Pub Date : 2022-03-05DOI: 10.21608/jesaun.2022.114111.1104
Yasmin Talaat
{"title":"تقييم مدي ملائمة تصميم مسارات المشاة من أجل تحقيق إحتياجات مستخدميها دراسة حالة : الحي الأول -التجمع الخامس","authors":"Yasmin Talaat","doi":"10.21608/jesaun.2022.114111.1104","DOIUrl":"https://doi.org/10.21608/jesaun.2022.114111.1104","url":null,"abstract":"","PeriodicalId":166670,"journal":{"name":"JES. Journal of Engineering Sciences","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116771124","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}
Pub Date : 2022-03-01DOI: 10.21608/jesaun.2022.109490.1096
P. Haroon, M. Heshmat, S. Imbaby, Ahmed R. Ibrahim
The main purpose of mine workings is the exploitation of ores and minerals that are used in different aspects of life. The most common underground method all over the world is the longwall mining method. The increasing demand for minerals and ores and the difficult mining conditions at greater depths make the longwall mining system a good candidate in mining. The equilibrium condition is disrupted when the longwall face advances, and as a result, the surrounding rocks eventually fracture and cave. Moreover, the induced pressure due to caving or fractures of the immediate roof rocks and the tilting of the main roof exerts an excessive load on the hydraulic supports in the longwall faces. Induced disturbances of the overburden rocks must be thoroughly investigated since this will enhance our understanding of rock pressure and ground control. The main objectives of this paper are to review the importance of the longwall mining system as an exploitation method and its applications around the world. as well as the main factors affecting the stability of supports in longwall faces, especially hydraulic supports. From this study, it can be seen that the most important technical factor that affects face stability is the rate of face advance. In addition, the significant natural factors affecting the stability of workings are roof conditions and the geometry of the panel.
{"title":"FACTORS TO BE CONSIDERED FOR THE DESIGN OF FACE SUPPORTS IN LONGWALL MINING METHOD","authors":"P. Haroon, M. Heshmat, S. Imbaby, Ahmed R. Ibrahim","doi":"10.21608/jesaun.2022.109490.1096","DOIUrl":"https://doi.org/10.21608/jesaun.2022.109490.1096","url":null,"abstract":"The main purpose of mine workings is the exploitation of ores and minerals that are used in different aspects of life. The most common underground method all over the world is the longwall mining method. The increasing demand for minerals and ores and the difficult mining conditions at greater depths make the longwall mining system a good candidate in mining. The equilibrium condition is disrupted when the longwall face advances, and as a result, the surrounding rocks eventually fracture and cave. Moreover, the induced pressure due to caving or fractures of the immediate roof rocks and the tilting of the main roof exerts an excessive load on the hydraulic supports in the longwall faces. Induced disturbances of the overburden rocks must be thoroughly investigated since this will enhance our understanding of rock pressure and ground control. The main objectives of this paper are to review the importance of the longwall mining system as an exploitation method and its applications around the world. as well as the main factors affecting the stability of supports in longwall faces, especially hydraulic supports. From this study, it can be seen that the most important technical factor that affects face stability is the rate of face advance. In addition, the significant natural factors affecting the stability of workings are roof conditions and the geometry of the panel.","PeriodicalId":166670,"journal":{"name":"JES. Journal of Engineering Sciences","volume":"73 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114005082","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}
Pub Date : 2022-02-02DOI: 10.21608/jesaun.2022.97393.1077
nader ismael
{"title":"دراسة لعناصر الإبداع المعمارى فى تصميم مفردات العمارة الإسلامية بقصر الحمراء بالأندلس ( مملکة بنى الأحمر )","authors":"nader ismael","doi":"10.21608/jesaun.2022.97393.1077","DOIUrl":"https://doi.org/10.21608/jesaun.2022.97393.1077","url":null,"abstract":"","PeriodicalId":166670,"journal":{"name":"JES. Journal of Engineering Sciences","volume":"24 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113962422","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}
Pub Date : 2022-02-02DOI: 10.21608/jesaun.2022.111017.1100
Fatma Elnekhaily, Raghada mohamed
{"title":"تحقيق معايير الاستدامة الاجتماعية لمسارات المشاة داخل مرکز المدينة \"دراسه حاله (شارع الحسينـي البحري بمدينة المنيا ) \" Criteria for Achieving Social Sustainability for pedestrian paths in the city center Case study :Al-Hussein El Bahari Street in Minya city","authors":"Fatma Elnekhaily, Raghada mohamed","doi":"10.21608/jesaun.2022.111017.1100","DOIUrl":"https://doi.org/10.21608/jesaun.2022.111017.1100","url":null,"abstract":"","PeriodicalId":166670,"journal":{"name":"JES. Journal of Engineering Sciences","volume":"173 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116006192","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}
Pub Date : 2022-01-30DOI: 10.21608/jesaun.2022.105593.1088
Samiha E. Alharthy, O. Hodhod, T. Wei
Thermal cracks are the major problem as temperature increases in massive concrete structures. It is imperative to investigate the temperature rise and to find effective techniques to control the heat of hydration of massive concrete. In this research, based on a segmental model test of high-rise building raft, the temperature field for the bottom, middle and top surface concrete of the raft caused by the heat of hydration were measured. Blast furnace slag cement (CEM III/A 42.5N) was used due to its lower percentage of C3A and C3S and lower surface area. The tested temperature rise curves indicated that the temperature increases quickly but diminishes gradually. The maximum temperature rises at the middle surface of the concrete reached 56oC, and the maximum temperature difference between the middle and the top surface was 15.80oC. The most extreme temperature difference between the top surface and the surrounding environmental temperature was 26.5oC. So, using slag cement controlled the heat of hydration of concrete leading to environmentally friendly concrete mixes.
