Oil spill modeling of diesel and gasoline with GNOME around Rajaee Port of Bandar Abbas, Iran

Rajaee port in Bandar Abbas is one of the important-oil transport hubs in Persian Gulf and any oil spill incidents can result in pollution, which impact on human habitats and the marine environment. Oil spill trajectory modeling is a tool which applied to increase the knowledge about oil spill fate. The GNOME model is a physical model which indicates the oil spill movements on sea water and potential risk areas. The model inputs include GIS data, time of spill release, release duration, spill chemistry and physical characteristics of wind and current data. Two scenarios for 10 and 200 bbl of diesel and gasoline spills are run on the model. Both the general Persian Gulf circulation which is from the south west and the local wind direction cause to move the oil spills toward the Bandar Abbas coast and Qeshm Island that pollutant these areas. Both regions are very valuable economic and environmental zones. They have known as risk places due to the oil spills that release from Rajaee Port in this study. The model results can assist organizations in preparing their emergency management systems for responses in the potential risk areas

Multi-criteria decision analysis integrated with GIS for radio astronomical observatory site selection in peninsular of Malaysia

No AbstractKeywords: site selection; radio astronomical observatory; multi-criteria decision  analysis; geographical information system; Peninsular of Malaysi

Radio Astronomy Research in Malaysia: past, present and future

This paper will report on the progress in the research field of radio astronomy in Malaysia and also in South-East Asia. Radio astronomy research can be said to have only started being done actively in Malaysia in 2005. Fundamental setup and some basic research were done in the early parts. Jupiter radio bursts as well as radio meteor counting were the first few projects. Currently a medium-sized radio telescope which was recently purchased is being used to undergo more advanced research such as observing spectrum of galaxy clusters in order to study Dark Matter. This paper will also report on the latest results on the survey of Radio Frequency Interference (RFI), which is currently done on chosen candidate sites in Malaysia in order to setup on it a large radio telescope in the future. The best site with the lowest averaged REI level is found at Langkawi (-100.33 dBm or 4.4 x 10(6) Jy). The author is the chair for the Radio Astronomy Working Group for the South-East Asia Astronomy Network (SEAAN) and the Malaysian team is very much an important part of this group. This group will eventually be a research hub for the global projects of the Global-Very Long Baseline Interferometer (Global-VLBI) and the Square Kilometre Array (SKA)

The nonlinear least square fitting for rotation curve of orion dwarf spiral

The basis of the nonlinear least square fitting is to fit the nonlinear rotation curve model with the observed rotation curve of the Orion dwarf galaxy. It has been the most powerful tool to study the distribution of dark matter in galaxies where it is used to obtain the proper mass model of a galaxy. In this paper, we present the rotation curve fit of Orion dwarf galaxy, corrected for asymmetric drift by using the gradient method of nonlinear least square. Our results showed an excellent agreement between the mass models of cored halo profile with the observed rotation curve. Thus, we can estimate the value of disk mass, MD; the core radius, r0 and core density, ro of the galaxy with 1-s of uncertainty. We finally indicated the dark matter halo distribution as cored dark matter halo with density, 3.9 × 106MŸ kpc-3

Neap-spring tidal effects on dissolved oxygen in two Malaysian estuaries

The longitudinal distributions of dissolved oxygen change dramatically during neap-spring tidal cycles in the lower Selangor and Klang Rivers. An oxygen deficit develops in both estuaries when the tidal range is high. The Selangor River inflow is nearly saturated with D.O., but during spring tides D.O. falls to as little as 15% of saturation in the middle reaches of the estuary. The Klang River has low D.O. freshwater input, an oxygen minimum develops during neap tides, and anoxic conditions are produced by spring tides. These oxygen minima are attributed to the high oxygen demand of sediment that rests on the bottom during neap tides and is resuspended during spring tides. The ecological effects of tidal cycling patterns of dissolved oxygen in these Malaysian estuaries need further study, within the context of land use patterns and other human activities

