NOPR Collection:

Biosorption of Zn (II) from aqueous solution by jatropha curcas press cake

Sat, 01 Mar 2014 00:00:00 GMT

Title: Biosorption of Zn (II) from aqueous solution by jatropha curcas press cake Authors: Abidin, Zurina Z.; Salleh, Mohd M. A.; Harun, M. Y.; Bakar, Abu N. Abstract: Biosorption of Zn (II) from aqueous solution using Jatropha curcas press cake was comparatively investigated over a range of variables (contact time, pH, and initial metal concentration) by batch adsorption experiments. Highest Zn (II) removal (~40 mg/L) was attained using 0.5g adsorbent for 100 minutes with initial Zn (II) concentration of 50 mg/L and pH 4. The adsorption data was best fitted with Langmuir isotherm (R² = 0.99) and follows second order kinetic rate equation (R²> 0.99). FTIR analysis revealed the availability of phenol, alcohol and carboxyl functional groups in Jatropha curcas press cake for the biosorption. XRD results confirmed the presence of Zn (II) in the press cake after adsorption process. These findings concluded that Jatropha curcas press cake is a suitable biosorbent for removing Zn (II) in heavy metal polluted wastewater. Page(s): 191-194

Experimental reduction of NO_x and HC emissions in a CI engine fuelled with methyl ester of neem oil using p-phenylenediamine antioxidant

Sat, 01 Mar 2014 00:00:00 GMT

Title: Experimental reduction of NO_x and HC emissions in a CI engine fuelled with methyl ester of neem oil using p-phenylenediamine antioxidant Authors: Balaji, G.; Cheralathan, M. Abstract: Biodiesel, a renewable substitute to conventional diesel and offers cleaner combustion including reduced particulate matter, carbon monoxide and unburned hydrocarbon emissions. However, several studies point to increase in NO_x emissions for biodiesel fuel compared with conventional diesel fuel. In this paper, the experimental investigation of the effect of antioxidant additive (p-phenylenediamine) on NO_x and HC emissions in a methyl ester of neem oil fuelled direct injection diesel engine has been reported. The antioxidant additive is mixed in various concentrations (0.010 to 0.040 % (w/w)) with methyl ester of neem oil and was tested in computerized 4-stroke water-cooled single cylinder diesel engine of 3.5 kW rated power. Results show that the antioxidant additive is effective in controlling the NO_xand HC emissions of methyl ester of neem oil fuelled diesel engines. Page(s): 177-180

Potentials of Elaeis guineensis and Pinus sylvestris as binders on foundry core strength

Sat, 01 Mar 2014 00:00:00 GMT

Title: Potentials of Elaeis guineensis and Pinus sylvestris as binders on foundry core strength Authors: Fayomi, O. S. I.; Abdulwahab, M.; Popoola, A. P. I. Abstract: The potential of foundry sand core binders made with palm oil (Elaeis guineensis) and pine oil (Pinus sylvestris) were investigated. Core specimens made with Ota silica base sand bonded with percentage of cassava starch in admixed proportion of Elaeis guineensis and Pinus sylvestris were tested for tensile, compressive strength, permeability and time of collapse to establish the binder’s efficiency. Tensile strength of the green baked core were oven baked at 50°C, 100°C 150°C and 200°C; cooled to room temperature and tested with universal strength machine. The combined evaluation of the oils at higher percentages of starch addition indicates a significant improvement on the foundry properties. The cylindrically shaped permeability specimens were tested with permeability meter. Study revealed that cores baked at 150°C for palm oil attained a significant strength at lower baking periods than others. Pine oil showed an improve properties at 6% cassava starch at 200°C. Page(s): 173-176

Low Order Harmonic Reduction of Three Phase Multilevel Inverter

Sat, 01 Mar 2014 00:00:00 GMT

Title: Low Order Harmonic Reduction of Three Phase Multilevel Inverter Authors: Maheswari, A.; Gnanambal, I. Abstract: In this paper, a cascaded H-Bridge multilevel inverter has been proposed using unequal dc power sources and less number of switches. A standard cascaded multilevel inverter requires h number of dc sources for (2h + 1) levels. This proposed scheme allows less number of unequal DC power sources without the requirement of transformers. Cascaded H-Bridge multilevel inverter fed induction motor shows the better performance due to fundamental frequency switching scheme. High quality output is derived due to the absence of lower order harmonics. High conversion efficiency is also achieved for induction motor drive when it is operated with the proposed inverter. The performance of three phase cascaded H-Bridge multilevel inverter with unequal dc sources is simulated by using MATLAB platform. Harmonic analysis is done on cascaded H-Bridge seven level inverter and experimental results are presented to demonstrate the superiority of the proposed system. Page(s): 168-172

NOPR Collection:

Biosorption of Zn (II) from aqueous solution by jatropha curcas press cake

Experimental reduction of NOx and HC emissions in a CI engine fuelled with methyl ester of neem oil using p-phenylenediamine antioxidant

Potentials of Elaeis guineensis and Pinus sylvestris as binders on foundry core strength

Low Order Harmonic Reduction of Three Phase Multilevel Inverter

Experimental reduction of NO_x and HC emissions in a CI engine fuelled with methyl ester of neem oil using p-phenylenediamine antioxidant