In this study, a high temperature tribometer machine of pin-on-disc was designed and manufactured to examine the wear characteristics of 2024 and 7075 aluminium alloys at different wear conditions such as temperature, load, and sliding distance. The wear experiments were
carried out in a dry sliding condition at temperatures ranging from 25 to 225 °C, loads of 10, 20, and 30 N, and sliding distances of 1570, 2356, and 3141 m, with constant sliding speed of 2.6 m/s throughout the testing. The results showed that when the temperature increases, the wear due to volume loss also increases. An increase in sliding distance and load increases the wear. The Microscopic analysis and Scanning Electron Microscope (SEM) of the specimens reveals that wear traces are mostly abrasive, with just small traces of adhesive wear visibility. Furthermore, the wear process switched from mild into delamination and subsequently to severe metal wear as the load and temperature continued to increase. Because of the softening impacts of the high operating temperature, the wear mechanism takes the form of massive removal of material in a sliding direction. Due to the higher hardness of Al7075, it has higher wear resistance and lower wear (volume loss) compared to Al2024.
On Tuesday, April 18, 2023, in the presence of the Rector of the University, Prof. Dr. Edrees Muhamad Tahir Harki, the Vice Rectors, and the Dean of Erbil Medical Technical Institute held a workshop entitled “Vision Protection during Sports and Women’s Eye Health”.
After the welcoming speech by Prof. Asst. Mr.Umid Arshad Hawezi, His Excellency the University Rector welcomed the audience and said: “Before talking about the eye and the importance of the eye, I want to say that the main duty of the university is to provide science and knowledge and conduct scientific research. Fortunately, we at the Erbil Polytechnic University have served the society in various fields this year in several issues, for example, on the issue of liquefied gas explosion that created a big controversy in Kurdistan, our university organized a symposium and recommendations to the relevant parties.
Also, on the issue of floods that caused many problems for Kurdistan in general and Erbil in particular last year, the Erbil Technical Engineering College in coordination with the Youth NAP Chapter organized a symposium on how to solve flood problems for the relevant parties.
Within the framework of community service programs, we organized an international panel on the issue of the earthquake that recently caused a major humanitarian disaster in Turkey. All the issues we have mentioned are related to the assistance of the community by our university through scientific and objective, the latest information and solutions have been given to the relevant parties to solve the problems and our community will benefit more. In addition to lessons, we have opened training courses with the Ministry of Reconstruction for engineers and their employees.
Fortunately, we are gathered here today to discuss an important and sacred topic, which is the protection of eyesight, which is one of the most important human organs because 80% of general learning is through sight. There are many organizations in the world dedicated to eye protection. One of the most famous organizations in the world is the American Academy of Pediatrics, which has 32,000 members of ophthalmology, which is more than 90% of ophthalmologists.
This organization has dedicated the month of April to how to revive the issue of eye protection during sports and women’s eye protection. The Department of Eye Examination at the Erbil Medical Technical Institute is pleased to arrange this activity on this occasion.
For your information, this department is the only department in the Kurdistan Region that is dedicated to eyes. Fortunately, every hospital and clinic you visit has at least one graduate of this department, which is a great achievement for our university. Therefore, I would like to congratulate this department and wish them further success.
Finally, I hope that our eyes are protected and welcome everyone again and thank you.”
Then the workshop topics were presented by Asst. Prof. Dr. Murad Amir Ahmed, Doctor of Eye Examination and Dr. Sami Jalal Abdul Samad, Doctor of Eye Surgery explained how to maintain eye health and the causes of vision loss, cataracts and injections in children and their developments They responded to the directive.
Today, April 16, 2023, in the presence of the Dean of Erbil Technical College of Management and a significant number of college teachers and some students of the Technical Department of Accounting, a workshop entitled (Role of Accounting in Environmental Performance) was held It was presented by the following: Dr. Arshad Siddiq Abdullah Lecturer Awat Jaafar Abdulmajid Assistant Lecturer Razaw Rizgar Hassan Assistant Lecturer Naznaz Nazhat Shakir Assistant Lecturer Naz Naozad Saad al-Din The aim of the workshop was to present all the sensitive aspects of environmental protection that accounting plays an important role in connecting, which makes the environmental sector and environmental protection more efficient
Plants are grown in commercial greenhouses to enhance their quality and protect them from the effects of the natural environment, such as cold, wind and rain. In temperate climes, energy is the highest overhead expense in the production of greenhouse production. Also, the cost of fossil fuels and other traditional energy forms continues to rise. A suitable heating system at a reasonable price is essential for heating the greenhouse to provide optimum indoor conditions throughout the colder months. Flat plate solar collectors (FPSC) are one of the most environmentally friendly and energy-efficient heating solutions. In this work, the thermal performance of the FPSC for the greenhouse heating system was experimentally and numerically investigated by firstly utilizing distilled water as a working fluid and secondly using Al2O3-water nanofluid with different nanoparticle concentrations of (0.2wt.%, 0.5wt.%, 1wt.%, and 1.5wt.%) with a mean diameter of 50 nm. The simulation model was conducted using TRNSYS 18. The outcome was validated with experimental results. All configurations were fully modeled in TRNSYS, and experimental tests evaluated the inputs of the model software. As a first step, the study estimates the maximum amount of energy needed, which was 12.8 kW on the coldest day of winter (12th January 2022) according to the Erbil’s weather data, for a greenhouse located in the Scientific Research Center in Erbil, Iraq. A temperature of 23ºC was selected as the set point temperature in the greenhouse, which is essential for the experiments needed to develop several plants. This investigation followed the ASHRAE standard. The most interesting finding was that when nanofluids were used as a working fluid, the efficiency gain was larger than using water only, even with a low concentration of nanoparticles. The experimental results illustrated that using Al2O3-water nanofluid at a concentration of 0.2wt.% increase the collector efficiency by 7.9% compared to water. Furthermore, the simulation results indicate that the maximum collector efficiency was attained, which was 83.6%, when 1wt.% nanofluid was used in the FPSC, which increased the collector efficiency by 26.1% over the water case. Any additional increase in the percentage of nanoparticles reduces collector efficiency. In summary, results show that during the coldest months of the year, the system could raise the inner air temperature of the greenhouse, which is ideal for farming applications and does not pollute the environment. It was also shown that utilizing nanofluid is a profitable working fluid that decreases the cost of heating system. Additionally, adding nanofluid to the system as HTFs could produce and store more energy, which in turn increase energy produced by about 22% over the case of using water only.
