Journal of Engineering and Sustainable Development最新文献_第4页

A COMBINED ULTRASONIC PROCEDURE TO EVALUATE DAMAGE IN CONCRETE BEAMS SUBJECTED TO STATIC LOAD 采用超声波组合程序评估承受静载荷的混凝土梁的损伤情况

Journal of Engineering and Sustainable Development Pub Date : 2024-03-01 DOI: 10.31272/jeasd.28.2.5

Sabah Fartosy, Narmeen Abdalwahhab Abdalqadir, Haider Ali Al-Mussawy, Nagham Qasim Jafar, Soumya Ghosh

引用次数: 0

PERFORMANCE OF SCREW HORIZONTAL AND BRIDGE LINKAGE PHOTOVOLTAIC ARRAY CONFIGURATIONS 螺旋水平和桥式联动光伏阵列配置的性能

Journal of Engineering and Sustainable Development Pub Date : 2024-03-01 DOI: 10.31272/jeasd.28.2.9

Mohammed Osamah Subhi, Wafaa Saeed Majeed

{"title":"PERFORMANCE OF SCREW HORIZONTAL AND BRIDGE LINKAGE PHOTOVOLTAIC ARRAY CONFIGURATIONS","authors":"Mohammed Osamah Subhi, Wafaa Saeed Majeed","doi":"10.31272/jeasd.28.2.9","DOIUrl":"https://doi.org/10.31272/jeasd.28.2.9","url":null,"abstract":"Due to partial shading effects on the productivity of solar panels which in turn negatively impacts the performance characteristics of photovoltaic systems, researchers work on different studies to overcome this phenomenon and improve solar system productivity. Therefore, this study aims to investigate different techniques to enhance the output power, fill factor, and efficiency of the PV system by reducing the number of local maximum power peaks, power losses, and mismatch losses. The configurations include a novel static reconfiguration technique, called a Screw Horizontal photovoltaic array, and a recently developed technique known as a Bridge Linkage array. Both of these are modeled using MATLAB/Simulink software and examined during six shading patterns. The novelty of this study is that we combined the above static reconfiguration technique with another modern technique called blocking and bypass diode technology to prevent the effect of reverse current and hotspot phenomena respectively. According to the results, the Bridge Linkage configuration performs the most efficiently under partial shading conditions compared to the Screw horizontal PV array configuration.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":" 941","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140092017","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

EFFECT OF ADDING RED AND YELLOW PIGMENTS TO GEOPOLYMER CONCRETE 在土工聚合物混凝土中添加红色和黄色颜料的效果

Journal of Engineering and Sustainable Development Pub Date : 2024-03-01 DOI: 10.31272/jeasd.28.2.6

Rusul Abdul Rahim Ghadban, Mohammed Ali Abdulrehman

{"title":"EFFECT OF ADDING RED AND YELLOW PIGMENTS TO GEOPOLYMER CONCRETE","authors":"Rusul Abdul Rahim Ghadban, Mohammed Ali Abdulrehman","doi":"10.31272/jeasd.28.2.6","DOIUrl":"https://doi.org/10.31272/jeasd.28.2.6","url":null,"abstract":"This study examined the feasibility of producing colored geopolymer concrete using slag as the binder and investigated the effects of pigment on various properties of geopolymer concrete. The geopolymer concrete was supplemented with two varieties of pigment, namely iron oxide hydroxide in the shades of \"red\" and \"yellow\", then the following tests of compressive strength, rebound number, density, and ultrasonic pulse velocity were carried out on it. The highest compressive strength value was achieved when adding 1% of pigments, which increased the red and yellow values from the reference value by 2.7 percent and 1.8 percent, respectively. The best rebound number values can be obtained by adding 1% yellow and 3% red, which increased the red and yellow values from the reference value by 8% and 15%, respectively. The density increases as the proportion of the additional pigment rises. The maximum density values were achieved by incorporating 1% of red and yellow pigment, with a respective increase of 1% and 3% for red and yellow. The highest values of ultrasonic pulse velocity when adding 1% of yellow and red color pigments increased by 1.7% for yellow and 2% for red. The optimal addition is 1.2% as it enhances properties and reduces expenses when utilizing smaller pigments.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":"106 49","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140088625","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