{"title":"Experimental Investigations on Temperature Gradient in Massive Raft Foundation","authors":"Samiha E. Alharthy, O. Hodhod, T. Wei","doi":"10.21608/jesaun.2022.105593.1088","DOIUrl":"https://doi.org/10.21608/jesaun.2022.105593.1088","url":null,"abstract":"Thermal cracks are the major problem as temperature increases in massive concrete structures. It is imperative to investigate the temperature rise and to find effective techniques to control the heat of hydration of massive concrete. In this research, based on a segmental model test of high-rise building raft, the temperature field for the bottom, middle and top surface concrete of the raft caused by the heat of hydration were measured. Blast furnace slag cement (CEM III/A 42.5N) was used due to its lower percentage of C3A and C3S and lower surface area. The tested temperature rise curves indicated that the temperature increases quickly but diminishes gradually. The maximum temperature rises at the middle surface of the concrete reached 56oC, and the maximum temperature difference between the middle and the top surface was 15.80oC. The most extreme temperature difference between the top surface and the surrounding environmental temperature was 26.5oC. So, using slag cement controlled the heat of hydration of concrete leading to environmentally friendly concrete mixes.","PeriodicalId":166670,"journal":{"name":"JES. Journal of Engineering Sciences","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133813020","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}
Pub Date : 2022-01-19DOI: 10.21608/jesaun.2022.110311.1097
M. Alqarni
Electric vehicles (EV) have several advantages over traditional internal combustion vehicles, including lower local pollution, increased energy efficiency, and reduced reliance on oil. However, in many countries, such as Saudi Arabia (SA), considerable impediments to EV exist, including a lack of charging stations. What will happen as the future government strategy is to add a large number of charging stations in this country, and what effect will this have on the grid, particularly during the charging phase? The purpose of this research is to determine the power grid's capability in Saudi Arabia to house extra demand for EV charging. This research should aid in maintaining system stability and better planning for the future EV charging infrastructure. This paper aims to outline the effect of charging EVs on the grid and predict the possible number of charging stations that can be installed for a shopping mall parking space in Jeddah city. The data were collected from daily energy consumption and energy peak demand records from a shopping mall substation, and a total of eight EV charging scenarios were simulated. The load profile was analysed for all scenarios, and as a result, 100% and 41% charging capacities are recommended for slow and fast charging methods, respectively.
