检索结果-南通市图书馆

Experimental Study of Local Scour Around Four Piles Under Different Attack Angles and Gap Ratios

China Ocean Engineering 2024年第4期38卷 612-624页

作者： LIU Ming-ming tang guo-qiang JIN Xin GENG Shao-yang School of Architecture and Engineering Liaocheng UniversityLiaocheng 252000China Water-Sediment Regulation and Sand Effective Utilization Special Laboratory of Shandong Provincial Education Department Liaocheng UniversityLiaocheng 252000China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China College of Electronic Engineering Chengdu University of Information TechnologyChengdu 610225China College of Energy Chengdu University of TechnologyChengdu 610059China

In an effort to investigate and quantify the patterns of local scour,researchers embarked on an in-depth study using a systematic experimental *** research focused on the effects of local scour around a set of four piles,each subjected to different hydromechanical *** particular,this study aimed to determine how different attack angles—the angles at which the water flow impinges on the piles,and gap ratios—the ratios of the spacing between the piles to their diameters,influence the extent and nature of scour.A comprehensive series of 35 carefully designed experiments were orchestrated,each designed to dissect the nuances in how the gap ratio and attack angle might contribute to changes in the local scour observed at the base of pile *** these experimental trials,a wealth of local scour data were collected to support the *** data included precise topographic profiles of the sediment bed around the pile groups,as well as detailed scour time histories showing the evolution of scour at strategic feature points throughout the test *** analysis of the experimental data provided interesting *** study revealed that the interplay between the gap ratio and the attack angle had a pronounced influence on the scouring dynamics of the pile *** of the key observations was that the initial phases of scour,particularly within the first hour of water flow exposure,were characterized by a sharp increase in the scour depth occurring immediately in front of the *** this initial rapid development,the scour depth transitioned to a more gradual change *** contrast,the scour topography around the piles continuously *** suggests that sediment displacement and the associated sculpting of the seabed around pile foundations are sustained and progressive processes,altering the underwater landscape over *** results of this empirical investigation have significant implications for the design and constructio

关键词： local scour piles gap ratio attack angle

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

Global Dynamic Responses and Progressive Failure of Submerged Floating Tunnel Under Cable Breakage Conditions

引用

China Ocean Engineering 2024年第4期38卷 676-688页

作者： ZHOU Xiang-bo QIAO Dong-sheng WANG Ming tang guo-qiang LU Lin OU Jinping State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

The Submerged Floating Tunnel(SFT)relies on a tensioned mooring system for precise *** sudden breakage of a single cable can trigger an immediate alteration in the constraint conditions of the tube,inducing a transient heave response within the structure along with a transient increase in cable tension experienced by adjacent *** more severe cases,this may even lead to a progressive failure culminating in the global destruction of the *** study used ANSYS/AQWA to establish a numerical model of the entire length SFT for the hydrodynamic response analysis,and conducted a coupled calculation of the dynamic responses of the SFT-mooring line model based on Orca Flex to study the global dynamic responses of the SFT at the moment of cable breakage and the redistribution of cable internal *** most unfavorable position for SFT cable breakage was identified,the influence mechanism of cable breakage at different positions on the global dynamic response was revealed,and the progressive chain failure pattern caused by localized cable breakage are also clarified.

关键词： submerged floating tunnel cable breakage global dynamic responses progressive failure

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

苯磺酸瑞马唑仑对大鼠胃部手术后氧化应激、炎症因子及CD4^(+)/CD8^(+)水平的影响

引用

中国临床药理学杂志 2024年第1期40卷 62-66页

作者：何涛唐国强胡婧楠河北省中医院麻醉科河北石家庄050011 河北省中医院药学部河北石家庄050011 石家庄市第五医院麻醉科河北石家庄050024

目的观察苯磺酸瑞马唑仑对大鼠胃部手术后氧化应激、炎症因子及CD4^(+)/CD8^(+)水平的影响。方法用盲肠部分切除术构建胃部手术大鼠模型。将大鼠随机分为空白组(不做麻醉及手术处理)、对照组(尾静脉注射丙泊酚注射液9 mg·kg^(-1),手术... 详细信息

