Volume 2, Issue 8, 2021
1. Numerical Investigation for the Improving the Aerodynamic Characteristics of the Darrius VAWT
This study aims to improve the performance of the three Darrius blades VAWT. The improvement is carried out using the three-dimensional numerical simulation for the hybrid VAWT (Darrius -Icewind) with two different configurations (models) named (Hyb.3D3Ic125 and Hyb.3D2Ic125). The numerical investigation was carried out with wind velocity of 10 m/sec, shear stress transport (SST) k-ω turbulent model, and finite volume method (FVM). The main predicted results from this simulation are the static pressure and velocity distributions contours, coefficient of drag, and static torque, from these results, it is found that for the Hyb.3D3Ic125 model the maximum drag coefficient is 2.348 at angular positions of 120°, while the minimum drag coefficient is 1.527 at angular positions of 0°, also the starting torque is 0.05301 N.m, the predicted results show agreement with those reported in the literature for VAWT with different blade designs.
Keywords: VAWT; H-Darrius; Hybrid Darrius-Icewind; CFD; FVM.
2. Optimization of Bleaching Parameters of Palm Oil Using Major Porta Adsorbent
Optimization of the bleaching process of red oil using acid activated Major Porta adsorbent (M1) was presented in this study. Through a series of batch experiments, several samples of palm oil were bleached at various temperatures, times, and adsorbent dosage using M1 and Fuller’s earth, a commercial bleaching agent (CBE). The optical absorbance of the oil samples (raw and bleached) were measured at 450nm wavelength with UV Spectrophotometer and petroleum ether was used as reference. Bleaching performances of M1 and CBE were calculated and physico-chemical properties of raw and bleached oil were determined using standard methods for the purpose of comparison. Bleaching performance of M1 was found to compare well with that of CBE under optimum conditions. The optimum condition for the bleaching process was found to be: contact time (10 minutes), temperature (1000C) and adsorbent to oil ratio (1g: 30g). At optimum conditions M1 and CBE had bleaching performance (BP) of 90.466% and 95.673% respectively. Physico-chemical properties of the M1—bleached oil showed considerable improvement compared with the properties of the raw oil. Thus, activated Major Porta clay is a viable source of adsorbent for the bleaching of palm oil.
Key Words: Adsorbent, adsorptive bleaching, optimization, Red oil.
3. Financial Soundness Prediction of State Owned Commercial Banks of Bangladesh: An Application of Bankometer Model
Financial soundness creates an image for any business and it helps the stakeholders to assess the performance of that business. However, recently banking sectors of Bangladesh is facing the worst condition in its history. For the few months banks are suffering from liquidity crisis. The purpose of the study is to examine the financial soundness of State Owned Commercial Banks of Bangladesh with the application of Bankometer model. This study used only secondary data. The main source of data is audited Financial Reports. The study reveals that the State Owned Commercial Banks of Bangladesh have consistently maintained the financial soundness as its solvency score is found higher than the limit of 70% over the period of 2013-2019. Moreover, State Owned Commercial Banks of Bangladesh have fulfilled the individual parameter requirement of Bankometer model throughout the period except cost to income ratio and NPL ratio. Practically, this research can be used as a reference for banking industry to use Bankometer model in predicting and analyzing bankruptcy level of the banks, so that the banks can avoid insolvency issues. The study is a pioneering attempt to apply Bankometer model on State Owned Commercial Banks operating in Bangladesh.
Key Words: Financial Soundness, Prediction, State Owned Commercial Banks, and Bankometer Model.
4. Graph of Fuzzy Topographic Topological Mapping and its Classification
Fuzzy Topographic Topological Mapping (FTTM) is a novel mathematical model to determine the location of epileptic foci in epilepsy disorder patient. This model is composed into three mathematical algorithms using topological and fuzzy structures of recorded magnetic fields produced by electrical activity in the brain of people who suffer from epilepsy disorder. In this paper we establish further new structure of FTTM; i.e. Graph of FTTM and subsequently, we present a classification of FTTM graph depend on some definitions and facts in the field of graph theory.
Keywords: Fuzzy topographic topological mapping; Graph theory.