Journal of Al-Azhar University Engineering Sector最新文献_第6页

A STUDY OF METHODS FOR PROTECTION & PREVENTION OF THE EFFECTS OF FIRES IN BUILDINGS 建筑物火灾影响的保护与预防方法研究

Journal of Al-Azhar University Engineering Sector Pub Date : 2022-10-01 DOI: 10.21608/auej.2022.266228

samar Ahmed

{"title":"A STUDY OF METHODS FOR PROTECTION & PREVENTION OF THE EFFECTS OF FIRES IN BUILDINGS","authors":"samar Ahmed","doi":"10.21608/auej.2022.266228","DOIUrl":"https://doi.org/10.21608/auej.2022.266228","url":null,"abstract":"Fires are one of the great dangers that threaten buildings and affect their occupants, as they occur as a result of the high temperature of one of the materials in the building to the point of ignition and in many cases we cannot control the fire inside the buildings, which leads to their collapse completely or partially so that this affects the efficiency of the building from a functional point of view Technical, economic. One of the most important issues related to security and safety factors in buildings, which occupies a great place in the awareness of the architect, so it is necessary to raise awareness of design considerations in order to help reduce losses and limit the fire in its place without causing damage to the rest of the building parts. Where it was identified through the research on the concept of fire from a chemical point of view and its causes, whether they are (human - natural) causes. Columns - ceilings - floors, stairs, etc). These considerations and limitations need to be moved from being a general awareness to binding laws and regulations in order to ensure the safety of lives and facilities until they are settled in the architect’s awareness. Where the research aims to highlight and clarify these determinants related to how to apply security and safety factors and apply this to the architectural design. The research concluded with a set of recommendations in which he sees the necessity of obligating the architect to take them into account in the different stages of the building, starting from the design until the desired goal is achieved. Fires cause many material and human losses This prompted the researcher to seek to study this topic and shed light on it in order to reduce the destructive effects of fires by spreading that awareness among architects.","PeriodicalId":131968,"journal":{"name":"Journal of Al-Azhar University Engineering Sector","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132635592","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: 4

OPTIMAL ALLOCATION OF CHARGING STATIONSFOR ELECTRICVEHICLE INDISTRIBUTIONSYSTEM USING ARTIFICIAL INTELLIGENCE TECHNIQUES 基于人工智能技术的电动汽车配电网充电站优化配置

Journal of Al-Azhar University Engineering Sector Pub Date : 2022-10-01 DOI: 10.21608/auej.2022.266218

M. Zaki, Tarek Mahmoud, Mohamed M. Atia, E. Osman

引用次数: 1

INVESTIGATIONS OF THERMAL COMFORT AND AIR FLOW DISTRIBUTION IN NATURALLY VENTILATED LIVING ROOM WITH A CEILING FAN 带吊扇的自然通风客厅热舒适及气流分布研究

Journal of Al-Azhar University Engineering Sector Pub Date : 2022-10-01 DOI: 10.21608/auej.2022.265714

Ahmed El Degwy, A. Aboulmagd

{"title":"INVESTIGATIONS OF THERMAL COMFORT AND AIR FLOW DISTRIBUTION IN NATURALLY VENTILATED LIVING ROOM WITH A CEILING FAN","authors":"Ahmed El Degwy, A. Aboulmagd","doi":"10.21608/auej.2022.265714","DOIUrl":"https://doi.org/10.21608/auej.2022.265714","url":null,"abstract":"In this paper, numerical analysis is used to investigate thermal comfort and airflow patterns in ventilated living rooms, including window openings and utilizing a ceiling fan. The air distribution in the living room was accurately predicted in this study using the CFD program. A five-bladed commercial ceiling fan is used to ventilate the room. The major goal of this study is to change the fan speed, fan height, and fan direction of rotation for the purpose of providing the thermal comfort conditions for individuals in the living room. Temperatures, velocities, the PPD index (Predicted Percentage Dissatisfied), and the PMV index (Predicted Mean Vote) distribution have all been taken into consideration while analyzing each case. The results showed that the best thermal comfort values are associated with fan placement in the center of the room at a height of 2.75 m from the floor at a rotational speed of 110 rpm. The overall level of thermal comfort is not significantly different whether downward-drive or upward-drive fans are used, but there is a substantial variation in the local level of thermal comfort in an occupied zone.","PeriodicalId":131968,"journal":{"name":"Journal of Al-Azhar University Engineering Sector","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129404436","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

REDUCTION OF THERMAL LOADS BY BIOMIMETIC RESPONSIVE SKINS 通过仿生反应皮肤减少热负荷

Journal of Al-Azhar University Engineering Sector Pub Date : 2022-10-01 DOI: 10.21608/auej.2022.266223

Heba Shama, M. Ismail, A. Nessim

引用次数: 0

VIRTUAL MIMO FOR VEHICULAR COMMUNICATION SYSTEMS 车载通信系统的虚拟mimo

Journal of Al-Azhar University Engineering Sector Pub Date : 2022-10-01 DOI: 10.21608/auej.2022.266220

