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Author: Mohit Kumar × Start date: 2019 ×
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    ThesisItemOpen Access
    Tamarind wood derived soft coke for effective removal of methylene blue dye
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-06) Mohit Kumar; Goel, Puja
    Colours play an important role in our life. Colour is a source of pleasure for everybody. Dyeing substances are used to impart colour on textile, plastic, leather, cosmetics, rubber, paper or any other material which we use in our daily life. Natural dyes were used till mid19th century. After that scientists started to developed dyes from chemicals. Synthetic dyes were cost-effective and easy to apply. Nowadays every product we use has been dyed with synthetic dyes. The problem withsynthetic dyes is that most of the dyes are toxic.Dyeing is always been a water-intensive process. So, industries are generating a large amount of contaminated water. This water is later released into waterbodies and has a bad impact on the aesthetic nature of the environment. In this research, a dye removal named adsorption is discussed. Adsorption is a popular method for waste water treatment and activated carbon is a very good adsorbent for this process. Forlarger industrial applications, AC is expensive. In current thesis, Tamarind wood derived Soft Coke was used as an adsorbent to compare the efficiency with commercially available activated carbon. Total 6 sets of samples of 2,5,10 & 20 ppm concentration (volume 10ml), MB were prepared. In the first four of them, CP was used as an adsorbent and for the remaining two samples AC with variable amount was used. After 3 hours of adding the adsorbent solutions were filtered with Whatman Filter Paper No. 1. The UV-Visible data of all filtered samples were recorded. With the help of the absorbance value of all the samples, the percentage dye removal was calculated. The results show that 0.10 gm CP is sufficient for dye removal from 10 ml of 2,5,10 & 20 ppm MB solutions. The efficiency of 0.10 gm CP and 0.01 gm AC was found to be similar. On comparing the price of both of the adsorbents it was concluded that CP can be used as an alternative to AC.
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    ThesisItemOpen Access
    Design of low power inverter based OTA in FinFET technology
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-02) Mohit Kumar; Sharma, K.K.
    OTA performance analysed by following four different analysis on SPICE tool First DC analysis of proposed circuit is done on input sweep from -0.7 to 0.7 to understand the output current behaviour and finding proper operating point. The following parameter has been calculated as – Output current swing from -125μV to 125μV, differential mode transconductance 215.29 μS at IDS = 23 μA and total power consumption at Z=50Ω is 234μW. VG1 and VG4 terminal voltage can be used to tune the transconducatance value. There is no need of extra regulated on chip supply voltage. Second, Frequency response analysis is performed to calculate differential mode gain , common mode gain, unity gain bandwidth, phase margin, CMRR, PSRR. Achieved open loop gain of the circuit is 52dB , unity gain bandwidth is 1Ghz at CL = 0.1pF , phase margin is 80˚,PSRR+ obtained 52.007dB, PSRR- obtained 52.012dB, CMRR obtained 49.5dB. Positive slew rate and negative slew rate values are 1.034 v/ns and 0.83 v/ns respectively In proposed circuit noise analysis has been done at load Z=50Ω. Proposed circuit suffer with total input noise value of 1.08μV/√Hz and total output noise calculated to be 6.43nV/√Hz .