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Design of Bridge Expansion Joints with Perforated Dowels Under Impact Loading 认领 引用 被引量：4
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作者 YODA Teruhiko AYASHI Mamiko 《Transactions of Tianjin University》 EI CAS 2008年第5期340-343,共4页
The expansion joints are expected to have movement capacity, bearing capacity for static and dynamic loading, water-tightness, low noise emission and traffic safety. In particular, the failure due to impact loading is... The expansion joints are expected to have movement capacity, bearing capacity for static and dynamic loading, water-tightness, low noise emission and traffic safety. In particular, the failure due to impact loading is the main reason for the observed damages. The problem of dynamic behavior of the expansion joints is so complex that we shall focus our attention on the impact factor for vehicle load that is governed by traffic impact. In order to overcome this difficulty, the cantilever-toothed aluminum joint (finger joint) is one of the promising joints under impact loading. In this study, from the viewpoint of design methodology, numerical studies for impact behavior were conducted for aluminum alloy expansion joints with perforated dowels. The design impact factor for the expansion joints with the perforated dowels against traffic impact loading was examined by using numerical simulations. 展开更多
关键词 bridge expansion joints traffic impact loading perforated dowel
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分布气隙变压器的利兹线绕组损耗计算方法研究 认领 引用
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作者 沈焜 李世茂 +2 位作者 黄晓生 孔毅鹏 陈为 《电源学报》 CSCD 北大核心 2026年第1期10-20,共11页
高频变压器绕组损耗的计算是CLLC变换器效率优化的关键,目前缺乏能准确、高效计算绕组损耗,尤其是利兹线绕组损耗的方法,因此针对利兹线高频变压器提出1种基于互阻抗等效电路的绕组损耗计算方法。首先,对比分析了基于一维Dowell模型及二... 高频变压器绕组损耗的计算是CLLC变换器效率优化的关键,目前缺乏能准确、高效计算绕组损耗,尤其是利兹线绕组损耗的方法,因此针对利兹线高频变压器提出1种基于互阻抗等效电路的绕组损耗计算方法。首先,对比分析了基于一维Dowell模型及二维Bessel函数法的利兹线绕组损耗解析计算方法。然后,建立了1种用于简化绕组损耗计算的互阻等效模型,给出具体算例,并与二维有限元仿真的阻抗矩阵进行对比,算例的等效串联电阻计算结果与有限元法的相对误差不高于6%,验证了所提方法的有效性和准确性。最后,搭建了用于CLLC变换器的高频变压器样机,通过实验测量验证了所提方法的可行性。 展开更多
关键词 CLLC谐振变换器 利兹线 绕组损耗 Dowell模型 有限元模型
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Knee salvage procedures: The indications, techniques and outcomes of large osteochondral allografts 认领 引用 被引量：6
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作者 Karen Chui Lee Jeys Martyn Snow 《World Journal of Orthopedics》 2015年第3期340-350,共11页
The overall incidence of osteochondral defect in the general population is estimated to be 15 to 30 per100000 people.These lesions can become symptomatic causing pain,swelling and decreased function of the knee,and ma... The overall incidence of osteochondral defect in the general population is estimated to be 15 to 30 per100000 people.These lesions can become symptomatic causing pain,swelling and decreased function of the knee,and may eventually progress to osteoarthritis.In the young and active population,partial or total knee arthroplasty(TKA)is rarely the treatment of choice due to risk of early failure.Osteochondral allograft transplantation has been demonstrated to be a safe and effective treatment of large osteochondral and chondral defects of the knee in appropriately selected patients.The treatment reduces pain,improves function and is a viable limb salvage procedure for patients,especially young and active patients for whom TKA is not recommended.Either large dowels generated with commercially available equipment or free hand shell allografts can be implanted in more posterior lesions.Current recommendations for fresh allografts stored at4C advise implantation within 21-28 d of procurement for optimum chondrocyte viability,following screening and testing protocols.Higher rates of successful allograft transplantation are observed in younger patients,unipolar lesions,normal or corrected malalignment,and defects that are treated within 12 mo of symptom onset.Patients with bipolar lesions,uncorrectable malalignment,advanced osteoarthritis,and those over40 tend to have less favourable outcomes. 展开更多
关键词 Osteochondral allograft Knee Salvage Shell Dowel
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中国—东盟农产品产业内贸易研究 认领 引用 被引量：11
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作者 杨丹萍 江奕 《农村经济》 CSSCI 北大核心 2014年第5期66-69,共4页
本文对中国与东盟在2003-2012年的农产品双边贸易数据进行了分析，通过一些产业内贸易指数工具的测算（如G-L指数、Brtilhart边际产业内贸易指数）以及Thom ＆ Mc Dowell垂直型和水平型边际产业内贸易指数，探讨了中国与东盟成员国之间... 本文对中国与东盟在2003-2012年的农产品双边贸易数据进行了分析，通过一些产业内贸易指数工具的测算（如G-L指数、Brtilhart边际产业内贸易指数）以及Thom ＆ Mc Dowell垂直型和水平型边际产业内贸易指数，探讨了中国与东盟成员国之间农产品产业内贸易水平及结构特征。结果表明，中国与东盟整体农产品产业内贸易水平不高，但总产业内贸易水平的增量主要是垂直型的产业内贸易拉动的。同时，从企业和政府两个角度对农产品贸易提出了取长补短、深化农产品加工、加强与外界交流合作等对策建议。 展开更多
关键词 产业内贸易 G-L指数 Brtilhart指数 Thom&Mc Dowell指数
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Numerical simulation of stress behavior of dowel–brick structures in TMSR 认领 引用 被引量：1
