Measuring a Level of Water Pollution in Sungai Pinang Using a Mathematical Model

Mathematical models are now a popular tool in many applications such as physics, economics and engineering; and provide useful information for decision making and planning. Water pollution in Malaysia has reached a level that needs attention and intervention from environmental department and government. In order to make a strong case, this paper has done a study on measuring the pollution level of Sungai Pinang which is located in Penang Island, Malaysia. Advection-Dispersion equation is one of the mathematical models that often use in evaluating the level of water pollution in the river. This paper applies this model and compares the result of this study with the studies done in the previous research worldwide to evaluate the severity of the pollution. The authors hope that this paper will create awareness to relevant department and also to community in genera

Study of Dissimilar Welding AA6061 Aluminium Alloy and AZ31B Magnesium Alloy with ER5356 Filler Using Friction Stir Welding

This paper is to study of dissimilar welding AA6061 aluminium alloy and AZ31B magnesium alloy with ER5356 filler using friction stir welding. 2 mm thick plates of aluminium and magnesium were used. Friction stir welding operations were performed at different rotation and travel speeds and used the fixed tilt angle which is 3°. The rotation speeds varied from 800 to 1100 rpm, and the travel speed varied from 80 to 100 mm/min. In the range rotation speed of 800 to 1000 rpm and welding speed of 80 to 100 mm/min there are no defect at the weld. Tensile test show the higher tensile strength is 198 MPa and the welding efficiency is about 76%

Possibilità di sviluppo della coltivazione del sorgo per l'alimentazione del bestiame in Somalia

In 1979, a trial concerning yield differences between 2 different periods of harvesting (soft dough and complete maturation of the grain) of a sorghum hybrid BR has been carried out in Afgoy (Somalia). The effects of four nitrogen level have been also evaluated. The results show no effect of different nitrogen levels on total dry matter production and grain quality. Maximum dry matter yield and maximum F.U. production has been reached at complete maturation of the grain. General level of grain yield has been restricted in consequence of bird damage in spite of the presence of the gene BR

Simulating urban growth in the George town conurbation

Simulation of land use changes has been discussed at length, with increasing papers proposing new methods to predict urban growth. Simulating urban growth can provide a clearer view of urban expansion which gave huge impact in developing a city. This phenomenon, however, also has driven the encroachment into agricultural and forest land in order to cater urban growth expansion. Therefore, this paper aims to develop an urban growth simulation model using GIS-based CA-Markov approach, incorporated with driving forces of urban growth in the Malaysian context. Land use data based on year 2006, 2010 and 2014 of the study area were prepared in a GIS database and used to develop and validate a CA-Markov Model using Idrisi Kilimanjaro software. The findings indicated new or expanded built-up areas of 2018 are found to be located in close proximity to existing growth centers and settlements.Keywords: CA-Markov; Geograpghic Information Sciences (GIS); Land use changes;Urbanization

Laboratory Investigation on the Behaviour of Improved Organic Soil of Khulna Region

The conventional foundation systems are not suitable for the massive structures in Khulna region i.e. South-west part of Bangladesh because an organic soil layer exists at a depth 10ft to 25ft from the existing ground surface. The existence of organic soil layer in the deposits results excessive settlement due to its high compressibility and low shear strength. To overcome the problem, soil improvement techniques are usually adopted depending upon the type of constructions. It is necessary to know the degree of improvement for the different improved grounds prior to the selection of ground improvement techniques. So a laboratory investigation was conducted to find out the effect of improvement techniques on reconstituted organic soil to obtain a guideline for selection, design and construction of suitable soil improvement method for this region. The laboratory investigation reveals that the compacted sand bed improves bearing capacity of organic ground significantly

Design of microstrip patch antenna with LTCC substrate for K-Band application: article / Nurdiyana M. Mahamud

This thesis presented the design model and simulation of 2x1 microstrip patch antenna with multilayer LTCC substrate. The antenna was design and simulation for K-band application for the range from 18GHz to 27GHz. Design of this antenna consists a circular microstrip patch antenna array with multilayer LTCC substrate in order to minimize the size of antenna and increase the gain and bandwidth for antenna performance. The specification for the proposed array antenna is it has a frequency of 22GHz, Ferro A6S LTCC substrate, an epsilon 5.9, a substrate thickness of 0.096mm and copper thickness of 0.01mm. LTCC Ferro A6S was chosen as substrate compares to other because it has high relative permittivity and multilayer structure which result in a compact size antenna. This design was simulated using Computer Simulation Tool Microwave Environment Software. The performance of the antenna was evaluated in terms of bandwidth, gain, directivity, return loss, and Voltage Standing Ratio (VSWR)

Dividend Versus Capital Gain and Investor Preference:A Case Study on Dhaka Stock Exchange

This paper explores investors’ preference for capital gain and dividend payment. The questionnaire results show that overall, investors prefer capital gain over cash dividend. The results from the regression also demonstrate that all demographic variables and investor characteristic, specifically education level, age, investment amount and investment income, are positively related to an investors tendency to prefer dividend payment, with investment income and age having the strongest impact. The results from this test reconfirm that investors with larger sums tend to be more risk averse. Moreover, the results from the primary data also reveal that investor preferences are compatible and consistent with traditional theories including the Birds-in-the-Hand Theory, Information Signaling Theory, Tax Preference Theory and Clientele Effect Theory. Keywords: dividend payment, capital gain, demographic characteristics, Information Signaling Theory

Design of microstrip patch antenna with LTCC substrate for K-Band application / Nurdiyana M. Mahamud

This thesis presented the design model and simulation of 2x1 microstrip patch antenna with multilayer LTCC substrate. The antenna was design and simulation for K-band application for the range from 18GHz to 27GHz. Design of this antenna consists a circular microstrip patch antenna array with multilayer LTCC substrate in order to minimize the size of antenna and increase the gain and bandwidth for antenna performance. The specification for the proposed array antenna is it has a frequency of 22GHz, Ferro A6S LTCC substrate, an epsilon 5.9, a substrate thickness of 0.096mm and copper thickness of 0.01mm. LTCC Ferro A6S was chosen as substrate compares to other because it has high relative permittivity and multilayer structure which result in a compact size antenna. This design was simulated using Computer Simulation Tool Microwave Environment Software. The performance of the antenna was evaluated in terms of bandwidth, gain, directivity, return loss, and Voltage Standing Ratio (VSWR)