Sara Shokry, Osama Abdelfattah, G. Mabrouk

引用次数: 0

THE EFFECT OF UNCONVENTIONAL SILLS TO DISSIPATE ENERGY DOWNSTREAM HYDRAULIC STRUCTURES 非常规技能对下游水工结构耗能的影响

Journal of Al-Azhar University Engineering Sector Pub Date : 2022-10-01 DOI: 10.21608/auej.2022.265706

Samah Mahmoud, Rania Mohamed

{"title":"THE EFFECT OF UNCONVENTIONAL SILLS TO DISSIPATE ENERGY DOWNSTREAM HYDRAULIC STRUCTURES","authors":"Samah Mahmoud, Rania Mohamed","doi":"10.21608/auej.2022.265706","DOIUrl":"https://doi.org/10.21608/auej.2022.265706","url":null,"abstract":"Water Kinetic energy downstream the hydraulic structures must be dissipated so as to stop severe scouring downstream apron and the failure of hydraulic structures. The shut block and sills with different forms are employed to disturb water and dissipate great amount of water energy through formation of a hydraulic jump in the stilling basin. Engineers have designed and used many alternative kinds of energy dissipators in order to shield hydraulic structures against scouring. The most task of the hydraulic designers is a way to dissipate a major part of water energy behind the vertical/radial gates by using more practical tools. The aim of this study is to get a better place to put the non-traditional sills to dissipate the resulting energy behind the vertical control gates. The hydraulic installations resulting from high speeds and different flows, which result in the occurrence of scour and erosion of the waterway behind these structures. The authors install a sill in several unconventional forms and study the efficient in dissipating kinetic energy. downstream hydraulic structures by installing it on relative dimensions of the gate L b / L f . Where Lf is that the length of the floor, Lb, distance from the gate, this was achieved to see the simplest position of the sill, aiming to reach the most energy dissipation and also the minimum length for the hydraulic jump. Experimental study has been conducted in glassed wall flume with square cross section of (30 cm x 30 cm) and length of 4.00 m with transparent vertical sides, located in hydraulic lab Faculty of Engineering - Al-Azhar University in Cairo, levels and water depths are measured. As well as the levels and depths of scour within the channel sector. The effect of the sill on different positions was investigated and also the results were discussed. It was found that the best place to install the sill to dissipate the energy within the middle length of the floor and also the most effective ratio is (Lb / Lf) = 0. 50.","PeriodicalId":131968,"journal":{"name":"Journal of Al-Azhar University Engineering Sector","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134205373","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

STRUCTURAL DESIGN MODEL AND ECONOMIC FEASIBILITY OF USING CONCRETE FILLED GLASS FIBER REINFORCED EPOXY TUBE COLUMNS 玻璃纤维增强环氧树脂混凝土管柱结构设计模型及经济可行性

Journal of Al-Azhar University Engineering Sector Pub Date : 2022-10-01 DOI: 10.21608/auej.2022.265711

H.A. Kottb

{"title":"STRUCTURAL DESIGN MODEL AND ECONOMIC FEASIBILITY OF USING CONCRETE FILLED GLASS FIBER REINFORCED EPOXY TUBE COLUMNS","authors":"H.A. Kottb","doi":"10.21608/auej.2022.265711","DOIUrl":"https://doi.org/10.21608/auej.2022.265711","url":null,"abstract":"Structural design of Concrete Filled Tube CFT columns requires defining an appropriate thickness and material of confining tube. The Glass Fiber Reinforced Epoxy GFRE is a sustain material that provides resistance against salt and sulphates. Experimental program of circular CFT columns was carried out to verify the applicability of the ACI provisions using available local materials, which consists of six specimens divided into two groups: reinforced and un-reinforced CFT columns, studied parameters were: compressive strength of CFT columns, axial strain, hoop strain, load – strain behavior, and failure behavior. It was found that satisfying the ACI requirements achieves a conservative evaluation of CFT ultimate compressive strength and axial strain of concrete with average factor of safety of 2.15 in predicting compressive strength. An applicable design model proposed depending on ACI 318 [3] and ACI 440.02 [4] specification, providing reasonable prediction of confined concrete strength 𝑓 𝑐𝑐′ and the size effect of CFT columns. Also, an economic study of using CFT columns based on volume of its peer reinforced concrete was made to assure its economic feasibility comparing to the traditional reinforced concrete columns.","PeriodicalId":131968,"journal":{"name":"Journal of Al-Azhar University Engineering Sector","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127019009","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

STATISTICAL SPATIAL ANALYSIS OF TRAFFIC ACCIDENTS IN THE STATE OF CONSTANTINE USING GEOGRAPHIC INFORMATION SYSTEMS(GIS) 基于地理信息系统(gis)的君士坦丁州交通事故统计空间分析

Journal of Al-Azhar University Engineering Sector Pub Date : 2022-10-01 DOI: 10.21608/auej.2022.266230

