Papers by Salah Elsheikhi
Micromechanical Devices and Systems
Elsevier eBooks, Dec 31, 2016
Evaluation of multiple plastic recycling in Benghazi-Libya
Libyan Journal of Science &Technology, Sep 17, 2022
Optical Properties of Insulators
Elsevier eBooks, Dec 31, 2015
Magnetoelasticity
Elsevier eBooks, 2016
Scientific Journal of Open University - Benghazi, 2023
Today, maintaining the operations of communications firms is an essential component of their busi... more Today, maintaining the operations of communications firms is an essential component of their business management. To maximize system efficiency and reduce downtime, the management's tactics and the effectiveness of its maintenance engineers are crucial. By employing a suitable methodology that will give a framework for analyzing maintenance management and present insight into what is necessary to manage maintenance, the current study aims to evaluate and examine whether the current maintenance management system, through local companies, is qualified for a world-class level. The results of using a proposed approach; to both Almadar and Libyana companies; indicated that both of them fall within the range of fewer than 224 points. Precisely, Almadar Algadeed company gained only 219 points out of 320 points, while Libyana company gained only 182 points out of 320 points. Finally, this study may provide a framework and options to the decision-makers, allowing them to select the best way to manage their maintenance activities.
Scientific Journal of Open University - Benghazi, 2021
Noise is that annoying and harmful sound that a person cannot hear and cannot tolerate, it is a r... more Noise is that annoying and harmful sound that a person cannot hear and cannot tolerate, it is a rough, and irregular sound as it is high-frequency sound and leads to the vibration of the eardrum strongly. In this study, the noise level inside of the Al-Harabi Sweets factory in Benghazi was evaluated, and this was done by measuring the noise level of the machines in the factory (which are the vacuum, the mixer, and the twister) during the morning, and afternoon periods at two positions of each machine, and the results were analyzed by using of a T-test. Analysis of the results showed that all noise levels in this study are below 90 dB, which means that the noise levels do not affect hearing strength based on OSHA standards. The results also showed that there were some significant differences in the average values of noise levels between morning and afternoon periods for each machine in both positions. Some important points were concluded from the results and recommendations were made for any related work to be undertaken in the future.
ICBMC’14, International Conference on Biobased Materials and Composites, 2014
This paper presents an investigation aiming to determine the "best trade off" between the operati... more This paper presents an investigation aiming to determine the "best trade off" between the operating cost and product quality-through injection moulding-of glass fibre (GF) filled polypropylene (20 wt %). Two reprocessing stages were carried out using 0%, and 50% regrind materials for first, and second, reprocessing stages respectively. The factors investigated were melt temperature, screw speed, holding pressure, holding time and injection rate. Tensile strength, product geometry and operating cost were the response variables investigated. The experimental plan was based on the Box Behnken design; quadratic polynomial equations for predicting the desired responses. The results indicate that the proposed models predict the responses adequately within the limits of processing parameters being used. The regression equations were used to find optimum processing conditions for the desired criteria.
Universiti Tun Hussein Onn Malaysia Publisher’s Office, 2022
Plastic particles and other plastic pollutants exist in our environment and in the food chain and... more Plastic particles and other plastic pollutants exist in our environment and in the food chain and threaten human health. Inappropriate handling and disposal of plastic waste is a global problem and is still not resolved in many countries. When recycling companies need to deal with complex plastic, the problem becomes even more serious, which can prevent their recycling initiatives. The main purpose of this research is to determine whether recycled products can be used as post-consumer materials in various recycling ratios to produce new products without reducing quality. In the study, 0 percent, 20%, 50%, 70%, and 100 percent regrind ratios were used. Reduction, hardness, and solid density are the qualities studied. The results show that the properties did not change significantly.
Reprocessing of glass fibre reinforced polypropylene through Injection moulding: Investigation of mechanical, physical and rheological properties, 2010
An investigation is conducted to determine the effect of reprocessing, through injection moulding... more An investigation is conducted to determine the effect of reprocessing, through injection moulding, short glass fibre filled (20 wt %) polypropylene. Key mechanical and physical properties are monitored throughout the successive reprocessing phases in order to quantify the changes to the material. The fibre length is known to influence the mechanical properties and here the fibre length distribution is measured, again over the successive processing steps. This distribution is observed to show a reduction in average fibre length even within the first processing stage using virgin material. Processing parameters linked with melt plastication (screw rotation rate and back pressure) are observed to influence the average fibre length of the material entering the mould.
Reprocessing of polypropylene material through injection moulding: investigation of part quality, physical properties, processing properties and mechanical properties, 2010
We investigate the effect of the multiple injection moulding reprocessing stages of copolymer pol... more We investigate the effect of the multiple injection moulding reprocessing stages of copolymer polypropylene upon physical material properties such as mechanical stiffness and strength, melt viscosity, degradation response, colour , molecular weight along with trends observed in process related measurements. This work demonstrates that reprocessing of the material over seven successful repetitive stages is possible, where tensile test specimens are manufactured under identical moulding conditions. The reprocessing of this material has some effect upon molecular weight (-10%), shear viscosity (-11% at injection moulding shear rate range and-33% at lower shear rate) and a clear effect on melt flow rate (+43%). Mechanical properties in term of Young's modulus, elongation at yield and flexural strength have a decrease of 15%, 25% and 11% respectively. However, degradation analysis indicated that no premature degradation was noted at any stage. Little relative increase of crystallinity, density and mass over seven stages were noted, 4%, 0.48% and 0.2% respectively from virgin as a reference. Shrinkage calculations showed no considerable change over eight stages. Aesthetic "quality" was assessed through colour measurements, and insignificant change were observed up to 3 reprocessing stages, however a notable change was observed beyond this point.
