A5060422517- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Tropical and Extratropical Cyclones Research
- Climate variability and models
- Meteorological Phenomena and Simulations
- Solar Radiation and Photovoltaics
- Remote Sensing in Agriculture
- Ocean Waves and Remote Sensing
- Mechanical Circulatory Support Devices
- Remote-Sensing Image Classification
- Central Venous Catheters and Hemodialysis
- Wind and Air Flow Studies
- Remote Sensing and LiDAR Applications
- Earthquake Detection and Analysis
- Water Quality Monitoring Technologies
- Water Quality Monitoring and Analysis
- Wind Energy Research and Development
- Geological and Geophysical Studies
- Flood Risk Assessment and Management
- Atmospheric and Environmental Gas Dynamics
- Air Quality and Health Impacts
- Hemodynamic Monitoring and Therapy
- Marine and coastal ecosystems
- Air Quality Monitoring and Forecasting
Affiliated Hospital of Southwest Medical University
2025
Universiti Sains Malaysia
2011-2018
RCSI & UCD Malaysia Campus
2017
Bentham Science Publishers (United Arab Emirates)
2013
Bentham Science Publishers (China)
2013
Hospital Universiti Sains Malaysia
2012
Universiti Sains Islam Malaysia
2011
Abstract. Over the past 24 years, AErosol RObotic NETwork (AERONET) program has provided highly accurate remote-sensing characterization of aerosol optical and physical properties for an increasingly extensive geographic distribution including all continents many oceanic island coastal sites. The measurements retrievals from AERONET global network have addressed satellite model validation needs very well, but there been challenges in making comparisons to similar parameters situ surface...
Central vascular access devices (CVADs) have become an important focus for safe practice in some patients. The aim of this study was to develop a reliable and valid knowledge questionnaire blood sampling via CVADs registered nurses by using both classical test theory (CTT) Rasch analysis. A cross-sectional conducted, the completed 445 participants. CTT analysis were used measure psychometric properties questionnaire. final consisted 23 items. revealed acceptable internal reliability with...
Aerosols are among the most interesting topics investigated by researchers because of their complicated characteristics and poor quantification. Moreover, significant uncertainties associated with changes in Earth's radiation budget. Previous studies have shown numerous difficulties challenges quantifying aerosol influences. In addition, heterogeneity from loading properties, including spatial, temporal, size, composition features, presents a challenge. this study, we over two regions...
Abstract. Obtaining continuous aerosol-optical-depth (AOD) measurements is a difficult task due to the cloud-cover problem. With main motivation of overcoming this problem, an AOD-predicting model proposed. In study, optical properties aerosols in Penang, Malaysia were analyzed for four monsoonal seasons (northeast monsoon, pre-monsoon, southwest and post-monsoon) based on data from AErosol RObotic NETwork (AERONET) February 2012 November 2013. The aerosol distribution patterns Penang each...
Aerosol optical depth (AOD) is the measure of aerosols distributed within a column air from instrument or Earth's surface to top atmosphere. In this paper, we compared AOD measured by Raymetrics Lidar system and AERONET sunphotometer. A total 6 days data which was collected both instruments were compiled compared. Generally, value calculated are higher than that data. Differences similarities in trend observed corresponding explanations done. Level 1.5 estimated have an accuracy ±0.03, thus...
Remotely sensed data has proved to be an effective source of information for monitoring changes in land use and cover. However, remotely images are often degraded due atmospheric effects or physical limitations. Atmospheric correction reduces the influences that mixed with pure signal target making it difficult extract accurate about scene target. In this study, 4 techniques: namely ATCOR 2, 3, FLASSH empirical line method were used correct Landsat 5 TM Penang Island, Malaysia. The accuracy...
Abstract. The AErosol RObotic NETwork (AERONET) program over the past 24 years has provided highly accurate remote sensing characterization of aerosol optical and physical properties for an increasingly extensive geographic distribution that includes all continents many island sites. measurements retrievals from AERONET global network have addressed satellite model validation needs very well, but there been challenges in making comparisons to similar parameters situ surface airborne...
The problem of difficulty in obtaining cloud-free scene at the Equatorial region from satellite platforms can be overcome by using airborne imagery. Airborne digital imagery has proved to an effective tool for land cover studies. camera imageries were selected this present study because image provides higher spatial resolution data mapping a small area. main objective is classify RGB bands taken low-altitude Cropcam UAV cover/use over USM campus, penang Island, Malaysia. A conventional was...
A backscattering lidar at 355 nm wavelength with Raman channel produced by Raymetrics was operated in Universiti Sains Malaysia (USM) Penang Island. This is currently taking measurements of the vertical distribution clouds and aerosol layers over Background subtraction such as solar radiation for range corrected signal during day time needed. Dead-time correction then applied to improve signal. In order obtain better near far range, gluing both analog photon counting (PC) necessary. Temporal...
A long-term (1984–2013) aerosol index observation derived from Total Ozone Mapping Spectrometer (TOMS) and Monitoring Instrument (OMI) as well meteorological parameters are analyzed focusing on Nigeria. The results show that, the pattern of distribution variability (dust concentration) is not uniform over Rather depends strongly significantly latitude season both temporally spatially. overall mean 30-years has shown high values in northern Nigeria compared to south, with spatially...
