10~16、16~20 mm粒径范围骨料,制备0.25~0.34水灰比范围透水混凝土。测量其透水系数、有效孔隙率、抗压强度以及超声波波速... 详细信息

基于透水混凝土骨料级配与含量的特殊性,为了解骨料粒径对透水混凝土超声波波速的影响。分别选取2.5~6、6~10、10~16、16~20 mm粒径范围骨料,制备0.25~0.34水灰比范围透水混凝土。测量其透水系数、有效孔隙率、抗压强度以及超声波波速。对比分析不同粒径范围透水混凝土超声波波速与水灰比及性能指标间的关系。结果表明,同一粒径范围,超声波波速与抗压强度呈正相关关系,与透水系数呈负相关关系。超声波波速随透水混凝土骨料粒径增大而增大,并从介质分界面角度对透水混凝土截面图像分析解释了这一现象。最后通过试验结果与现有文献进行对比分析,讨论了骨料对透水混凝土与普通混凝土波速测量间差异。

关键词：透水混凝土超声波波速骨料粒径介质分界面强度透水系数

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

洪水基流分割非参数检验方法优选

引用

水资源保护 2021年第4期37卷 82-88页

作者：冷梦辉白桦李二辉向君正黄监初桂发亮南昌工程学院江西省水文水资源与水环境重点实验室江西南昌330099 江西省宜春水文局江西宜春336000

基于江西省萍乡市五丰河流域2016—2018年实测场次洪水数据和直线斜割法所得基流流量,对比分析累积距平法、Pettitt法、滑动T检验法和Mann-Kendall检验法应用于基流分割的适用性和准确性,选择集对分析法为优选非参数检验方法。结果表明... 详细信息

基于江西省萍乡市五丰河流域2016—2018年实测场次洪水数据和直线斜割法所得基流流量,对比分析累积距平法、Pettitt法、滑动T检验法和Mann-Kendall检验法应用于基流分割的适用性和准确性,选择集对分析法为优选非参数检验方法。结果表明:海绵城市建设后(2018年)相对建设前(2016年)标准退水曲线基流流量增加65.2%,地下径流量增加47.3%,地下径流量占径流总量比例增加53%。Pettitt法与直线斜割法所得基流流量相对误差最小,年均相对误差为1.7%;变差系数年均相对误差最小,为5%;集对分析联系度最大,为0.81。Pettitt方法是检验海绵城市直接地表和地下二元径流成分转化的最适非参数检验法。

关键词：基流分割场次洪水海绵城市非参数检验法集对分析直线斜割法

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Copula函数的海绵城市日气温设计

引用

水利水电技术 2019年第7期50卷 1-12页

作者：冷梦辉宋伟俊白桦桂发亮宋慧向君正南昌工程学院江西省水文水资源与水环境重点实验室江西南昌330099 中国铁建大桥工程局集团有限公司天津300300

极端温度和温差影响混凝土微观结构特征和力学性能,气温被视作混凝土施工维养的重要设计依据。基于中国819个气象站1961—2015年日气象和地理信息资料,采用地统计方法和Copula函数对海绵城市进行气象分区,分析分区日均温和日温差边际、... 详细信息

极端温度和温差影响混凝土微观结构特征和力学性能,气温被视作混凝土施工维养的重要设计依据。基于中国819个气象站1961—2015年日气象和地理信息资料,采用地统计方法和Copula函数对海绵城市进行气象分区,分析分区日均温和日温差边际、联合概率分布,设计日均温、日温差和相应混凝土抗压强度。结果表明:海绵城市气象分区与行政分区一致;各分区日均温和日温差多服从正态分布,冬、夏日均温期望值在0~13.6℃和23.2~26.4℃间变化、标准差在3.2~5.4℃和2.5~3.5℃间变化,冬、夏日温差期望值在7.4~12.1℃和7.4~11.8℃间变化、标准差在2.9~3.7℃和1.8~3.4℃间变化;日均温和日温差联合概率分布冬季对称,夏季不对称,相应AMH Copula函数参数值分别在-5.68×10^-6~4.93×10^-6和-6.37×10^-6~4.89×10^-6间变化;冬季,东北、华北和西北分区设计频率分别处于50%、5%、5%,低于国标设计温度,设计出的混凝土无法达到抗冻要求,其余分区设计频率在国标设计温度内满足设计要求;夏季,各分区日均温均高于混凝土国标养护温度,易使得混凝土内外温度失调而产生热胀破坏。设计的极端温度、温差及抗压强度是对现有国标混凝土养护温度的补充和完善,为海绵城市新性能混凝土构建提供科学依据。

关键词：海绵城市混凝土日均温日温差 Copula函数

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

CNKSR2 interactome analysis indicates its association with the centrosome/microtubule system

引用

Neural Regeneration Research 2025年第8期20卷 2420-2432页

作者： Lin Yin Yalan Xu Jie Mu Yu leng Lei Ma Yu Zheng Ruizhi Li Yin Wang Peifeng Li Hai Zhu Dong Wang Jing Li Institute for Translational Medicine The Affiliated Hospital of Qingdao UniversityMedical CollegeQingdao UniversityQingdaoShandong ProvinceChina School of Basic Medicine Qingdao UniversityQingdaoShandong ProvinceChina College of Life Sciences and School of PharmacyMedical CollegeQingdao UniversityQingdaoShandong ProvinceChina Department of Urology Qingdao Municipal Hospital Affiliated to Qingdao UniversityQingdaoShandong ProvinceChina