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作者 Hui-Qing Fan Chao-Chao Huang +4 位作者 Xiao Wang D.K.L.Tsang Xiao-Chun Zhang Xiao-Yan Wang Shi-Feng Zhu 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2020年第5期77-87,共11页
As essential elements of the graphite reflector in thorium-based molten salt reactor,dowel–brick structures are used to withstand complex working loads in the reactor core and their failure may lead to serious damage... As essential elements of the graphite reflector in thorium-based molten salt reactor,dowel–brick structures are used to withstand complex working loads in the reactor core and their failure may lead to serious damage of the graphite reactor core.It is crucial to investigate the stress behavior of dowel–brick structures for safe operation of the graphite reactor.In this study,three groups of finite element analyses and a strain test were carried out to investigate how the geometric parameters of the dowels affect the stress behavior of the dowel–brick structure.The numerical results indicate that the stress behavior of a dowel–brick structure is significantly affected by the diameter,length,and aspect ratio of the dowels.The maximum stress in the lower and upper bricks decreases with an increase in the dowel length.The location of maximum stress on both lower and upper bricks shifts from the root of the socket to the edge of that socket beside the contact region,as the length of the dowel increases.The shift of the maximum stress location occurs earlier for the upper bricks than for the lower bricks.The results of strain tests show good agreement with those of numerical analyses. 展开更多
关键词 Dowel–brick structure FEA Stress behavior Strain test
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Study of the Single Shear Performance of a Joint with a New Beech and Self-Tapping Screw Composite Dowel 认领 引用 被引量：1
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作者 Xudong Zhu Yingying Xue +3 位作者 Xuewen Zhang Pengfei Qi Jie Shen Changtong Mei 《Journal of Renewable Materials》 EI CAS 2022年第2期401-413,共13页
A new beech and self-tapping screw composite dowel is proposed and studied,its performance being compared with that of beech dowels and self-tapping screws alone.The single shear performance of components connected by... A new beech and self-tapping screw composite dowel is proposed and studied,its performance being compared with that of beech dowels and self-tapping screws alone.The single shear performance of components connected by composite dowels was tested.Results show that the dowels are a good choice for components requiring high stiffness.Screws remain a good choice for components requiring excellent seismic performance.Combination group presents similar maximum load stiffness to those of composite dowels,but other ductility parameters are superior for composite dowels.The best connection mode was provided by two composite dowels.Based on connecting two points,structural elements with two composite dowels showed much better load bearing ability than when joined by two beech dowels or by two self-tapping screws separately.The structural element with two composite dowels not only presented better initial stiffness,but also exhibited a better ductility coeffi-cient and less energy consumption.So,the composite dowels can be used for beam column connection,dowel laminated timber,and restoration or enhancement of ancient buildings. 展开更多
关键词 Composite dowel beech dowel self-tapping screw single shear performance
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New Unified Failure Model on Evenly Distributed Reinforced Concrete Members with Box Section 认领 引用 被引量：1
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作者 骆华勋 刘西拉 《Journal of Shanghai Jiaotong university(Science)》 EI 2013年第1期76-83,共8页
It is urgently needed to describe the structural collapse process under extreme conditions to survive people.For reinforced concrete structures it is still a difficulty to describe the failure of reinforced concrete m... It is urgently needed to describe the structural collapse process under extreme conditions to survive people.For reinforced concrete structures it is still a difficulty to describe the failure of reinforced concrete members under complex internal force combination,such as under axial forces,bending moment,shear forces, and torsion working together.In this paper,based on the traditional Nielsen model,a new unified failure model on reinforcement evenly distributed concrete members with box section under combined forces is introduced.The advantages of the proposed new model are to consider the dowel actions of reinforcements and reasonably to consider of the shear carrying capacity of concrete,especially when compression stress of concrete is in a high value.Finally,the theoretical results of the new model are compared with a series of experimental results of box section members.The comparison has verified that the new model is more accurate and feasible for the design and calculation of box section members. 展开更多
