Environmental management activities of an infrastructure development project: the case of Beris Dam, Malaysia

Development projects need to integrate environmental dimensions into project management functions to ensure successful implementation of environmental management and control practices throughout the development process. The management functions include the scope of work for environmental control, the quality of work or performance to be delivered, the scheduling for environmental works, and the most important one is the budget for environmental control. The aim of this paper is to examine and discuss about the environmental dimensions of Beris Dam during its construction and development process. The environmental dimension criteria and elements of the project were examined by means of reviewing environmental control documents used in the project’s construction and development, and site visits. The review reveals that in general the Beris Dam EIA and EMP reports scored between ‘unsatisfactory’ to ‘good’ for the criteria and elements of good environmental practice. These findings indicate the need to increase both effort and implementation of environmental dimensions in project management to help improve the success of implementing environmental management activities in the construction and development of a projec

Influence Of Elicitor Availability On Limonene And Linalool Accumulation From Citrus Grandis Cell Cultures.

Limonene and linalool are among the active terpenes and major constituent of citrus essential oils. Limonene, the principal component of orange peel oil, has been identified as a non toxic agent with potential for cancer chemotherapy (Hardcastle et al. 1999)

Profile of Parkia speciosa hassk metabolites extracted with SFE using FTIR- PCA method

A rapid identification, classification and discrimination tool, using Fourier Transform Infrared (FTIR) spectroscopy combined with Principal Component Analysis (PCA), was developed and applied to determine the profile of the Supercritical Fluid Extraction (SFE) of Parkia speciosa seeds under various temperature and pressure conditions (313, 323, 333, 343, 353 and 363 K and 20.68, 27.58, 34.47, 41.37, 48.26, and 55.16MPa). The separation and identification of the compounds was carried out by Gas Chromatography coupled with Time of Flight Mass Spectrometry (GC/TOF-MS). This technique has made it possible to detect the variability obtained under different SFE conditions and the separation of different chemical compounds in P. speciosa seeds. The FTIR-PCA results were verified by GC/TOF-MS, and the FTIR-PCA method successfully identified the unsaturated carboxylic acids with the highest percentage area under the different conditions

One- and Two-Dimensional Hydrological Modelling and Their Uncertainties

Earth processes, which occur in land, air and ocean in different environment and at different scales, are very complex. Flooding is also a part of the complex processes, which need to be assessed accurately to know the accurate spatial and temporal changes of flooding and their causes. Hydrological modelling has been used by several researchers in river and floodplain modelling for flood analysis. In this chapter, factors affecting flash flood, possible options of basic input parameters in one- and two-dimensional hydrological models in data sparse environment, some case studies and uncertainty in hydrological modelling were discussed. This discussion will help the readers to understand the flooding factors, selection of input parameters in data sparse environment, a brief insight of one- and two-dimensional hydrological models and uncertainties in their input and model parameters and model structures

Simultaneous extraction and fractionation of fish oil from tuna by-product using supercritical carbon dioxide (SC-CO2)

Fish oil was extracted and simultaneously collected into six fractions based on molecular weight and the chain length of triglycerides in terms of fatty acid constituents without splitting of the triglycerides, using supercritical carbon dioxide (SC-CO2) at optimized conditions of 40 MPa, 65°C, and a flow rate 3 mL min−1. In each type of fractionation, the first fraction (F1) was rich in saturated fatty acids (SFA; 52.57 to 61.26%), followed by monounsaturated fatty acids (MUFA; 22.17 to 23.22%) and polyunsaturated fatty acids (PUFA; (0.54 to 20.37%); the sixth fraction (F6) was rich in PUFA (48.93%), followed by MUFA (33.59%) and SFA (13.61%). It was obvious that short-chain fatty acids were extracted at an earlier fraction; therefore, the latter fractions were dominant in long-chain fatty acids, especially MUFA and PUFA. Thus, omega-3 fish oil (last three fractions) was successfully separated to be used as a value-added health product

Optimization of arecoline extraction from areca nut using supercritical carbon dioxide.