目的观察苯磺酸瑞马唑仑对大鼠胃部手术后氧化应激、炎症因子及CD4^(+)/CD8^(+)水平的影响。方法用盲肠部分切除术构建胃部手术大鼠模型。将大鼠随机分为空白组(不做麻醉及手术处理)、对照组(尾静脉注射丙泊酚注射液9 mg·kg^(-1),手术中视情况追加每次3 mg·kg^(-1))和低、中、高剂量实验组(尾静脉注射苯磺酸瑞马唑仑注射液22、44、88 mg·kg^(-1),手术中视情况追加每次15 mg)。用硫代巴比妥酸法检测血清丙二醛(MDA)水平;用流式细胞术检测外周血CD4^(+)、CD8^(+)T淋巴细胞构成比;用酶联免疫吸附法检测血清肿瘤坏死因子-α(TNF-α)水平;用蛋白质印迹法检测血清p50、核因子抑制蛋白(IκBα)表达水平。结果空白组、对照组及低、中、高剂量实验组MDA水平分别为(0.81±0.11)、(2.37±0.20)、(1.86±0.28)、(1.32±0.19)和(1.05±0.23)mmol·g^(-1);CD4^(+)T淋巴细胞构成比分别为(29.24±2.81)%、(17.98±2.14)%、(20.96±3.47)%、(23.84±2.01)%和(26.41±2.95)%;CD8^(+)T淋巴细胞构成比分别为(17.28±2.13)%、(26.13±2.45)%、(23.85±3.04)%、(21.26±2.10)%和(19.32±1.98)%;TNF-α水平分别为(62.54±7.47)、(189.14±21.61)、(127.42±14.52)、(103.35±16.47)和(82.21±10.62)pg·mL-1;外周血p50蛋白表达水平分别为0.25±0.04、0.86±0.04、0.69±0.07、0.52±0.06和0.39±0.05;IκBα蛋白表达水平分别为0.19±0.04、0.73±0.08、0.61±0.07、0.49±0.06和0.32±0.05。空白组上述指标与对照组比较,差异均有统计学意义(均P<0.05);低、中、高剂量实验组上述指标与对照组比较,差异均有统计学意义(均P<0.05)。结论苯磺酸瑞马唑仑可能通过降低核因子-κB(NF-κB)信号通路活性减轻大鼠胃部手术后氧化应激及炎症反应,提高免疫能力。

关键词：胃部手术苯磺酸瑞马唑仑氧化应激炎症因子 CD4+/CD8+水平

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

控制杆-强制旋转对圆柱涡激振动的抑制作用研究

引用

船舶力学 2024年第5期28卷 705-715页

作者：陈威刘炳文刘家睿王坤包燕旭唐国强李晓彬武汉理工大学船海与能源动力工程学院武汉430063 武汉理工大学理学院武汉430063 大连理工大学海岸和近海工程国家重点实验室辽宁大连116023

为实现圆柱涡激振动的高效抑制,本文基于控制杆-强制旋转组合结构讨论圆柱涡激振动的抑制问题。对低雷诺数下的圆柱涡激振动进行数值模拟研究,对比分析不同控制杆数量和圆柱转速比下的流场特性、振动响应和流体力响应等。结果表明:与裸... 详细信息

为实现圆柱涡激振动的高效抑制,本文基于控制杆-强制旋转组合结构讨论圆柱涡激振动的抑制问题。对低雷诺数下的圆柱涡激振动进行数值模拟研究,对比分析不同控制杆数量和圆柱转速比下的流场特性、振动响应和流体力响应等。结果表明:与裸圆柱相比,控制杆具有一定的涡激振动抑制效果;对于三、五控制杆,通过调节转速比,可以实现最高98%的圆柱振幅抑制(对三控制杆,转速比为0.4~0.6;对五控制杆,转速比为0~0.2);圆柱振幅抑制与圆柱减阻区间相同;对于四、六控制杆,旋转对振幅抑制的影响较小;主圆柱表面的漩涡脱落和漩涡的合并会引起流体力系数的高幅波动,导致圆柱高振幅响应;没有漩涡合并和圆柱表面脱涡不明显时,流体力系数则无明显波动,圆柱振幅也显著降低。

关键词：涡激振动圆柱控制杆流固耦合旋转

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

A Fully Nonlinear HOBEM with the Domain Decomposition Method for Simulation of Wave Propagation and Diffraction

引用

China Ocean Engineering 2018年第6期32卷 646-654页

作者： JIANG Sheng-chao SHI Ze-hang SONG Chao ZHANG Gui-yong tang guo-qiang School of Naval Architecture State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Department of Civil and Environmental Engineering National University of Singapore Network and Information Center Dalian University of Technology

A higher-order boundary element method(HOBEM) for simulating the fully nonlinear regular wave propagation and diffraction around a fixed vertical circular cylinder is investigated. The domain decomposition method with continuity conditions enforced on the interfaces between the adjacent sub-domains is implemented for reducing the computational cost. By adjusting the algorithm of iterative procedure on the interfaces, four types of coupling strategies are established, that is, Dirchlet/Dirchlet-Neumman/Neumman(D/D-N/N), Dirchlet-Neumman(D-N),Neumman-Dirchlet(N-D) and Mixed Dirchlet-Neumman/Neumman-Dirchlet(Mixed D-N/N-D). Numerical simulations indicate that the domain decomposition methods can provide accurate results compared with that of the single domain method. According to the comparisons of computational efficiency, the D/D-N/N coupling strategy is recommended for the wave propagation problem. As for the wave-body interaction problem, the Mixed D-N/N-D coupling strategy can obtain the highest computational efficiency.

