Evolution of Joint Roughness Degradation from Cyclic Loading and Its Effect on the Elastic Wave Velocity     

Mohd Mustaqim Mohd-Nordin  Ki-Il Song  Dongwook Kim  Ilhan Chang 《Rock Mechanics and Rock Engineering》2016,49(8):3363-3370

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Preliminary assessment of selected metals in agricultural soils in Jengka,Pahang, Malaysia     

Fazrul Razman Sulaiman  Noor Fitrina Sakilah Mustaffa  Siti Norhafiza Mohd Khazaai 《Environmental Earth Sciences》2016,75(3):223

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Characterization of active and closed landfill sites using 2D resistivity/IP imaging: case studies in Penang,Malaysia     

Abdullahi Abdulrahman  Mohd Nawawi  Rosli Saad  Asad Siraj Abu-Rizaiza  Mohd Suffian Yusoff  Amin Esmail Khalil  Kehinde Saheed Ishola 《Environmental Earth Sciences》2016,75(4):347

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Land transformation assessment using the integration of remote sensing and GIS techniques: a case study of Al-Anbar Province,Iraq     

Mohammed A. Jasim  Helmi Zulhaidi Mohd Shafri  Alireza Hamedianfar  Maher Ibrahim Sameen 《Arabian Journal of Geosciences》2016,9(15):667

Human activities and climate changes significantly affect our environment, altering hydrologic cycles. Several environmental, social, political, and economical factors contribute to land transformation as well as environmental changes. This study first identified the most critical factors that affect the environment in Al-Anbar city including population growth, urbanization expansion, bare land expansion, and reduction in vegetation cover. The combination of remote sensing data and fuzzy analytic hierarch process (Fuzzy AHP) enabled exploration of land transformations and environmental changes in the study area during 2001 to 2013 in terms of long and short-term changes. Results of land transformation showed that the major changes in water bodies increased radically (94 %) from the long-term change in 2001 to 2013 because of water policies. In addition, the urban class expanded in two short-term periods (2001–2007 and 2007–2013), representing net changes of 46 and 60 %, respectively. Finally, barren land showed 25 % reduction in the first period because of the huge expansion of water in the lake; a small percentage of growth gain was observed in the second period. Based on the land transformation results, the environmental degradation assessment showed that the study area generally had high level of environmental degradation. The degradation was mostly in the center and the north part of the study area. This study suggested for further studies to include other factors that also responsible for environmental degradation such as water quality and desertification threatening.  相似文献   

Prioritization of sub-watersheds for conservation measures in a semi arid watershed using remote sensing and GIS     

Mohd Yousuf Khanday  Akram Javed 《Journal of the Geological Society of India》2016,88(2):185-196

Land and water resources development plans are generally adopted at watershed level. Delineation of watersheds and their prioritization within large river basins requires host of terrain parameters to be studied and analysed. Chopan watershed in Central India has been studied for sub-watershed delineation and prioritization based on drainage morphometry, land use/land cover and sediment yield index analysis using remote sensing and GIS techniques. The watershed was demarcated into five sub-watersheds on the basis of drainage flow directions, contour value, slope, elevation. Geocoded satellite data of 1989 and 2001 on 1:50 000 scale were visually interpreted to prepare land use/land cover and drainage maps which were later digitized using Arcview/ArcGIS. Linear and shape aspects of the sub-watersheds were computed and used for prioritization. The results show widespread variation in drainage characteristics, land cover changes and sediment yield rates across sub-watersheds. On the basis of morphometric, land use/land cover change and sediment yield index, sub-watersheds were grouped into low, medium and high priority. A correlation of results show that SW1 and SW5 are common sub-watersheds falling under high and low priority based on morphometric, land use change analysis and SYI. The priority list of sub-watersheds will be crucial for decision making and implementation of land and water resource conservation projects.  相似文献   

The deuterium and oxygen-18 isotopic composition of the groundwater in Khan Younis City,southern Gaza Strip (Palestine)     

Mohd S. Abu Jabal  Ismail Abustan  Mohd Remy Rozaimy  Hussam El Najar 《Environmental Earth Sciences》2018,77(4):155

The environmental isotopes such as deuterium and oxygen-18 and the deuterium excess values have been used to assess groundwater recharge sources and their dynamics in Khan Younis City in the Gaza Strip in Palestine. Three isotopic lines for the relationship between δ²H and δ¹⁸O were used in the assessment. These lines are the global meteoric water line, the local meteoric water line and the groundwater evaporation line. The δ²H, δ¹⁸O and D-excess values indicate that deuterium and oxygen-18 isotopes originated in the groundwater from groundwater mixing with rainfall and other water sources; the groundwater in the area recharged from rainfall from a distant source that came from the Mediterranean Sea and from other sources such as wastewater, irrigation return flow and saline water.  相似文献   

Landsat data to evaluate urban expansion and determine land use/land cover changes in Penang Island,Malaysia   总被引：3，自引：1，他引：2  

Kok Chooi Tan  Hwee San Lim  Mohd Zubir MatJafri  Khiruddin Abdullah 《Environmental Earth Sciences》2010,60(7):1509-1521

