Kufa Journal of Engineering最新文献_第9页

CHARACTERISTICS OF QUARTZ STONE POWDER BASED GEOPOLYMER MORTAR CURED AT AMBIENT CONDITION 石英石粉基地聚合物砂浆常温固化特性研究

Kufa Journal of Engineering Pub Date : 2021-08-09 DOI: 10.30572/2018/kje/120303

A. O. Mawlod, R. K. Ibrahim

引用次数: 0

DESIGN AND EVALUATION OF SOLAR ENERGYPOWERD GROUNDWATER PUMPING SYSTEM FOR IRRIGATION FARM IN DESERT 沙漠灌溉农田太阳能抽水系统设计与评价

Kufa Journal of Engineering Pub Date : 2021-07-31 DOI: 10.30572/2018/kje/120306

Ahmed J. Ghazi, Fatih Korkmaz, A. Ahmed

引用次数: 0

EFFECT OF NEAR-SURFACE MOUNTED BARS ON THE STRUCTURAL BEHAVIOR OF ONE-WAY RC SLAB 近表面安装钢筋对单向钢筋混凝土板结构性能的影响

Kufa Journal of Engineering Pub Date : 2021-07-31 DOI: 10.30572/2018/kje/120302

H. H. Kamonna, Douaa Jacoub Abd Al-Sada

引用次数: 0

COMPOSITIONS AND THERMO-CHEMICAL ANALYSIS OF BOVINE AND CAPRINE BONES 牛和羊骨的成分和热化学分析

Kufa Journal of Engineering Pub Date : 2021-07-31 DOI: 10.30572/2018/kje/120305

O. Ojo, I. Sekunowo, M. Ilomuanya, Philip O. Gbenebor, S. Adeosun

{"title":"COMPOSITIONS AND THERMO-CHEMICAL ANALYSIS OF BOVINE AND CAPRINE BONES","authors":"O. Ojo, I. Sekunowo, M. Ilomuanya, Philip O. Gbenebor, S. Adeosun","doi":"10.30572/2018/kje/120305","DOIUrl":"https://doi.org/10.30572/2018/kje/120305","url":null,"abstract":"Studies have been carried out on bovine bone due to its abundance and large quantity of hydroxyapatite (HAP) in it while caprine bone has been understudied. In this study, locally sourced bovine and caprine bones were washed in distilled water, defatted at 120°C for 1.5 hr in a pressure pot, ball-milled, sieved to 150 µm particle size and characterised. The X-ray fluorescence (XRF) and Energy dispersive X-Ray Spectroscopy (EDS) analysis revealed calcium, phosphorus and carbon as the main components. Both bones contained carbon and oxygen due to the presence of organic collagen but the quantity in caprine bone was a bit higher as revealed by the Fourier Transform Infrared Spectroscopy (FTIR) and EDS spectra. A slight difference in thermal decomposition patterns was recorded while X-Ray diffraction analysis (XRD) revealed the presence of identical functional phases. The microstructures showed needle-like and pebble-like shapes for bovine and caprine respectively, also on visual examination of the Scanning Electron Micrograph (SEM), the bovine samples tended to have particle surface roughness more than caprine. Consequently, the chemical properties of both bone raw samples were insignificantly different from each other except for collagen composition and morphology.","PeriodicalId":123515,"journal":{"name":"Kufa Journal of Engineering","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123432750","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

EXPERIMENTAL STUDY OF RELATIVE DENSITY EFFECT ON BEARING CAPACITY OF SAND REINFORCED WITH GEOGRID 相对密度对土工格栅加筋砂承载力影响的试验研究

