ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY 2021-05-10T08:36:04+00:00 Dr. Dilan M. Rostam Open Journal Systems <p>ARO (Today in Hewramí Kurdish) is a&nbsp;scientific&nbsp;journal published by Koya University with&nbsp;e-ISSN: 2307-549X, p-ISSN: 2410-9355, and DOI: 10.14500/2307-549X.&nbsp;ARO is a journal of research articles, review articles, and letters to editor. ARO is a peer-reviewed, open access journal that publishes original works in areas of Science and Engineering. ARO has been indexed by <a href="">DOAJ</a> and got <a href="">DOAJ Seal</a>. ARO has been accepted for indexing in the Emerging Sources Citation Index (ESCI), a new edition of Web of Science™ - <a href=";Word=aro" target="_self">Clarivate&nbsp;Analytics</a> (Thomson Reuters)&nbsp;since Feb 2016.</p> Determination of Multi-performance Characteristics in Electric Discharge Machining of DIN 1.2767 Steel Using Grey Relational Analysis 2021-03-14T11:54:01+00:00 Abubaker Y. Fatatit Ali Kalyon <p>&nbsp;</p> <p>&nbsp;Electric discharge machining (EDM) is one of the most important unconventional machining processes, which can cut hard materials and complex shapes that are difficult to machine by conventional machining processes easily and with high accuracy. In this study, L18 orthogonal array combined with gray relational analysis (GRA) is implemented to investigate the multiple performances characteristics in EDM of DIN 1.2767 Tool Steel. Machining process parameters selected were discharge current (Ip), pulse-on time (Ton), pulse-off time (Toff), and electrode material (copper alloys [NSS and B2]). The investigated performances characteristics were tool wear rate (TWR) and material removal rate (MRR). Analysis of variance (ANOVA) and Taguchi’s signal-to-noise ratio with the help of Minitab-17 software were used to analysis the effect of the process parameters on TWR and MRR. The experimental results and data analysis reveal that TWR and MRR are more affected by Ip and Ton. The minimum TWR was obtained at parametric combination Ip (6A), T<sub>on</sub> (800 μs), and T<sub>off</sub> (800 μs) and the maximum MRR attained at Ip (25A), T<sub>on</sub> (800 μs), T<sub>off</sub> (200 μs), and NSS electrode. After applying GRA, the optimal parametric combination for MRR and TWR was determined as Ip (25A), T<sub>on</sub> (800 μs), T<sub>off</sub> (200 μs), and NSS electrode. The study also exhibited the occurrence of an interaction between the variables on the responses. In addition, scanning electron microscopy images showed that the metal surface was affected with the increase in T<sub>on</sub> and T<sub>off</sub>.</p> 2021-03-01T00:00:00+00:00 Copyright (c) 2021 Abubaker Y. Fatatit, Ali Kalyon Assessment of the Upstream Slope Stability of Darbandikhan Rockfill Dam during Drawdown 2021-03-14T11:55:03+00:00 Sirwan Gh. Salim Krikar M. G. Noori <p>Earth and rockfill dams face a variety of loading conditions during lifetime. One of the most critical loading conditions is the rapid drawdown of water level after steady state conditions. Rapid drawdown may cause instability of upstream slope of the dam. The present work examines the stability of a rockfill dam under different drawdown rates in terms of factor of safety for the upstream slope of the dam. For this purpose, a computer software named GeoStudio 2012 SEEP/W and SLOPE/W has been used for the numerical analysis. The results showed that the drawdown rate has a significant effect on stability of rockfill dam in which increasing the drawdown rate from 1 m/day to 10 m/day decreases the stability of the dam by 33%. Based on the outcomes, for the studied case the drawdown rate (1 m/day) can be recommended.</p> 2021-03-01T00:00:00+00:00 Copyright (c) 2021 Sirwan Gh. Salim, Krikar M. Gharrib Effect of Sand Percentage on the Compaction Properties and Undrained Shear Strength of Low Plasticity Clay 2021-03-14T11:53:59+00:00 Iyad Alkroosh Ali Al-Robay Prabir Sarker Saif Alzabeebee <p>This paper investigates the influence of sand content on the mechanical behavior of a low plasticity clay that collected from south of Iraq (Sumer town). Samples have been prepared with sand contents of 0%, 10%, 20%, 30%, and 40% of the clay weight. Standard Proctor and unconfined compression tests have been carried out and the optimum moisture content, maximum dry density, and undrained shear strength have been determined. The results show a gradual increasing trend of the maximum dry density with the increase of the sand content up to 30%. The highest dry density reaches 1.90 g/cm<sup>3 </sup>corresponding to an optimum moisture content of 12%. In addition, this paper shows that the undrained shear strength is inversely proportional to the increase of the percentage of sand. The results of this work provide a useful addition to the literature regarding the behaviour or low plasticity clay-sand mixture.