Muhammad Iqbal Ahmad

Three Dimensional Simulation of Thermal Pad Using Nanomaterial, Nanosilver in Semiconductor and Electronic Component Application

Thermal pad is new technology in this world that been used in PLCC in order to reduce junction temperature to the minimum level in electronic components. In electronic industry, the electronic components that exceed 70°C will malfunction and damage due to the overheated. The design is used nanosilver as main material in thermo pad because it has high value of thermal conductivity and enables to dissipate heat very efficiently. The simulation of thermal pad in semiconductor is using FLUENTTM software. The results from simulation is been compared to the results from experiment. The differences between those results are less than 10%. The advantages of thermal pad are enables to reduce junction temperature of PLCC 20-30%. It also had constant thickness in order to get constant and accurate results.

Potential of Fabricated Light Foamed Concrete in Reducing Radon from Building Material

Three of Light Foamed Concrete (LFC) have been obtain by using different formula of Cement:Aggregates. The brick was locate into a closed Perspex box and the net of 222Rn concentration level have been measured for 5 consecutive days. The results show the LFC 3 has produced the lowest of net 222Rn concentration level in air, followed by LFC 2 and LFC 1, respectively. The result also show the 222Rn concentration level have been influenced by the temperature and relative humidity in air.

Experimental of wood gasification in suction biomass gasifier

Biomass is one of the alternatives energy which are abundant, relatively cheap, and widespread availability. This paper is aim to show the process finding according experimental work of wood using suction biomass gasifier. Energy can be extracted from biomass through gasification process. The experiment focuses on woody gasification. A suction biomass gasifier has been built and operated under stable condition which fueled from wood waste and air as gasifying agent. The biomass feeding rate was varied from 3 to 5.5kg/hr. Result show that producer gas contains CO in 20-30% in volume and H2 found to be varying between 14 and16% vol. The low heating value (LHV) from this woody gasification around 4-5 MJ/Nm3. Carbon conversion efficiency also measured as a parameter to indicate biomass-gas conversion.

Larvicidal Effectiveness of Azolla pinnata against Aedes aegypti (Diptera: Culicidae) with Its Effects on Larval Morphology and Visualization of Behavioural Response

Dengue is vector-borne diseases with 390 million infections per year extending over 120 countries of the world. Aedes aegypti (L.) (Diptera: Culicidae) is a primary vector for dengue viral infections for humans. Current focus on application of natural product against mosquito vectors has been the main priority for research due to its eco-safety. The extensive use of chemical insecticides has led to severe health problems, environmental pollution, toxic hazards to human and nontarget species, and development of insecticide resistance on mosquitoes. Azolla pinnata is an aquatic fern and predominantly used as feed in poultry industry and as fertilizer in agricultural field for enhancing the fertility of rice paddy soil. The present study was conducted to explore the larvicidal efficacy of A. pinnata using fresh and powdered form against late third-stage larvae (6 days, 5 mm in larvae body length) of Ae. aegypti (L.) (Diptera: Culicidae). The larvicidal bioassays were performed using World Health Organization standard larval susceptibility test method for different concentration for powdered and fresh A. pinnata. Powdered A. pinnata concentration used during larvicidal bioassay ranges from 500ppm to 2000ppm; meanwhile, fresh A. pinnata ranges from 500ppm to 9,000,000 ppm. The highest mortality was at 1853 ppm for powdered A. pinnata compared with fresh A. pinnata at 2,521,535 ppm, while the LC50 for both powdered and fresh A. pinnata recorded at 1262 ppm and 1853 ppm, respectively. Finally, the analysis of variance (ANOVA) showed significant difference on Ae. aegypti larval mortality (F=30.439, df=1, p≤0.001) and concentration (F=20.002, df=1, p≤0.001) compared to powdered and fresh A. pinnata at 24-hour bioassay test. In conclusion, the powdered A. pinnata serves as a good larvicidal agent against Ae. aegypti (L.) (Diptera: Culicidae) and this study provided information on the lethal concentration that may have potential for a more eco-friendly Aedes mosquito control program.

Variant analysis in coarse grain heat affected zone of low carbon steel

Coarse Grain Heat Affected Zone (CGHAZ) is a part of Heat Affected Zone (HAZ) that affected by heat during welding process. Application of different heat input dramatically varies CGHAZ microstructures without a noticeable changing in prior austenite grain size. The unique coarse microstructure and crack initiated at CGHAZ show there were possibility changes in crystallographic structure which may relate to the variant selection phenomenon. The aims of this study are to find the effects of heat input to the variant selection especially to the biggest grain at CGHAZ, hence correlate to the toughness and properties of the welded steel. The results show that heat input affected the variant selection at the biggest CGHAZ grain of low carbon steel. As heat input increase, grain area was increased and becomes coarser. Variant selection phenomenon present at low carbon steel due to the increase in grain diameter and high angle value. It was found that variant selections had occurred during the transformation.

Waste Banana Peel and its Potentialization in Agricultural Applications: Morphology Overview

The reserach is focused on the resistance of bio-polymer thin film to bio-degradation in compost soil from renewable resources based on waste banana peel and waste egg shell in polymer matrix. The combination of waste banana peel and waste egg shell in producing of bio-mulching film is a new inovation in agricultural industry . Bio-mulching film is a biodegradable plastics films that can help in increasing the moisture content of soil and improving the soil ingredients in order to make the plants grow well. The thin film is produced by using the waste banana banana peelas the reinforcement fiber, eggshell as filler and epoxy resin as matrix. The thickness of thin film was in between 0.10 mm to 0.15 mm. The epoxy/waste banana banana peelwith eggshell (EWE) 10%, were affected by bio-degradation in soi burial test where the occurances of surface damages, which in turn enhances the degradation of physical properties.