检索结果-南通市图书馆

CFD-Based Load Calculation Method for Monopile Support Configuration of Offshore Wind Turbine

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2016年第1期33卷 88-94页

作者： Guo tongqing tong xiaolong Lu Zhiliang College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China Shenyang Aircraft Design&Research Institute Shenyang 110035P.R.China

An unsteady load calculation method for the support configuration of a monopile-supported offshore wind turbine is developed based on the Fluent software ***,the water wave is generated by imposing the inlet boundary conditions according to the exact potential flow *** the wave evolution is simulated by solving the unsteady incompressible Navier-Stokes(N-S)equations coupled with the volume of fluid *** the small amplitude wave with reasonable wave parameters,the numerical wave result agrees well with that of the given wave ***,a monopile support configuration is introduced and a CFD-based load calculation method is established to accurately calculate the unsteady load under the combined action of wave and *** computed unsteady wave load on a small-size monopile support located in the small amplitude wave flow coincides with that of the Morison *** load calculations are also performed on a large-size monopile support and a monopile-supported offshore wind turbine under the combined action of small amplitude wave and wind.

关键词： monopile-supported offshore wind turbine Navier-Stokes(N-S)equations volume of fluid(VOF) method small amplitude wave unsteady load

Transformer Partial Discharge Monitoring Based on Optical Fiber Sensing

在线全文

学校读者我要写书评

暂无评论

Photonic Sensors 2014年第2期4卷 137-141页

作者： Kun WANG Xinglin tong xiaolong ZHU National Engineering Laboratory for Fiber Optic Sensing Technology Wuhan University of Technology Wuhan430070 China

The power transformer is the most important equipment of the high voltage power grid, however, some traditional methods of online partial discharge monitoring have some limitations. Based on many advantages of the optical fiber sensing technology, we have done some research on fiber optics Fabry-Perot （FP） sensing which can be useful for the transformer on online partial discharge monitoring. This research aimed at improving the reliability of power system safety monitoring. We have done some work as follows： designing a set for fiber optics FP sensor preparation, according to the fabrication procedure strictly making out the sensors, building a reasonable signal demodulation system for fiber optics FP sensing, doing a preliminary analysis about online partial discharge signal monitoring, including the research on different discharge intensities with the same measuring distance and different measuring distances with the same discharge intensity, and then making a detailed analysis of the experimental results.

关键词： Partial discharge fiber FP sensor diaphragm effective reflectivity

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

飞机液压导管装配偏差有限元仿真分析

飞机设计 2024年第4期44卷 40-44页

作者：周立洋佟晓龙于永鹏沈阳飞机设计研究所辽宁沈阳110035

液压管路性能直接影响了飞机液压系统的安全性、可靠性及维修性,在实际装配连接过程中,不可避免的会出现装配偏差的现象,文中以合金钢和钛合金导管为对象,针对其在第三类装配偏差存在的情况下,对2种导管的装配过程及考虑装配应力影响的... 详细信息

液压管路性能直接影响了飞机液压系统的安全性、可靠性及维修性,在实际装配连接过程中,不可避免的会出现装配偏差的现象,文中以合金钢和钛合金导管为对象,针对其在第三类装配偏差存在的情况下,对2种导管的装配过程及考虑装配应力影响的导管爆破强度进行了仿真分析,并在此基础之上,进一步对考虑大角度安装偏差的钛合金导管装配应力,及爆破强度进行了计算,分析了装配应力及装配偏差对液压导管爆破强度的影响,为钛合金液压导管连接安装设计提供技术指导。

关键词：液压导管安装偏差有限元分析结构强度

基于电性参数和GA-BP神经网络的砂岩孔渗预测

在线全文

学校读者我要写书评

暂无评论

重庆科技学院学报（自然科学版） 2024年第2期26卷 31-38页

作者：阮家驹向葵童小龙王星皓何方长江大学地球物理与石油资源学院武汉434023

以地表岩性复杂的四川盆地为采样区,基于神经网络可解决电性参数与储层物性参数之间非线性映射问题的优势性能,讨论低孔低渗致密储层的砂岩孔渗预测方法。以密度、电阻率和极化率等电性参数作为网络模型的输入参数,利用遗传算法(GA)对B... 详细信息

以地表岩性复杂的四川盆地为采样区,基于神经网络可解决电性参数与储层物性参数之间非线性映射问题的优势性能,讨论低孔低渗致密储层的砂岩孔渗预测方法。以密度、电阻率和极化率等电性参数作为网络模型的输入参数,利用遗传算法(GA)对BP神经网络(BPNN)的权值和阈值进行优化,进而建立并训练GA-BP神经网络模型。与传统的多元回归法相比,GA-BP神经网络模型的孔渗预测实验结果更优。

