September 2016 (Global Science and Technology Journal)

September 2016 (Global Science and Technology Journal)

Total Articles - 5

Pages 1 – 19

Author: Md. Mohibul Islam and Md. Mosharraf Hossain

In this paper a new approach is proposed to handle the uncertain input value in the aggregate production planning model.Generally aggregate production planning models have been developed by considering certain value of each parameter over a planning horizon. But in real life these values are not remain certain over a planning horizon rather uncertain.The main objective of this proposed appraoch is to find out the minimum total aggregate production planning cost considering uncertain input value. Hence, random value is considered from specific data range of each parameter of a specific automobile facory and finally compares the results with previous different approaches.

Pages 20 – 31

Author: Nahin Bahar Chowdhury, Mohammed Liaket Ali, Bikash Kumar Bhawmick and Md. Mahbubul Alam

Solar power is the flow of energy from the sun. It is one of the effective forms of renewable energy. The primary form of solar energy are heat and heat. Solar cells, referred to as photovoltaic cells, are devices or banks of devices that use the photovoltaic effect of semiconductors to produce electricity from sunlight. The solar tracking system is generally used in drastically changing environments in the tropical countries like Bangladesh. Due to this types of environment, solar panel doesn’t always get the absorbable maximum sunlight without any kind of automations system. It also reduces the power generation capacity of the solar panel. The purpose of this project is to automation of a parabolic solar tracker system which changes the angle of 36° in multi dimension and different time depending on sunlight by using sensors(LDR) to produce sufficient electricity and reduce the power crisis of our country.

Pages 32 – 42

Author: F. Alam and A. K. M. Akther Hossain

Frequency dependence initial permeability spectra of Mn0.20Zn0.50Cu0.30Fe2O4 synthesized by auto combustion method have been investigated. The X-ray diffraction patterns of this composition indicated that the sample possesses single phase cubic spinel structure. Sintering temperature (Ts) significantly affect on densification, grain growth and initial permeability of the samples. The grain size (D), bulk density ( B  ), initial permeability (μ/ i) increases with increase in sintering temperature. The average grain size varied from 53-97 μm.The initial permeability strongly depends on average grain size, density and intragranular porosity. The real part of initial permeability increases from 799 to ~1100. The ferrite sample with higher initial permeability has a relatively lower resonance frequency obeying the Snoek’s relation.

Pages 43 – 57

Author: Sayed Rezwanul Islam, Md. Masudur Rahman and Md. Sanwar-Ul-Quadir

Supplier selection is a multi-criteria problem which involves both qualitative and quantitative factors. It is a complex, multi-person and group decision making process that can be improved by systematic and logical approaches to assess priorities based on the inputs of several people from different functional areas within the company. In this research work, the authors have shown how fuzzy analytic hierarchy process (F-AHP) can be effectively used with failure mode and effects analysis (FMEA) approach for selecting the best supplier in risk’s environment. F-AHP is used to determine the relative weight of every criterion and FMEA is used to calculate the risk of every criterion and sub-criterion related to the supplier. Therefore, this research proposes a new failure mode and effects analysis (NFMEA) approach to select the best supplier from supply chain risk’s environment.

Pages 58 – 72

Author: Koninika Tanzim, Farhana Tarannum, Mohd Nur E Alam Siddique, M. Golam Mostafa, Fokir Rafiqul Alam and M. Zainal Abedin

The aim of the study was to find out the level of pollutants at the roof of a seven-storied building and the values were compared with ground level pollutants. The gaseous pollutants (SO2, NO2 and O3), particulate matter (2.5 and 10 micron) and lead in SPM were determined by UV-visible, AAS spectrophotometer and gravimetric methods respectively. For all the criteria pollutants, the concentration of pollutant was lower than ground level at Kallyanpur, Dhaka and also lowers than Bangladesh acceptable limit (DOE). High rise buildings are considered to be greener with lesser amounts of pollutant compared to ground level.

Total Articles- 5

All citation information on this page will be exported. help