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Study Performance of Floating Columns Subjected to Vertical Loads 垂直荷载作用下浮柱性能研究
Pub Date : 2022-07-01 DOI: 10.54388/jkues.v2i2.194
A. Bashir, Kamal Satti, Mahgoub Elhaj Mahgoub Kambal
In many cases, we need large areas in the building that are free of columns, especially on the lower floors, such as the ground floor and the basement, in order to use them as car parking or otherwise. The load path will change and new terms will appear, including the term "floating column", which is the column above the removed column, and the term “Transfer beam”, which is the beam on which the floating column is based it as a concentrated load and then transfers the loads to the adjacent columns. In this paper, the effect of vertical load on a concrete building containing a floating column has been studied and compared to another one without a floating column. Also, the results of the transfer beam were compared in a number of parameters such as moment, shear force, and deflection. A building consisting of G+4 was studied and analyzed using ETABS and Midas programs, A number of results were reached, the most important is the concept of load path redistribution, also this paper concluded that in normal buildings case all beams have an approximately equal result of bending, shear, and deflection but in floating column building the beams above the transfer beam have different values which decrease when going upward.
在许多情况下,我们需要在建筑物中大面积地使用无柱空间,特别是在较低的楼层,如一楼和地下室,以便将其用作停车场或其他用途。荷载路径将发生变化,出现新的术语,包括术语“浮柱”,即被移立柱上方的立柱,术语“转移梁”,即浮柱所依赖的梁作为集中荷载,然后将荷载转移到相邻立柱上。本文研究了竖向荷载对含浮柱混凝土建筑的影响,并与不含浮柱混凝土建筑进行了比较。此外,还比较了传递梁的一些参数,如弯矩、剪力和挠度。利用ETABS和Midas软件对一个G+4结构的建筑进行了研究和分析,得到了许多结果,其中最重要的是荷载路径再分配的概念,并得出在正常建筑情况下,所有梁的弯曲、剪切和挠度结果近似相等,而在浮动柱建筑中,转换梁上方的梁的挠度值不同,并且随着上升而减小。
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引用次数: 0
Dynamic Modelling and Simulation of A Three-Phase Gravity Separator 三相重选机的动态建模与仿真
Pub Date : 2022-07-01 DOI: 10.54388/jkues.v2i2.190
Bishoy Magdi Abdu Sabir, Ibrahim Hassan M. Elamin, Hisham Rabie Sadiq
There are many studies addressing in detail, the separation mechanisms, sizing, and design of the crude oil separation process using the horizontal 3-Phase Gravity Separators. Surprisingly, however, there are very few publications about their dynamics, modeling, and simulation. An understanding of its dynamic behavior will facilitate the design and tuning of the device that can be used to regulate the water level, oil level, and gas pressure against feed variations. This Scientific Paper presents a full mathematical analysis, modeling, and simulation using Mathworks Matlab R2016b-x64, modeling and simulation using Aspen Hysys V10 of a Crude Oil Separation Process using a horizontal 3-Phase Gravity Separator. Equations developed called Bishoy’s Equations will help to operate this device and to find many parameters and to see the effect of a parameter on others. The Assumptions are: complete phase separation, the vapor phase behaves like an ideal gas, and liquids densities are constant. Also, in practice, separators are designed with internal baffles to promote laminar flow to increase the efficiency of the separator, but it has been assumed that there are no baffles here which is a big problem but with the aid of these equations, the horizontal three-phase gravity separator can be operated at its maximum efficiency. The following parameters were determined in the equations: The height of gas, height of the water, height of oil, the height of oil when jumping the weir, the pressure of the gas (in and out), the pressure of water (in and out), the pressure of oil (in and out), and the effect of increasing  (control valve’s stem position) and decreasing  (inlet volumetric flowrate) on these parameters has been studied. This paper can change the view on oil and gas extraction and processing and can help large oil and gas companies in Europe, Asia, and Africa.