Land surface temperature (LST) plays an important role in local, regional and global climate studies. LST controls the distribution of the budget for radiation heat between the atmosphere and the earth’s surface. Therefore, it is important to evaluate abrupt changes in land use/land cover (LULC). Penang Island, Malaysia has been experiencing a rapid and drastic change in urban expansion over the past two decades due to growth in industrial and residential areas. The aim of this study was to investigate and evaluate the impact of LST with respect to land use changes in Penang Island, Malaysia. Three supervised classification techniques known as maximum likelihood, minimum distance-to-mean and parallelepiped were applied to the images to extract thematic information from the acquired scene by using PCI Geomatica 10.1 image processing software. These remote sensing classification techniques help to examine land-use changes in Penang Island using multi-temporal Landsat data for the period of 1999–2007. Training sites were selected within each scene and seven land cover classes were assigned to each classifier. The relative performance of each technique was evaluated. The accuracy of each classification map was assessed using a reference data set consisting of a large number of samples collected per category. Two Landsat satellite images captured in 1999 and 2007 were chosen to classify the LULC types using the maximum likelihood classification method, determined from visible and near-infrared bands. The study revealed that the maximum likelihood classifier produced superior results and achieved a high degree of accuracy. The LST and normalised difference vegetation index (NDVI) were computed based on changes in LULC. The results showed that the urban (highly built-up) area increased dramatically, and grassland area increased moderately. Inversely, barren land decreased obviously, and forest area decreased moderately. While urban (minimally built-up) area decreased slightly. These changes in LULC caused at significant difference in LST between urban and rural areas. Strong correlation values were observed between LST and NDVI for all LULC classes. The remote sensing technique used in this study was found to be efficient; it reduced the time for the analysis of the urban expansion, and it was found to be a useful tool to evaluate the impact of urbanisation with LST.  相似文献   

Investigation of radio astronomical windows between 1 MHz and 2060 MHz in Universiti Malaya,Malaysia     

Zamri Zainal Abidin  Zainol Abidin Ibrahim  Syed Bahari Ramadzan Syed Adnan  Norwati Khairul Anuar 《New Astronomy》2009,14(6):579-583

An indoor and an outdoor radio frequency survey was conducted in Universiti Malaya, Malaysia, as a test site, for the purpose of developing radio astronomy research in Malaysia. This is the first radio astronomical survey of any such done in Malaysia. Observation and analysis were done in the radio frequency spectrum between 1 MHz and 2060 MHz. In this paper, the experimental setup and procedure of surveying are outlined and the measured data are interpreted. The eight radio astronomical windows were investigated from a 24 h observation, with the emphasis on two of the most important radio astronomical windows which are protected by the Malaysian Communications and Multimedia Commission (MCMC). Some intermittent observations were also done for referencing purposes. The radio frequency interferences (RFIs) are found to be relatively low. The overall relative Interference-to-Noise ratio (INR) at this test site ranges between 5.72% and 11.74%. The average strength of RFI in the eight focused radio astronomical windows at this site ranges between ?100 dBm and ?90 dBm (equivalently between 9.23 × 10⁴ Jy and 93.29 × 10⁴ Jy at resolution bandwidth of 125 kHz).  相似文献   

Observation of temperature and velocity in the coastal water off Kuala Terengganu,Malaysia     

Keisuke Taira  Mohd Nasir B. Saadon  Shoji Kitagawa  Tetsuo Yanagi 《Journal of Oceanography》1996,52(2):251-257

Mooring observation of current and temperature was made at 17.8 m layer of 19 m depth about 8 km east to Kuala Terengganu, Peninsular Malaysia. Harmonic analysis was applied to tidal currents for 30 days in September 1993, and to the tides observed at Chendering. The K1 tide was the largest both in tidal currents and the tides. Daily mean temperature, currents, sea level, and winds were analyzed from September 1993 to May 1994. Northeast Monsoon from December to February caused sea level rise of 50 cm and temperature lowering of 1°C.  相似文献   

Community structures of coral reefs around Peninsular Malaysia     

Tatsuki Toda  Tomoko Okashita  Takeshi Maekawa  Bin Abdul Adzis Kee Alfian  Mohd Kushairi Mohd Rajuddin  Ryota Nakajima  Wenxi Chen  Kunio T. Takahashi  Bin Haji Ross Othman  Makoto Terazaki 《Journal of Oceanography》2007,63(1):113-123

Coral community structures at eleven fringing reef sites were investigated along the coast of Peninsular Malaysia. Estimated coverage of coral communities is examined by applying quantitative digital image analysis to the line transect method. Four coral community types were characterized by dominant genera and lifeforms: Acropora branching community, Montipora-Acropora community, Porites massive community, and Heliopora community. Live coral coverage in all study sites ranged from 17.9% to 68.6%. Most reefs were in “fair” condition while some reefs were shown to be in “poor” condition. Coral community structures among the study sites were divided into the west coast of Peninsular Malaysia with a dominant Porites massive lifeform, and the east coast with a variety of lifeform categories of Montipora and Acropora. Physical effects such as the monsoon wind regime and sedimentation are likely to influence the formation of dominant coral communities around Peninsular Malaysia.  相似文献