BAU Journal - Science and Technology最新文献_第8页

FLEXURAL TESTING OF VARIOUS COMPOSITE-BEAMSUNDER QUASI-STATIC LOADS 准静态载荷下各种复合梁的弯曲试验

BAU Journal - Science and Technology Pub Date : 2020-03-04 DOI: 10.54729/2959-331x.1004

Wael Slika, A. Masri, O. Baalbaki

{"title":"FLEXURAL TESTING OF VARIOUS COMPOSITE-BEAMSUNDER QUASI-STATIC LOADS","authors":"Wael Slika, A. Masri, O. Baalbaki","doi":"10.54729/2959-331x.1004","DOIUrl":"https://doi.org/10.54729/2959-331x.1004","url":null,"abstract":"The successful interaction between concrete and steel has inspired researchers to develop composite structural systems. Steel and concrete are utilized in various configurations to reduce construction costs and assure optimal load-response behavior. Since the response spectrum of the composite system varies from one system to another, adequate understanding of the composite system behavior is essential to guarantee a desired response. Several parameters affect the flexural capacity and failure mode of a composite section, such as geometry, material properties and bond. In practice, advanced material mechanics and numerical modeling can be utilized for simulating section response, however, variability in the material response hinders accurate prediction. To serve as a benchmark and facilitate optimal composite section design, this paper presents a thorough experimental investigation of four types of composite beams under flexural loading. The first type represents reinforced concrete T-shaped beams confined by structural steel members. The second system comprises steel tubes filled with concrete. The third type consists of an open web steel joist encased in reinforced concrete. The fourth system represents rectangular shaped RC beams strengthened by steel plates. The results confirm the diversity of behavior of composite sections and reveal significant enhancement in the failure mode and flexural behavior as compared to control non-composite sections.","PeriodicalId":124185,"journal":{"name":"BAU Journal - Science and Technology","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124945710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A REVIEW ON THE USE OF VEGETABLE OIL AND ITS WASTE IN CONSTRUCTION APPLICATIONS 植物油及其废弃物在建筑中的应用综述

BAU Journal - Science and Technology Pub Date : 2020-03-04 DOI: 10.54729/2959-331x.1005

A. Chamaa, J. Khatib, A. Elkordi

引用次数: 4

MECHANICAL PROPERTIES OF TRANSITION METALS MN,FE AND ZN DOPED NIO NANOPARTICLES 过渡金属锰、铁、锌掺杂纳米镍的力学性能

BAU Journal - Science and Technology Pub Date : 2020-03-04 DOI: 10.54729/2959-331x.1011

A. Khalaf, J. A. Boukhari, Lidea Zeidan

引用次数: 0

THE IMPACT OF DESIGN CHANGES IN CONSTRUCTION PROJECTS ON THE COST CHARGED BY CONSULTANT OFFICES 建筑工程的设计变更对顾问办事处收费的影响

BAU Journal - Science and Technology Pub Date : 2020-03-04 DOI: 10.54729/2959-331x.1003

Hadi Abou Chakra

{"title":"THE IMPACT OF DESIGN CHANGES IN CONSTRUCTION PROJECTS ON THE COST CHARGED BY CONSULTANT OFFICES","authors":"Hadi Abou Chakra","doi":"10.54729/2959-331x.1003","DOIUrl":"https://doi.org/10.54729/2959-331x.1003","url":null,"abstract":"Abstract In any construction project, a large number of modifications occur. The consequences of those modifications may result in additional costs due to the re-design of the project on each member of the project’s stakeholders. The financial impact of modifications during the construction phase of a project on consultant offices will be explored in this study. The aim of this study is to investigate the cost of the modifications and to examine the type of relationship between the time spent on the design to accomplish the modifications and the amount of money earned in the return of the extra work done. As a wrong estimation of the additional cost may lead to an atrocious financial impact on the office and dramatic consequences. Professional interview method was used to collect data from four different Lebanese consultant offices. Eleven projects were selected in this study. These projects were categorized into three different groups based on the initial cost of the structural design. A regression model that can be used to forecast the cost of extra work for modifications based on the initial design cost was derived in this study. The outcome of this study will simplify the forecasting of cost of any modification in construction projects.","PeriodicalId":124185,"journal":{"name":"BAU Journal - Science and Technology","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129706545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

ROTARY OSCILLATION OF A RIGID SPHERE IN A COUPLE STRESS FLUID 一对应力流体中刚性球的旋转振荡

BAU Journal - Science and Technology Pub Date : 2020-03-04 DOI: 10.54729/2959-331x.1009

Tarek H. Shehadeh, E. Ashmawy

引用次数: 1

ON THE PRODUCT OF TWO HYPOEXPONENTIAL RANDOM VARIABLES 关于两个次指数随机变量的乘积

BAU Journal - Science and Technology Pub Date : 2020-03-04 DOI: 10.54729/2959-331x.1008