关键词 reinforced concrete dowel action concrete failure model box section
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Ion-Beam Surface Modification of Strut Dowel Used in ITER PF Support 认领 引用
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作者 罗蓉蓉 李鹏远 +4 位作者 韩石磊 孙振超 潘传杰 沈丽茹 金凡亚 《Plasma Science and Technology》 SCIE EI CAS CSCD 2013年第3期303-306,共4页
In this paper, surface modification of the strut dowel used in ITER PF support is reported. Different ions （nitrogenitanium） with different doses are implanted into the surface of strut dowel. The result of Auger El... In this paper, surface modification of the strut dowel used in ITER PF support is reported. Different ions （nitrogenitanium） with different doses are implanted into the surface of strut dowel. The result of Auger Electron Spectroscopy （AES） indicates that nitrogen can be implanted more deeply than titanium under the implantation condition of 60 kV accelerating voltage and a dose of 8×10^17/cm2 nitrogen. Surface Micro Hardness （SMH） and wear resistance are improved remarkably. Further SEM observation shows that there are no obvious scratches and damages after wear test. 展开更多
关键词 ITER PFCS dowel ion-beam implantation
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Experimental study on mechanical properties of dowel bar embedded in concrete under fatigue loads 认领 引用
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作者 李鹏飞 安雪晖 +1 位作者 何世钦 陈宸 《Journal of Southeast University(English Edition)》 EI CAS 2016年第4期445-450,共6页
To investigate the mechanical properties of a dowel action under fatigue loads, nine reinforced concrete specimens were fabricated, and the monotonic and fatigue loadings were performed on these specimens, respectivel... To investigate the mechanical properties of a dowel action under fatigue loads, nine reinforced concrete specimens were fabricated, and the monotonic and fatigue loadings were performed on these specimens, respectively. All of these specimens were divided into two series. Six specimens in SeriesⅠwith different bar diameters of 12, 20 and 25 mm were subjected to monotonic loads and were used to confirm the ultimate bearing capacity. The remaining three specimens in Series Ⅱ were subjected to fatigue loads and were designed to investigate the attenuation character of dowel action and the fatigue failure modes. The test results show that the accumulated fatigue damage due to fatigue loads can reduce the ultimate bearing capacity of specimens. With the increase in fatigue loads, the failure mode can transform to fatigue rupture of the dowel bar under the serviceability loading state,i. e. 55% of the monotonic capacity. The fatigue life is determined by the fatigue properties of steel and concrete.Based on the test data, the failure process of dowel action can be divided into two stages： the accumulation of fatigue damage and the fatigue rupture of dowel bar. 展开更多
关键词 dowel action fatigue loads fatigue failure mode fatigue life attenuation character
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Tree-Shaped Timber Structural System 认领 引用
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作者 Decio Gongalves Francisco Antonio Rocco Lahr +2 位作者 Carlito Calil Junior Mauro Augusto Demarzo Andre Luis Christoforo 《Journal of Civil Engineering and Architecture》 2013年第7期796-804,共9页
This paper lbcuses on the main characteristics of a tree-shaped timber structural system or simply tree-shaped. One of them is the complexity of its steel connections, responsible for the joint of bar elements, compou... This paper lbcuses on the main characteristics of a tree-shaped timber structural system or simply tree-shaped. One of them is the complexity of its steel connections, responsible for the joint of bar elements, compounding a complex structural system, which requires the application of the CYPECAD software version 2007 to solve the calculations problems. Its efficiency was confirmed by a variety of laboratory tests carried out with the whole structure. The tree-shaped is a timber structure that can be used in a large number of destinations, including residences, malls, sheds, hangars, etc.. Originally, it was conceived based on the well-known masterpiece ＂Sagrada Familia＂, whose author was Architect Antoni Gaudi I Cornet （1852-1926） in Barcelona/Spain. It was designed at the end of 19th century and its construction is still not finished. Gaudi inverted the logical order of the gothic concepts, i.e., light weights below and heavy weights above. Based on this concept, he always had in mind the figure of a tree in nature. The tree-shaped follows the same idea, using timber pieces connected by steel plates. Theoretical and numerical analyses have shown its efficiency and lightness for use in timber structures. 展开更多
关键词 Tree-shaped timber structure system constructive rationality modulated system timber dowels wood.
