检索结果-南通市图书馆

Modeling Reynolds stress anisotropy invariants via machine learning

Acta Mechanica Sinica 2024年第6期40卷 50-63页

作者： Xianglin shan Xuxiang Sun Wenbo Cao weiwei Zhang Zhenhua Xia School of Aeronautics Northwestern Polytechnical UniversityXi’an710072China Department of Engineering Mechanics Zhejiang UniversityHangzhou310027China

The presentation and modeling of turbulence anisotropy are crucial for studying large-scale turbulence structures and constructing turbulence ***,accurately capturing anisotropic Reynolds stresses often relies on expensive direct numerical simulations(DNS).Recently,a hot topic in data-driven turbulence modeling is how to acquire accurate Reynolds stresses by the Reynolds-averaged Navier-Stokes(RANS)simulation and a limited amount of data from *** existing studies use mean flow characteristics as the input features of machine learning models to predict high-fidelity Reynolds stresses,but these approaches still lack robust generalization *** this paper,a deep neural network(DNN)is employed to build a model,mapping from tensor invariants of RANS mean flow features to the anisotropy invariants of high-fidelity Reynolds *** the aspects of tensor analysis and input-output feature design,we try to enhance the generalization of the model while preserving invariance.A functional framework of Reynolds stress anisotropy invariants is derived *** irreducible invariants are then constructed from a tensor group,serving as alternative input features for ***,we propose a feature selection method based on the Fourier transform of periodic *** results demonstrate that the data-driven model achieves a high level of accuracy in predicting turbulence anisotropy of flows over periodic hills and converging-diverging ***,the well-trained model exhibits strong generalization capabilities concerning various shapes and higher Reynolds *** approach can also provide valuable insights for feature selection and data generation for data-driven turbulence models.

关键词： Reynolds stress Anisotropy invariant Tensor analysis Machine learning

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

dECM restores macrophage immune homeostasis and alleviates iron overload to promote DTPI healing

引用

Regenerative Biomaterials 2024年第2期3卷 100-113页

作者： Ju Zhang Ruijuan Si Yu Gao Hui shan Qi Su Zujian Feng Pingsheng Huang Deling Kong weiwei Wang Tianjin Key Laboratory of Biomaterial Research Institute of Biomedical EngineeringChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjin300192China School of Nursing Qingdao UniversityNingde RoadShinan DistrictQingdaoShandong266071China Cancer Hospital of Tianjin Medical University North Huanhu West RoadTianjinChina The Affliated Hospital of Qingdao University 16 Jjiangsu RoadShinan DistrictQingdaoChina 5NankaiUniver aniin300071.China

Due to its highly insidious and rapid progression,deep tissue pressure injury(DTPI)is a clinical *** previous study found that DTPI may be a skeletal muscle injury dominated by macrophage immune dysfunction due to excessive iron *** extracellular matrix(dECM)hydrogel promotes skeletal muscle injury ***,its role in po-larizing macrophages and regulating iron metabolism in DTPI remains ***,porcine dECM hydrogel was prepared,and its therapeutic function and mechanism in repairing DTPI were *** stimulus of dECM hydrogel toward RAW264.7 cells resulted in a significantly higher percentage of CD2o6+macrophages and notably decreased intracellular divalent iron *** mice DTPI model,dECM hydrogel treatment promoted M1 to M2 macrophage conversion,improved iron metabolism and reduced oxidative stress in the early stage of *** the remodeling phase,the dECM hydrogel remarkably enhanced revascularization and accelerated skeletal muscle ***,the immunomodulation of dEcM hydrogels in vivo was mainly involved in the P13k/Akt signaling pathway,as revealed by GO and KEGG pathway analysis,which may ameliorate the iron deposition and promote the healing of *** findings indicate that dECM hydrogel is promising in skeletal muscle repair,inflammation resolution and tissue injury healing by effectively restoring macrophage immune homeostasis and normalizing iron metabolism.

关键词： Deep tissue pressure injury hydrogel immunomodulation tissue repair

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

Thermal stability of the spin injection in Co/Ag/Co lateral spin valves

引用

Chinese Physics B 2018年第9期27卷 495-499页

作者： Le Wang Lu-Chen Chen Wen-Yu Liu Shuo Han weiwei Wang Zhanjie Lu shan-shan Chen Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Natual Materials ＆ Micro-nano Devices Renmin University of China Beijing 100872China Department of Physics Xiamen UniversityXiamen 361005China

Spin injection, spin diffusion, and spin detection are investigated in Co/Ag/Co lateral spin valves at room *** spin accumulation signals are detected by the non-local measurement. By fitting the results to the one-dimensional diffusion equation,8.6% spin polarization of the Co/Ag interface and -180 nm spin diffusion length in Ag are *** treatment results show that the spin accumulation signal drastically decreases after 100℃ annealing, and disappears under 200℃ annealing. Our results demonstrate that, compared to the spin diffusion length, the decrease and the disappearance of the spin accumulation signal are mainly dominated by the variation of the interfacial spin polarization of the Co/Ag interface.

