Research Paper
Investigation of Groundwater Flow Direction in Port Harcourt, Nigeria
Investigation of Groundwater Flow Direction in Port Harcourt, Nigeria

Francis J. Ogbozige; Michael A. Toko

Volume 38, 12A , December 2020, Page 1744-1750

https://doi.org/10.30684/etj.v38i12A.1754

Abstract
  The lack of reliable municipal water supply in the city of Port Harcourt has led to indiscriminate drilling of boreholes by the residents however, the direction of groundwater flow ...  Read More ...
Research Paper
Effect of ZrO2 Addition on Microstructure and Mechanical Properties of Al-Zn-Mg Alloy Matrix Composite
Effect of ZrO2 Addition on Microstructure and Mechanical Properties of Al-Zn-Mg Alloy Matrix Composite

Israa A. Aziz; Russul S. Bedien

Volume 38, 12A , December 2020, Page 1751-1757

https://doi.org/10.30684/etj.v38i12A.336

Abstract
  Aluminum – based metal matrix composite are widely used in industrial applications compared with conventional and unreinforced alloy. The composite materials usually exhibit a ...  Read More ...
Research Paper
Spiritual Energy of Islamic House in Forming Cotemporary House
Spiritual Energy of Islamic House in Forming Cotemporary House

Zainab H. Ra’ouf; Rana M. Mahdi

Volume 38, 12A , December 2020, Page 1758-1770

https://doi.org/10.30684/etj.v38i12A.583

Abstract
  The pace of daily life and its requirements are getting higher and are led by technology with its direct effects on the health of the individual. There is no doubt that its benefits ...  Read More ...
Research Paper
Safety Assessment of Hadithah Dam Under Extreme Operations and Collapsible Foundation Challenges
Safety Assessment of Hadithah Dam Under Extreme Operations and Collapsible Foundation Challenges

Imad H. Obead; Hassan A. Omran; Mohammed Y. Fattah

Volume 38, 12A , December 2020, Page 1771-1782

https://doi.org/10.30684/etj.v38i12A.611

Abstract
  The present study involves a coherence steps to re-analyze the scenario of presence of collapsible gypseous layers in the foundation of Hadithah dam under extreme operating conditions. ...  Read More ...
Research Paper
Calibration 7
Calibration 7" – Cutthroat Flume as New Size for Discharge Measurement at Free Flow Condition

Jaafar S. Maatooq; Muna J. Ibraheem

Volume 38, 12A , December 2020, Page 1783-1789

https://doi.org/10.30684/etj.v38i12A.891

Abstract
  This paper aims to conduct a series of laboratory experiments in case of steady-state flow for the new size 7 ̋ throat width (not presented before) of the cutthroat flume. For this ...  Read More ...
Research Paper
Empirical Formulas to Predict the Maximum Scour Depth With Debris Accumulation Around A Single Cylindrical Bridge Pier: An Experimental Study
Empirical Formulas to Predict the Maximum Scour Depth With Debris Accumulation Around A Single Cylindrical Bridge Pier: An Experimental Study

Mahmoud Saleh Al-Khafaji; Aysar T. Al-Awadi

Volume 38, 12A , December 2020, Page 1790-1800

https://doi.org/10.30684/etj.v38i12A.1349

Abstract
  The probability of debris accumulation near bridge piers during the heavy storm and river flood convert the hydraulic action of flow and increase the scour depth due to the reduction ...  Read More ...
Research Paper
Manufacturing of Thermal and Acoustic Insulation From (Polymer Blend/Recycled Natural Fibers)
Manufacturing of Thermal and Acoustic Insulation From (Polymer Blend/Recycled Natural Fibers)

Huda. M. khdier; Ahmed Hussein; Wafaa M. Salih

Volume 38, 12A , December 2020, Page 1801-1807

https://doi.org/10.30684/etj.v38i12A.1509

Abstract
  These works study the characterization of thermal and acoustic insulation behavior of Polymer Blend/Recycled Natural Fibers. Acoustic insulation is an important property in design criterion ...  Read More ...
Research Paper
Effect of Cracks on the Natural Frequency of Cylindrical Shell Structures
Effect of Cracks on the Natural Frequency of Cylindrical Shell Structures