Kufa Journal of Engineering Pub Date : 2021-07-02 DOI: 10.30572/2018/kje/120304

N. Fakher, M. Fakhruldin

{"title":"EXPERIMENTAL STUDY OF RELATIVE DENSITY EFFECT ON BEARING CAPACITY OF SAND REINFORCED WITH GEOGRID","authors":"N. Fakher, M. Fakhruldin","doi":"10.30572/2018/kje/120304","DOIUrl":"https://doi.org/10.30572/2018/kje/120304","url":null,"abstract":"Reinforced soil technology is considered one of the most important methods of soil improvement due to its simplicity and speed in implementation and saving cost. In this research a strip footing and geogrid (Tensar SS2) were used to reinforced sandy soil and investigated the effect of relative density on bearing pressure and compressibility. The soil was strengthen with four layers of (geogrid Tensar SS2) and used a five relative densities were (30.7%, 49.7%, 56.5%, 64%, and 75.9%) to include cases of loose, medium and dense sand. The results also showed the effect of relative density on the bearing capacity and the settlement as experimental tests indicated that increasing the relative density from 30.9% to 64% gave an improvement in soil bearing capacity, as well as an effective improvement in carrying capacity when increasing the relative density from 64%. The results showed that the bearing capacity when using relative densities of 49.7%, 56.5%, 64%, 75.9% increased by 1.218, 1.287, 1.512, and 2.1799, respectively, of the bearing capacity of reinforced soils with relative density of 30.7%. As for the effect of relative density on the settlement, it was found that the settlement is generally less in the case of soil with higher relative density.","PeriodicalId":123515,"journal":{"name":"Kufa Journal of Engineering","volume":"2673 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126288573","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

Improvement Of Sandy Soil Properties By Using Bentonite 膨润土改良砂土性质的研究

Kufa Journal of Engineering Pub Date : 2021-06-02 DOI: 10.30572/2018/kje/11289

Tawfiq Aamir Jawad

{"title":"Improvement Of Sandy Soil Properties By Using Bentonite","authors":"Tawfiq Aamir Jawad","doi":"10.30572/2018/kje/11289","DOIUrl":"https://doi.org/10.30572/2018/kje/11289","url":null,"abstract":"\u0000\u0000\u0000\u0000\u0000\u0000The main goal of this study is studying the improvement the engineering properties of soil mass. These properties are shear strength and maximum dry density which are effect on the foundations of the structures and their stability. The cohesionless soil can be given some cohesion by rearrangement of soil particles and decrease the voids between the particles by adding fine particles between them and decrease voids and increase the density, then the required properties can be improved. the chemical combinations due to the additives can also generate new bonded materials give the soil mass a good properties. In this study, the effect of different percentages of Bentonite which were added to the soil on the engineering properties of soil. The grain size distribution of soil sample and the classification of soil was (sandy poorly graded) according to the Unified Soil Classification. The compaction test was made for (2.5, 5, 7.5, 10)% of Bentonite. The direct shear test was made on the soil sample also for the same percentages and the shear strength parameters (C & Ø) were changed. Adding 7.5% of Bentonite to the poorly graded sandy soil gives better results than other percentages used in the present study.\u0000\u0000\u0000\u0000\u0000\u0000","PeriodicalId":123515,"journal":{"name":"Kufa Journal of Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125503760","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: 5

Mathematical Modeling of water surface at Unsteady Flow in Al-Msharah River Al-Msharah河非定常流水面数学模型

Kufa Journal of Engineering Pub Date : 2021-06-02 DOI: 10.30572/2018/kje/11295

S. Khassaf, Jaffar S. Maatooq, S. Nasrallah

{"title":"Mathematical Modeling of water surface at Unsteady Flow in Al-Msharah River","authors":"S. Khassaf, Jaffar S. Maatooq, S. Nasrallah","doi":"10.30572/2018/kje/11295","DOIUrl":"https://doi.org/10.30572/2018/kje/11295","url":null,"abstract":"\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000This study is concerned with unsteady flow in open channels in boundary conditions that may exist in river or channel system. A software Hydrologic Engineering Center-River Analysis System (HEC-RAS) was used for a case study. The software contains a hydrodynamic model for simulating the unsteady flow in open channels based on a one-dimensional form of the Saint-Venant equations, by formulating a discrete form using the implicit finite difference scheme, then solving using the Newton-Raphson iteration procedure and the modified Gaussian elimination technique. The case study adopted with the help of HEC-RAS application was applied to a reach of Al Msharah River (channel) between AL Msharah Barrage (upstream)and Al Malah Bridge (Downstream), for a length of (49 Km) divided to (52) cross sections. Model runs and the comparison of results with actual field data indicate that the accuracy of the results obtained for(θ=1 and ∆t=5 minute) is quite acceptable, where θ is a weighting parameter and ∆t is the time interval. The paper covers the case of normal depth of flow and observed water stage data within the period ( from January 2006 to July 2006) . The results demonstrate that the area at Al Am'arah city at distance 17.5 Km from upstream(cross section 30)could be subjected to flooding at High Flow, therefore, it is recommended to adjust cross sections to prevent the flooding in this area. At last , Calibration of the hydrodynamic model is achieved in a study reach using the observed data (water stage) along AL Msharah River and show that a good agreement.\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000","PeriodicalId":123515,"journal":{"name":"Kufa Journal of Engineering","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127924066","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

