A five month long (April-August/2017) comprehensive study with different feeds (T1-commercial feed, T2-natural feed and T3-formulated feed) was conducted to evaluate the production potentials of green back mullet in monoculture management... more
A five month long (April-August/2017) comprehensive study with different feeds (T1-commercial feed, T2-natural feed and T3-formulated feed) was conducted to evaluate the production potentials of green back mullet in monoculture management at Brackish water Station of Bangladesh Fisheries Research Institute (BFRI) Paikgacha, Khulna. Fingerlings of Green Back Mullet (C. subviridis) were stocked at the rate of 9000/0.1 ha in each treatment. The physico-chemical parameters of water viz. transparency, temperature, dissolved oxygen, pH, salinity and total alkalinity recorded during the study period were found within optimum range. Phytoplankton (9.1*10 No/L) and zooplankton (3.5*10 No/L) concentration were also highest in T2 compared to other treatments. Average final weight was 15.88±0.89 g, 17.13±0.735 g and 14.93±0.135 g in T1, T2 and T3 respectively. In case of final weight, T1 and T3 were significantly (p<0.05) different from T2 and no significant difference (p>0.05) was found ...
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An experiment was conducted to evaluate the production potentials of brown shrimp, Metapenaeus monoceros under three different stocking densities such as 10, 20 and 30 /m2 in treatments T1, T2 ,and T3 in brackishwater ponds. After 90... more
An experiment was conducted to evaluate the production potentials of brown shrimp, Metapenaeus monoceros under three different stocking densities such as 10, 20 and 30 /m2 in treatments T1, T2 ,and T3 in brackishwater ponds. After 90 days of culture total production was recorded as 577, 608 and 764 kg/ha in T1, T2 and T3 respectively. Total production was significantly higher (p<0.05) in T3 compared to T1 and T2. Net benefit was recorded as BDT 143,109/ha, BDT 121,825/ha and BDT 162,516/ha in T1, T2 and T3 respectively. Cost benefit ratio was 2.23, 1.80 and 1.91 in T1, T2 and T3 respectively. Net benefit in T3 (BDT 162,516/ha) was higher than T1 and T2. The brown shrimp have high rates of growth, together with that they tolerate wide ranges of salinity and environmental parameters, makes them highly attractive for culture purposes.
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Each commercial and residential buildings energy management system can be efficiently/ economically realized by integration of the solar photovoltaics (acting as the renewable power generator), battery energy storage system (ESS) along... more
Each commercial and residential buildings energy management system can be efficiently/ economically realized by integration of the solar photovoltaics (acting as the renewable power generator), battery energy storage system (ESS) along with the power electronic converters. The switched boost converters are the attractive solutions for the nano-grid applications where with a single stage operation, voltage boost, storage in battery and simultaneously inversion to the required AC voltage levels can be achieved. Here, a novel switched inductor Quasi switched boost converter is proposed. The proposed converter can operate in different modes such as multiple inputs and multiple outputs for the battery storage, PV and the load. The proposed converter reduces the shoot through requirement and improves the modulation index by increasing the gain of the DC-DC stage. The benefits of the proposed converter are: 1) high gain during PV to BESS mode, 2) high modulation index for the DC-AC stage, ...
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A multilevel inverter has its own advantages over normal inverters for high voltage applications such as reduced harmonics, and better AC output. Multi-levels are realized by different techniques e.g. Flying capacitors, Neutral point... more
A multilevel inverter has its own advantages over normal inverters for high voltage applications such as reduced harmonics, and better AC output. Multi-levels are realized by different techniques e.g. Flying capacitors, Neutral point clamp capacitor, Cascaded H-bridge, and Packed U-cell. In this paper, five-level voltage is modulated for five-phase induction motor drive. Multilevel inverters for multiphase drives has coalesced benefits of multilevel and multiphase, which makes the system an excellent solution for higher voltage applications. In this paper cascaded H-bridge inverter topology has been used for generating the five-level voltage output which is then fed to the five-phase drive and a volt/hertz control is applied for proper operation of the system. The machine is made to run at different load conditions and a satisfactory result is observed through simulation which ultimately verifies the suitability of the control and modulation.
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Multiphase (more than three) power system has gained popularity due to their inherent advantages when compared to three-phase counterpart. Multiphase power supply is extensively used in AC/DC multi-pulse converters, especially supply with... more
Multiphase (more than three) power system has gained popularity due to their inherent advantages when compared to three-phase counterpart. Multiphase power supply is extensively used in AC/DC multi-pulse converters, especially supply with multiple of three-phases. AC/DC converter with multi-pulse input is a popular solution to reduce the ripple in the DC output. Single-phase and three-phase transformers and phase transformation from single to multiphase are employed in variable speed drives application to feed the multi-cell H-Bridge converters and multi-pulse AC-DC converters. Six-phase system is extensively discussed in the literature for numerous applications ranging from variable speed drives to multiphase wind energy generation system. This paper shows the systematic phase transformation technique from three-phase to six-phase (both symmetrical and asymmetrical) for both understanding and teaching purposes. Such an approach could help students understand a promising advanced co...
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Culture potential of SPF (specific pathogen-free) shrimp (Penaeus monodon) was assessed for the period of 63 days in nine on station ponds of Brackish water Station from June to August 2015. Three different stocking densities were... more
Culture potential of SPF (specific pathogen-free) shrimp (Penaeus monodon) was assessed for the period of 63 days in nine on station ponds of Brackish water Station from June to August 2015. Three different stocking densities were examined for each treatment viz.3 PL/m2 (T1), 5PL/m2 (T2) and 7 PL/m2 (T3). Water quality parameters were not significantly (P>0.05) different among the treatments except dissolved oxygen (DO). The growth and survival of SPF (specific pathogen-free) shrimp were higher in T1 than those obtained from T2 and T3 respectively and did not differ significantly (P>0.05). The final weight gain was significantly (P