目前已有许多研究详细阐述了卧式三相重力分离器的分离机理、分级和原油分离工艺设计。然而,令人惊讶的是,很少有关于它们的动力学、建模和仿真的出版物。对其动态行为的理解将有助于设计和调整该装置,该装置可用于调节水位,油位和气体压力以应对饲料变化。这篇科学论文使用Mathworks Matlab R2016b-x64进行了全面的数学分析、建模和仿真,并使用Aspen Hysys V10对采用卧式三相重力分离器的原油分离过程进行了建模和仿真。被称为比绍伊方程的方程式将有助于操作这个装置,找到许多参数,并看到一个参数对其他参数的影响。假设是:完全相分离,气相表现为理想气体,液体密度恒定。在实际应用中,为了提高分离机的效率,在分离机上设计了内部挡板来促进层流,但这里假设没有挡板是一个很大的问题,但借助这些方程,卧式三相重力分离机可以以最大的效率运行。方程中确定了以下参数:气高、水高、油高、跳堰时油高、气压力(进出)、水压力(进出)、油压力(进出),以及增大(控制阀杆位置)和减小(进口容积流量)对这些参数的影响。本文可以改变人们对油气开采和加工的看法,并可以帮助欧洲、亚洲和非洲的大型油气公司。
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引用次数: 1
Investigation and Control of Fluidized Bed Catalytic Cracking Unit 流化床催化裂化装置的研究与控制
Pub Date : 2022-07-01 DOI: 10.54388/jkues.v2i2.173
Salma Omer, Mervat Abo Ahmed, G. A. Gasmelseed
The fluidized catalytic cracking (FCC) unit is one of the main units of the oil refinery, its objective is to upgrade heavy low-value petroleum streams into higher-value products, mainly gasoline and olefin. In this process the catalyst is circulated into the regenerator, the coke is burned, and the catalyst is regenerated. Many parameters are used to control FCC, the most important is temperature, which should be kept at (505C ) and the catalyst temperature (655 C). Other parameters are the level and flow rate of the catalyst. In this work, a control strategy was built and the transfer functions were detected, so, the characteristic equations were calculated as well as the open-loop transfer functions. Tuning, stability analysis and simulation response of the system were achieved by using Routh, direct substitution, RootLocus and bode methods
流化催化裂化装置是炼油厂的主要装置之一,其目的是将重质低价值原油转化为高价值产品,主要是汽油和烯烃。在这个过程中,催化剂循环进入再生器,焦炭被燃烧,催化剂被再生。控制FCC的参数有很多,最重要的是温度(505C)和催化剂温度(655 C),其他参数有催化剂的液位和流量。建立了控制策略,检测了传递函数,计算了特征方程和开环传递函数。采用Routh法、直接替代法、RootLocus法和bode法对系统进行了整定、稳定性分析和仿真响应
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引用次数: 0
ANN Based Location of Fault for 500KV Transmission Line in Sudan from Merowe to Atbara 基于人工神经网络的苏丹梅洛维至阿特巴拉500KV输电线路故障定位
Pub Date : 2022-07-01 DOI: 10.54388/jkues.v2i2.192
Mohammed Alnour Mustaffa, Eltahir Mohamed Hussein, Ahmed Mohammed Ishag
Today, transmission lines have become one of the important core components in systems of electrical power that are used to transport energy. Since transmission lines are prone in nature, the probability of failures in transmission lines is generally higher than that of other major components. This paper presents the fault of the transmission line from Merowe to Atbara in northern Sudan using artificial neural networks. A transmission line model was created in MATLAB R2014a using SIMULINK and SIMSCAPE with the SIMPOWERSYSTEM toolbox. The current and voltage values obtained from the transmission line model have been used as an entry for artificial neural networks. The results obtained from the proposed artificial neural networks were acceptable and the networks were found to be practically practicable for implementation. The significance of picking the most proper artificial neural network is to get the best performance from the neural networks. 