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Seismic performance of precast shear wall-slab connection under cyclic loading:experimental test vs.numerical analysis 认领 引用 被引量：5
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作者 Arthi S Jaya KP 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2020年第3期739-757,共19页
The structural behaviour of precast shear wall-diaphragm connection was compared with the monolithic connection under seismic loading.The monolithic connection was made by using U-bars connecting shear wall and slab,a... The structural behaviour of precast shear wall-diaphragm connection was compared with the monolithic connection under seismic loading.The monolithic connection was made by using U-bars connecting shear wall and slab,and the precast connection was made by using dowel bars in two steps.Firstly,U-shaped dowel bars from the precast shear wall lower panel and precast slab were connected by the longitudinal reinforcement,and screed concreting was done above the precast slab.Secondly,the shear wall upper panel was connected using the dowel bar protruding from the shear wall lower panel.The gap between the dowel bars and the duct was filled with non-shrink grout.The specimens were subjected to reverse cyclic loading at the ends of the slab.This study also aimed to develop a 3-D numerical model using ABAQUS software.The non-linear properties of concrete were defined by using the concrete damaged plasticity(CDP)model to analyse the response of the structure.The precast dowel connection between the shear wall and slab showed superior performance concerning ductility,strength,stiffness and energy dissipation.The developed finite element model exactly predicted the behaviour of connections as similar to that of experimental testing in the laboratory.The average difference between the results from finite element analysis and experimental testing was less than 20%.The results point to the conclusion that the shear resistance is provided by the dowel bars and the stiffness of the precast specimen is due to the diaphragm action of the precast slab.The damage parameter and the interaction between structural members play a crucial role in the modelling of precast connections. 展开更多
关键词 precast shear wall with the nib diaphragm dowel bars concrete damaged plasticity cohesive,reverse cyclic loading hysteresis behaviour
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Bending moment resistance of dowel corner joints in case-type furniture under diagonal compression load 认领 引用 被引量：1
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作者 Mosayeb Dalvand Ghanbar Ebrahimi +1 位作者 Mehdi Tajvidi Mohammad Layeghi 《Journal of Forestry Research》 SCIE CAS CSCD 2014年第4期981-984,共4页
We investigated bending moment resistance under diagonal compression load of comer doweled joints with plywood members. Joint members were made of ll-ply hardwood plywood of 19 mm thickness. Dowels were fabricated of ... We investigated bending moment resistance under diagonal compression load of comer doweled joints with plywood members. Joint members were made of ll-ply hardwood plywood of 19 mm thickness. Dowels were fabricated of Beech and Hornbeam species. Their diameters （6, 8 and 10 mm） and depths of penetration （9, 13 and 17 ram） in joint members were chosen variables in our experiment. By increasing the connector＇s diameter from 6 to 8 mm, the bending moment resistance under diagonal compressive load was increased, while it decreased when the diameter was increased from 8 to 10 mm. The bending moment re- sistance under diagonal compressive load was increased by increasing the dowel＇s depth of penetration. Joints made with dowels of Beech had higher resistance than dowels of Hornbeam. Highest resisting moment （45.18 N.m） was recorded for joints assembled with 8 mm Beech dowels penetrating 17 mm into joint members Lowest resisting moment （13.35 N.m） was recorded for joints assembled with 6 mm Hornbeam dowels and penetrating 9 mm into joint members. 展开更多