URBAN CONTEXT ANALYSIS ACCORDING TO THE CONCEPT OF SPENCER'S BIOLOGICAL THEORY USING GIS: BALAD CITY CASE STUDY 利用地理信息系统，根据斯宾塞的生物理论概念分析城市环境：巴拉德市案例研究

Journal of Engineering and Sustainable Development Pub Date : 2024-03-01 DOI: 10.31272/jeasd.28.2.4

Ali Dhafer Abed, Nuridah Binti Sabtu

{"title":"URBAN CONTEXT ANALYSIS ACCORDING TO THE CONCEPT OF SPENCER'S BIOLOGICAL THEORY USING GIS: BALAD CITY CASE STUDY","authors":"Ali Dhafer Abed, Nuridah Binti Sabtu","doi":"10.31272/jeasd.28.2.4","DOIUrl":"https://doi.org/10.31272/jeasd.28.2.4","url":null,"abstract":"Concepts of evolution theory (by Herbert Spencer) were analyzed using a Geographic Information System according to living notions in the context of an urban city. The idea of the theory was applied to the society within the context of Balad city to find out whether the concepts of contrast, integration, specialization, and exclusivity on which the theory is based have an impact on the services in the city and an effect on the structure of the social elements and the stages of its development. The research problem centered on the shortcomings of the theory in predicting and explaining the morphological and functional structure of the city, while the main objective is to analyze the concepts of biological theory according to the requirements of the context of the study area. The analysis results of the living context notions present in the city were compared with the urban housing standards using GIS to determine the extent to which the context conforms to the concept of Spencer's theory. The research found the inability of the biological side of the theory to explain the population concentration in residential neighborhoods, as well as the lack of reliance on the concepts of contrast and integration in predicting the reasons for the growth and expansion of the city, and that the city neighborhoods showed a variance in their services without showing integration and exclusivity in these services, that is, the lack of integration organic between the biological parts of the city.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":" 607","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140092509","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 OF EPOXY-NANOCOMPOSITE PROPERTIES 环氧纳米复合材料性能综述

Journal of Engineering and Sustainable Development Pub Date : 2024-01-01 DOI: 10.31272/jeasd.28.1.6

Samer Saad Abbas, R. M. Raouf, Harith H. Al-Moameri

{"title":"A REVIEW OF EPOXY-NANOCOMPOSITE PROPERTIES","authors":"Samer Saad Abbas, R. M. Raouf, Harith H. Al-Moameri","doi":"10.31272/jeasd.28.1.6","DOIUrl":"https://doi.org/10.31272/jeasd.28.1.6","url":null,"abstract":"Epoxy resins have been the subject of many studies as a consequence of their extensive usage in recent years. The brittleness and low resistance to propagation and crack initiation of epoxy resins are well-recognized characteristics. Therefore, in recent years, experts have concentrated on increasing epoxy resin's fracture resistance. Adding inorganic nanoparticles like titanium dioxide (TiO2) TiO2, silica (SiO2), carbon black, alumina (Al2O3), and others to the polymer matrix is one of the most investigated techniques in polymer science. Despite having a modest nanofiller content, the resulting nanocomposites may enhance their thermal, mechanical, rheological, electrical, and optical characteristics. These nanocomposites are an alternative to metal-based materials. They have great promise as multifunctional materials in a range of applications, including optoelectronic devices, semiconductor devices, civil engineering, automotive, and aerospace. To show potential future directions and market prospects for polymer nanocomposites reinforced with TiO2 nanoparticles, current results, and trends have been examined and highlighted. In addition, the current review surveys many studies that highlighted using nanoparticles as reinforcement, their different structure, the interface, and the geometry and structure of the resulting nano-materials reinforced resin.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":"47 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139126837","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

CALCULATING THE NATURAL FREQUENCY OF PRE-TWISTED BEAM 计算预扭梁的固有频率

Journal of Engineering and Sustainable Development Pub Date : 2024-01-01 DOI: 10.31272/jeasd.28.1.1

