Putra University, Malaysia

Putrajaya, selangor, Malaysia

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Department of Chemistry
418
Total Impact Points
85
Members
Road Safety Research Centre (RSRC)
8
Total Impact Points
74
Members
Department of Civil Engineering
23
Total Impact Points
69
Members

Publication History View all

  • [Show abstract] [Hide abstract]
    ABSTRACT: The present work was conducted to investigate the effect of purification and conjugation processes on functional properties of durian seed gum (DSG) used for stabilization of water in oil in water (W/O/W) emulsion. Whey protein isolate (WPI) was conjugated to durian seed gum through the covalent linkage. In order to prepare WPI-DSG conjugate, covalent linkage of whey protein isolate to durian seed gum was obtained by Maillard reaction induced by heating at 60°C and 80% (±1%) relative humidity. SDS-polyacrylamide gel electrophoresis was used to test the formation of the covalent linkage between whey protein isolate and durian seed gum after conjugation process. In this study, W/O/W stabilized by WPI-conjugated DSG A showed the highest interface activity and lowest creaming layer among all prepared emulsions. This indicated that the partial conjugation of WPI to DSG significantly improved its functional characteristics in W/O/W emulsion. The addition of WPI-conjugated DSG to W/O/W emulsion increased the viscosity more than non-conjugated durian seed gum (or control). This might be due to possible increment of the molecular weight after linking the protein fraction to the structure of durian seed gum through the conjugation process.
    Colloids and surfaces B: Biointerfaces 09/2014; 113C:107-114.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Conventional fuzzy logic controller is applicable when there are only two fuzzy inputs with usually one output. Complexity increases when there are more than one inputs and outputs making the system unrealizable. The ordinal structure model of fuzzy reasoning has an advantage of managing high-dimensional problem with multiple input and output variables ensuring the interpretability of the rule set. This is achieved by giving an associated weight to each rule in the defuzzification process. In this work, a methodology to design an ordinal fuzzy logic controller with application for obstacle avoidance of Khepera mobile robot is presented. The implementation will show that ordinal structure fuzzy is easier to design with highly interpretable rules compared to conventional fuzzy controller. In order to achieve high accuracy, a specially tailored Genetic Algorithm (GA) approach for reinforcement learning has been proposed to optimize the ordinal structure fuzzy controller. Simulation results demonstrated improved obstacle avoidance performance in comparison with conventional fuzzy controllers. Comparison of direct and incremental GA for optimization of the controller is also presented.
    Applied Soft Computing 03/2014; 11(2):1631–1637.
  • Source
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    ABSTRACT: Silver nanoparticles in chitosan medium were prepared by the chemical reduction method. Silver nitrateand hydrazine were used as the precursor and reducing agent in the present of chitosan as a naturalhost polymer. The samples are characterized by UV–visible spectroscopy, X-ray diffraction (XRD) andtransmission electron microscopy (TEM). The measurements of nonlinear optical properties were definedby Z-scan technique using green CW laser beam operated at 532 nm wavelengths. Thermal effect has adominant role in the overall material nonlinearity with CW laser. It is shown that the synthesized sampleshave a negative nonlinear refractive index.
    Optik - International Journal for Light and Electron Optics 02/2014; 125(9).

Information

  • Address
    43400, Putrajaya, selangor, Malaysia
  • Website
    www.upm.edu.my
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Top publications last week by downloads

 
International Journal of Business and Management. 01/2009;
225 Downloads
 
Global Journal of Health Science. 01/2010;
203 Downloads

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