{"title":"EFFECT OF THE POSITIONING OF MULTIPLE CHARGING STATIONS FOR ELECTRIC VEHICLES ON GRID PERFORMANCE IN SAUDI ARABIA: THE CASE OF JEDDAH CITY","authors":"M. Alqarni","doi":"10.21608/jesaun.2022.110311.1097","DOIUrl":"https://doi.org/10.21608/jesaun.2022.110311.1097","url":null,"abstract":"Electric vehicles (EV) have several advantages over traditional internal combustion vehicles, including lower local pollution, increased energy efficiency, and reduced reliance on oil. However, in many countries, such as Saudi Arabia (SA), considerable impediments to EV exist, including a lack of charging stations. What will happen as the future government strategy is to add a large number of charging stations in this country, and what effect will this have on the grid, particularly during the charging phase? The purpose of this research is to determine the power grid's capability in Saudi Arabia to house extra demand for EV charging. This research should aid in maintaining system stability and better planning for the future EV charging infrastructure. This paper aims to outline the effect of charging EVs on the grid and predict the possible number of charging stations that can be installed for a shopping mall parking space in Jeddah city. The data were collected from daily energy consumption and energy peak demand records from a shopping mall substation, and a total of eight EV charging scenarios were simulated. The load profile was analysed for all scenarios, and as a result, 100% and 41% charging capacities are recommended for slow and fast charging methods, respectively.","PeriodicalId":166670,"journal":{"name":"JES. Journal of Engineering Sciences","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134500793","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}
Pub Date : 2022-01-16DOI: 10.21608/jesaun.2022.104930.1086
T. Abdel-Wahed, Mohamed El Esawey, Sherif Mohamed
Many roads in hot regions of the world are exposed to very high temperatures especially in desert areas during the summer season, where the temperature could reach more than sixty Celsius degrees. Temperature variations cause a lot of distress in flexible and rigid pavement such as rutting, vertical transverse (i.e., thermal) cracking, thermal fatigue damage, blow up/buckling, in addition to generating warping stresses. Accurate detection of the surface temperature of flexible pavement is very important for pavement design analysis. This research presents a new model to estimate the temperature of flexible pavement layers under extremely high temperatures as a set of simultaneous equations. The proposed model included Clear-Sky as sub-model to estimate the solar energy of beam and diffuse radiation of the pavement surface. Ambient temperature was calculated by solving the model depending on the time of the day. The proposed model was validated via experimental data collected from one-year measurements at instrumented pavement section in New Sohag, Egypt. The asphalt surface temperatures were measured for summer, winter solstices and vernal and autumnal equinoxes. It was found that the model provides reasonable estimates compared to the experimental data. The proposed model is deemed appropriate for estimating pavement layers temperature in hot regions.
{"title":"A Simultaneous System Model to Estimate Temperature of Pavement Layers: Development and Validation","authors":"T. Abdel-Wahed, Mohamed El Esawey, Sherif Mohamed","doi":"10.21608/jesaun.2022.104930.1086","DOIUrl":"https://doi.org/10.21608/jesaun.2022.104930.1086","url":null,"abstract":"Many roads in hot regions of the world are exposed to very high temperatures especially in desert areas during the summer season, where the temperature could reach more than sixty Celsius degrees. Temperature variations cause a lot of distress in flexible and rigid pavement such as rutting, vertical transverse (i.e., thermal) cracking, thermal fatigue damage, blow up/buckling, in addition to generating warping stresses. Accurate detection of the surface temperature of flexible pavement is very important for pavement design analysis. This research presents a new model to estimate the temperature of flexible pavement layers under extremely high temperatures as a set of simultaneous equations. The proposed model included Clear-Sky as sub-model to estimate the solar energy of beam and diffuse radiation of the pavement surface. Ambient temperature was calculated by solving the model depending on the time of the day. The proposed model was validated via experimental data collected from one-year measurements at instrumented pavement section in New Sohag, Egypt. The asphalt surface temperatures were measured for summer, winter solstices and vernal and autumnal equinoxes. It was found that the model provides reasonable estimates compared to the experimental data. The proposed model is deemed appropriate for estimating pavement layers temperature in hot regions.","PeriodicalId":166670,"journal":{"name":"JES. Journal of Engineering Sciences","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123788098","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}
Pub Date : 2022-01-16DOI: 10.21608/jesaun.2022.108002.1093
Nasser A. A. Radwan
Loose sand soil is one of the problematic soils and according to that, buried pipelines interact with the loose sandy soil. Also, pipelines are subjected to additional stresses transmitted by the settlement of the loose sand soil which increases stresses and displacements in the pipes and eventually leads to breakage. Therefore, using micro-piles to improve soil below the pipeline is important. Praxis 3D numerical analysis software was used to investigate numerically the improvement of soil behaviour below pipeline Micro-piles installed as a cross piles configuration below pipeline and as a confining setup. Parameters studied are piles spacing, piles diameter, length, and effect of soil wetting. The pipeline was subjected to surface loads from a fully loaded truck. It was found that using micro-piles decreases slightly the settlement of pipelines resting on loose sands