Numerical Study of MHD Free Convection in a Packed Bed Square Enclosure Using Local Thermal Non-Equilibrium (LTNE) Model 用局部热不平衡(LTNE)模型对填充床方罩内MHD自由对流的数值研究

Kufa Journal of Engineering Pub Date : 2021-06-02 DOI: 10.30572/2018/kje/11294

A. N. Mehdy, Qahtan AbdulZahra, Nora M. Sahib

引用次数: 1

Finite Volume Simulation of Steady Laminer Natural Convection Heat Transfer Through a Mercury –filled Triangular Enclosure with an Isothemal Cold Side Walls and an Isothemal Hot Bottom Wall. 具有等温冷壁和等温热壁的填充汞三角形外壳稳定层压机自然对流换热的有限体积模拟。

Kufa Journal of Engineering Pub Date : 2021-06-02 DOI: 10.30572/2018/kje/11292

A. Hussein

{"title":"Finite Volume Simulation of Steady Laminer Natural Convection Heat Transfer Through a Mercury –filled Triangular Enclosure with an Isothemal Cold Side Walls and an Isothemal Hot Bottom Wall.","authors":"A. Hussein","doi":"10.30572/2018/kje/11292","DOIUrl":"https://doi.org/10.30572/2018/kje/11292","url":null,"abstract":"\u0000\u0000\u0000\u0000\u0000\u0000Thermal and flow fields due to laminar steady natural convection in a triangular enclosure having thick conducting sidewalls have been investigated numerically. Inclined left and right side walls are maintained at isothermal cold temperatures while the bottom wall is maintained at isothermal hot temperature. Problem has been analyzed and the non-dimensional governing equations are solved using finite volume approach and employing more nodes at the fluid – solid interface. Triangular enclosure is assumed to be filled with mercury as a liquid metal with a Prandtl number of 0.026. Rayleigh number varies from 104 to 106 where the flow and thermal fields are computed for various Rayleigh numbers. Consequently, it was observed that the stream function and temperature contours strongly change with high Rayleigh number.The streamline and isotherm plots and the variations of the average Nusselt number at the hot bottom wall and the cold inclined side walls are also presented. The results explained a good agreement with another published results.\u0000\u0000\u0000\u0000\u0000\u0000","PeriodicalId":123515,"journal":{"name":"Kufa Journal of Engineering","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126431868","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

Studying the Internal Heat Transfer By Natural Convection Through an Inclined and a Modified Square Enclosure with a Triangular Top Wall. 倾斜和改进的三角形顶壁方形围护结构内部自然对流换热研究。

Kufa Journal of Engineering Pub Date : 2021-06-02 DOI: 10.30572/2018/kje/11293

S. Hussain

{"title":"Studying the Internal Heat Transfer By Natural Convection Through an Inclined and a Modified Square Enclosure with a Triangular Top Wall.","authors":"S. Hussain","doi":"10.30572/2018/kje/11293","DOIUrl":"https://doi.org/10.30572/2018/kje/11293","url":null,"abstract":"\u0000\u0000\u0000\u0000\u0000\u0000A numerical analysis used to simulate laminar natural convective heat transfer in a two-dimensional inclined and a modified square enclosure having a triangular top wall has been performed. The model is applied to analyze natural convection in this enclosure where the left side wall is subjected to a constant heat flux while the other opposite wall is kept at isothermal cold temperature. The other enclosure walls are considered adiabatic. The enclosure under study is filled with air with Prandtl number is taken as 0.71. The two-dimensional flow is solved numerically by using the Finite Volume Method (FVM).The computations are carried out at different heights of triangular top wall. The Rayleigh numbers considered ranging from 103 to 106. The effect of inclination angle of the enclosure on the resulting convection process is investigated for inclination angles ranging from 0o to 60o. The results of the present investigation show that the convective phenomenon is greatly influenced by the inclined top wall height and the dominance of the convective currents with the increase of Rayleigh number and inclination angle. The streamline and isotherm plots and the variation of the average Nusselt number at the hot left side wall are also presented. The results showed a good agreement with another published results.\u0000\u0000\u0000\u0000\u0000\u0000","PeriodicalId":123515,"journal":{"name":"Kufa Journal of Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125860282","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