Alina Rahayu Mohamed, Assoc. Prof. Dr.
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/39321
This page provides access to scholarly publication by UniMAP Faculty members and researchers.2024-03-28T20:22:55ZTotal Nitorgen Content from Earthworm (Eisenia Foetida) Using The Kjeldahl Method
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/68509
Total Nitorgen Content from Earthworm (Eisenia Foetida) Using The Kjeldahl Method
Zarina, Zakaria; Alina Rahayu, Mohamed; Noor Hasyierah, Mohd Salleh; Siti Nursheela, Abu Mansor
In the fish aquaculture management, fish feed is identified as a major problem. The high cost and scarcity of fishmeal in formulated feeds have led to the use of other protein sources such as earthworms and animal by-product. Earthworm is an alternative source of protein to replace the fish meal in the fish feed formulation. In this study, total nitrogen content in the earthworm powder is determined using the Kjeldahl method by employing the statistical software, Full Factorial Design (FFD) which could provide the significant information about the studied parameters. The parameters are, the digestion time (min) and the volume of sulfuric acid (H2SO4) (ml). From the analysis of variance (ANOVA), the volume of H2SO4 and the interaction between digestion time and the volume of H2SO4 are found to be important parameters in the nitrogen determination process via the Kjeldahl method. The highest nitrogen content obtained was 12.23%, when using 15 ml H2SO4 and 60 mins of digestion time. The value of R2 is 0.9986, which shows that the selected parameters (the digestion time and the volume of H2SO4) and its corresponding levels are highly correlated to the percentage nitrogen content in earthworm powder using the Kjeldahl method.
Link to publisher's homepage at https://journals.iium.edu.my/
2013-01-01T00:00:00ZOptimization of the pyrolysis process of empty fruit bunch (EFB) in a fixed-bed reactor through a central composite design (CCD)
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/42213
Optimization of the pyrolysis process of empty fruit bunch (EFB) in a fixed-bed reactor through a central composite design (CCD)
Alina Rahayu, Mohamed; Zainab, Hamzah; Mohamed Zulkali, Mohamed Daud
The production of crude palm oil from the processing of palm fresh fruit bunches in the palm oil mills in Malaysia hs resulted in a huge quantity of empty fruit bunch (EFB) accumulated. The EFB was used as a feedstock in the pyrolysis process using a fixed-bed reactor in the present study. The optimization of process parameters such as pyrolysis temperature (factor A), biomass particle size (factor B) and holding time (factor C) were investigated through Central Composite Design (CCD) using Stat-Ease Design Expert software version 7 with bio-oil yield considered as the response. Twenty experimental runs were conducted. The results were completely analyzed by Analysis of Variance (ANOVA). The model was statistically significant. All factors studied were significant with p-values < 0.05. The pyrolysis temperature (factor A) was considered as the most significant parameter because its F-value of 116.29 was the highest. The value of R2 was 0.9564 which indicated that the selected factors and its levels showed high correlation to the production of bio-oil from EFB pyrolysis process. A quadratic model equation was developed and employed to predict the highest theoretical bio-oil yield. The maximum bio-oil yield of 46.2 % was achieved at pyrolysis temperature of 442.15 °C using the EFB particle size of 866 μm which corresponded to the EFB particle size in the range of 710–1000 μm and holding time of 483 seconds.
Link to publisher's homepage at http://scitation.aip.org/
2014-01-01T00:00:00ZAn experimental investigation of palm pressed fibre waste as lubricant in strip drawing
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/39948
An experimental investigation of palm pressed fibre waste as lubricant in strip drawing
Mohd Hafis, Sulaiman; Mohd Ridzuan, Mohd Jamir; Alina Rahayu, Mohamed; N. Farahana, R.; Syahrullail, Samion, Assoc. Prof. Dr.
The abundance of palm pressed fibre (PPF) biomass waste generates greenhouse gases. Therefore, an experimental study on catalytic pyrolysis technology using a tubular reactor on PPF oil was performed at temperature of 450 °C, which gave oil product yields of 44.1 percent. Viscosity of the PPF oil as a function of temperature was measured at different temperatures ranging from 25 °C to 50 °C. The viscosity of the oils was shown to decrease with increases in temperature. Finally, PPF oil was tested as lubricant in strip drawing and compared with palm olein (PO). A comparison of strip drawn aluminium samples show that the lubrication performance of PPF oil varies with PO in a remarkably similar way.
Link to publisher's homepage at http://www.penerbit.utm.my/
2014-01-01T00:00:00ZEffect of surface roughness of pure aluminium A1100 on the cold work extrusion by using different angles of taper die
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/32717
Effect of surface roughness of pure aluminium A1100 on the cold work extrusion by using different angles of taper die
Mohd Ridzuan, Mohd Jamir; Mohd Hafis, Sulaiman; Azduwin, Khasri; Alina Rahayu, Mohamed; N. Fitriah, Suhaimi; Mohd Shahril, Shariff
The study presented in this paper is focused on the effect of surfaces roughness of pure aluminium A1100 on the cold work extrusion process by three different angles of taper die. Different angles of taper die will affect the surface roughness of the workpiece. To protect the surface and to reduce friction, lubricants are often used in extrusion process [1]. Different lubricants may have different optimum taper die angle that are suitable to be applied. Two types of materials used in this experiment are steel SKD 11 for taper die and aluminium A1100 for workpiece and different angles applied are 30°, 45°, and 60°. Moreover, with respect to each angle, three different types of lubricants were used which are Daphne Draw S Series, Palm Olein, and EFB bio oil. The Universal Testing Machine and Surface Roughness Tester were used in this experiment. The result obtained from the experiment shows that at 30° of taper die angle were producing the smooth product surfaces for each lubricant and Daphne Draw S Series could reduce the surface roughness compared to other lubricant test.
Link to publisher's homepage at http://www.ttp.net/
2014-01-01T00:00:00Z