关键词： fully nonlinear boundary element method domain decomposition method wave propagation wave diffraction

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CDIO理念的海洋工程专业研究生工程实践能力培养体系建设

引用

教育教学论坛 2024年第9期 172-176页

作者：唐国强乔东生吕林闫晓惠大连理工大学港航与海洋工程学院辽宁大连116024

随着新时期海洋工程产业的快速发展,对海洋工程领域的专业人才提出了日益严格的要求,多学科的知识储备和出色的工程实践能力已成为不可或缺的素养。针对目前海洋工程专业研究生工程实践能力培养体系建设方面存在的一些不足之处,在CDIO... 详细信息

随着新时期海洋工程产业的快速发展,对海洋工程领域的专业人才提出了日益严格的要求,多学科的知识储备和出色的工程实践能力已成为不可或缺的素养。针对目前海洋工程专业研究生工程实践能力培养体系建设方面存在的一些不足之处,在CDIO理念的导向下,围绕实验平台建设、校企实践合作及科技创新训练三个方面,提出了一套研究生工程实践能力培养体系的改进方案。这些改进方案对于国内众多高校海洋工程专业研究生培养体系的建立具有直接参考价值,并为其他专业领域教学改革提供了示范和辐射推广作用。

关键词：研究生培养海洋工程 CDIO教学理念创新能力工程实践能力

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

Quantitative estimation of hourly precipitation in the Tianshan Mountains based on area-to-point kriging downscaling and satellite-gauge data merging

引用

Journal of Mountain Science 2022年第1期19卷 58-72页

作者： LU Xin-yu CHEN Yuan-yuan tang guo-qiang WANG Xiu-qin LIU Yan WEI Ming Institute of Desert Meteorology China Meteorological Administration.Urumqi 830002China Central-Asia Research Center of Atmosphere Science Urumqi 830002China College of Environment Zhejiang University of TechnologyHangzhou 310014China University of Saskatchewan Coldwater Lab Canmore T1W 3G1Canada Center for Hydrology University of SaskatchewanSaskatchewan S7N 5A2Canada Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing 210044China

Precipitation, a basic component of the water cycle, is significantly important for meteorological, climatological and hydrological research. However, accurate estimation on the precipitation remains considerably challenging because of the sparsity of gauge networks and the large spatial variability of precipitation over mountainous regions. Moreover, meteorological stations in mountainous areas are often dispersed and have difficulty in accurately reflecting the intensity and evolution of precipitation events. In this study,we proposed a novel method to produce high-quality,high-resolution precipitation estimates in the Tianshan Mountains, China, based on area-to-point kriging(ATPK) downscaling and a two-step correction, i.e., probability density function matching-optimum interpolation(PDF-OI). We obtained 1-km hourly precipitation data in the Tianshan Mountains by merging estimates from the Integrated Multisatellite Measurement(IMERG) product with observations from 1065 meteorological stations in the warm season(May to September) during 2016–2018. The spatial resolution and accuracy of the merged precipitation data greatly increased compared to *** to a cross-validation with gauged observations, the correlation coefficient(CC),probability of detection(POD) and critical success index(CSI) increased from 0.30, 0.50 and 0.24 for IMERG to 0.63, 0.65 and 0.38, respectively, for the merged estimates, and the root mean squared error(RMSE), mean error(ME) and false alarm ratio(FAR)decreased from 0.46 to 0.38 mm/h, 0.06 to 0.05 mm/h and 0.69 to 0.52, respectively. The proposed method will be useful for developing high-resolution precipitation estimates in mountainous areas such as central Asia and the Belt and Road Initiative regions.