Atmospheric aerosol is a major health-impairment issue in Malaysia especially during southeast monsoon period (June-September) due to the active open burning activities. However, hazy days were an Penang, March, 2014. Haze intruded Penang March and lasted for month except few after rain. Rain water had washed out aerosols from atmosphere. Therefore, this study intends analyse profile optical properties of haze event Meanwhile, several (during April, 2014) also analyzed comparison purposes....
Lidar is a widely used instrument by scientists around the world because of its high temporal and spatial resolution. With these characteristics, interpretation lower atmosphere behavior improved, especially for structure boundary layer, strongly related to air quality in region. For first time backscattering lidar with wavelength 355 nm Raman capabilities produced Raymetrics was operated Universiti Sains Malaysia (USM) Penang Island. Due operational constraints, this study will only discuss...
The study of tail-end effects typhoon on orography is new to Malaysia. current used FY-2D satellite data investigate the variation selected parameters Typhoon Ketsana system. In situ data, obtained via radiosonde technique, were verify atmospheric conditions, whereas Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Model was applied determine structure mountains in East Malaysia (EM). This aimed identify typhoon-terrain effects, terms wind, cloud, rain...
Remote sensing techniques have been used to study the impacts of tropical cyclone. In order figure out relationship typhoon with orography effect, precipitation products are acquired from Feng Yun 2D; and Global Digital Elevation Model (GDEM) ASTER satellite was applied as well. After combining both elevation Peninsular Malaysia (PM), rainfall distribution patterns distinctly affected by mountains range. Titiwangsa Mountain range is major mountain which able influence movement raining...
Ozone (O <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> ) is a radiatively active trace gas that plies important role in atmosphere heating rates because of its good ability to absorb the infrared radiation and occur both at ground level naturally earth's upper atmosphere. Results from analysis retrieved monthly (AIRX3STM) 1°×1° spatial resolution Atmosphere sounder (AIRS) data were utilized analyze distribution O column burden...
Air pollution index (API) is an commonly used in Malaysia to determine the air quality level. It a ground truth data measurement which unable unambiguously quantify level at higher atmosphere. On other hand, aerosol optical depth (AOD) from AERONET obtained using sun photometer provides reading of for column atmosphere surface. We first quantitative correlation between API and AOD collected Penang, Malaysia, January – September, 2012, two independent methods, one based on regression analysis...
Aerosol optical depth (AOD) from AERONET data has a very fine resolution but air pollution index (API), visibility and relative humidity the ground truth measurements are coarse. To obtain local AOD in atmosphere, relationship between these three parameters was determined using multiple regression analysis. The of southwest monsoon period (August to September, 2012) taken Penang, Malaysia, used establish quantitative which is modeled as function API, humidity, visibility. highest correlated...
For the need to exploit and optimize use of all available sources energy in providing power supply for industrial economic development rural communities. Nigerian government has initiated some programs 2005 look into potentialities wind as a means generation. In order complement this effort, surface synoptic speed observation data (2008-2013) from NOAA-NCDC Nigeria was used analyze characteristics katsina (13.007’ N; 07.661’ E; Altitude 05060.0 m; Air density 1.18 kg/m3). A modified form an...
Abstract. In this study, the optical properties of aerosols in Penang, Malaysia were analyzed for four monsoonal seasons (northeast monsoon, pre-monsoon, southwest and post-monsoon) based on data from AErosol RObotic NETwork (AERONET) February 2012 to November 2013. The aerosol distribution patterns Penang each period quantitatively identified according scattering plots depth (AOD) against Angstrom exponent. A modified algorithm prototype model Tan et al. (2014a) was proposed predict AOD...
We investigate the effect of orography on relationship wind-cloud systems with tropical cyclones (TC). The impact is important for cloud distribution and wind flow patterns TC activity. Furthermore, influence TCs remains unclear an active area scientific research because complexity effects caused by presence mountains. focus typhoons in open sea, near coastal regions, atmospheric circulation level between troposphere stratosphere (TS level) varies when disturbances, such as a high mountain...
The objective of this study is to investigate the effects orography on rainfall, wind, and cloud systems TCs in Malaysia Indochina. To determine relationship typhoon with orographic effect, remote sensing techniques such as Global Digital Elevation Model (GDEM) from Advanced Spaceborne Thermal Emission Reflection Radiometer (ASTER) satellite, rainfall data Fengyun 2D (FY-2D), radiosonde were applied study. From study, following conclusions can be drawn: 1) tends distributed over high...
East Malaysia has few mountains ranges which are believed to affect the cloud and rainfall distribution patterns during severe weather especially typhoon season. The study objectives investigate determine relationship between impacts topography of Malaysia. highest mountain range in was Crocker Range Sabah, divides state into half. Mountain tend follow north-south or northeast-southwest paths, rising over 4095.2 meters houses by Mount Kinabalu, country, as well Trusmadi (2642m) Tambuyukon...
Environmental monitoring through the method of traditional ship sampling is time consuming and requires a high survey cost. This study uses an empirical model, based on actual water quality total suspended solids (TSS) measurements from Penang Island, Malaysia to predict TSS values optical properties Oceansat satellite digital imagery. The proposed algorithm reflectance model that function inherent water, which can be related its constituent's concentrations. Water samples were collected...