关键词： spin injection spin diffusion length Co/Ag contact lateral spin valve

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Pro/Engineer的注塑模标准零件库的开发

引用

计算机辅助工程 2004年第4期13卷 57-59页

作者：阎峰云张小甫单巍巍孙立平兰州理工大学有色金属新材料国家重点实验室甘肃兰州730050

论述利用Visual C++的集成开发环境(IDE)和Pro／Toolkit开发模块开发注塑模标准件库的具体过程,对创建基于Pro／Engineer的实用CAD软件系统进行了积极有效的探索。

关键词： Pro/Engineer 集成开发环境 IDE Pro/Toolkit C++ 零件库标准件库注塑模 CAD软件

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

See the color,see the seed:GmW1 as a visual reporter for transgene and genome editing in soybean

引用

The Crop Journal 2023年第1期11卷 311-315页

作者： Li Chen shan Yuan Yupeng Cai weiwei Yao Qiang Su Yingying Chen Jialing Zhang Wensheng Hou National Center for Transgenic Research in Plants Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China Ministry of Agriculture Key Laboratory of Soybean Biology(Beijing) Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China

A fast and efficient recognition method of transgenic lines will greatly improve detection efficiency and reduce *** this study,we successfully identified the transgenic soybean plants by the *** isolated a GmW1 gene encoding a flavonoid 3'5'-hydroxylase from a soybean cultivar ZH42(purple flower).We found that purple flowers occurred in the overexpression lines in the Jack and Williams 82 backgrounds(white flower).All plants with purple flowers were positive,and this trait seems stably inherited in the *** have also obtained the editing plants,which were classified into three types according to the different flower colors *** analyzed the phenotype and the homozygous types of the T_*** also found that a correspondence between flower color and stem *** study provides a visible color reporter on soybean *** can be quickly and early to identify the transgenic soybean plants by stem color of seedlings,which substantially reduces the amount of labor and cost.

关键词： Soybean GmW1 Color Transgenic lines Genome editing

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

营口百年气象站旧址出土气象档案的发掘整理及价值评价

引用

气象科技进展 2021年第2期11卷 17-20页

作者：杨晓波单薇薇徐亚琪张智超刘丙章于洋洋营口市气象局辽宁省气象信息中心

资料被掩埋在约1.5 m的地下,主要为纸质材料,有明显焚烧和破损痕迹,整个堆积层的上下层均为碳化层,中间约10 cm为未完全燃烧层。此处就是当年日本侵略者集中焚烧气象资料并掩埋的场所。

关键词：日本侵略者未完全燃烧气象档案纸质材料堆积层价值评价发掘整理碳化层

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

基于生物电阻抗矢量分析的维持性血液透析患者贫血和营养状况的评估方法研究

引用

实用临床医药杂志 2023年第15期27卷 50-55页

作者：张志坚陈涵枝李程周乐汀刘晓斌单炜薇刘斌王凉南京医科大学无锡医学中心/南京医科大学附属无锡人民医院肾内科江苏无锡214000

目的探讨基于生物电阻抗矢量分析(BIVA)和机器学习算法建立的预测模型对维持性血液透析(MHD)患者贫血和营养状况的预测价值。方法收集人体成分分析仪(BCM)测得的MHD患者生物电信号数据和白蛋白(Alb)、血红蛋白(Hb)、低密度脂蛋白胆固... 详细信息

目的探讨基于生物电阻抗矢量分析(BIVA)和机器学习算法建立的预测模型对维持性血液透析(MHD)患者贫血和营养状况的预测价值。方法收集人体成分分析仪(BCM)测得的MHD患者生物电信号数据和白蛋白(Alb)、血红蛋白(Hb)、低密度脂蛋白胆固醇(LDL-C)、总胆固醇(TC)等血生化指标数据,基于BIVA和3种机器学习算法(随机森林、支持向量机和Adaboost算法)分别建立3个预测模型,比较3个模型对Alb、LDL-C、Hb、TC指标的预测效能。结果个体相关性分析结果显示,生物电学指标与营养指标(Alb、LDL-C、Hb、TC)显著相关(P<0.05或P<0.01);3个模型中,基于随机森林算法的模型性能最佳,预测Alb、LDL-C、Hb、TC的准确率分别为0.880、0.879、0.904、0.937。结论基于BIVA和机器学习算法(随机森林算法)建立的预测模型在MHD患者贫血和营养状况评估中具有较高价值,可辅助临床决策。

