Diyala Journal of Engineering Sciences最新文献_第7页

Experimental Performance Evaluation of Absorption Refrigeration System Driven by Waste Heat of Engine Exhaust 发动机排气余热驱动吸收式制冷系统的实验性能评价

Diyala Journal of Engineering Sciences Pub Date : 2022-09-01 DOI: 10.24237/djes.2022.15308

Tabarek Daood Salman, Ahmed Al-Samari

引用次数: 1

Performance Enhancement of Shell and Tube Latent Thermal Storage System Using Copper Foam 利用泡沫铜增强壳管潜热储热系统的性能

Diyala Journal of Engineering Sciences Pub Date : 2022-09-01 DOI: 10.24237/djes.2022.15304

Luna Sabah, J. Abdulateef

{"title":"Performance Enhancement of Shell and Tube Latent Thermal Storage System Using Copper Foam","authors":"Luna Sabah, J. Abdulateef","doi":"10.24237/djes.2022.15304","DOIUrl":"https://doi.org/10.24237/djes.2022.15304","url":null,"abstract":"Latent Heat Thermal Storage (LHTS) based on Phase Change materials (PCMs) offers a promising solution for efficient utilization of intermittent energy from renewable sources. The primary limitation is the poor thermal conductivity of PCMs, which requires employing of thermal performance enhancement techniques. To enhance the thermal performance of PCM thermal energy storage, a copper foam with a high porosity is embedded with the PCM. A numerical simulation model has been developed to investigate the thermal behavior of two LHTS shell and tube configurations: pure PCM-LHTS (conventional LHTS) and PCM - copper-foam composite (foamed LHTS). The effect of the heat transfer fluid (HTF) temperature on the thermal response of LHTS during the charging process was considered. The results showed that the length of melting time for foamed LHTS was shorten about 82% as compared to conventional LHTS under the conditions of HTF temperature of 70°C and flow rate of 0.083 kg/sec. The results show that when the initial temperature of HTF for LHTS with foam was changed from 70°C to 75°C and then from 75°C to 80°C, the total charging time was enhanced by about 33 % and 29%, respectively. Based on results of temperature variation and liquid fraction of PCM, employing copper foam improved the charged thermal load during the charging process compared to LHTS without foam.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133833322","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

Vertical Displacement of Pile Under Dynamic Machine Loading 动力机械荷载作用下桩的竖向位移

Diyala Journal of Engineering Sciences Pub Date : 2022-09-01 DOI: 10.24237/djes.2022.15302

Noor Alkassim, Mohammed N. Jaro, Bayar J. AL-Sulayvani

引用次数: 0

Assessing the Quality Control Implementation in Iraqi Construction Projects and the Use of BIM to Control the Quality of Construction 伊拉克建设项目质量控制实施评估及BIM在施工质量控制中的应用

Diyala Journal of Engineering Sciences Pub Date : 2022-09-01 DOI: 10.24237/djes.2022.15306

Jinan A. Aboab, W. A. Hatem

{"title":"Assessing the Quality Control Implementation in Iraqi Construction Projects and the Use of BIM to Control the Quality of Construction","authors":"Jinan A. Aboab, W. A. Hatem","doi":"10.24237/djes.2022.15306","DOIUrl":"https://doi.org/10.24237/djes.2022.15306","url":null,"abstract":"The construction business regards as one of the most important industries in Iraq, contributing significantly to the Iraqi economy. The purpose of this research to assessing the quality of execution in engineering projects (in the public and private sectors) that based on the level of quality of execution control assessment. Construction project management is responsible for quality control in Iraqi construction projects, as well as how far the use of modern Technologies such as building information modeling (BIM) to regulate the quality of implementation. This study was carried out accreditation, and the descriptive-analytical technique was applied by distributing questionnaires via a field survey. In addition, the SPSS program was used in order to process the collected data 60 questionnaires were distributed to contractors and engineering offices. 50 useful questionnaires were received from respondents with an 83% response rate. The study found that the construction projects in Iraq still suffer from weaknesses in the quality control of construction projects as well as poor Construction Project Management Responsibilities of quality control and that BIM is still not utilized to implement quality in Iraqi construction projects.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134093000","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