The major aim of this study is to ascertain the feasibility of using recycled products in the for... more The major aim of this study is to ascertain the feasibility of using recycled products in the form of postconsumer material using different regrind ratios to produce new products without a significant reduction in product quality. Five regrind ratios were used in this study: 0%, 20%, 50%, 80% and 100%. The used products were collected from different public places in Misurata city-Libya. The properties under investigation are mass, shrinkage, color, and solid density. The results indicated to no remarkable change in the concerned properties.
Review of recent developments in polymer matrix composites with fiber reinforcements
Elsevier eBooks, 2022
Developments in the application of field-specific synthesizing of sensing technology: Civil engineering application of ground penetrating radar sensing technology
Elsevier eBooks, 2022
Assessment of Recycled Plastic Performance in The City of Zawia Libya
International Journal of Integrated Engineering
Plastic particles and other plastic pollutants exist in our environment and in the food chain and... more Plastic particles and other plastic pollutants exist in our environment and in the food chain and threaten human health. Inappropriate handling and disposal of plastic waste is a global problem and is still not resolved in many countries. When recycling companies need to deal with complex plastic, the problem becomes even more serious, which can prevent their recycling initiatives. The main purpose of this research is to determine whether recycled products can be used as post-consumer materials in various recycling ratios to produce new products without reducing quality. In the study, 0 percent, 20%, 50%, 70%, and 100 percent regrind ratios were used. Reduction, hardness, and solid density are the qualities studied. The results show that the properties did not change significantly.
The International Journal of Engineering and Information Technology, Jun 1, 2017
The major aim of this study is to ascertain the feasibility of using recycled products in the for... more The major aim of this study is to ascertain the feasibility of using recycled products in the form of postconsumer material using different regrind ratios to produce new products without a significant reduction in product quality. Five regrind ratios were used in this study: 0%, 20%, 50%, 80% and 100%. The used products were collected from different public places in Misurata city-Libya. The properties under investigation are mass, shrinkage, color, and solid density. The results indicated to no remarkable change in the concerned properties.
A holistic approach to injection moulding optimisation for product quality and cost through the characterisation of reprocessed polymeric materials and process monitoring : experimental evaluations and statistical analysis of multiple reprocessing of unfilled and short glass fibre filled polyprop...
University of Bradford, 2011
Optical Properties of Insulators
Optical properties provide an important tool for studying energy band structure, impurity levels,... more Optical properties provide an important tool for studying energy band structure, impurity levels, excitons, localized defects, lattice vibrations, and certain magnetic excitations in insulators. This requires improved understanding of quantum materials and the generation of new research techniques. This article provides a general review for insulators and optical properties, covering different topics such as exciton model and the optical spectrum, dipole–dipole interactions, the effect of spin and the interplay of exchange, participation of phonons, bands of extrinsic origin, intrinsic photoluminescence, and optical excitation.
A holistic approach to injection moulding optimisation for product quality and cost through the characterisation of reprocessed polymeric materials and process monitoring. Experimental evaluations and statistical analysis of multiple reprocessing of unfilled and short glass fibre filled polypropy...
The plastics industry is one of the fastest growing major industries in the world. There is an in... more The plastics industry is one of the fastest growing major industries in the world. There is an increase in the amount of plastic used for all types of products due to its light weight and ability to reprocess. For this reason, the reprocessing of thermoplastics and the usability of reprocessed materials are gaining significance, and it is important to produce and consume plastic materials in an environmentally friendly way. In addition, rising raw material cost linked to the increased oil prices encouraged for reusing of the plastic materials. The aim of this research was to study and optimize the injection moulding process parameters to achieve a trade-off between the product cost and product quality, measured through mechanical properties and geometry, based on using regrind ratios. The work was underpinned by a comprehensive study of multiple reprocessing effects in order to evaluate the effect of process parameters, material behaviour, reprocessing effects and possible links bet...
Libyan Journal of Science & Technology, Apr 14, 2020
Plastic recycling has gained significance and popularity over the last few decades due to environ... more Plastic recycling has gained significance and popularity over the last few decades due to environmental and economic reasons. Huge quantities of plastic products can be found in Ben-ghazi city in places such as hospitals, restaurants, schools, factories, etc. Rather than accumulating these plastic products in landfill areas, they can be recycled. Such an action preserves the environment and leads to great financial savings. This study aims to gather data on post-consumer plastic products from different locations and facilities in Benghazi. The plastics products have been classified into five types namely, PET, HDPE, LDPE, PP, and PS. The results revealed that many of the consumed products were PET. The study also reported the potential economic return of these products to some public institutions such as schools, orphanages, and the homes of the disabled. Also, the study may serve as a starting point for the municipality of Benghazi and other local authorities to improve the utilization of plastic waste and realize the significance of their economic return.
Recent International Research Efforts on Plastics and Polymeric Materials
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Papers by Salah Elsheikhi