T. Kadri, K. Smaili, S. Kadry, Ali El-Joubbeh

引用次数: 0

SPEED BUMP DETECTION FOR AUTONOMOUS VEHICLES USING SIGNAL-PROCESSING TECHNIQUES 基于信号处理技术的自动驾驶车辆减速带检测

BAU Journal - Science and Technology Pub Date : 2020-03-04 DOI: 10.54729/2959-331x.1006

M. Darwiche, Wassim El-Hajj-Chehade

引用次数: 2

SIDERITE AS A WEIGHTING MATERIAL IN DRILLING MUD 作为钻井泥浆加重材料的菱铁矿

BAU Journal - Science and Technology Pub Date : 2020-03-04 DOI: 10.54729/2959-331x.1002

Khaled Abou Alfa, Rami Harkouss, J. Khatib

{"title":"SIDERITE AS A WEIGHTING MATERIAL IN DRILLING MUD","authors":"Khaled Abou Alfa, Rami Harkouss, J. Khatib","doi":"10.54729/2959-331x.1002","DOIUrl":"https://doi.org/10.54729/2959-331x.1002","url":null,"abstract":"Successful petroleum drilling largely depends on the type and quality of mud used in the process. There exist many types of muds, which differ in use and composition. Certain muds are composed of materials that can cause damage to the formation and the bottom-hole. This has resulted in the search for alternatives mud additives or addition of new materials to minimize the damage of the formation and enhance the stability of the wellbore. Several bodies of literature exist that research different sources of mud functions and additives, also their effect on the drilling process, the production zone and the environment. Density is one of the main properties of drilling mud because it is the responsible in controlling the formations pressure. So, many weighting agents exist to increase the density of drilling mud. Barite (BaSO4) has a specific gravity of 4.2–4.5 and hardness 2.5-3.5. It has been the most common weight material used in drilling fluids, it is preferred to other weighting materials because of its low cost and high purity but its main disadvantage that its composed of large amount of insoluble acid which damage the formation due to the invasion of the solids into the production zone. A new weighting agent that can be used instead of barite would be a new innovation in the oil field. Siderite (FeCO3) is a weighting material which has a specific gravity of 3.9 and a hardness of 3.5 and makes the mud weighted up to 20 lb/ gal. It is specified by a high acid solubility which didn’t cause damage to the formation compared to barite. So, it can be used as an alternative weighting material in both oil and water muds due to its high specific gravity and high acid solubility.","PeriodicalId":124185,"journal":{"name":"BAU Journal - Science and Technology","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128595474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

INFLUENCE OF NANO-AG ADDITION ON PHASE FORMATION AND EXCESS CONDUCTIVITY ANALYSIS OF (CU0.5TL0.5)-1223 SUPERCONDUCTING PHASE 纳米ag对(cu0.5tl0.5)-1223超导相形成及超电导率分析的影响

BAU Journal - Science and Technology Pub Date : 2020-03-04 DOI: 10.54729/2959-331x.1007

Nayera S. Mohammed, S. Mahmoud, Weleed Abdeen, M. Hasebbo

{"title":"INFLUENCE OF NANO-AG ADDITION ON PHASE FORMATION AND EXCESS CONDUCTIVITY ANALYSIS OF (CU0.5TL0.5)-1223 SUPERCONDUCTING PHASE","authors":"Nayera S. Mohammed, S. Mahmoud, Weleed Abdeen, M. Hasebbo","doi":"10.54729/2959-331x.1007","DOIUrl":"https://doi.org/10.54729/2959-331x.1007","url":null,"abstract":"Abstract Ceramic superconducting samples of type (nano-Ag)xCu0.5Tl0.5Ba2Ca2Cu3O10- δ , 0.0 ≤ x ≤ 3.0 wt.%, were successfully synthesized via single step solid-state reaction technique at 850 ºC and under ambient pressure. The samples were characterized by XRD and SEM. Obtained data revealed that the highest grains connectivity volume fraction was detected for the sample with x = 0.15 wt.%. The electrical properties of the prepared samples was examined using the electrical resistivity measurements, and the results proved that the highest superconducting transition temperature Tc was observed at x = 0.15 wt.%. Furthermore, the fluctuation conductivity Δσ (T), above Tc, was analyzed as a function of reduced temperature, t=(T-T_c^mf)/(T_c^mf ), using Aslamazov and Larkin (AL) theory and its modified form given by Lawrence-Doniach (LD) model. Excess conductivity analysis showed crossover between two dimensional (2D) to three-dimensional (3D) with decreasing temperature for all samples. The highest crossover temperature T2D-3D was observed for x = 1.5 wt.%, which showed the smallest coherence length along c-axis ξ (0), Fermi velocity vF, Fermi energy EF and interlayer coupling ν in these samples.","PeriodicalId":124185,"journal":{"name":"BAU Journal - Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133070968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0