The mass transfer of arecoline using supercritical carbon dioxide (SC-CO2) from areca nut is studied by analyzing the diffusion coefficient derived from Crank equation for sphere model. Comparisons of the SC-CO2 extracted yield under various conditions showed that the combination of pressure at 10.3 MPa and temperature of 50°C provided the optimum condition for extraction, followed by extraction at 40°C and 25.6 MPa. From the diffusion coefficient analysis, the optimum conditions also gave the highest coefficients. It was found that the yield is directly proportional to the values of the coefficients. Key words: areca nut, arecoline, supercritical carbon dioxide, mass transfer, modelin

Physicochemical properties of cocoa butter replacers from supercritical carbon dioxide extracted mango seed fat and palm oil mid-fraction blends

Supercritical carbon dioxide (scCO2) extracted mango seed fat (MSF) was blended with palm oil mid-fraction (POMF) to obtain cocoa butter replacers (CBRs). The fatty acid constituents and physicochemical properties of the formulated blends were analysed by gas chromatography (GC). In this study, the fatty acid constituents and other physicochemical properties such as iodine value (43.2 to 43.4 g I2/100 g fat), saponification value (195.7 to 195.9 mg KOH/g fat), acid value (2.1 to 2.7%), and slip melting point (33.8 to 34.9°C) of blends MSF/POMF at ratios 85/15, 80/20, 75/25, and 70/30 were found similar to the physicochemical properties of commercial cocoa butter. Thus, it could be concluded that the MSF/POMF blends that are blends 85/15, 80/20, 75/25, and 70/30 (3 to 6) could be suggested as CBRs in terms of the physicochemical properties like fatty acid constituents, iodine, saponification and acid values and slip melting point

Cocoa butter fats and possibilities of substitution in food products concerning cocoa varieties, alternative sources, extraction methods, composition, and characteristics

The current concern for cocoa butter fat as major ingredients of chocolate intake in the World has raised the question of the high price of cocoa butter among all other vegetable fats. Productions of natural cocoa butter fats are decreasing day by day due to the decrease of cocoa cultivation worldwide; moreover, cocoa fruit contains only a little amount of cocoa butter. Therefore, the food industries are keen to find the alternatives to cocoa butter fat and this issue has been contemplated among food manufacturers. This review offers an update of scientific research conducted in relation to the alternative fats of cocoa butter from natural sources. The findings highlights how these cocoa butter alternatives are being produced either by blending, modifying the natural oils or fats from palm oil, palm kernel oil, mango seed kernel fats, kokum butter fat, sal fat, shea butter, and illipé fat

Spatial estimation of average daily precipitation using multiple linear regression by using topographic and wind speed variables in tropical climate

Complex topography and wind characteristics play important roles in rising air masses and in daily spatial distribution of the precipitations in complex region. As a result, its spatial discontinuity and behaviour in complex areas can affect the spatial distribution of precipitation. In this work, a two-fold concept was used to consider both spatial discontinuity and topographic and wind speed in average daily spatial precipitation estimation using Inverse Distance Weighting (IDW) and Multiple Linear Regression (MLR) in tropical climates. First, wet and dry days were identified by the two methods. Then the two models based on MLR (Model 1 and Model 2) were applied on wet days to estimate the precipitation using selected predictor variables. The models were applied for month wise, season wise and year wise daily averages separately during the study period. The study reveals that, Model 1 has been found to be the best in terms of categorical statistics, R2 values, bias and special distribution patterns. However, it was found that sets of different predictor variables dominates in different months, seasons and years. Furthermore, necessities of other data for further enhancement of the results were suggested

Supercritical enhancement for separation of lauric acid and oleic acid in palm kernel oil (PKO)

The extraction of dehulled ground palm kernel using supercritical carbon dioxide (SC-CO2) as a solvent at a temperature of 80 ◦C and pressures ranging from 27.6 to 48.3 MPa was studied for 30–60 min. At 27.6, 34.5, 41.4 and 48.3 MPa the sample was extracted for 60, 40, 30 and 30 min, respectively, and the total oil achieved 37.5, 38.35, 41.0 and 44.75%, respectively. Within 30 min extraction at 27.6 MPa about 28.2% of oil was extracted and with increasing pressure, the extraction rate concurrently enhanced to 33.7, 41.0 and 44.75% at 34.5, 41.4, and 48.3 MPa, respectively. At 80 ◦C the solubility of the oil increased from about 4.01 to 14.11 g/100 g carbon dioxide as the pressure was increased from 27.6 to 48.3 MPa, however, maintaining constant temperature of 80 ◦C the solubility of oil increased with pressure. The extracted yield collected as about 1 g of oil in each fraction. The fatty acid composition of oil extracted varied with fractionation of the sample. Caprylic acid (C8), capric acid (C10), lauric acid (C12) and myristic acid (C14) were found to be decreased from the first to the last fraction (8th fraction). On the other hand there was an increase in palmitic (C16), stearic (C18:0), oleic (C18:1) and linoleic (C18:2) acids from first to the last fraction