Zainab M. Shukur, R. Neamah, Husam Jawad Abdulsamad, L. S. Al-Ansari, Sutartip Wittayapiyanon

{"title":"CALCULATING THE NATURAL FREQUENCY OF PRE-TWISTED BEAM","authors":"Zainab M. Shukur, R. Neamah, Husam Jawad Abdulsamad, L. S. Al-Ansari, Sutartip Wittayapiyanon","doi":"10.31272/jeasd.28.1.1","DOIUrl":"https://doi.org/10.31272/jeasd.28.1.1","url":null,"abstract":"Beams in two configurations; uniform and non-uniform, are common structural components utilized for several engineering applications. Thus, the studies dealing with their behavior under dynamic and vibrations have been increased. In this research, the transverse vibration phenomena of pre-twisted beams were experimentally and theoretically studied by investigating the effect of twisting angles on the first three transverse natural frequencies. In the present experimental part, the pre-twisted beams are manufactured using a 3D printer, and the fundamental frequencies of manufactured pre-twisted beams are measured by a suitable rig. In the theoretical work, the finite element method is used to simulate the transverse vibration behavior of the pre-twisted beams. The accuracy of the simulation process is checked by comparison of the first natural frequencies calculated by the finite element method (using ANSYS Workbench Software) with those measured experimentally. The results show that there is an excellent agreement between the experimental results and finite element outputs. For the clamped-free pre-twisted beam, there is no critical twisting angle. The critical twisting angle is equal to the mode number for simply – simply and clamped simple pre-twisted beam. While there is more than one value of critical twisting angle for the clamped-clamped pre-twisted beam.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":"27 25","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139125790","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

TRIPLE-BAND CIRCULAR PATCH MICROSTRIP ANTENNA FOR WIRELESS COMMUNICATION 用于无线通信的三频圆形贴片微带天线

Journal of Engineering and Sustainable Development Pub Date : 2024-01-01 DOI: 10.31272/jeasd.28.1.5

Abeer Khalid Nghaimesh, Ali Khalid Jassim

{"title":"TRIPLE-BAND CIRCULAR PATCH MICROSTRIP ANTENNA FOR WIRELESS COMMUNICATION","authors":"Abeer Khalid Nghaimesh, Ali Khalid Jassim","doi":"10.31272/jeasd.28.1.5","DOIUrl":"https://doi.org/10.31272/jeasd.28.1.5","url":null,"abstract":"In this article, a triple-band patch antenna using a circular patch microstrip antenna is constructed with a low-profile patch antenna using a 1.5 mm thick FR4 substrate (εr= 4.3). As mobile devices like smartphones and laptops become more common, the usage of tiny, triple-band antennas has also become more common. The objective of this research is to design a circular patch antenna with a 3–11 GHz dipole-like radiation pattern, which may be used for industrial, scientific, and medical reasons. For the suggested triple-band antenna design, the slotted radiator with six arches and the reduction of the ground plane are among the components. In addition, the standard 50 Ω RF transmission line stimulates the patch antenna; this transmission line is attached to the microstrip line by an impedance-compliant SMA connection. Data from the experiments are obtained, evaluated, and compared; to the patch's surface current distributions, gain, and radiation patterns. According to the measurements, S11 has an impedance bandwidth in the 5.5 GHz band of less than -10 dB, 6.6 GHz band, and 10.4 GHz band at all frequencies. The superb radiation pattern performance, relatively consistent gain throughout the bands, and practical bandwidths of this antenna make it a good choice for C-band and dual X-band applications.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":"28 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139126286","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

CURING CONDITIONS IMPACT THE PROPERTIES OF A MODIFIED GEOPOLYMER MORTAR 固化条件对改性土工聚合物砂浆性能的影响

Journal of Engineering and Sustainable Development Pub Date : 2024-01-01 DOI: 10.31272/jeasd.28.1.10

Rusul Jabbar, H. Kamal

引用次数: 0

PERFORMANCE OF CONCRETE SLAB REINFORCED BY CFRP BARS AND STRENGTHENED BY DIFFERENT LAYOUT OF CFRP LAMINATES 用 CFRP 钢筋加固并用不同布局的 CFRP 层压板加固的混凝土板的性能