{"title":"IMPROVEMENT OF PIPELINE SETTLEMENT USING MICROPILES","authors":"Nasser A. A. Radwan","doi":"10.21608/jesaun.2022.108002.1093","DOIUrl":"https://doi.org/10.21608/jesaun.2022.108002.1093","url":null,"abstract":"Loose sand soil is one of the problematic soils and according to that, buried pipelines interact with the loose sandy soil. Also, pipelines are subjected to additional stresses transmitted by the settlement of the loose sand soil which increases stresses and displacements in the pipes and eventually leads to breakage. Therefore, using micro-piles to improve soil below the pipeline is important. Praxis 3D numerical analysis software was used to investigate numerically the improvement of soil behaviour below pipeline Micro-piles installed as a cross piles configuration below pipeline and as a confining setup. Parameters studied are piles spacing, piles diameter, length, and effect of soil wetting. The pipeline was subjected to surface loads from a fully loaded truck. It was found that using micro-piles decreases slightly the settlement of pipelines resting on loose sands","PeriodicalId":166670,"journal":{"name":"JES. Journal of Engineering Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129903620","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}
Pub Date : 2022-01-05DOI: 10.21608/jesaun.2022.107982.1092
Emad Helal
Ahmed Hashad 1 Emad Helal 2 Abstract Slums and non-engineering buildings are scattered in Egyptian cities. Here comes the challenge facing the state, including the engineering bodies, to determine the danger level to the residents’ lives, and to develop solutions and priorities for facing risks including earthquakes. The large size of slums necessitates the development of a simplified way for classifying structures in terms of their seismic resistance. This research proposes a simplified method to estimate the earthquake loads to be used for estimating the ability of such buildings to withstand the main and seismic loads, allowing the determination of the initial degree of danger on its condition. The proposed guideline ignores the effect of participation of all columns in resisting earthquake loads, especially in the absence of lateral stiffness members, which is the general condition of slums and focuses on the external columns only that are the most exposed to the seismic load. Also, this method considers only the resulting seismic vertical reactions. The validity of the proposed method was tested experimentally and analytically, while its accuracy was verified through a field study by comparing the results of its application on two buildings in Sharika, Egypt. Numerical models for these buildings were built to determine their resistance under seismic loads. The study concluded how to predict the risks affecting such buildings using a simple process. This could be used to establish controls to replanning the buildings of existing slum cities to ensure the safety or at least reduce the risk of collapses against moderate earthquakes.
{"title":"Guidelines to estimate Earthquake Loads on Buildings in Slum Areas","authors":"Emad Helal","doi":"10.21608/jesaun.2022.107982.1092","DOIUrl":"https://doi.org/10.21608/jesaun.2022.107982.1092","url":null,"abstract":"Ahmed Hashad 1 Emad Helal 2 Abstract Slums and non-engineering buildings are scattered in Egyptian cities. Here comes the challenge facing the state, including the engineering bodies, to determine the danger level to the residents’ lives, and to develop solutions and priorities for facing risks including earthquakes. The large size of slums necessitates the development of a simplified way for classifying structures in terms of their seismic resistance. This research proposes a simplified method to estimate the earthquake loads to be used for estimating the ability of such buildings to withstand the main and seismic loads, allowing the determination of the initial degree of danger on its condition. The proposed guideline ignores the effect of participation of all columns in resisting earthquake loads, especially in the absence of lateral stiffness members, which is the general condition of slums and focuses on the external columns only that are the most exposed to the seismic load. Also, this method considers only the resulting seismic vertical reactions. The validity of the proposed method was tested experimentally and analytically, while its accuracy was verified through a field study by comparing the results of its application on two buildings in Sharika, Egypt. Numerical models for these buildings were built to determine their resistance under seismic loads. The study concluded how to predict the risks affecting such buildings using a simple process. This could be used to establish controls to replanning the buildings of existing slum cities to ensure the safety or at least reduce the risk of collapses against moderate earthquakes.","PeriodicalId":166670,"journal":{"name":"JES. Journal of Engineering Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114408311","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}
Pub Date : 2022-01-02DOI: 10.21608/jesaun.2022.110893.1099
H. Soliman
{"title":"MHD Natural Convection of grade three of non-Newtonian fluid flow between two Vertical Flat Plates through Porous Medium with heat source effect","authors":"H. Soliman","doi":"10.21608/jesaun.2022.110893.1099","DOIUrl":"https://doi.org/10.21608/jesaun.2022.110893.1099","url":null,"abstract":"","PeriodicalId":166670,"journal":{"name":"JES. Journal of Engineering Sciences","volume":"34 S137","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120835387","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：