关键词 bending moment resistance plywood dowel diameter cor-ner joint, case-type furniture
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Influence of Dowel Center Spacing on Chamfered-Joint Components Made byCupressus funebris Wood 认领 引用
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作者 Jianhua Lyu Jialei Wang +1 位作者 Ziqiang Chen Ming Chen 《Journal of Renewable Materials》 SCIE EI CAS 2023年第1期309-319,共11页
The traditional tenon and mortise joint has low processing efficiency and a weak theoretical basis,making the structure easy to deform and damage,reducing the safety,and increasing waste of resources.This study aims t... The traditional tenon and mortise joint has low processing efficiency and a weak theoretical basis,making the structure easy to deform and damage,reducing the safety,and increasing waste of resources.This study aims to determine the optimum dowel center spacing parameter for chamfered-joint components and the maximum value of the strength of joints loaded into bending strength and tensile strength.In this study,an integrated opti-mization method combining the single-factor test and one-way ANOVA analysis was proposed to study the influ-ence of the dowel center spacing on the bending strength and the tensile strength of chamfered-joint components made by Cupressus funebris wood.The results revealed that the bending strength of chamfered-joint components decreases linearly with the increase of the dowel center spacing.In addition,the tensile strength of chamfered-joint components increases first and then decreases with the increase of the dowel center spacing,showing para-bola change.The relational expression between dowel center spacing,the bending strength,dowel center spacing and the tensile strength were obtained. 展开更多
关键词 Dowel center spacing chamfered-joint bending strength tensile strength Cupressus funebris wood
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Deviation Detection and Comparison Analysis of the Joints of Cement Pavements 认领 引用
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作者 CHEN Jian LI Xin-kai +1 位作者 PENG Peng FENG De-cheng 《Journal of Highway and Transportation Research and Development(English Edition)》 2018年第1期19-25,共7页
Joints are weak links in the structure of cement pavements,and heavy traffic sections must be set up to maintain the transmission capacity of the board and to ensure the long-term use of pavements.However,with the adv... Joints are weak links in the structure of cement pavements,and heavy traffic sections must be set up to maintain the transmission capacity of the board and to ensure the long-term use of pavements.However,with the advancement of force transferring rod construction technology,concrete with ratio and construction control of the influence of the force transmission rod actual spatial location and design of the location will inevitably produce some deviations.Given that such deviation will rapidly reduce the transfer capability of the board,the deviation of the transmission rod must be controlled in the construction process.However,basic data on the transmission rod are lacking.To this end,this paper conducts an experiment in the Beihei Expressway in Heilongjiang Province using MITSCAN2,and the test results are compared with the actual test data of two highways in the US and Canada.Some technical measures for improving the deviation of the transmission rod in the construction process are then proposed based on the detection and analysis results. 展开更多
