Magnetite (Fe3O4) nanoparticles were synthesized by sol-gel method using ferric nitrate and ethylene glycol as precursors at 250ºC and 300ºC. X-ray diffraction (XRD) study was used to determine the particle size and structural properties. The microstructural and particle size analysis were carried out using scanning electron microscope (SEM). Magnetite (Fe3O4) nanoparticles were annealed at 250ºC obtained as smaller crystal size than that of 300ºC. Fourier Transform Infrared (FTIR) spectroscopy was used to identify the functional groups of active compound in synthesized magnetite nanoparticles and their corresponding bands were observed in the region between 500cm-1 and 4000cm-1 of infrared radiation. The observed peaks at wave number 574cm-1 and 424cm-1 due to the vibration of tetrahedral and octahedral sites which is indicative the formation of spinel structure of magnetite (Fe3O4). Removal of Cr was found 80% by the synthesized magnetite (Fe3O4) nanoparticles 25g/L at pH 4.0 and contact time was 250 minutes. The results showed that prepared magnetite (Fe3O4) nanoparticles can be used for the treatment of wastewater containing chromium.Bangladesh J. Sci. Ind. Res.53(3), 219-224, 2018
Cane fiber of the generas Acoruscalamus, Daemonorops Draco, Daemonoropsmollis climbing palms of tropical Asia, belonging to the family palmae (palm family) and unsaturated polyester resin were used for the preparation of composites. Cane fiber was modified with 5%, 10%, 15% NaOH solution. Various physical and mechanical properties of the composite for different orientations of fiber were measured. The physical properties i.e. water absorption of treated fiber reinforced composites is lower. But the moisture content of cane fiber decreases with higher concentration of alkali solution used for treatment. The ultimate tensile strength (UTS) is higher for treated fiber reinforced composites than the raw fiber reinforced composites for any types of orientations of fibers and the tensile strain of treated fiber reinforced composites is lower than the raw fiber reinforced composites. The UTS value for treated cane fiber composites increases with increasing weight percentage of fiber than the raw fiber reinforced composite. Bangladesh J. Sci. Ind. Res.54(3), 247-256, 2019
An analytical approach is proposed to evaluate the bit error rate (BER) performance of a direct detection on-off keying (OOK) free space optical link over log-normal atmospheric turbulence-induced fading channels based on modified Alamouti code presented by Simon and Vilnrotter and maximal ratio combining (MRC) at the receiver. Simulations show that due to coding and diversity at the receiver, a significant improvement in the BER performance is obtained at a given BER. For diversity order of 2 in both transmitter and in receiver, the amount of BER improvement is 6.6dB at BER 10-5. Further increment of the receiver diversity from 2 to 4 gives additional 3dB improvement at the same BER. A drastic improvement of the BER performance is also possible for increasing number of receiver diversity which may increase hardware complexity. Simulation results are demonstrated to confirm the analytical results.Bangladesh J. Sci. Ind. Res.53(3), 205-210, 2018
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