Noorhafiza Muhammad
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Preferred name
Noorhafiza Muhammad
Official Name
Noorhafiza, Muhammad
Alternative Name
Muhammad, N.
Muhammad, Noorhafiza
Muhammad, Noorhafiza Binti
Muhamad, N.
Main Affiliation
Scopus Author ID
36473624500
Researcher ID
D-8515-2015

Research Output

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A review on additive manufacturing in bioresorbable stent manufacture

2021-07-21 , Noorhafiza Muhammad , Azli A.A. , Mohd Shuhidan Saleh , Midhat Nabil Ahmad Salimi , Mohd Fathullah Ghazli@Ghazali , Shayfull Zamree Abd. Rahim

Vascular injury and disease as well as cardiac and cardiovascular diseases have been a serious threat to human life and health today. Stents implantation have been the primary treatment for vascular diseases. Polymeric bioresorbable stents manufactured with 3D printer is newly emerged. This work review the bioresorbable stents and the utilization of additive manufacturing in bioresorbable stent manufacture.

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Experimental study on laser welding dissimilar materials

2021-07-21 , Noorhafiza Muhammad , Yap How Hean , Mohd Shuhidan Saleh , Midhat Nabil Ahmad Salimi , Mohd Fathullah Ghazli@Ghazali , Muhamad Farizuan Rosli

Laser welding on dissimilar materials is widely used and has significance application in industry. Laser welding is the one of the method which can offer high strength of joint especially for joining of dissimilar metals contrast to conventional method. Conventional welding more often had an insufficient penetration depth and a wider heat affected zone which prompts to reduce joint quality. This work exhibits a weld possibility on low carbon steel and high carbon steel surface utilizing low power fiber laser in pulse wave modes. The objective of this research work is to investigate the influence of laser welding parameters of welding speed and pulse width on weld geometry of the welded metal. The parameters used is the welding speed (1.67 mm/s to 8.33mm/s) and pulse width (3 ms to 5 ms). The optimum weld geometry was with the largest aspect ratio (1.42) with parameter of welding speed (1.67 mm/s) and pulse width (3.0 ms). As conclusion, appropriate utilization of parameters can improve the quality of weld joints and durability of products.

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Printing parameter optimization of stent length accuracy by using Response Surface Methodology (RSM)

2021-05-03 , Amirul Asyraf Azli , Noorhafiza Muhammad , Mohd. Mustafa Al Bakri Abdullah , Mohd Fathullah Ghazli@Ghazali , Shayfull Zamree Abd. Rahim , Mohd Shuhidan Saleh , Victor S.A.

The demand for coronary artery stents keeps rising every year with a higher quality, lower cost, faster and economical process. Due to its availability relatively low-cost price and adaptability, Polylactic-acid (PLA) has been identified as an ideal material for biodegradable stents. Previously, laser micromachining was widely used for processing coronary stent but this manufacturing process required high investment. Apart from that, this process was unpractical and unfeasible to be machined with certain material and complex design. Alternatively, FDM 3D printing emerges as a system for producing stent and gained attention for its low cost, high reliability, simple operation, flexibility and has shown potential as promising solutions in stents fabrication. Stent length is one of the key aspects in stents manufacturing. In this work, optical microscope is used to measure the stent characterizations while processing parameter optimization was performed by using Response Surface Methodology (RSM). Printing orientation affects the stent length dimensional accuracy. Both XY and ZX are capable to develop PLA stents but XY-orientation is the ideal printing orientation as it provides good dimensional precision for stent characterizations and a lower risk for the structure and geometry to be sagging.

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Survey on customer needs of wheelchair design for big size patient

2023-04-24 , Ibrahim W.A.R.A.W. , Muhamad Farizuan Rosli , Mohd Effendi Muhammad Suandi , Noorhafiza Muhammad , Sung C.

This paper presents a survey on customer needs on wheelchair design for big size patient weight maximum up to 150kg. As more patients who are overweight are admitted to hospitals, critical care nursing care become more important. In order to design new type of wheelchair for big size patient, customer's needs requirements are very important in early development process. It firmly identified with idea age, idea choice, aggressive benchmarking and foundation of item determinations. The data obtained from this survey is very useful for designer in designing of new type wheelchair for big size patient, which currently not available or very difficult to find in the market.

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Characterization and qualitative analysis of pectin from kepok banana peels

2020 , Halifah Pagarra , Anna Y. Hartati , Andi Bida Purnamasari , Noorhafiza Muhammad

The purpose of this study was to determine the quality and characteristics of pectin in Kepok banana peel using extraction methods. The study refers to the results of optimization (CCD) of pectin with optimum conditions for pectin extraction results predicted at pH (2.5), time and temperature (100 °C). Under optimal conditions, the actual pectin yield was 22.57%. The parameters used are equivalent weight, methoxyl content, galacturonase levels and degree of esterification, qualitative analysis of simple sugars and FTIR characteristics. The results obtained the equivalent weight level of 862.07g/mol, methoxyl content of 3.6% and galacturonic levels or pectin purity of 77.44% and esterification degrees 37.17%. The results of the qualitative analysis of monosaccharides from kepok banana peels pectin showed the presence of arabinose, cellulose, maltose, galactose, fructose and glucose. FTIR characterization results show that functional groups consisting of alcohol groups at 3437cm-1, C-H groups at 2920.32cm-1, C=O groups at 1735.99cm-1, cyclic C-C groups at 1145.75cm-1 and C-O groups at 1016.52cm-1. FTIR spectroscopy with each absorption at a certain wave number shows conformity to the structure of pectin.