关键词 road engineering cement pavement technical measures dowel bar deviation joint
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中日农产品产业内贸易实证研究 认领 引用 被引量：9
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作者 何立春 《黑龙江对外经贸》 2009年第6期10-12,共3页
近年来,中日农产品贸易发展较快,对带动两国双边贸易发展起到了积极作用。基于农产品产业内贸易理论,运用G-L指数、Br櫣lhart边际产业内贸易指数、Thom&McDowell垂直型和水平型边际产业内贸易指数,采用UN COMTRADE数据库中中日农产... 近年来,中日农产品贸易发展较快,对带动两国双边贸易发展起到了积极作用。基于农产品产业内贸易理论,运用G-L指数、Br櫣lhart边际产业内贸易指数、Thom&McDowell垂直型和水平型边际产业内贸易指数,采用UN COMTRADE数据库中中日农产品贸易数据进行实证研究。结果显示:中国和日本整体农产品产业内贸易水平较高,产业内贸易水平的增加量主要是水平型产业内贸易提供的,提出应加强农产品间、产业内贸易优势互补,深化农产品加工,提高农产品附加值等相关建议。 展开更多
关键词 农产品产业内贸易 G-L指数 Br櫣lhart指数 Thom Mc Dowell指数
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Dowell压裂防砂有新点子 认领 引用
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作者 张学鲁 《石油科技论坛》 2001年第3期40-40,共1页
Dowell公司是著名的斯伦贝谢公司设在美国洛杉矶市的一个专业服务性子公司,主要从事固井、酸化、压裂现场施工,同时也开展一些油藏监测、油层增产技术的研究工作,类似于我们国内油田企业的井下作业公司.2001年3月19-23日,我们一行7人访... Dowell公司是著名的斯伦贝谢公司设在美国洛杉矶市的一个专业服务性子公司,主要从事固井、酸化、压裂现场施工,同时也开展一些油藏监测、油层增产技术的研究工作,类似于我们国内油田企业的井下作业公司.2001年3月19-23日,我们一行7人访问了这家公司.Dowell公司有9个固井队、3个压裂队,3个酸化队,有员工150多人,象这样的专业服务公司据说斯伦贝谢有5个.它是其中之一. 展开更多
关键词 Dowell公司 压裂 防砂 石油开采
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邻近效应对无源电力滤波器中电抗器的影响 认领 引用
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作者 汤华龙 唐政 李建明 《上海电器技术》 2007年第2期18-23,共6页
在对工频电抗器绕组进行设计时，考虑到绕组的趋肤效应和邻近效应，根据Dowell方程对绕组的交流损耗进行了分析，找出影响绕组损耗的三个主要因素，即绕组层数，导体比厚度以及多孔因数，从而得出设计工频电抗器的指导原则。
关键词 邻近效应 电力溶波器 电抗器 绕组损耗 Dowell方程
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一种评估环形电感绕组损耗的方法 认领 引用
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作者 郑心城 陈为 《电气开关》 2017年第6期57-61,64,共5页
磁性元件的绕组损耗是影响电源效率的重要因素。由于绕组损耗机理复杂,更多时候采用有限元软件来分析,但是,这需要大量的计算机资源,也不适合线规优化。本文以环形电感为研究对象,通过Dowell模型分析电感的绕组损耗。采用柱坐标系下的Do... 磁性元件的绕组损耗是影响电源效率的重要因素。由于绕组损耗机理复杂,更多时候采用有限元软件来分析,但是,这需要大量的计算机资源,也不适合线规优化。本文以环形电感为研究对象,通过Dowell模型分析电感的绕组损耗。采用柱坐标系下的Dowell模型计算环形电感的内外层绕组损耗和两维Dowell模型计算上下层的绕组损耗。实验结果表明,计算精度较高,能够较好地用来评估环形电感的绕组损耗。 展开更多
关键词 绕组损耗 Dowell模型 环形电感
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Development of a Hybrid Pin Joint with a Compressed Wooden Dowel and Metal Pipe 认领 引用
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作者 Kiho Jung Shunpei Nakamine 《Open Journal of Civil Engineering》 2015年第1期84-96,共13页
A newly developed hybrid pin (HP), composed of a compressed wooden dowel inserted into a stainless steel pipe is suggested in this research. This configuration is expected to grant high stiffness by bending performanc... A newly developed hybrid pin (HP), composed of a compressed wooden dowel inserted into a stainless steel pipe is suggested in this research. This configuration is expected to grant high stiffness by bending performance of the metal pipe and rich ductility through shear deformation of compressed wooden dowel without brittle split of the joint member. Experimental tests were performed in order to verify your assumptions and pursue an optimum design. Double shear test perpendicular to the grain of HP was conducted with parameter of thickness and loading direction for base member for pin’s diameter. Rotational test for mortise and tenon joint inserted with HP was performed in order to evaluate the moment resisting performance. Consequently, the hybrid pin showed satisfactory performance as shear type fastener by virtues of not only relatively high stiffness but also rich ductility originated from the properties of each component, stain less steel pipe and compressed wood. 展开更多
关键词 Hybrid Pin Compressed Wooden Dowel Double Shear Moment Resisting Performance
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美国CDC Dowell博士访问中国CDC探讨SARS合作研究 认领 引用
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作者 王春晖 《生物制品快讯》 2003年第6期14-14,共1页
关键词 美国 CDC Dowell博士 中国 SARS 严重急性呼吸道综合征 流行病学
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