Stochastic Generation Of Hourly Wind Speed Time Series.

In the present study hourly wind speed data of Kuala Terengganu in Peninsular Malaysia are simulated by using transition matrix approach of Markovian process. The wind speed time series is divided into various states based on certain criteria

Autoregressive Integrated Moving Average Model(Arima)For Forecasting Wind Speed.

For proper planning and efficient utilization of wind energy, wind speed predictions are important. In the present study the hourly wind speed data from 1995 to 2001 at three meteorological stations at a height of 14 m above the ground level have been analysed for fitting autoregressive integrated moving average (ARIMA) models

Radon levels of water sources in the southwest coastal region of peninsular Malaysia

Across populations, the dominating source of public exposure to radiation is radon gas. In the present study, we aimed at determining the concentration of radon in water sources from the southwest coastal region of Peninsular Malaysia. A total of 27 water samples were taken from various water sources which included groundwater, as well as hot spring, lake, river, seawater, and tap water; the radon concentrations were measured using a RAD7 portable radon detector. The radon concentrations ranged from 0.07 ± 0.12 to 187 ± 12 Bq l−1, with an average of 21 ± 12 Bq l−1. The highest concentration was found in hot spring water, with an average concentration of 99 ± 6 Bq l−1, while the lowest concentration was found in tap water, with an average concentration of 1.95 ± 0.61 Bq l−1. The average concentrations of radon for all categories of sampled water were below the 100 Bq l−1 WHO guidance level for safe drinking water. According to the ICRP effective dose conversion factor and UNSCEAR (2000), the total effective dose from the summation of inhaled and imbibed water was calculated from the aqueous radon concentrations, with an average effective dose of 4.45 µSv y−1, well within the WHO safe drinking water guideline value of 100 µSv per year. The results of this study could support the efforts of authorities and regulators who are responsible for controlling and strategizing to ensure public safety against radon exposures

Evolusi Projek Konservasi Tapir Malaya

Kertas ini mengupas sejarah penubuhan projek daripada tahun 2002 sehingga kini yang meliputi tim projek, aspek penyelidikan yang dijalankan serta sumbangan penerbitan. Kertas ini menyenaraikan cabaran projek di masa hadapan

The enhanced naturally occurring radioactivity of negative ion clothing and attendant risk

The study investigates commercially available negative ion clothing, and evaluations are made using gamma-ray spectroscopy and Geant4 Monte Carlo simulations. Observed to contain naturally occurring radioactive material (NORM), evaluations are made of the radiological risk arising from the use of these as items of everyday wear, undergarments in particular. Organ doses from these were simulated using the MIRD5 mathematical female phantom, with the incorporation of dose conversion factors (DCFs). At 175 ± 26, 1732 ± 247, and 207 ± 38 Bq, for238U,232Th, and40K respectively, item code S05 was found to possess the greatest activity, while item code S07 was shown to have the least activity, at 2 ± 0.5 and 15 ± 2 Bq, and again for238U and232Th, respectively. Sample code S11 recorded least activity, at 29 ± 5 Bq, for40K. Among the clothing items, sample item code S05 offered the greatest concentrations of Th, U and Zr, with percentage means of 1.23 ± 0.1, 0.045 ± 0.001, and 1.29 ± 0.1, respectively, giving rise to an annual effective dose of 1.57 mSv/y assuming a nominal wearing period of 24 h per day. Accordingly, the annual public dose limit of 1 mSv can be exceeded by their use

Political connections, corporate governance, and tax aggressiveness in Malaysia

Purpose: The purpose of this paper is to examine the relationship between political connections and corporate tax aggressiveness in Malaysia. In addition, this paper investigates the relationship between corporate governance variables and corporate tax aggressiveness. Next, the study investigates the mitigating role of corporate governance in the relationship between political connections and corporate tax aggressiveness. Design/methodology/approach: The sample of this study is based on 2,538 firm-year observations during the 2000-2009 periods. This study employs a panel least square regression with both period and industry fixed effects. The study retrieved the corporate governance variables from the downloaded annual reports, whilst the remaining data were collected from Compustat Global. Findings: This study finds that politically connected firms are more tax aggressive than non-connected firms. Furthermore, the study finds that large board size decreases the likelihood of tax aggressiveness and a non-linear relationship exists between institutional ownership and tax aggressiveness suggesting increase in monitoring as the ownership increases. However, the study finds no evidence to suggest that corporate governance mitigates the influence of political connections in promoting tax aggressiveness behavior. The findings suggest that the impact of political connections could outweigh the benefits of changes in corporate governance in Malaysia. Research limitations/implications: The data are not recent, but it reflects a rather longitudinal research period. Originality/value: This paper extends the literature of tax research in Malaysia which is in its’ infancy stage. Furthermore, it investigates the role of political connections in tax-planning research