关键词：电性参数 BP神经网络遗传算法砂岩孔隙度渗透率

在线全文

学校读者我要写书评

暂无评论

混凝土剪力墙受剪承载力可靠度分析

湖南大学学报（自然科学版） 2020年第5期47卷 14-22页

作者：童小龙方志湖南大学土木工程学院湖南长沙410082 湖南理工学院土木建筑工程学院湖南岳阳414006

针对我国规范未对剪力墙受剪承载力可靠指标进行校准,本文研究钢筋混凝土剪力墙受剪承载力的可靠度水平.根据剪力墙抗剪公式所依据的试验及试件情况,收集并筛选截面型式、混凝土类型、配筋型式、破坏形态等方面与其一致的74片剪力墙试... 详细信息

针对我国规范未对剪力墙受剪承载力可靠指标进行校准,本文研究钢筋混凝土剪力墙受剪承载力的可靠度水平.根据剪力墙抗剪公式所依据的试验及试件情况,收集并筛选截面型式、混凝土类型、配筋型式、破坏形态等方面与其一致的74片剪力墙试验数据,对试件承载力的试验值与规范公式计算值进行分析,得出剪力墙受剪承载力计算模式不定性统计参数,进而得出抗力统计参数和概率分布类型;采用考虑基本变量概率分布类型的验算点法进行可靠指标计算.结果表明:现行规范剪力墙受剪承载力可靠指标低于目标可靠指标3.7的要求,其中荷载效应比、剪跨比、轴向压力、配筋率、混凝土强度等级对可靠指标影响较小,风荷载与永久荷载效应比对可靠指标影响较大,分布钢筋采用HPB300时的可靠指标在同等条件下较小.为保证剪力墙受剪承载力可靠指标满足目标可靠指标要求,引入承载力调整系数0.95对现行计算公式进行修正,修正后计算公式的可靠指标均值为3.738.

关键词：钢筋混凝土剪力墙受剪承载力计算模式不定性可靠度

The stability safety factor calibration based on the reliability index

在线全文

学校读者我要写书评

暂无评论

Engineering Sciences 2014年第3期12卷 65-69页

作者： tong xiaolong Fang Zhi College of Civil Engineering Hunan University Changsha 410082 China School of Civil Engineering Hunan Institute of Science and Technology Yueyang Hunan 414006 China

When the bridge structure stability safety factor of the first type is 4, the research that whether the structure reliability index will reach target reliability index under the more-likely-to-happen collapse situation of the second type is necessary. The stability calculations of the first and the second type are made respectively for single layer and single span rigid frame bridge. Based on the critical load obtained from the stability calculation of the first type, the stability safety factor of the first type is taken as 4, and the first order reliability method is used to program and calculate the reliability index. Then, the load effect under the stability reliability index cal- culation of the first type and the critical load of the second type are employed to calculate the reliability index of the second type. The evaluation of structure stability safety factor is discussed according to reliability index. Based on the discussion above, parameter analysis of the stable critical loads of two types is made, and the in- fluence of critical load change on reliability index is researched. The result shows that stability analysis should identify collapse state; when the stability safety factor of the first type is 4, but the structure has the collapse of the second type, the reliability index cannot be ensured to reach the target reliability index under certain condi- tions.

关键词： stability safety factor reliability index rigid frame bridge

Identification and characterization of genes related to m^(6)A modification in kiwifruit using RNA-seq and ATAC-seq

在线全文

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2024年第5期10卷 1121-1133页

作者： Xiaoli Hu tong Li Changbin Xu Yanna Xu Congjun You Xinyi Li Jinli Gong xiaolong Li Xuepeng Sun Collaborative Innovation Center for Efficient and Green Production of Agriculture in Mountainous Areas of Zhejiang Province Key Laboratory of Quality and Safety Control for Subtropical Fruit and VegetableMinistry of Agriculture and Rural AffairsCollege of Horticulture ScienceZhejiang A&F UniversityHangzhouZhejiang 311300China

N6-methyladenosine(m^(6)A)RNA modification is a conserved mechanism that regulates the fate of RNA across eukaryotic *** its significance,a comprehensive analysis of m^(6)A-related genes in non-model plants,such as kiwifruit,is ***,we identified 36 m^(6)A-related genes in the kiwifruit genome according to homology and phylogenetic *** performed bioinformatics and evolutionary analyses of the writer,eraser,and reader families of m^(6)A *** of public RNA-seq data collected from samples under various biotic and abiotic stresses indicated that most m^(6)A-related genes were remarkably expressed under different *** construction of gene co-expression networks,we found significant correlations between several m^(6)A-related genes and transcription factors(TFs)as well as receptor-like genes during the development and ripening of ***,we performed ATAC-seq assays on diverse kiwifruit tissues to investigate the regulatory mechanisms of m^(6)A-related *** identified 10 common open chromatin regions that were present in at least two tissues,and these regions might serve as potential binding sites for MADS protein,C2H2 protein,and other predicted *** study offers comprehensive insights into the gene family of m^(6)A-related components in kiwifruit,which will lay foundation for exploring mechanisms of post-transcriptional regulation involved in development and adaptation of kiwifruit.

