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Articles by W.M.R. Idris
Total Records ( 2 ) for W.M.R. Idris
  Z.A. Rahman , J.Y.Y. Lee , S.A. Rahim , T. Lihan and W.M.R. Idris
  The demand for land in conjunction to infrastructure development is become crucial and expensive. In the near future, a problematic soil such as peat is becoming a final alternative. In crucial cases, peat land cannot be avoided and has been hosted for engineering structures (e.g., road, highway, railway and bridge). Peat soil is well established of its downgraded characteristics, highly compressibility and low in shear strength. This study aimed to investigate effect of fly ash and gypsum on the mechanical properties of peat soil. Fly Ash (FA) is a by-product material that is generated from the burning of coal in thermal power plants. In this study, gypsum was prepared chemically in the laboratory to simulate residue from Neutralization Underflow Process (NUF). For the first batch of samples, the peat samples were initially treated with Synthetic Gypsum (SG) in the ranges between 0 and 20% of sample dried weight (SG treated soil). In a second batch, the peat samples were prepared with 10% FA and then mixed thoroughly with different amounts of SG contents (0, 5, 10 and 20%) (10FA-SG treated soil). The results showed that soil treated with mixture of 10% FA and SG indicated lower liquid limit values than the SG treated soil. In compaction tests, the maximum dry density of both increased in both SG treated soil and FA-SG treated soil. The permeability of SG treated soil increased with the increases in SG contents. Similarly, occurred to permeability of FA-SG treated soil however, its values are lower than the soil treated without FA. Shear strength of SG treated showed decreased with increasing amount of SG content. In contrast, the FA-SG treated soil exhibited higher strength if compared to that of SG treated soil. The result suggested that the application of FA and SG mixture is more effective in stabilization in mechanical strength and densification of peat soil than the use of SG only.
  B.M. Md-Zain , N.A. Sha`ari , M. Mohd-Zaki , F. Ruslin , N.I. Idris , M.D. Kadderi and W.M.R. Idris
  Variation in socioecological characteristic such as activity pattern is an example of how primates adapted to their local environment. In this study, daily activity budget of long-tailed macaque (Macaca fascicularis) was described that confined in Universiti Kebangsaan Malaysia main campus. A comprehensive population survey of the long-tailed macaque was also conducted to determine the population count and group size. Between June 2002 and May 2010, several long-tailed macaque groups were observed via group focal sampling and the behavior continuously recorded. Population surveys indicated that there were nine groups of long-tailed macaques with 600 most individuals located around student residential colleges. Present results indicate that all long-tailed macaque groups spent most of their time in locomotion (18.00-31.36%). Resting (16.13-20.26%) and feeding (16.29-24.02%) accounted as the most activities after moving. However, long tailed-macaques were less engaged in social activities such as playing, vocalization, agonistic, grooming and sexual behaviors. Chi-square test demonstrated that daily activity budget differed significantly among behaviors.
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