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141.
The subtidal sediments of four coastal environments (beach, berm, surf zone and nearshore sea floor) of Kuala Terengganu have
been studied in terms of their textural characteristics and depositional process. Sampling and statistical analyses of the
grain size distributions of beach, surf zone and shallow sea-floor sediments at various locations along the coastline show
that they varied in their mean grain size as well as values of sorting and skewness. The statistical parameters of grain size
distributions thus allowed recognition of distinct sub-environments. The size distribution of such sediments suggests that
the various processes that are responsible for their transportation and deposition are wave, current and wind action. The
different energy conditions and the morphology of each coastal environment seem to be reflected in the characteristics of
the sediments in each environment. 相似文献
142.
Samayamutthirian Palaniandy Khairun Azizi Mohd AzizliHashim Hussin Syed Fuad Saiyid Hashim 《International Journal of Mineral Processing》2007
Silica was ground in an oscillating mill at various grinding period to study the mechanochemical effect in fine grinding process. The ground particles exhibited massive size reduction where the volume moment diameter of 5.56 μm was reached within 600 s. Aggregation of fine particles was very pronounced when it was ground for 600 s due to high surface energy. Aggregation of fine particles caused the ground particles to exhibit poly-modal particle size distribution. Line broadening and reduction of diffractogram peak intensity were observed. Amorphization rate up to 16.9% was exhibited by the particle ground for 600 s. Preferential breakage of plane was observed where (101) and (111) was easily distorted compared to (110) and (200). Rapid reduction of crystallite size was observed at early stage of grinding until it reached a plateau at 5 nm at 600 s whilst the change in lattice strain was 0.5%. 相似文献
143.
Onuoha Iheanyichukwu Joachim Norhaya Kamarudin Godwin Uche Aliagha Miswan Abdul Hakim Mohammed Hishmuddin Mohd Ali 《Geographical review》2017,107(3):496-515
The aim of this study is to identify the predictive factors and variables that motivate decisions to supply sustainable or green commercial properties, and to apply discriminant analysis technique to assess if there are significant differences in perception between real estate developers in Malaysia and Nigeria based on the identified variables. The result revealed a significant discriminant function differentiating the two countries based on their perception of the variables. The motivational components and attributes were found to be in favor of Malaysia. The Wilks' lambda F‐test and the standardized discriminant function coefficients, showed that there were significant differences between developers in both countries as assessed by the life‐cycle cost motivations, green policies and certification, market strategy, developers expected rate of return, green tax incentive, and available green skills. However, the variables with the most predictive power in accounting for the differences were found to be within the measures of life‐cycle, cost‐saving motivations. 相似文献
144.
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146.
Khalid A. Al-Ghanim Zubair Ahmad Hmoud F. Al-Kahem Al-Balawi Fahad Al-Misned Shahid Maboob El-Amin M. Suliman 《中国海洋湖沼学报》2016,34(1):109-117
Specimens of Clarias gariepinus were treated with lethal (70, 75, 80, 85, 90, and 95 mg/L) and sub-lethal concentrations (8, 12 and 16 mg/L) of uranyl acetate, a low-radiotoxicity uranium salt. The LC 50 value was registered as 81.45 mg/L. The protein and glycogen concentrations in liver and muscles were decreased in the fish exposed to sub-lethal concentrations. The red blood cell (RBC) and white blood cell (WBC) counts, haemoglobin (Hb) concentration and haematocrit (Hct) values were decreased. Different blood indices like mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH) and mean corpuscular haemoglobin concentration (MCHC) were negatively affected. Level of plasma glucose was elevated whereas protein was decreased. The level of calcium concentration (Ca) was declined in the blood of exposed fish whereas magnesium (Mg) remains unchanged. The activity level of glutamic-oxaloacetic transaminase (GOT) and glutamic-pyruvic transaminase (GPT) was elevated in exposed fish. These effects were more pronounced in the last period of exposure and in higher concentrations. Results of the present study indicate that uranyl acetate has adverse effects on Clarias gariepinus and causes changes in the biochemical and hematological parameters of the fish. 相似文献
147.
Land use/land cover change is a global phenomenon which reflects natural resources degradation and/or utilization. Remote sensing and GIS have been widely used to monitor such changes at watershed level. The present study evaluates the LU/LC change during 1989 - 2001 in a semi-arid watershed of central India. Geocoded satellite data of 1989 and 2001 on 1:50,000 scale, were visually interpreted to prepare thematic maps which were later digitized using ArcGIS softwares. The analysis shows that vast tracts of cultivated land have become uncultivated and at some places even converted to wasteland. However, the land under dense forest and open forest has decreased due to expansion of built-up land and other anthropogenic activities. Increase in area of uncultivated land, wasteland and decrease in cultivated land and open scrub is also supported by rainfall analysis, which shows a declining trend and a fall of 186.93 mm in average annual rainfall for 1986-2003 period. The change detection map prepared using land use/land cover of 1989 and 2001 as inputs shows that out of the total geographical area of the watershed, 25.78% of the watershed area has seen a change from one land use category to another, however rest 74.22% has remained unchanged. 相似文献
148.
Utilization of bituminous limestone ash from EL-LAJJUN area for engineering applications 总被引:1,自引:1,他引:0
The following work aims at minimizing the environmental impact of the solid wastes (ash) that is produced after the utilization
of the bituminous limestone in thermal power stations and /or retort processes. Limy ash has been prepared from the El-Lajjun
bituminous limestone by direct combustion at 1,200, 950, and 525°C respectively. The laboratory tests have been selected with
respect to construction needs and possible post construction conditions. Utilization of the various types of ash in the stabilization
problematic soils from Jordan as brown soils and the clayey marl has revealed optimum results. The unconfined compressive
strength of the parent brown soil and the clayey marl has been raised from 5 kg/cm2 to 50 and 25 kg/cm2, respectively. The CBR value has been raised from 4.5 to 150% for both problematic soil types. Various mortars and construction
elements can be produced at normal room curing temperature without the use of ordinary Portland cement (OPC). Low quality
sub-base and base course can be mixed with ash to produce cement treated base (CTB) and roller compacted concrete (RCC) without
OPC. Durable pavements, embankments can be constructed with very long life and low cost. CTB and RCC utilizing ash can be
used in dam construction instead of normal soil in earth fill dams. The high alkalinity of El-Lajjun ash is considered as
a disadvantage to be utilized in normal concrete mixes for structural purposes. Ash only can be mixed with aggregates to produce
lean concrete like for blinding purposes to be prepared for foundation activities. 相似文献
149.
150.
Past fisheries development policies in Malaysia are assessed and new grounds for managing the Malaysian fisheries are explored. Some incompatibility in the goals for fishery development are discerned, especially those of increasing domestic landings through mechanization and resource conservation. Future management efforts should be based on a fuller understanding of the fishery stock and regional management of fish stocks. Aquaculture is often seen as a plausible alternative in order to augment supplies from the capture fisheries. A comprehensive multidisciplinary approach is needed to transform and commercialize traditional, experience-dependent culture systems into technology-packaged systems based on scientific methods. There is also substantial potential for the development of recreational fisheries. 相似文献