Analytical Approximate Solutions of Nonlinear Fractional-Order Nonhomogeneous Differential Equations 非线性分数阶非齐次微分方程的解析近似解

Diyala Journal of Engineering Sciences Pub Date : 2022-09-01 DOI: 10.24237/djes.2022.15310

Falade K. Iyanda, Adesina K. Adio, Nuru Muazu, A. Muhammad

{"title":"Analytical Approximate Solutions of Nonlinear Fractional-Order Nonhomogeneous Differential Equations","authors":"Falade K. Iyanda, Adesina K. Adio, Nuru Muazu, A. Muhammad","doi":"10.24237/djes.2022.15310","DOIUrl":"https://doi.org/10.24237/djes.2022.15310","url":null,"abstract":"Computational simulation of natural phenomenon is currently attracting increasing interest in applied mathematics and computational physics. Mathematical software for simulation is limited by the availability, speed, and parallelism of high-performance computing. To improve the performance and efficiency of some numerical techniques, a step-by-step approach to mathematical software coding is needed to build robust parameter-oriented problems. Therefore, this article aims to present and apply the Adomian decomposition algorithm coded by the MAPLE 18 software package for the solutions of nonlinear fractional-order differential equations in applied physics and engineering sciences. The present technique is used without linearization or slight disturbance of nonlinear terms, which confirms the strength, accuracy, and simplicity of the algorithm. The two test problems are considered for different initial conditions and the solutions obtained show that the Adomian decomposition algorithm is fast, easy, stable in good agreement with analytical techniques and that a good computational approach to fractional-order value problems arising in applied mathematics and engineering sciences.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115354109","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

Characteristics and Morphological Studies of Nd Doped Titanium Thin Film Coating on SS 316L by DC Sputtering SS 316L表面溅射Nd掺杂钛薄膜涂层的特性及形貌研究

Diyala Journal of Engineering Sciences Pub Date : 2022-09-01 DOI: 10.24237/djes.2022.15303

R. A. Anaee, H. A. Abdullah

引用次数: 0

Characterization of Mechanical and Electrical Properties of Polystyrene Composite Reinforced by Hybrid Reinforcement Filler 混杂补强填料增强聚苯乙烯复合材料的力学和电学性能表征

Diyala Journal of Engineering Sciences Pub Date : 2022-09-01 DOI: 10.24237/djes.2022.15305

Tamer N. Abdalla, Ahmed F. Hasan, Ansam A. Hashim

{"title":"Characterization of Mechanical and Electrical Properties of Polystyrene Composite Reinforced by Hybrid Reinforcement Filler","authors":"Tamer N. Abdalla, Ahmed F. Hasan, Ansam A. Hashim","doi":"10.24237/djes.2022.15305","DOIUrl":"https://doi.org/10.24237/djes.2022.15305","url":null,"abstract":"Nowadays, electrically conductive polymer plays some important roles in the modern electronic devices because the crucial importance in telecommunication and biosensors. This type of materials offers an obvious decrease in the weight of the devices and it also has an environmental compatibility. A conductive polymer composite is promising alternative materials that has several advantages in the electronic applications currently. Polyester was used as a matrix, and copper –Tin /Zink inform of particulates with Copper short wires were considered electrically conductive fillers. The study prepared two groups (A and B) using different filler materials (Cu- Tin /Zink - Polyester and Cu- Tin /Zink –Cu- short wires / Polyester) with a weight fraction percentage of up to 50%. A composite processing method was slip casting to produce rectangular and cylindrical samples; after that samples were cured at room temperature for 48 hrs. Produced samples from both mixed were tested for density, ultimate tensile strength and scan electron microscope. AC conductivity test were performed for all samples using a frequency range from 50 Hz to 50 MHz to measure the dielectrically loss factor and electrical conductivity. From the study, it has been found that filler powder almost proved better ultimate strength behavior, and the peak value was determined at 30% wt., while short wires above 40 % wt. can cause a dramatic reduction in tensile strength. The results revealed that short wires filler van improves the electrical conductivity by approximately 50%; when compared with using particulate filler only. The result from the microstructure showed that short wires with metals powder could provide a connected network for improving the conductivity in the polymer matrix.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121566358","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: 1