Marwah . A. Husain; Mohsin A. Al-shammari

Volume 38, 12A , December 2020, Page 1808-1817

https://doi.org/10.30684/etj.v38i12A.1513

Abstract
  Shell structures are liable to different kinds of defects and damage like cracking and corrosion which may destroy their structural safety and affect the service life. The cracks' effects ...  Read More ...
Research Paper
A Sustainable Scheme for Minimizing Energy in Visual Sensor Network using Disjoint Set Cover Approach
A Sustainable Scheme for Minimizing Energy in Visual Sensor Network using Disjoint Set Cover Approach

Shuruq A. Hashim; Muna M. Jawad; Bassam M.S Wheedd

Volume 38, 12A , December 2020, Page 1818-1831

https://doi.org/10.30684/etj.v38i12A.1561

Abstract
  Directional sensors in wireless visual sensor networks attract growing attention as a promising tool for monitoring the real world; directional sensors consume energy for two main tasks: ...  Read More ...
Research Paper
Evaluating The Effects of Micro and Nano Size of Silica Filler on Asphalt Cement Properties
Evaluating The Effects of Micro and Nano Size of Silica Filler on Asphalt Cement Properties

Hussein H. Zghair; Hasan H. Joni; maan s. hassan

Volume 38, 12A , December 2020, Page 1832-1841

https://doi.org/10.30684/etj.v38i12A.1565

Abstract
  This research study examines the practicability of using micro and nano size silica to improve the asphalt characteristics. Asphalt cement penetration grade of (60 /70) was prepared ...  Read More ...
Research Paper
Prediction of Surface Roughness of Mild Steel Alloy in CNC Milling Process Using ANN and GA Technique
Prediction of Surface Roughness of Mild Steel Alloy in CNC Milling Process Using ANN and GA Technique

Hind H. Abdulridha

Volume 38, 12A , December 2020, Page 1842-1851

https://doi.org/10.30684/etj.v38i12A.1579

Abstract
  In this paper, Analysis Of Variance (ANOVA), Artificial Neural Network (ANN), and Genetic Algorithm (GA) have been studied to predict the effect of milling parameters on the Surface ...  Read More ...
Research Paper
Investigation the Effect of Negative Polarity of Surface Roughness and Metal Removal Rate During EDM Process
Investigation the Effect of Negative Polarity of Surface Roughness and Metal Removal Rate During EDM Process

Shahd A. Taqi; Saad K. Shather

Volume 38, 12A , December 2020, Page 1852-1861

https://doi.org/10.30684/etj.v38i12A.1591

Abstract
  The Electro discharge machine that named (EDM) is used to remove the metal from the workpiece by spark erosion. The work of this machining depends on the multiple variables. One of ...  Read More ...
Research Paper
Experimental and Numerical Investigation into Residual Stress During Turning Operation for Stainless Steel AISI 316
Experimental and Numerical Investigation into Residual Stress During Turning Operation for Stainless Steel AISI 316

Safa M. Lafta; Maan A. Tawfiq

Volume 38, 12A , December 2020, Page 1862-1870

https://doi.org/10.30684/etj.v38i12A.1607

Abstract
  RS (residual stresses) represent the main role in the performance of structures and machined parts. The main objective of this paper is to investigate the effect of feed rate with constant ...  Read More ...
Research Paper
Extended Meshfree Approach for Crack Statistical Analysis of Anisotropic Functionally Graded Brazilian Disc Subjected to Traction Load
Extended Meshfree Approach for Crack Statistical Analysis of Anisotropic Functionally Graded Brazilian Disc Subjected to Traction Load

Hassanein I. Khalaf; Haider K. Mehbes; Ameen A. Nassar

Volume 38, 12A , December 2020, Page 1871-1879

https://doi.org/10.30684/etj.v38i12A.1616

Abstract
  An extended meshless method that relying upon Galerkin formulation is applied on the crack analysis of orthotropic functionally graded Brazilian disc. Weak form is involved to solve ...  Read More ...
Research Paper
Optimal Quantitative Controller Design for Twin Rotor MIMO System
Optimal Quantitative Controller Design for Twin Rotor MIMO System

Mustafa K. Khreabet; Hazem I. Ali

Volume 38, 12A , December 2020, Page 1880-1894

https://doi.org/10.30684/etj.v38i12A.1618

Abstract
  In this paper, the control approach is used for achieving the desired performance and stability of the twin-rotor MIMO system. This system is considered one of the complex multiple ...  Read More ...