如今,输电线路已成为电力系统中用于输送能量的重要核心部件之一。由于输电线路的性质是易发的,因此输电线路的故障概率一般高于其他主要部件。本文利用人工神经网络对苏丹北部梅洛维至阿特巴拉输电线路的故障进行了分析。在MATLAB R2014a中,使用SIMULINK和SIMSCAPE工具,结合SIMPOWERSYSTEM工具箱,建立传输线模型。从传输线模型中得到的电流和电压值被用作人工神经网络的入口。所提出的人工神经网络得到的结果是可以接受的,并且该网络在实际应用中是可行的。选择最合适的人工神经网络的意义在于使神经网络的性能达到最佳。
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引用次数: 0
Pairing Relative Gain Array (RGA) and System Stability in Distillation Column 配对相对增益阵列(RGA)与精馏塔系统稳定性
Pub Date : 2022-07-01 DOI: 10.54388/jkues.v2i2.124
Mervat Sirag, Salma omer Ali, Gurashi Abdalla Gasmelseed
In this work the RGA of MIMO were obtained to pair the loops that give minimum interaction in a distillation column. Wood and Berry 2X2 and Ogunnaike and Ray 3X3 were taken as case studies: the procedure is to compute the RGA by firstly getting the matrix at s=0, this means the system is at its steady state. From the matrix obtained the inverse was calculated, from the inverse the transposed was made and the RGA was calculated by multiplying elements of transposed by elements of the matrix, from RGA the loops that gave minimum interaction were specified. The loops selected were subjected to stability analysis using Niederlinski index, the root locus analysis, bode and nyquist plots which were plotted using MATLAB software, they found to be unconditionally stable
在这项工作中,获得了MIMO的RGA来配对在精馏塔中产生最小相互作用的回路。以Wood和Berry 2X2和Ogunnaike和Ray 3X3为例进行研究:其过程是通过首先获得s=0时的矩阵来计算RGA,这意味着系统处于稳态。从得到的矩阵求逆,从逆求转置,通过转置的元素与矩阵的元素相乘计算RGA,从RGA中指定最小相互作用的环路。对选取的回路进行稳定性分析,采用Niederlinski指数分析、根位点分析、用MATLAB软件绘制bode和nyquist图,发现它们是无条件稳定的
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引用次数: 1
Evaluation of Hazards and Operability Study for Optimization Operation of Industrial Processes 工业过程优化操作的危害评价与可操作性研究
Pub Date : 2022-07-01 DOI: 10.54388/jkues.v2i2.156
Abuzar Eltieeb, Babiker Karama Abdalla, Nagmeldin Elamin
With the recent advances in technology, smart cities are rapidly earning momentum thanks to the quality of citizens' life that smart cities help improve.  To provide better lives, smart cities should host several applications to increase the efficiency and accessibility of services. Since these services involve the conveyance of significant data among the smart cities' cloud and the dwellers over the Internet, security and privacy are critical. This paper proposes an authentication protocol with a full aggregation signature to secure the smart city applications. A certificateless aggregate signature (CLAS) is used for smart city real applications such as secure routing and database outsourcing. The proposed CLAS achieves message authentication, user anonymity, constant signature size, unlinkability, and is resistant to replay attacks. Also, we have proved that the proposed scheme is resistant to all malicious adversaries. Finally, the performance evaluation results show that the proposed CLAS performs better than existing relevant schemes.
随着最近技术的进步,智慧城市正在迅速获得动力,这得益于智慧城市帮助改善公民的生活质量。为了提供更好的生活,智慧城市应该托管多个应用程序,以提高服务的效率和可访问性。由于这些服务涉及通过互联网在智慧城市的云和居民之间传输重要数据,因此安全和隐私至关重要。为了保证智慧城市应用的安全,本文提出了一种具有全聚合签名的认证协议。无证书聚合签名(CLAS)主要用于安全路由、数据库外包等智慧城市实际应用。所提出的CLAS实现了消息认证、用户匿名、签名大小不变、不可链接性和抗重放攻击。此外,我们还证明了所提出的方案能够抵抗所有恶意攻击。最后,性能评估结果表明,所提出的CLAS方案优于现有的相关方案。
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引用次数: 0
hybrid Genetic-ADAM Optimizer to Improve Disassembly Line Balancing Problem 改进拆解线平衡问题的遗传- adam混合优化算法
Pub Date : 2022-03-30 DOI: 10.54388/jkues.v1i2.167
Nadir A. siddig, Zhang Ze Qiang, Abdallah Mokhtar, Ahmed Abualnor
Modern products are designed to meet the needs of customized and short-lived products, after a short period of time, these products become waste products, these waste products are accumulating at an exponential rate, resulting in environmental degradation as a result of pollution, in order to keep this environment clean, it is necessary to have disassembly lines for those waste products, so in this research a Hybrid Genetic ADAM optimizer Algorithm was proposed to facilitate the disassembly operations at work stations placed in the disassembly lines, the proposed algorithm used to solve multi-objective disassembly line balancing problem, and Pareto optimal solution was used to determine non inferior solutions from a population. The trend of results reveal 6.1 percent a reduction in disassembly workstations, reduction of at least 0.05 percent of the idle time, reducing to minimum run time 1.5 percent comparing proposed and other meta heuristics algorithms. Furthermore, the plans of disassembly data are created to be valuable regarding trace ability and disassembly improvement processes in the future.