</p> 2021-03-01T00:00:00+00:00 Copyright (c) 2021 Iyad Alkroosh, Ali Al-Robay, Prabir Sarker, Saif Alzabeebee Corrosion in Crude Oil Distillation Unit Overhead: A recent Case Study 2021-03-14T11:55:03+00:00 Ari A. Ahmed <p>Despite all the technological advances and the control mechanisms that exist today to achieve the control of corrosion in overhead systems in atmospheric crude oil distillation units, there is still a high level of difficulty in predicting the phenomenon due to the complexity of the chemical compounds involved in the entire process. The study of this practical case aims to determine what control mechanisms should be optimized in a refinery located in the Autonomous Region of Iraqi Kurdistan to prevent corrosion phenomena’s in this specific system and how it should be done to achieve these improvements. It has been suggested that the corrosion mechanisms by hydrochloric acid and by ammonium chloride have been those that have acted in the operational context of the mentioned facility. To test this hypothesis, a study of the unit’s operational conditions and analytical tests were carried out on the construction material of various components and the products (sediments) found inside the tower. The results show that a lack of control in the salts and sediments content of the feed crude have caused an increase in the hydrolysis process of certain components upstream of the tower and thus the generation of acids and salts was promoted. On this basis, it is necessary to optimize the primary treatment of crude oil and update the chemical treatments and washing water systems to adapt to the new conditions of the feed of the refinery.</p> 2021-03-01T00:00:00+00:00 Copyright (c) 2021 Ari A. Ahmed Feasibility Study of Concrete Louvers for High-rise Residential Buildings in Terms of Cooling Energy Requirements 2021-03-14T11:54:00+00:00 Sara Dh. Bahaadin Binaee Y. Raof Hendren Abdulrahman <p>High-rise residential buildings are increasing worldwide, including cities in the Kurdistan Region of Iraq. Therefore, creating sustainable environments in and around these residential buildings are becoming an important problem. Improving energy efficiency in buildings has received critical attention worldwide. Countries have developed national sustainability strategies that lead to the lower energy consumption while maintaining comfort, reducing energy consumption, and minimizing harmful emissions. In this paper, an analysis of the impact of external shading devices in high-rise residential buildings on energy consumption of a 13-storey building in Sulaimani city is studied. The study is focused on fixed shading elements, explaining the influence of the design of vertical and horizontal shading devices on the total energy consumption of this type of building. The results show that both a single fixed horizontal blind with a depth of 20 cm and a triple vertical shading with the same depth are considered useless. The reduction in cooling loads by two fixed horizontal louvers almost doubled compared to a single fixed horizontal shading with 20 cm. Moreover, triple fixed horizontal louvers with 40 cm have almost the same effect on reducing cooling loads as triple fixed louvers with 60 cm. On the other hand, a triple fixed horizontal shading device with 60 cm has twice the effect on reducing annual cooling loads as a triple fixed vertical shading device with 60 cm.</p> 2021-03-01T00:00:00+00:00 Copyright (c) 2021 Sara Dh. Bahaadin, Binaee Y. Raof, Hendren Abdulrahman Structural Behavior of Reinforced Concrete Beams Incorporating Foamed Glass as Aggregates 2021-03-14T11:54:00+00:00 Dawood S. Atrushi <p>Natural resources that are utilized in civil engineering applications can be saved by replacing them with some recycled materials to produce sustainable concrete with required mechanical and durability properties. In recent years, recycled glass is being used as aggregates in concrete production in many countries across the world. In the present study, the structural properties of reinforced concrete beams containing foamed glass (FG) as a partial natural coarse aggregate replacement are investigated. Five concrete mixes were employed to conduct the present study. The coarse aggregate was replaced with 0%, 25%, 50%, 75%, and 100% (by volume) of FG. Four point-loading flexural tests on beams were conducted up to failure. The results showed that the compressive strength was decreasing linearly with the increasing amount of FG. It was also observed that the ductility of the reinforced concrete beams significantly improved. However, the load-carrying capacity of the beam and load at which the first crack occurs was reduced. It was concluded that the inclusion of FG in structural concrete applications is possible and the structural behavior of concrete beams proved to be similar to that of other types of lightweight aggregate concrete such as wood and plastic aggregates used in similar structural elements.