Abdelali Benchenna, Benmissi Achene, Bencherif Houria

{"title":"STATISTICAL SPATIAL ANALYSIS OF TRAFFIC ACCIDENTS IN THE STATE OF CONSTANTINE USING GEOGRAPHIC INFORMATION SYSTEMS(GIS)","authors":"Abdelali Benchenna, Benmissi Achene, Bencherif Houria","doi":"10.21608/auej.2022.266230","DOIUrl":"https://doi.org/10.21608/auej.2022.266230","url":null,"abstract":"Traffic accidents are considered one of the most important mortality factors in Algeria, because it has significantly increased in recent years, leaving important human and material losses that exceed those caused by natural disasters, diseases, and epidemics. Also, its connection with several variables such as the geographical dimension, communities, and the quality of vehicles and roads has contributed to the exacerbation of the phenomenon, Therefore, it is necessary to think about searching for tools that contribute to alleviating the phenomenon of traffic accidents, and among these tools is the geographic information system (GIS). In this research, we are going to study and analyse the traffic accidents that occurred between 2019 and 2021 in Constantine Province, to know their spatial distribution and the extent of their dispersion and propagation. We have used the spatial analysis tools (distribution direction, the nearest neighbor method, distribution density…etc). Through it, we concluded that the traffic accidents are concentrated in the municipality of Constantine, which has high economic activities. By knowing these concentrations, we can take the appropriate decision to reduce traffic accidents.","PeriodicalId":131968,"journal":{"name":"Journal of Al-Azhar University Engineering Sector","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115648776","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 STEEL FIBER CONTENT ON COMPRESSIVE STRENGTH OF HIGH STRENGTH CONCRETE WITH OR WITHOUT NANO-SILICA 钢纤维掺量对加与不加纳米二氧化硅高强混凝土抗压强度的影响

Journal of Al-Azhar University Engineering Sector Pub Date : 2022-10-01 DOI: 10.21608/auej.2022.265707

L. Sadek, Hazem Abd El-latif, Mohammed Abd El-Sattar

{"title":"EFFECT OF STEEL FIBER CONTENT ON COMPRESSIVE STRENGTH OF HIGH STRENGTH CONCRETE WITH OR WITHOUT NANO-SILICA","authors":"L. Sadek, Hazem Abd El-latif, Mohammed Abd El-Sattar","doi":"10.21608/auej.2022.265707","DOIUrl":"https://doi.org/10.21608/auej.2022.265707","url":null,"abstract":"During the past few years, high-strength concrete (HSC) has been increased interest amongst civil and structural engineers. On the Other hand, several varieties of fiber-reinforced concretes are now utilized in the building sector for a variety of purposes. This paper discusses the influence of using steel fiber on the compressive strength and splitting strength of high strength concrete with Nano-silica (NS) and/or silica fume (SF). The experimental effort consists of casting and testing 16 distinct mixes. All of the mixes have the same cement content, and some have the same water content and aggregate content, but they differ in factors such as the quantity of NS, SF, and steel fiber. The mixes have been categorized into three main groups. In group one, the impact of adding 3% SF and/or 2% NS was investigated. In group two, the effect of adding 10% SF and the sources of type F admixtures was studied. In group three, two subgroups to study the effect of adding 5% SF, as well as the effect of w/c ratio were considered. As a results, it is established that the average compressive strength of mixes containing fibers to the compressive strength of samples without fibers at 7, 28 and 56 days is 1.04, 1.0 and 1.12, respectively. The average ratio of splitting strength to compressive strength at 28 days is around 7.22%.","PeriodicalId":131968,"journal":{"name":"Journal of Al-Azhar University Engineering Sector","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121724831","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 SIMULATION FOR SEAWATER AIR PRECOOLER 海水空气预冷器的数值模拟

Journal of Al-Azhar University Engineering Sector Pub Date : 2022-10-01 DOI: 10.21608/auej.2022.265713

Husain Etaiwe, R. Sakr, M. Salem, H. Abdelrahman

{"title":"NUMERICAL SIMULATION FOR SEAWATER AIR PRECOOLER","authors":"Husain Etaiwe, R. Sakr, M. Salem, H. Abdelrahman","doi":"10.21608/auej.2022.265713","DOIUrl":"https://doi.org/10.21608/auej.2022.265713","url":null,"abstract":"The low-temperature seawater is an important renewable source used for direct and indirect seawater air conditioning. In the northern Arabian Gulf, the water depth is insufficient for direct seawater air conditioning. So, for such circumstances, seawater can be utilized as an auxiliary for precooling the returned air from the conditioned space. In this study, a two-dimensional numerical simulation model of crossflow for a 20-tube bank in a staggered arrangement with a /D as 1.5 and 1.25 T /D and S L , with the pitch ratio S investigated diameter of 25 mm was C, and o from 2 to 5 m/s, the air inlet temperature is 28 d . The air inlet velocity range respectively . considered was C o e of 21 seawater temperatur This paper summarized the numerical study to predict the performance of a heat exchanger an as air precooler by utilizing the seawater as a cold stream. The effect of tube bank arrangement is also investigated. ANSYS 20 was applied for the numerical simulation, and the best results efficiency the that resulting in C o 22.75 air precooling coil is the obtained of the temperature after of the air conditioning system maximum improvement by 37.5 %.","PeriodicalId":131968,"journal":{"name":"Journal of Al-Azhar University Engineering Sector","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131167275","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