Volume 15 (2022)
Volume 14 (2021)
Volume 13 (2020)
Volume 12 (2019)
Volume 11 (2018)
Volume 10 (2017)
Volume 9 (2016)
Volume 8 (2015)
Volume 7 (2014)
Volume 6 (2013)
Volume 5 (2012)
Volume 4 (2011)
Volume 3 (2010)
Volume 2 (2009)
Volume 1 (2008)
A GWO-PID controller with advanced optimization features for DC-DC converters

Muhanad D. Hashim Almawlawe; Hassan H. Naji; Al-Sharify Mushtaq Talib; Wali H. Wali

Volume 16, Issue 4 , December 2023, Pages 228-232

https://doi.org/10.30772/qjes.2023.180482

Abstract
  This work seeks to use both traditional control algorithms and advanced optimization algorithms to enhance the performance of a DC-DC converter. The chosen algorithm was Proportional-Integral-Derivative (PID) based on gray wolf optimization (GWO). The PID controller is known for its ease of control and ...  Read More

The impact of IMS mobility management with google mobile phone on quality of experience

Nadia Awad; Musa H. Wali

Volume 16, Issue 4 , December 2023, Pages 233-238

https://doi.org/10.30772/qjes.2023.145192.1060

Abstract
  The widespread of a Wireless Local Area Network (WLAN) access network in residential areas provides low-cost and high-speed access to the Third-Generation Partnership Project (3GPP) services for end users. This has virtually made WLAN to be a complementary access network to Universal Mobile Telecommunications ...  Read More

Develop A new mathematical approach to predict the crack propagation rate in a thin plate subjected to in-plane biaxial loading

Israa Abed Al.Razak Mosleh; Fathi Alshamma

Volume 16, Issue 4 , December 2023, Pages 239-246

https://doi.org/10.30772/qjes.2023.142855.1023

Abstract
  The mechanical design of metals must deal with structures collapsing due to cracks occur in the material. This study focused on the edge crack at non-proportional cycle loading because it propagates quickly. This research attempted to determine two mathematical models that could predict the crack propagation ...  Read More

Experimental study on refrigerant mixing as a drop-in substitute for R134a in a domestic refrigerator

Mohammed F. Mohammed; Maathe A. Theeb

Volume 16, Issue 4 , December 2023, Pages 247-252

https://doi.org/10.30772/qjes.2023.145058.1054

Abstract
  This research aims to find ways to use different mixtures instead of R134a refrigerants that are more efficient and better for the environment. The Kyoto Protocol states that hydrofluorocarbon refrigerants must be replaced due to their high Global Warming Potential values, contributing to environmental ...  Read More

Assessing the effectiveness of low-cost materials to act as filter media for phosphate sorption

Ali T Alzeyadi; Nadhir Abbas Al-Ansari; Ali Al-Attabi; Muhanad Mosa

Volume 16, Issue 4 , December 2023, Pages 253-258

https://doi.org/10.30772/qjes.2023.141371.1001

Abstract
  In this research, an assessment was conducted for several materials to examine their efficiency for sorption phosphate and their potential use as filter media. This work focuses on seeking materials that can achieve high, rapid, and robust phosphate retention. To assess the phosphate removal efficiency, ...  Read More

Functional Performance of Octagonal Plan Mosques-Analysis of Octagonal Plan Mosques in Mosul

Ali Faris Younis; Hassan Mahmood Kasim

Volume 16, Issue 4 , December 2023, Pages 259-267

https://doi.org/10.30772/qjes.2023.143868.1041

Abstract
  The identity of Islamic cities is distinctly manifested through their congregational mosques, primarily characterized by their continuous and stable function, epitomized by the five daily congregational prayers. The performance of a mosque is intricately linked to a set of religious, organizational, ...  Read More

The assessment of using fiber produced from plastic broom bristles on the impact property of normal-weight concrete slabs

Zayd A. Abdullah Al-Obaidi

Volume 16, Issue 4 , December 2023, Pages 268-272

https://doi.org/10.30772/qjes.2023.180346

Abstract
  The importance of plastic has emerged in many modern industries, and petroleum is an essential source for the manufacture of many materials of importance in our contemporary life, such as plastic bags, paints, brooms that are used for cleaning, and others. This study showed that it is possible to use ...  Read More

Statistical analysis of the vacuum solar collector using the analysis of ‎variance method

Marwa M. Majeed; Basima S. Khalaf; Layla M. Nassir

Volume 16, Issue 4 , December 2023, Pages 273-278

https://doi.org/10.30772/qjes.2023.180350

Abstract
  Space and weight constraints, as well as the time lag between energy generation and consumption, ‎are major obstacles to expanding solar water heating systems into existing structures with limited ‎space. It is possible to collect heat with this small, evacuated tube collector (ETC). It was found ...  Read More

Experimental study of heat transfer using nanofluids in a coiled agitated vessel equipped with impeller propeller

Batool Shandal; H. Dawood; Helen Onyeaka

Volume 16, Issue 4 , December 2023, Pages 279-288

https://doi.org/10.30772/qjes.2023.145214.1062

Abstract
  In this study, the heat transfer enhancement was made by using multiwalled carbon nanotubes (MWCNTs) with distilled water (i.e . nanofluid) in a coiled agitated vessel. The thermal conductivity of the nanofluid at a volume fraction of (0.3 Vol%) was estimated with different parameters (temperature, propeller ...  Read More

Numerical study of effect porous media on heat transfer in a horizontal annular tube

Doaa Rokan Hussien; Muna S. Kassim; Mustafa Fouad Yousif

Volume 16, Issue 4 , December 2023, Pages 289-297

https://doi.org/10.30772/qjes.2023.143069.1028

Abstract
  In the current study, to enhance the characteristics and forced convection performance in the horizontal annular in the case of the presence of porous material and without porous material, energy analyses were performed. Many types of porous material, porosities, and diameters were used. Computational ...  Read More