</p> 2021-03-01T00:00:00+00:00 Copyright (c) 2021 Dawood S. Atrushi The Assessment of Acoustical Characteristics for Recent Mosque Buildings in Erbil City of Iraq 2021-03-14T11:53:59+00:00 Dawa A. A. Masih Nawzad K. Jalal Manar N. A. Mohammed Sulaiman A. Mustafa <p>The study of mosque acoustics, concerning acoustical features, sound quality for speech intelligibility, and additional practical acoustic criteria, is commonly overlooked. Acoustic quality is vital to the fundamental use of mosques, in terms of contributing toward prayers and worshippers’ appreciation. This paper undertakes a comparative analysis of the acoustic quality level and the acoustical characteristics for two modern mosque buildings constructed in Erbil city. This work investigates and examines the acoustical quality and performance of these two mosques and their prayer halls through room simulation using ODEON Room Acoustics Software, to assess the degree of speech intelligibility according to acoustic criteria relative to the spatial requirements and design guidelines. The sound pressure level and other room-acoustic indicators, such as reverberation time (T30), early decay time, and speech transmission index, are tested. The outcomes demonstrate the quality of acoustics in the investigated mosques during semi-occupied and fully-occupied circumstances. The results specify that the sound quality within the both mosques is displeasing as the loudspeakers were off.</p> 2021-03-01T00:00:00+00:00 Copyright (c) 2021 Dawa A. A. Masih, Nawzad K. Jalal, Manar N. A. Mohammed, Sulaiman A. Mustafa Design and Construction of Zana Robot for Modeling Human Player in Rock-paper-scissors Game using Multilayer Perceptron, Radial basis Functions and Markov Algorithms 2021-03-14T11:32:07+00:00 Maryam Ghasemi Abdolreza Roshani Peshawa J. Muhammad Ali Farhad F. Nia Ehsan Nazemi Gholam H. Roshani <p>In this paper, the implementation of artificial neural networks (multilayer perceptron [MLP] and radial base functions [RBF]) and the upgraded Markov chain model have been studied and performed to identify the human behavior patterns during rock, paper, and scissors game. The main motivation of this research is the design and construction of an intelligent robot with the ability to defeat a human opponent. MATLAB software has been used to implement intelligent algorithms. After implementing the algorithms, their effectiveness in detecting human behavior pattern has been investigated. To ensure the ideal performance of the implemented model, each player played with the desired algorithms in three different stages. The results showed that the percentage of winning computer with MLP and RBF neural networks and upgraded Markov model, on average in men and women is 59%, 76.66%, and 75%, respectively. Obtained results clearly indicate a very good performance of the RBF neural network and the upgraded Markov model in the mental modeling of the human opponent in the game of rock, paper, and scissors. In the end, the designed game has been employed in both hardware and software which include the Zana intelligent robot and a digital version with a graphical user interface design on the stand. To the best knowledge of the authors, the precision of novel presented method for determining human behavior patterns was the highest precision among all of the previous studies.</p> 2021-03-08T20:46:02+00:00 Copyright (c) 2021 Maryam Ghasemi, Abdolreza Roshani, Peshawa J. Muhammad Ali, Farhad F. Nia, Ehsan Nazemi, Gholam H. Roshani Evaluation of Flying Ad Hoc Network Topologies, Mobility Models, and IEEE Standards for Different Video Applications 2021-05-10T08:36:04+00:00 Ghassan QasMarrogy <p>Nowadays, drones became very popular with the enhancement of the technological progress of moving devices with a connection to each other, known as Flying Ad Hoc Network (FANET). It is used in most worldwide necessary life scenarios such as video recording, search and rescue, military missions, moving items between different areas, and many more. This leads to the necessity to evaluate different network strategies between these flying drones, which are essential to improve their quality of performance in the field. Several challenges must be addressed to effectively use FANET, to provide stable and reliable transmission for different types of data during vast changing topologies, such as different video sizes, different types of mobility models, recent Wireless Fidelity standards, types of routing protocols used, security problems, and many more. In this paper, a fully comprehensive analysis of FANET will be done to evaluate and enhance these challenges that concern different video types, mobility models, and IEEE 802.11n standards for best performance, by measuring throughput, retransmission attempt, and delay metrics. The result shows that Gauss–Markov mobility model gives the highest result using Ad Hoc On-Demand Vector and lowest delay, whereas for retransmission attempts, 2.4 GHz frequency has the lowest as it can reach more coverage area than 5 GHz.</p> 2021-05-08T19:06:17+00:00 Copyright (c) 2021 Ghassan QasMarrogy