现代产品的设计都是为了满足定制化和寿命短的产品的需求,经过很短的一段时间,这些产品就变成了废品,这些废品正以指数级的速度积累,造成环境的恶化,污染的结果,为了保持这个环境的清洁,有必要对这些废品有拆解线,因此,本文提出了一种混合遗传ADAM优化算法,以方便拆卸线上工位的拆卸操作,该算法用于解决多目标拆卸线上平衡问题,并使用Pareto最优解从种群中确定非劣解。结果的趋势显示拆卸工作站减少了6.1%,空闲时间减少了至少0.05%,与所提出的和其他元启发式算法相比,最小运行时间减少了1.5%。此外,创建的拆卸数据计划对于将来的跟踪能力和拆卸改进过程是有价值的。
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引用次数: 2
Experimental Study for The Effect of Changing Flow on Absorption in Wetted Wall Column. 流动变化对湿壁柱吸附影响的实验研究。
Pub Date : 2022-03-30 DOI: 10.54388/jkues.v2i1.119
Mervat Sirag, Ibrahim hassan alemin Al amin, Salma omer Omer
Gas absorption is the unit operation in which one or more soluble components of gas mixture are dissolved in a liquid. The absorption may be a purely physical phenomenon or may involve chemical reaction with one or more constituents in the liquid solution. In order to obtain the highest rate of absorption, gas and liquid streams flow in opposite directions in counter-current flow. The unit in this work has been designed to help grasp the basic principles of the chemical and physical aspects involved in absorption. This study unit is made of borosilicate transparent glass in order to show the water spread in the column and get the visual distribution of fluids behavior which helps to fully understand the phenomenon. In this work, the wetted wall column is used to determine gas/liquid mass transfer coefficients, which is essential to design absorption towers. This study investigates the absorption of oxygen from air into deoxygenated water (prepared by nitrogen sparing) in liquid film controlled absorption experiment. The liquid film mass transfer coefficient is calculated at various mass flow rates of water and air. This work also studies the effect of water flow and air flow on oxygen concentration in the oxygenation and de-oxygenation process so affect on absorption process .
气体吸收是将气体混合物的一种或多种可溶组分溶解在液体中的单元操作。吸收可能是一种纯粹的物理现象,也可能涉及与液体溶液中的一种或多种成分的化学反应。为了获得最高的吸收率,气体流和液体流在逆流流动中以相反的方向流动。本单元旨在帮助学生掌握吸收过程中涉及的化学和物理方面的基本原理。本研究单元采用硼硅透明玻璃,以直观的方式显示水在柱内的分布,得到流体的分布行为,有助于全面了解这一现象。在这项工作中,湿壁柱用于确定气液传质系数,这是设计吸收塔所必需的。在液膜控制吸收实验中,研究了空气中的氧气在疏氮制备的脱氧水中的吸收。计算了水和空气在不同质量流量下的液膜传质系数。本工作还研究了在加氧和脱氧过程中水流和气流对氧浓度的影响,从而影响吸收过程。
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引用次数: 1
Structural Behaviour of Concrete-Filled Steel Tubular Stub Columns-Comparative Study 钢管混凝土短柱结构性能比较研究
Pub Date : 2022-03-30 DOI: 10.54388/jkues.v1i2.118
M. Osman, Mohammed Awad, Mahgoub Elhaj Mahgoub Kambal, Ibrahim Burhaneldain
Abstract This paper has presented details of a research project to investigate the structural behaviour of Concrete-Filled Steel Tubular (CFST) stub columns through axial load strength. Three series can be distinguished were chosen depending of the steel X-sectional area of the tubes for each series of different shape has been compared: circular, rectangular and square steel sections considering the parameters of the different types of concrete infill, i.e. normal strength concrete (NSC) or high strength concrete (HSC). It is found from these comparisons that all the codes (Eurocode part 4 (EC4), AISC-360-10 and BS5400-5) predicted conservative column strengths compared to the test results and published   theoretical method with an average ratio (0.75for EC4,0.656 for AISC-360-10 and 0.6 for BS5400-5). the main advantages of the ABAQUS software program are it gave closer predictions to the published experimental study results with an average ratio 0.96, simplicity and the savings in test time. circular CFST stub columns strength was higher than square CFST stub columns when compare rectangular and square in same series the column have higher area of concrete have higher strength.
