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Permatang Kuching, Malaysia

Heng H.H.,University Tunku Abdul Rahman | Hii C.P.,No. 39
International Journal of Hydrology Science and Technology | Year: 2011

The objective of this review is to compare the PMP convention of SMHB/B&P vis-à-vis other consultants' studies that have been carried out in Malaysia. The review primarily addresses the issues on the PMP derivation in Peninsular Malaysia and with minimum coverage of PMP issues in the Borneo states of Sarawak and Sabah. The short- and long-duration PMP values were applied in Peninsular Malaysia and Borneo states. The PMPs adopted by SMHB/B&P are further classified into two series, i.e., coastal and inland. Fourteen reports and studies related to the derivation of PMP in Peninsular Malaysia by other consultants were discussed in detailed. Both PMP estimates adopted by SMHB/B&P and the studies by other consultants are presented systematically in tandem in this review. Copyright © 2012 Inderscience Enterprises Ltd. Source

Heng R.K.J.,University Putra Malaysia | Onichandran S.,No. 39 | Suhailiee K.A.M.,University Putra Malaysia | Sait M.,University Putra Malaysia | And 2 more authors.
Taiwan Journal of Forest Science | Year: 2014

The natural regeneration of forests is an important part of the recovery of former shifting-cultivation areas. Regenerating secondary forests are reported to have the potential to assimilate and store large quantities of carbon. However, there is a lack of information on biomass accumulation by pioneer species that dominate early successional processes, especially in tropical Asia. This information would help quantify their role in carbon storage and sequestration. The objectives of this study were to estimate the biomass accumulation and develop a biomass estimation model for a Dillenia suffruticosa stand. Six 10 × 10-m plots were established in a D. suffruticosa stand. A destructive harvesting method was used to estimate the total and tree component (stem, branches, and leaves) biomass values. An analysis showed that the biomass relationship for each tree component using diameter at breast height (dbh) as an independent variable in a log relationship accounted for 63∼89% of the variations at p ≤ 0.01. The estimated total aboveground biomass of the D. suffruticosa stand was 5.2 t ha-1. The high variability of the estimated total biomass in each study plot indicated that the stand was at different stages of succession, but the low biomass accumulation is a reflection of severely degraded conditions and may require a longer period for recovery. However, the natural regeneration of D. suffruticosa has contributed to biomass and carbon accumulation in a former shifting-cultivation area. Source

Heng H.H.,University Tunku Abdul Rahman | Hii C.P.,No. 39
International Journal of Hydrology Science and Technology | Year: 2011

The purpose of this investigation is to summarise the current standard of practices for estimating reservoir sediment inflows for the entire duration of their useful service life, normally 100-year ARI design period. To achieve this objective, a review of the past and contemporary literatures and conventions on sedimentation issues in Malaysia as well as other regional countries is imperative. A case study was carried out using the Teriang reservoir. Both the low and high (Type I and II, respectively) curves are adopted for predicting the suspended load concentration (mg/l) using normalised flow discharge per unit area (Q/km2; m3/s/km2). Alternative method by coupling the sediment rating and flow duration curve (both daily and monthly) are also used for checking purpose. The low (Type II) and high (Type I) curves yield 167 and 608 tonne/km2/year suspended sediment, respectively. Copyright © 2012 Inderscience Enterprises Ltd. Source

Meng W.,No. 39 | Zhang C.,No. 39 | Yan B.,No. 39 | Xu F.,No. 39
Drilling Fluid and Completion Fluid | Year: 2015

Individule water molecules can form complexed water through intramolecular and intermolecular networking by hydrogen bonds between HWLH, a complex agent, and water molecules. HWLH has the ability to stop water from migration between test fluid (containing HWLH) and formation, protecting reservoirs from being damaged. Laboratory studies show that HWLH test fluid has good rheology, inhibitive capacity, water block prevention capacity (air-liquid interfacial tensions are 25.7-25.9 mN/m), low corrosion and good gas-hydrate inhibition. HWLH test fluid is compatible with early stage work fluids, test fluids for non-reservoir sections and formation water. HWLH test fluid has been successfully used in testing of the gas well Lingshui 17-2-1. ©, 2015, North China Petroleum Administration Drilling Technology Research Institute. All right reserved. Source

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