Volume 7 | Issue 2 | April

 Abstract

Monetary currency is the spinal cord of economy. It is the result of gradual development of centuries. Cryptocurrency is new development of context. Bitcoin and Ethereum along with several others are new fruits of monetary currency tree. Comparatively Bitcoin and Ethereum have same characteristics with distinctive differences i.e., name, operating system and market positioning etc. Both are in developing stage and need so many improvements according to need of monetary environment. Both are the landmark of monetary super highway.

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 Keywords

Cryptocurrency, Bitcoin, Ethereum, Distinctive features, Market share, Market positioning

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 Abstract

Melt spinning technique for preparation of glass

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Melt spinning technique for preparation of glass

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KEYWORDS:E-Education,C-Collaboration,I-Imaginative,E-Environment,A-Aspiration

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 Abstract

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Moisture deficit stress; Thermal regimes; Blackgram genotypes; Yield traits

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Cluster bean (Cyamopsis tetragonaloba L. Taub) is a drought tolerant annual legume, and in recent past it has acquired the status of industrial commodity with increased demand for its gum especially in oil drilling and shale gas extraction. Guar gum has the ability to suspend solids, bind water by hydrogen bonding, control the viscosity of aqueous solutions, form strong tough films have made possible for its rapid growth and use in various industries. Most of the current popular cluster bean varieties were developed and cultivated under arid conditions. With growing international demand for the guar gum, identification/development of suitable varieties for different agro climatic conditions to expand the area of cultivation is the pressing need of the hour. To address these issues, seven cluster bean genotypes RGC-1017, RGC-1003, RGC-1066, RGC-1025, RGC-936, RGC-986 and HGS-365 were evaluated for their yield potential during warm and cool seasons with varying temperature at semi-arid tropical region. There was significant difference among the genotypes for their growth and yield performance across the seasons. All the selected genotypes performed better during warm season than cool season for both biomass and seed yield. Among the seven genotypes, the total biomass at harvest ranged from 96.38 g/pl (HGS-365) to 24.88 g/pl (RGC-936) during warm condition and 11.31 g/pl (RGC-1017) to 4.31 g/pl (RGC-1066) during cool condition, whereas seed yield ranged from 23.2 g/pl (HGS-365) to 7.0 g/pl (RGC-936) during warm condition and with drastic reduction under cool weather it ranged from 2.3 g/pl (HGS-365) to 1.24 g/pl (RGC-1003). Among all the seven genotypes assessed, the genotype HGS-365 performed best in both seasons for both biomass and seed yield.

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 Keywords

Guar gum; genotypes; temperature; biomass; seed yield

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 Abstract

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 Keywords

back propagation; wind-DG Microgrid; MATLAB

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 Abstract

In power system under unbalanced AC source voltage condition the real and reactive power oscillation, over current problems are exist. Three-phase DC-AC power converters may result in serious problems and cost due to these power oscillations and over current problems. Existing solutions to handle these problems are suitably selecting and controlling the positive and negative sequence currents by using fuzzy logic control. In this work a new series of control strategies which utilize the zero sequence components are proposed to eliminate the power oscillations and improve the power control capability three-phase DC-AC converter under this unbalanced condition simulated in MATLAB.

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 Keywords

DC-AC converter; Unbalanced AC source; Control strategy; Fault tolerance

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 Abstract

In distribution systems, the nonlinear loads draws non-sinusoidal currents from the AC mains due to sudden increase or decrease of load and also affects the load harmonics and reactive power. It also produces excessive neutral currents that give smog in power systems. Due to the nonlinear features and fast switching of power electronic devices most pollution problems are created in power systems. The Shunt active power filter (SAPF) controlled PWM converters are based on current and has seen as a most viable solution. So the harmonics and reactive power compensation is presented in this paper from 3P4W micro-grid distribution system by PI controlled shunt active power filter (SAPF). The technique used to generate desired compensation current extraction is based on offset command instantaneous currents distorted or voltage signals in the time domain because compensation time domain response is quick and it produces easy implementation and lower computational load than the frequency domain. The MATLAB/Simpower Systems tool has proved that the combined system inject maximum power and compensate the reactive power and harmonic current drawn by nonlinear loads. Here fuzzy logic is used for controlling and compared with PI controller the simpered systems tool has proved that the combined system will at the same time inject maximum power and provide dynamic frequency support to the grid.

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 Keywords

Voltage Disturbances; Nonlinear Loads; PCC; Power Quality; Shunt Active Power Filter (SAPF)

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In this paper, a straightforward strategy for tracking the maximum power (MP) accessible in the wind energy conversion system (WECS) for DC microgrid is proposed. A three-phase diode bridge rectifier alongside a dc-dc converter has been utilized between the terminals of wind-driven induction generator and dc microgrid. Induction generator is being worked in self-energized mode with excitation capacitor at stator. The output current i.e. DC grid current act as a control variable to track the MP in the proposed WECS. In this manner, the proposed calculation for maximum power point tracking (MPPT) is autonomous of the machine and wind-turbine parameters. Further, a technique has been created for deciding the obligation proportion of the dc-dc converter for working the proposed system in MPPT condition utilizing wind turbine qualities, relentless state proportionate circuit of prompting generator and power balance in power converters. Circuit straightforwardness and basic control calculation are the significant points of interest of the proposed setup for supplying energy to the DC microgrid from WECS. The fruitful working of the proposed calculation for fuzzy logic based MPPT has been shown with broad exploratory results alongside the simulated values.

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 Keywords

DC microgrid; induction generators; maximum power point tracking (MPPT); Fuzzy Logic controller; wind power generation

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 Abstract

The present study was carried out from January 2009 to December 2010 to determine the important physicochemical parameters of Gosthani estuary which includes transparency, pH, temperature (atmospheric and surface water), salinity, dissolved oxygen and rainfall were studied. Pearson Correlation coefficient was conducted between various physic-chemical parameters and seasonal variations in the observations were recorded. The study showed that the water quality of Gosthani estuary was affected by industrial as well as anthropogenic activities.

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 Keywords

Physico-chemical parameters; Gosthani estuary; salinity; temperature and rainfall

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Creative Commons Attribution 4.0 and The Open Definition