Journal of Engineering and Sustainable Development Pub Date : 2024-01-01 DOI: 10.31272/jeasd.28.1.9

Entidhar Najm Abed, M. Medhlom

{"title":"PERFORMANCE OF CONCRETE SLAB REINFORCED BY CFRP BARS AND STRENGTHENED BY DIFFERENT LAYOUT OF CFRP LAMINATES","authors":"Entidhar Najm Abed, M. Medhlom","doi":"10.31272/jeasd.28.1.9","DOIUrl":"https://doi.org/10.31272/jeasd.28.1.9","url":null,"abstract":"In recent years, Fiber Reinforced Polymer (FRP) rebar has been adopted to reinforce structural concrete elements such as slabs. FRP strips are also increasingly used to reinforce or strengthen concrete members that require higher carrying capacity or to restore damaged structural elements. Therefore, the reinforcement of concrete structures with this material is increasing but the effect of variables on CFRP-reinforced concrete slabs and externally bonded with CFRP laminates has not been evaluated in detail. This study presents a numerical analysis of the structural performance of concrete slabs reinforced by CFRP bars and strengthened by CFRP laminates using a finite element approach with ANSYS software. Six models with the same geometry (1550x1550x100 mm) were analyzed. Four models were reinforced with CFRP bars and externally strengthened with CFRP laminates, one model was reinforced with CFRP bars without external strength, and one reference model with traditional reinforcing bars (control specimen). Different parameters were adopted, such as amounts of FRP bars and CFRP laminates layout in which some models contained both CFRP bars and CFRP laminates. A uniformly distributed load that was calculated by plastic analysis was applied at the top surface area of each model. The plastic load considers the contribution of the laminated CFRP strips that increased the strength of the slab. Analysis results in the maximum strength carrying capacity in equivalent CFRP bars exhibit higher strength percentages of 5.07% of load capacity but differed in mode of failure than conventional reinforcements control slab.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":"116 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139126157","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

IMPACT OF MEASUREMENTS TECHNIQUES ON HEAT TRANSFER CHARACTERISTICS IN AIR JET ARRAYS 测量技术对空气喷射阵列传热特性的影响

Journal of Engineering and Sustainable Development Pub Date : 2024-01-01 DOI: 10.31272/jeasd.28.1.2

Assim Hameed Yousif Al Daraje, Afrah Awad, Mohamed Gogazeh, Hanan Afeef Mohammad Khamees

{"title":"IMPACT OF MEASUREMENTS TECHNIQUES ON HEAT TRANSFER CHARACTERISTICS IN AIR JET ARRAYS","authors":"Assim Hameed Yousif Al Daraje, Afrah Awad, Mohamed Gogazeh, Hanan Afeef Mohammad Khamees","doi":"10.31272/jeasd.28.1.2","DOIUrl":"https://doi.org/10.31272/jeasd.28.1.2","url":null,"abstract":"Air impact processes have diverse applications in engineering, including backflow welding, textile drying, and gas turbine blade and combustion liner cooling. This research examines the influence of experimental methodologies and measurement tools on convective heat transfer in adjustable air jet assemblies. The experiment involves the use of heated targets made of thin stainless steel foil with constant heat flux boundary conditions. Thermography measures target surface temperatures by analyzing how internal passage cross-flow affects convective heat transfer via outflow adjustments. The experiments involve two arrays of jet nozzles: inline and staggering, each comprising 44 impingement jet nozzles arranged in 4 rows with 11 jet holes in each row. The study presents unsteady time average local and spatial Nusselt numbers as functions of jet Reynolds number (4630-14000) and explores their dependence on the jet nozzle diameter. Cross-flow levels significantly affect spatial and local Nusselt numbers in both local and span-wise averaged values, regardless of the Reynolds number. Strong cross-flow (single configuration) distributes flow causing turbulence and uneven heat distribution, reducing Nusselt numbers. In contrast, moderate cross-flow (double configuration) improves heat transfer and increases Nusselt numbers. The study emphasizes the crucial role of experimental techniques in heat transfer evaluation and demonstrates agreement with prior studies within a standard error below 5%.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":"15 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139129243","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