摘要本文介绍了一项研究项目的细节,该项目旨在通过轴向载荷强度研究钢管混凝土(CFST)短柱的结构行为。根据钢管的x截面积,可以选择三个系列,每个系列的不同形状进行了比较:圆形,矩形和方形钢截面,考虑到不同类型的混凝土填充的参数,即正常强度混凝土(NSC)或高强度混凝土(HSC)。从这些比较中可以发现,所有规范(欧洲规范第4部分(EC4), AISC-360-10和BS5400-5)预测的保守柱强度与试验结果和发表的理论方法的平均比值为(EC4为0.75,AISC-360-10为0.656,BS5400-5为0.6)。ABAQUS软件程序的主要优点是与已发表的实验研究结果的预测更接近,平均比值为0.96,操作简单,节省测试时间。圆形钢管混凝土短柱强度高于方形钢管混凝土短柱,矩形和方形同系列钢管混凝土短柱的混凝土面积越大,强度越高。
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引用次数: 2
An Efficient Model to Detect and Prevent SQL Injection Attack 一种检测和防止SQL注入攻击的有效模型
Pub Date : 2022-03-30 DOI: 10.54388/jkues.v1i2.141
Abdalla Hadabi, Eltyeb Elsamani, A. Abdallah, Rashad Elhabob
SQL injection attack (SQLIA) is considered one of most threats used to attack web applications. Therefore, attackers used SQL injection vulnerability to gain ultimate access to databases that belong to applications and expose their sensitive information. Thus, attackers use SQL injections vulnerability to manipulate data also it could be used to take full control of the target machine. Accordingly, several methods were proposed in the literature to address this vulnerability widely because of its importance and high impact on the security of web applications. Thus, we propose a model to detect and prevent SQL injection attacks, which uses runtime validation to detect the occurrence of such attacks, our proposed model is adaptable to any existing system, with no need to modify the client or server and either no need to know web application source code. Furthermore, the modification independence is done by adding additional middleware between client and server. Thus, any check process is done on this middleware, and it is represented as a proxy that can do sanitize the inputs for detecting and preventing SQLIA. Furthermore, our proposed model accuracy reaches 86:6% for detecting and preventing SQLIA.
SQL注入攻击(SQL injection attack, SQLIA)被认为是攻击web应用程序最常用的威胁之一。因此,攻击者利用SQL注入漏洞获得对属于应用程序的数据库的最终访问权限,并暴露其敏感信息。因此,攻击者利用SQL注入漏洞来操纵数据,也可以利用它来完全控制目标机器。因此,由于该漏洞的重要性和对web应用程序安全性的高影响,文献中提出了几种方法来广泛解决该漏洞。因此,我们提出了一个检测和防止SQL注入攻击的模型,该模型使用运行时验证来检测此类攻击的发生,我们提出的模型适用于任何现有的系统,不需要修改客户端或服务器,也不需要知道web应用程序的源代码。此外,修改独立性是通过在客户机和服务器之间添加额外的中间件来实现的。因此,任何检查过程都是在这个中间件上完成的,并且它被表示为一个代理,该代理可以对检测和防止SQLIA的输入进行清理。此外,我们提出的模型检测和预防SQLIA的准确率达到86:6%。
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引用次数: 2
期刊
Journal of Karary University for Engineering and Science
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