Putra University, Malaysia

Putrajaya, selangor, Malaysia

Departments View all

Department of Chemistry
454
Total Impact Points
104
Members
Department of Civil Engineering
27
Total Impact Points
92
Members
Institute of Bioscience
361
Total Impact Points
80
Members

Publication History View all

  • [Show abstract] [Hide abstract]
    ABSTRACT: The sterilization process in the oil palm mill is a crucial step in extracting and yielding good quality oil. However, this process requires a vast amount of steam to be released to the atmosphere and with that, several attempts in replacing the current steaming sterilization process by means of dry(oven) heating, microwave heating and the invention of a continuous sterilizer were carried out by researchers to provide a greener technology for this purpose. This paper reviewed among the methods and past invention proposed and it can be concluded that the oil yield and the quality depend very much on two major factors, that is the pre-processing conditions and the sterilization and extraction methods used. Bunch strippability is enhanced through the use of continuous sterilizers of low temperature subjected to the fruits. Thorough comparison studies should be done on the current sterilization method and the new techniques introduced since both the current and new methods gave equally good benefits.
    Journal of Food Engineering 12/2014; 143:123–131.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Photovoltaic (PV) arrays consist of series and parallel connections of PV modules. Difference in current–voltage (I–V) characteristics among a batch of modules form an array causes power losses in PV systems referred to as mismatch losses. These power losses are conventionally reduced by module sorting techniques which sort modules based on an I–V parameter such as short circuit current, current at maximum power or maximum power. This work introduces a new method that employs genetic algorithm (GA) to find an arrangement of modules in an array which minimizes mismatch losses more effectively than conventional methods do. Extensive simulations are applied to adapt a GA to the problem of mismatch losses, find the arrangement and demonstrate its superiority over module sorting techniques in terms of mismatch losses decrement and energy yield increment. Instructions for practical application of the suggested method are also provided.
    Solar Energy 10/2014; 108:467–478.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Food security policy in Malaysia is largely about ensuring the availability, accessibility and utilization of rice to the society. To this end, three policy objectives were set since 1970s, namely: to ensure high price to paddy farmers to produce rice, to achieve a certain level of self-sufficiency in rice and to ensure a stable and high quality of rice to the consumers. To ensure these three-pronged objectives are met, the government has embarked on a protectionist regime to ensure the sector is insulated from the market vagaries particularly supply and price shocks. The instruments implemented include; price control (farm and retail), subsidies and income transfer, licensing and import monopoly. The interventions are deep and extensive in that the industry is highly distorted and begun to show some rigidities and inefficiencies. After the successful Green Revolution in the 1970s, paddy productivity has been slowing down in terms of annual rate of change. By 1990s, the chemical intensive culture introduced by the Green Revolution had started taking a toll. Evidences of reduction of soil fertility and water quality were rampant. While the other parts of the world are experiencing technological advances in paddy farming, Malaysia’s farmers remain conventional in their practices due to poor extension services. Hence, this study attempts to rectify these problematic and complex situation by proposing the need for more R&D (Research and Development) for higher yielding varieties, application of bio-fertilisers and new approach of extension (through farmer field schools). Towards these ends, the study has adopted the system dynamics methodology to capture the circular causality between variables in the paddy and rice system as well as delays and non-linearities. The findings suggest that gradual transition to bio-fertilizers, funding for R&D for development of high yielding hybrid rice and increasing the cropping intensity hold big promise towards productivity enhancement. The promotion of training and extension services using participatory approach of learning by doing or the farmer field schools is desirable to reduce the productivity gaps.
    Simulation Modelling Practice and Theory 09/2014; 47:152–164.

Information

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

 
International Journal of Psychological Studies. 11/2010;
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Qualitative Report 01/2005; 10(4):758-770.
308 Downloads

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