关键词： Hourly precipitation Downscaling merging Tianshan Mountains IMERG Area-to-point kriging(ATPK)

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

On the Intelligent Optimization of the Crevice Structure in a Rapid Compression Machine

引用

Journal of Thermal Science 2024年第3期33卷 1200-1215页

作者： guo qiang LIU Jie WU Yingtao WANG Hewu tang Chenglong YU Ruiguang Department of Power Mechanical Engineering Beijing Jiaotong UniversityBeijing100044China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing100084China Beijing Key Laboratory of New Energy Vehicle Powertrain Technology Beijing100044China National International Science and Technology Cooperation Base Beijing Jiaotong UniversityBeijing100044China

In this study,the multi-objective intelligent optimization of the crevice structure in a rapid compression machine(RCM)is carried out based on the RCM simulation model modified with the KIVA-3V program.A multi-objective optimization simulation model of the crevice structure based on the large eddy simulation model coupled with the genetic algorithm NSGA-Ⅲis *** optimization parameters and seven optimization objectives are selected in the optimization *** results show that the genetic algorithm can quickly find the values of the optimized *** crevice volume ratio shows a trade-off relationship with the dimensionless temperature ratio T_(max)/T_(aver)and the tumble ratio.A larger crevice volume can reduce the flow of boundary layer cryogenic gas into the combustion chamber,thus improving the temperature *** addition,the crevice entrance width and the connecting channel length should be smaller,while the volume of the crevice main chamber should be larger,so as to sufficiently introduce the low-temperature gas of the boundary layer into the crevice and reduce their influence on the temperature field of the combustion *** the crevice volume accounts for10%of the total volume,the temperature uniformity of the combustor is significantly enhanced,and when the crevice volume accounts for 30.4%,there is almost no low-temperature vortex in the combustion chamber.

关键词： rapid compression machine adiabatic core area ignition delay period crevice structure

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

A new 3D plastoelastohydrodynamic lubrication model for rough surfaces

引用

Friction 2024年第6期12卷 1176-1193页

作者： Shengyu YOU Jinyuan tang qiang WANG State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China

Plastoelastohydrodynamic lubrication of rough surfaces(R-PEHL)is a cutting-edge area of research in interface fluid-structure coupling *** existing R-PEHL model calculates the elastic-plastic deformation of rough surface by the Love equation in a semi-infinite space smooth surface,which deviates from the actual ***,it is an innovative work to study the exact solution of elastic-plastic deformation of rough surface and its influence on the solution results of R-PEHL *** this paper,a new contact calculation model of plastoelastohydrodynamic lubrication(PEHL)with three-dimensional(3D)rough surface is proposed by integrating numerical method of EHL and finite element *** new model eliminates an original error introduced by the assumption of semi-infinite space in contact calculation,providing wide applicability and high *** the given rough surfaces and working conditions,the study reveals that:(1)the oil film pressure calculated by the new model is lower than that of the smooth surface in semi-infinite space by 200–800 MPa;(2)the Mises stress of the new model is 2.5%–26.6%higher than that of the smooth surface in semi-infinite space;(3)compared with the semi-infinite space assumption,the rough surface plastic deformation of the new model is increased by 71%–173%,and the local plastic deformation singularity may appear under the semi-infinite space assumption;(4)the plastic deformation caused by the first contact cycle on the rough surface of the new model accounts for 66.7%–92.9%of the total plastic deformation,and the plastic deformation of the semi-infinite space accounts for 50%–83.3%.This study resolves the contradiction between the smooth surface assumption and the rough surface in the existing R-PEHL model,establishing a solid logic foundation for the accurate solution of R-PEHL model.

关键词： rough surface plastoelastohydrodynamic lubrication(PEHL) asperity plastic deformation semi-infinite space

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

Advances in ice avalanches on the Tibetan Plateau

引用

Journal of Mountain Science 2024年第6期21卷 1814-1829页

作者： tang Minggao LI Guang ZHAO Huanle XU qiang WU Guangjian YANG Wei guo Daojing State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China College of Environment and Civil Engineering Chengdu University of TechnologyChengdu 610059China Institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101China

As some of the greatest natural disasters in the cryosphere,ice avalanches(IAs)seriously threaten lives and cause catastrophic damage to the resource environment,but a comprehensive overview of the state of knowledge on IAs remains *** summarized 63 IAs on the Tibetan Plateau(TP)since the 20th century,of which,over 20 IAs occurred after the 21st *** distributions of IAs are mainly concentrated in the southeastern and northwestern TP,and the occurrence time of IAs is mostly concentrated from July to *** highlight recent advances in mechanical properties and genetic mechanisms of IAs and emphasize that temperature,rainfall,and seismicity are the inducing *** failure modes of IAs are summarized into 6 categories by examples:slip pulling type,slip toppling type,slip breaking type,water level collapse type,cave roof collapse type,and wedge failure ***,we deliver recommendations concerning the risk assessment and prediction of *** results provide important scientific value for addressing climate change and resisting glacier-related hazards.

关键词： Ice avalanche Global warming Genetic mechanism Risk assessment Tibetan Plateau

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：