关键词：终末期肾病血液透析生物电阻抗矢量分析随机森林贫血营养状况

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

Plastics-to-syngas photocatalysed by Co-Ga2O3 nanosheets

引用

National Science Review 2022年第9期9卷 230-237页

作者： Jiaqi Xu Xingchen Jiao Kai Zheng weiwei Shao shan Zhu Xiaodong Li Junfa Zhu Yang Pan Yongfu Sun Yi Xie Hefei National Laboratory for Physical Sciences at Microscale National Synchrotron Radiation Laboratory University of Science and Technology of China Key Laboratory of Green Chemistry &Technology Ministry of Education College of Chemistry Sichuan University Institute of Energy Hefei Comprehensive National Science Center

Plastics take hundreds of years to degrade naturally,while their chemical degradation typically requires high temperature and ***,we first utilize solar energy to realize the sustainable and efficient plastic-to-syngas conversion with the aid of water at ambient *** an example,the commercial plastic bags could be efficiently photoconverted into renewable syngas by Co-Ga2O3nanosheets,with hydrogen and carbon monoxide formation rates of 647.8 and 158.3μmol *** situ characterizations and labelling experiments unveil water is photoreduced into hydrogen,while non-recyclable plastics including polyethylene bags,polypropylene boxes and polyethylene terephthalate bottles are photodegraded into carbon dioxide,which is further selectively photoreduced into carbon ***-depth investigation illustrates that the efficiency of syngas production mainly depends on the carbon dioxide reduction process and hence photo catalysts of high carbon dioxide reduction activity should be designed to promote the efficiency of plastic-to-syngas conversion in the *** concept for the photoreforming of non-recyclable plastics into renewable syngas helps to eradicate ’white pollution’ and alleviate the energy crisis simultaneously.

关键词： commercial plastics syngas photoconversion CO2 reduction ambient conditionsion

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

马铃薯抗晚疫病基因研究进展

引用

山东农业科学 2013年第1期45卷 141-146页

作者：于耀华单伟伟杨煜刘芳陈广侠郭宝太郭晓李广存青岛农业大学生命科学学院山东青岛266109 山东省农业科学院蔬菜研究所/国家蔬菜改良中心山东分中心/山东省设施蔬菜分子生物学重点实验室山东济南250100

马铃薯晚疫病是马铃薯的第一大病害。利用分子生物学和基因工程技术,从马铃薯野生种质资源中分离抗病基因,并将其转化到优良栽培品种中,是提高马铃薯晚疫病抗性高效快捷的方法之一,目前已有多个来自不同野生种质资源中的晚疫病抗性基因... 详细信息

马铃薯晚疫病是马铃薯的第一大病害。利用分子生物学和基因工程技术,从马铃薯野生种质资源中分离抗病基因,并将其转化到优良栽培品种中,是提高马铃薯晚疫病抗性高效快捷的方法之一,目前已有多个来自不同野生种质资源中的晚疫病抗性基因被分离或定位。本文主要概述了近年来马铃薯抗晚疫病基因的研究现状。

关键词：马铃薯晚疫病抗性基因

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

核电仪控设备的5G改造及应用研究

引用

中国核电 2024年第4期17卷 494-499页

作者：彭伟伦吴广皓单巍伟肖安洪曾辉王娇关晖孙国伟骆琼刚中国核动力研究设计院核反应堆系统设计技术重点实验室四川成都610213

该文选取核电环境监测系统(KRS)进行5G改造研究。通过研制具有透传功能的5G终端,实现核电环境监测数据通过5G信号接入主控室NC级DCS系统,并就现场环境进行试验,对设备穿透能力、抗干扰能力、干扰度等进行实际测量。试验结果表明,该5G改... 详细信息

该文选取核电环境监测系统(KRS)进行5G改造研究。通过研制具有透传功能的5G终端,实现核电环境监测数据通过5G信号接入主控室NC级DCS系统,并就现场环境进行试验,对设备穿透能力、抗干扰能力、干扰度等进行实际测量。试验结果表明,该5G改造方案适用于采集类、透传类核电仪控设备改造,为现有仪控设备数字化改造提出了新的解决思路。

关键词： 5G 仪控设备改造环境监测数据通信核电协议

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

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：