Structural Behavior of Reinforced Concrete Deep Beams with Inclined Circular Holes 斜圆孔钢筋混凝土深梁的结构性能

Diyala Journal of Engineering Sciences Pub Date : 2022-09-01 DOI: 10.24237/djes.2022.15307

Abbas H. Abdulabbas, Murtada A. Ismael

{"title":"Structural Behavior of Reinforced Concrete Deep Beams with Inclined Circular Holes","authors":"Abbas H. Abdulabbas, Murtada A. Ismael","doi":"10.24237/djes.2022.15307","DOIUrl":"https://doi.org/10.24237/djes.2022.15307","url":null,"abstract":"The loads in the deep beams are transmitted diagonally from the load area to the support area by means of the strut and the tie. It is characterized by having a small span to depth ratio. which causes the distribution of stresses to be non-linear within the beam, which motivates researchers to study the effect of the placing of longitudinal hollows and the extent to which these holes affect the behavior and distribution of stresses for these types of beams. In addition to the advantages added by longitudinal hollow to the beam such as reducing weight and passing various electrical and mechanical services...etc. This study investigated the effect of making longitudinal circular holes (with a diameter of 50mm) with a slope on the structural behavior of three deep beams with a solid sample as a reference where the slope used was 0%, 4.3%, and 7.8%. The results showed that making holes reduces the load capacity of the deep beam, a decrease in the failure load was observed by 7.56%, 8.96%, and 11.2% for hollow beams with a slope of 0%, 4.3%, and 7.8%, respectively. Also, the appearance of flexural cracking increased by 2.66%, 2.66%, and 6.66%.and 2.14%, 3.52%, and 7.14%, respectively, for shear cracks. While the effect was small for the neutral axis location as well as for the vertical deflection.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134354608","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

Numerical Analysis of Natural Frequency for U-Shaped Expansion Bellows in Fixed-Fixed and Fixed-Free Conditions 固定-固定和自由-固定条件下u形膨胀波纹管固有频率的数值分析

Diyala Journal of Engineering Sciences Pub Date : 2022-09-01 DOI: 10.24237/djes.2022.15311

Mustafa Sabri Mohammed, Dhia A. Salal

引用次数: 0

Physical Properties of Hybrid Epoxy Composites Reinforced with Carbon Fiber and Ceramic Particles 碳纤维与陶瓷颗粒增强环氧复合材料的物理性能

Diyala Journal of Engineering Sciences Pub Date : 2022-09-01 DOI: 10.24237/djes.2022.15301

Noor Hassan Ali, Suha K. Shihab, Muzher Taha Mohamed

{"title":"Physical Properties of Hybrid Epoxy Composites Reinforced with Carbon Fiber and Ceramic Particles","authors":"Noor Hassan Ali, Suha K. Shihab, Muzher Taha Mohamed","doi":"10.24237/djes.2022.15301","DOIUrl":"https://doi.org/10.24237/djes.2022.15301","url":null,"abstract":"Hybrid polymer compounds have become modern times, as their applications have increased, especially those reinforced with fibers and molecules due to their high performance, which allows them to be used in different applications. In this research, the dependence of the thermal conductivity and density of epoxy compounds on the volume fraction ratio of the reinforcements including carbon fibers, silicon carbide and alumina will be discussed. new hybrid epoxy compounds have been developed. The epoxy compounds reinforced with plain weave carbon fibers with different volume fractions of micro-particles of silicon carbide and alumina were prepared by hand lay-up. The physical properties including thermal conductivity and density of hybrid epoxy compounds were determined experimentally. The results showed an increase in the thermal conductivity by increasing the proportion of silicon carbide and alumina without affecting the density of the epoxy compound. This high improvement in thermal conductivity with low density in these hybrid epoxy composites have been driven them as possible nominations for electronic devices. The optimum content of hybrid epoxy composite for electronic applications is at SiC 10% and Al2O3 5% with 15 carbon fiber and 70 epoxy. Thus, a new polymer-based compound with improved thermal conductivity for electronic applications was produced.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134521632","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: 1