Kennicutt-Schmidt Law in the Central Region of NGC 4321 as Seen by ALMA

We present the Atacama Large Millimeter/Sub-millimeter Array (ALMA) cycle-0 science verification data of the CO(1-0) line emission in the central region of NGC 4321 (also known as M100) at the distance of 17.1 Mpc and VLA, L-band data of HI of the same galaxy. We have drawn the center area of M100 in the 12CO(J = 1-0) line with the resolution of (3.87″ × 2.53″) as viewed by ALMA, along with HI and Spitzer 8 and 3.6 μm data. The relationship between the surface density of molecular gas mass ΣH2 and that of star formation rate ΣSFR has been investigated, in addition to the relationship between the surface density of the neutral atomic hydrogen mass and that of ΣSFR (Kennicutt-Schmidt law) in this galaxy with a high spatial resolution. The results indicate that a significant correlation exists between the SFR surface density and the molecular gas mass density in the ∼2 kpc region. The power-law index has been determined for three regions: center, upper and lower arms. The value of this index in the center region is 1.13, which follows the traditional (K-S) law and indicates that the molecular gas is affected by star formation

The First Radio Astronomical Observation of Jupiter Radio Bursts in Malaysia

In this research note, the first radio astronomical observation of the Jupiter in Malaysia is presented. In Malaysia and in terms of foregrounds, radio observation is an excellent alternative to optical observation to detect extra-terrestrial objects. Clouds and rains do not effect sky's radio measurements. However, the main obstacle is the Radio Frequency Interferences (RFI), especially man-made. Thus careful choice of observing sites is important. The work in this paper shows results of observations at University of Malaya, which is deemed to be a sufficient, but by far not the best site for Jupiter tracking in Malaysia. A Yagi antenna is used for RFIs measurements and a dipole antenna is used for transit tracking of radio Jupiter. Two detections of radio Jupiter bursts and one solar radio burst detection are reported

Indication of radio frequency interference (RFI) sources for solar burst monitoring in Malaysia

Apart of monitoring the Sun project, the Radio Frequency Interference (RFI) surveying in the region of (1-1200) MHz has been conducted. The main objective of this surveying is to test and qualify the potential of monitoring a continuous radio emission of Solar in Malaysia. This work is also an initiative of International Space Weather Initiative (ISWI) project where Malaysia is one of the country that participate a e-Callisto Spectrometer network in order to study the behavior of Solar radio burst in frequency of (45-800) MHz region which will be install in this October. Detail results will indicate the potential of monitoring a solar in Malaysia

Star Formation Law at Sub-kpc Scale in the Elliptical Galaxy Centaurus A as Seen by ALMA

We present an extensive analysis of the relationship between star formation rate surface density () and molecular gas surface density () at sub-kpc scale in the elliptical galaxy Centaurus A (also known as NGC 5128) at the distance 3.8 Mpc. 12CO ( = 2-1) data from Atacama Large Millimetre/Sub-Millimetre Array SV data with very high resolution (2.9′′, 0.84′′), as well as 24 μm data from the Spitzer Space Telescope, were used. This is one of the first studies of the SF law on Centaurus A at this very high spatial resolution. The results showed a breakdown in star formation law with a index relating and at 185 pc. A significant correlation exists between surface densities of molecular gas and SFR with very long depletion time (68 Gy). In addition we examined the spatially resolved relationship between velocity dispersion and star formation rate surface density for the outer disk of this galaxy and we found that the average velocity dispersion is equal to 11.78 km/s. The velocity dispersion of the molecular ISM for the outer disk is found to follow a power relation with the star formation rate surface density , where β is the slope from the ordinary least square fitting. The value of β is about and is the power law index of the star formation law

Combined Investigations of Solar Bursts Type III and V

This review intended to update the results of combination two burst, type III and V in one solar flare event. Magnetic reconnection of both burst will be explained theoretically. Both bursts are found on 19th September 2011 associated with C-class flares on active region 1295. We concentrate on the mechanism of evolution the bursts which play a role in the event. It is found that type V burst appeared with five second after type III. There are a few sunspot regions on the solar disk but most are magnetically simple and have remained rather quiet. An interpretation of this new result depends critically on the number of sunspot and the role of active region 1295. Sunspot number is increases up to 144 with seven sunspots can be observed. During that event, the speed of solar wind exceeds 433.8 km/second with 2.0 g/cm3 density of proton in solar corona. Currently, radio flux is also high up to 150 sfu. Solar flare type C6 is continuously been observed in x-ray region for 24 hours since 1541 UT and a maximum C1 is detected on 1847 UT. Although the sources of both bursts are same, the direction and ejection explode differently. It is believed that the ejection of particles in type III burst is more compare type V. In summary, the behavior of type III should be critically understood in order to predict the formation of type V burst