The protein connector enhancer of kinase suppressor of Ras 2(CNKSR2),present in both the postsynaptic density and cytoplasm of neurons,is a scaffolding protein with several protein-binding *** of the CNKSR2 gene have been implicated in neurodevelopmental disorders,particularly intellectual disability,although the precise mechanism involved has not yet been fully *** has demonstrated that CNKSR2 plays a role in facilitating the localization of postsynaptic density protein complexes to the membrane,thereby influencing synaptic signaling and the morphogenesis of dendritic ***,the function of CNKSR2 in the cytoplasm remains to be *** this study,we used immunoprecipitation and high-resolution liquid chromatography-mass spectrometry to identify the interactors of *** a combination of bioinformatic analysis and cytological experiments,we found that the CNKSR2 interactors were significantly enriched in the proteome of the *** also showed that CNKSR2 interacted with the microtubule protein DYNC1H1 and with the centrosome marker *** colocalization analysis confirmed the centrosomal localization of *** we downregulated CNKSR2 expression in mouse neuroblastoma cells(Neuro 2A),we observed significant changes in the expression of numerous centrosomal *** manipulation also affected centrosome-related functions,including cell size and shape,cell proliferation,and ***,we found that CNKSR2 interactors were highly enriched in de novo variants associated with intellectual disability and autism spectrum *** findings establish a connection between CNKSR2 and the centrosome,and offer new insights into the underlying mechanisms of neurodevelopmental disorders.

关键词： autism spectrum disorder centrosome CNKSR2 intellectual disability interactome mass spectrometry microtubule neurodevelopmental disease protein complexes protein-protein interactions

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

Progress in numerical modeling of subducting plate dynamics

引用

Science China Earth Sciences 2018年第12期61卷 1761-1774页

作者： Wei leng Liangzhi HUANG School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China National Geophysical Observatory at Mengcheng Hefei 230026China

The core concerns of plate tectonics theory are the dynamics of subducting plates, which can be studied by integrating multidisciplinary fields such as seismology, mineral physics, rock geochemistry, geological formation studies, sedimentology,and numerical simulations. By establishing a theoretical model and solving it with numerical methods, one can replicate the dynamic effects of a subducting plate, quantifying its evolution and the surface response. Simulations can also explain the observations and experimental results of other disciplines. Therefore, numerical models are among the most important tools for studying the dynamics of subducting plates. This paper provides a review on recent advances in the numerical modeling of subducting plate dynamics. It covers various aspects, namely, the origin of plate tectonics, the initiation process and thermal structure of subducting slab, and the main subduction slab dynamics in the upper mantle, mantle transition zone, and lower mantle. The results of numerical models are based on the theoretical equations of mass, momentum, and energy conservation. To better understand the dynamic progress of subducting plates, the simulation results must be verified in comparisons with the results from natural observations by geology, geophysics and geochemistry. With the substantial increase in computing power and continuous improvement of simulation methods, numerical models will become a more accurate and efficient means of studying the frontier issues of Earth sciences, including subducting plate dynamics.

关键词： Subducting plate Dynamics Numerical simulation

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

Progress in the numerical modeling of mantle plumes

引用

Science China Earth Sciences 2023年第4期66卷 685-702页

作者： Wei leng Hao LIU Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China State Key Laboratory of Geological Processes and Mineral Resources School of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China CAS Center for Excellence in Comparative Planetology Hefei 230026China

The mantle plume model, as an integral part of the Earth’s internal convection system, is complementary to the theory of plate tectonics. They together constitute the key configuration of material circulation and energy transport in the Earth’s interior. Seismology, high-temperature and high-pressure mineralogy, geology, and geodynamic numerical modeling have conducted comprehensive studies on the mantle plume model since it was proposed. In particular, numerical simulation, which investigates the dynamic processes of mantle plumes by establishing a theoretical model, provides a quantitative description of possible mantle plume evolution and the responses of the Earth’s interior and surface, which can be used to explain observations and experimental results from other disciplines. Thus, it is one of the most important means to study plume dynamics. This paper summarizes the research progress in numerical modeling of mantle plumes in past decades, including the origin of mantle plumes, seismological evidence for the existence of plumes, interactions between mantle plumes and the lithosphere, mid-ocean ridges, subduction zones, and the mantle transition zone, as well as the relationship between plumes and large low shear wave velocity provinces. The theoretical results of numerical modeling combined with observations from other disciplines enable us to deeply understand the dynamic process of mantle plumes. With the continuing development of numerical methodology and the improvement of high-performance computing, geodynamic numerical modeling will become a more accurate and efficient approach for studying mantle plume dynamics and related frontier problems in geosciences.

关键词： Mantle plume Dynamics Numerical modeling

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

Mathematical method in optical molecular imaging

引用

Science China(Information Sciences) 2015年第3期58卷 4-16页

作者： leng ChengCai TIAN Jie School of Mathematics and Information Sciences Nanchang Hangkong University Key Laboratory of Molecular Imaging Institute of Automation Chinese Academy of Sciences

Optical molecular imaging is an important technique of studies at molecular level and provides promising tools to non-invasively delineate in vivo physiological and pathological activities at cellular and molecular levels,and it has been widely used for diagnosing,managing diseases,metastasis detection and drug *** a mathematical perspective,this paper mainly focuses on the forward problem and inverse problem in biological tissues based on the radiative transfer equation(RTE).The forward problem is accustomed to describing photon propagation in biological tissues and the inverse problem is used to reconstruct internal source distribution from the signal detected on the external *** also introduce the detailed derivation of the RTE and Robin boundary condition and discretization of the forward problem,along with the reconstruction methods and iterative solution algorithms summarized for the inverse ***,the current and future challenges of optical molecular imaging are *** survey aims to construct a mathematical method,a state-of-the-art framework for optical molecular imaging,from which future research may benefit.

关键词： radiative transfer equation(RTE) regularization method source reconstruction optical molecular imaging mathematical method

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

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：