关键词： Kiwifruit N^(6)-methyladenosine Phylogenetic analysis cis-element Co-expression network

Non-radical activation of persulfate with Bi_(2)O_(3)/BiO_(1.3)I_(0.4)for efficient degradation of propranolol under visible light

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第8期142卷 57-68页

作者： Yuehua Deng Qianqian Che Yani Li Jiating Luo Xiang Gao Yan He Yiling Liu tong Liu xiaolong Zhao Xiaobin Hu Wei Zhao College of Geology and Environment Xi’an University of Science and TechnologyXi’an 710054China Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation Xi’an 710054China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China School of Life Science Huzhou UniversityHuzhou 313000China School of Materials Engineering Changshu Institute of TechnologyChangshu 215500China

Non-radical activation of persulfate(PS)by photocatalysts is an effective approach for removing organic pollutants from aqueous *** this study,a novel Bi_(2)O_(3)/BiO_(1.3)I_(0.4)heterojunction was synthesized using a facile solvothermal approach and used for the first time for non-radical activation of PS to degrade propranolol(PRO)in the presence of visible *** findings found that the degradation rate of PRO in the Bi_(2)O_(3)/BiO_(1.3)I_(0.4)/PS system was significantly increased from 19%to more than 90%within 90 min compared to the Bi_(2)O_(3)/BiO_(1.3)I_(0.4)*** indicated that the composite system exerted an excellent synergistic effect between the photocatalyst and the persulfate-based *** tests and electron paramagnetic resonance demonstrated that the non-radical pathway with singlet oxygen as the active species played a major role in the photocatalytic *** existence of photo-generated holes during the reaction could also be directly involved in the oxidation of ***,a possible PRO degradation pathway was also ***,the impacts of pH,humic acid and common anions on the PRO degradation by the Bi_(2)O_(3)/BiO_(1.3)I_(0.4)/PS were explored,and the system’s stability and reusability were also *** study exhibits a highly productive catalyst for PS activation via a non-radical pathway and provides a new idea for the degradation of PRO.

关键词： Iodine deficiency Heterojunction Persulfate(PS) Propranolol(PRO) Photocatalytic degradation

在线全文

学校读者我要写书评

暂无评论

活性粉末混凝土剪力墙抗震性能试验研究

建筑结构学报 2016年第1期37卷 21-30页

作者：童小龙方志罗肖湖南大学土木工程学院湖南长沙410082 湖南理工学院土木建筑学院湖南岳阳414006

为研究活性粉末混凝土剪力墙的抗震性能,对3个高宽比分别为1.0、1.5和2.0的剪力墙进行拟静力试验,分析了高宽比变化对活性粉末混凝土剪力墙破坏形态、承载力、滞回曲线、延性、耗能能力和刚度退化的影响规律。结果表明:活性粉末混凝土... 详细信息

为研究活性粉末混凝土剪力墙的抗震性能,对3个高宽比分别为1.0、1.5和2.0的剪力墙进行拟静力试验,分析了高宽比变化对活性粉末混凝土剪力墙破坏形态、承载力、滞回曲线、延性、耗能能力和刚度退化的影响规律。结果表明:活性粉末混凝土剪力墙承载力高,破坏形态与普通混凝土和高性能混凝土剪力墙基本相似,但裂缝分布范围更广,裂缝数量更多、更密集,高宽比对其破坏形态影响较大,墙体高宽比从1.0增大至2.0,极限位移增大2.8倍,耗能量提高3.9倍,高宽比为2.0的剪力墙延性系数大于3。采用Open Sees程序,选用分层壳单元模型对试件受力性能进行了数值模拟和参数分析。分析表明:分层壳单元模型能够较准确地模拟活性粉末混凝土剪力墙的抗震性能,高宽比和轴压比对活性粉末混凝土剪力墙承载力及极限位移影响显著,暗柱纵筋配筋率对其承载力影响较大,墙面分布钢筋对其承载力和极限位移影响较小。

关键词：活性粉末混凝土剪力墙高宽比拟静力试验有限元分析抗震性能