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Analysis of sugarcane juice extractor mechanism

2023-04-24 , Ibrahim W.A.R.A.W. , Muhamad Farizuan Rosli , Mohd Effendi Muhammad Suandi , Noorhafiza Muhammad , Rosli N.H. , Hadi N.H.A.A. , Ayasing I.M. , Aznan S.N.

This paper presents an analysis of the mechanism of gears and belt system of Small Sugarcane Juice Extractor machines. The existing design of sugarcane extractor consists of two rollers with the pulley system connected by V-belts. The power generated by the motor will be transmitted from the wheel to the gears and finally the rotating shaft. The rollers will tear then press the sugarcane to extract the juices. The need for the mechanism analysis is necessary to obtain information on existing design for future development of a new version of extractor machine. This is due to currently available sugarcane juice extractors requiring high energy to power bulk and heavy roller mills that are mechanically driven. The analysis is focused on gears, belt and roller as well as the weakness, advantages and disadvantages of the existing extractor.

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Design and development of fire escape window grille keyless locking system

2021-07-21 , Mohd Shuhidan Saleh , Ng Kuan Yee , Noorhafiza Muhammad , Muhamad Farizuan Rosli , Mohd Fathullah Ghazli@Ghazali , Norshah Afizi Shuaib

The most fire-related fatalities are due to the smoke inhalation of the toxic gases. It is related to the victims being trapped in the building when the building was on fire. It was also reported that major deaths from fire related are from the toxic gases inhalation produced by the fire while the deaths due to fire flames and burning was about one third of the total deaths. The access to the exit door was blocked and they could not exit through the window due to the permanent grille installation. It was well aware that most Malaysian homeowners installed grilles on their house windows or doors for security reason since there are lots of break-ins incidences. To overcome the issue, this work introduces a window grille with keyless locking system. The design incorporated keyless system that can be operated or opened without a key. Several designs for implementing this solution have been described. These designs are divided into three sections, which is a grille design, expansion designs which use to accommodate a wide range of window-sized and keyless locking systems. The size and type of grille suitable for Malaysian residents as well as the more efficient keyless locking system has been studied in detail using the method of case study and survey method. Step of patent research, market analysis and benchmarking are used as methods for collecting reference data. The most effective fire escape window grille keyless locking system has been studied and designed from this project. An important factor in designing a fire window grille is the design that can be opened and does not require a key operation. The results of the design and analysis tested are presented such that they can be used as an aid to the design of fire escape features.

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Profiles of blades and paddles for turbines with geometric design inspired by nature

2020 , G. Poteraş , György Deák , M. V. Olteanu , I.-F. Burlacu , C. Sîrbu , Noorhafiza Muhammad , Nurul Aida Mohd Mortar

Exploitation of the main renewable energy sources (hydraulic, wind and solar radiation) in different installations involves the use of considerable surfaces, whether they are located on land or on water, having a negative impact on the environment. With the aim to dispose this deficiency, an installation that captures and integrates the three renewable resources has been proposed and patented. Therefore, their simultaneous exploitation in order to obtain electricity has the highest efficiency per unit area. In the laboratory, an installation was built and tested that integrates all three sources of renewable energy: The movement of water currents from flowing waters, the movement of air currents and solar radiation. Improvements that have been made to this pilot installation regarding the efficiency increasing of blades will be presented in the present communication, being analyzed the performance of using the profile blades with geometry inspired by nature.

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DFMA method: Analysis on a mechanical sharpener

2021-07-21 , Muhamad Farizuan Rosli , Noorhafiza Muhammad , Shayfull Zamree Abd. Rahim , Mohd. Nasir Mat Saad , Mohd Fathullah Ghazli@Ghazali , Shafeeq Ahmad Shamim Ahmad

Creativity and innovation in any organization are vital to its successful performance. Innovate a product have to consists of many different process of design. The flow of design such as identifying the problem of the product, determining the objective of the research, identifying the customer needs, undergoing survey and analysis data to get the list of metrics. Besides that, house of quality and concept generation will help the research to get know whether the design is full fill the customer needs or not. Concept testing will help to identify the final concept selection. Modelling of the final concept can help to show the target marketing to give their own response on this research. Customer needs can help to make the product undergo further improvement.

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Key features of additive manufacturing: A review

2021-07-21 , Noorhafiza Muhammad , Azli A.A. , Mohd Shuhidan Saleh , Midhat Nabil Ahmad Salimi , Mohd Fathullah Ghazli@Ghazali , Shayfull Zamree Abd. Rahim

This work reviews the key features and capabilities of additive manufacturing, which include the fundamental of additive manufacturing followed by types of additive manufacturing technologies. Advantages and limitation of additive manufacturing is discussed and the emergence of additive manufacturing in industrial revolution 4.0 is presented. Economy benefits through the additive manufacturing showing beneficial potential.

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