GEOLOGICAL MAPPING OF SABAH, MALAYSIA, USING AIRBORNE GRAVITY SURVEY

1Ahmad Fauzi Nordin, 1Hassan Jamil, 1Mohd Noor Isa, 1Azhari Mohamed
2Sanudin Hj. Tahir, 2Baba Musta,
3Rene Forsberg, 3Arne Olesen, 3Emil Nielsen
4Abd Majid A Kadir, 4Ahmad Fahmi Abd Majid
5Kamaludin Talib, 5Saiful Aman Sulaiman
1Jabatan Ukur dan Pemetaan Malaysia, Jalan Semarak, 50578 Kuala Lumpur
2Faculty of Science and Natural Resources,Universiti Malaysia Sabah, 88400
Kota Kinabalu,Sabah
3National Space Institute, Denmark Technical University, Copenhagen, Denmark
4Info-Geomatik, 81300 Skudai, Johor
5Faculty of Architecture, Planning and Surveying, Universiti Teknologi MARA
40450 Shah Alam, Selangor

ABSTRACT. Airborne gravimetry is an effective tool for mapping local gravity fields using a combination of airborne sensors, aircraft and positioning systems. It is suitable for gravity surveys over difficult terrains and areas mixed with land and ocean. This paper describes the geological mapping of Sabah using airborne gravity surveys. Airborne gravity data over land areas of Sabah has been combined with the marine airborne gravity data to provide a seamless land-to-sea gravity field coverage in order to produce the geological mapping. Free-air and Bouguer anomaly maps (density 2.67 g/cm3) have been derived from the airborne data both as simple ad-hoc plots (at aircraft altitude), and as final plots from the downward continued airborne data, processed as part of the geoids determination. Data are gridded at 0.025 degree spacing which is about 2.7 km and the data resolution of the filtered airborne gravity data were 5-6 km. The airborne gravity survey database for land and marine areas has been compiled using ArcGIS geodatabase format in order to produce the update geological map of Sabah.

KEYWORDS. Airborne gravimetry, gravity field, ArcGIS, geological mapping,

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ATOMISTIC SCALE STUDY OF LOCAL HEATING INTO SILICON:NANOINDENTATION USING MOLECULAR DYNAMICS SIMULATION

ABSTRACT.This paper presentsthe atomistic scale study of the effects of local heating during nanoindentation into Silicon (Si). Nanoindentation techniques and experiments with fundamental principles of MD simulations were at first introduced.The indentation processesof indentation depths an order of magnitude much smaller than experimental values and over indentation times several orders of magnitude shorter. The effects of local heating were studied using Force-Depths (F-D) curves and snapshots. The influences of the indentation speeds and temperature on the deformative behaviour of Silicon (Si) were also discussed. The force-depth curves signified the temperature influence on silicon during retraction for thermalized speeds, implying that the topology of the silicon surface did not change after tip retraction. Snapshots of the simulations into Si showed that slower indentation speeds would exhibit a decrease in the number of heated atoms.

KEYWORDS.Nanoindentation, indentation depths, indentation speeds, thermalized,simulations.

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