Panda G.,Indian Institute of Technology Kharagpur |
Dash J.K.,SikshaOanusandhan University
OPSEARCH | Year: 2014
This paper addresses a general nonlinear fuzzy chance constrained programming problem (FNCP). Both the objective function and the constraints of the (FNCP) are associated with uncertainty in the form of randomness and fuzziness. The concept of fuzzy random variable, mean and variance of a fuzzy random variable are used to develop a methodology to solve (FNCP). The methodology is explained through a numerical example. © 2013 Operational Research Society of India.
Mishra S.,SikshaOanusandhan University |
Devi N.,SikshaOanusandhan University
Hydrometallurgy | Year: 2011
The solvent extraction of copper(II) from hydrochloric acid solution has been investigated using the commercial extractant, Cyanex 921 in kerosene. The effect of hydrochloric acid concentration, extractant concentration, chloride concentration on the extraction of copper has been studied and a model has been developed for the extraction of copper(II) chloride in order to calculate the concentration of Cu2+ in the extracted organic phase. The distribution ratios of Cu(II) were determined for various concentrations of hydrogen ion, chloride ion and Cyanex 921(L) using the model and were in good agreement with the experimental data for the di-solvated species. The proposed complex formed in the organic phase is H2CuCl4.2L. A negative value of ΔH obtained from temperature variation studies show that the extraction process is exothermic. Almost 99.7% copper was recovered from the loaded organic phase using 0.2 M H2SO4 or 0.5 M HCl. © 2011 Elsevier B.V.
Shukla N.,SikshaOanusandhan University |
Mohapatra M.,SikshaOanusandhan University |
Panda A.K.,National Institute of Science and Technology
2014 International Conference on Control, Instrumentation, Communication and Computational Technologies, ICCICCT 2014 | Year: 2014
This paper deals with design, modeling and characterization of a 50nm InAlGaAs/InGaAs based HEMT which is compared with a 50nm InAlAs/InGaAs based HEMT. A performance evaluation is done considering the above two HEMTs and the DC and RF characteristics are compared for the same device dimension. For a InAlGaAs/InGaAs based HEMT, a maximum drain current of 331mA/mm at Vgs=-0.2V, a cutoff frequency of 820GHz and a maximum oscillation frequency (fmax) of nearly 1.4THz is obtained which is more as compared to the device parameters obtained for InAlAs/InGaAs based HEMT. This HEMT has a maximum drain current of 297 mA/mm at Vgs=-0.2V, a cutoff frequency of 610GHz and a maximum oscillation frequency (fmax) of nearly 1.3THz. © 2014 IEEE.
Dash P.K.,SikshaOanusandhan University |
Sahu B.N.,SikshaOanusandhan University |
Biswal M.,Silicon Institute of Technology
Journal of Intelligent and Fuzzy Systems | Year: 2014
This paper proposes a fast Time-Time (TT) filtering transform for analysis and pattern recognition of nonstationary signals. A fast TT- transform algorithm is developed with different types of frequency scaling, band pass filtering and interpolation techniques to reduce the computational cost. The new time-time transform uses dyadic and selective scaling that facilitates the extraction of relevant features from time-varying signals for recognizing their patterns. The extracted features are then passed through a decision tree based classifier for the identification of the signal patterns. Various real world simultaneous power signal disturbances have been simulated to prove the efficiency of the technique. The simulation results show superior performance of the new TT-Transform while classifying overlapping disturbance patterns. Because of the new fast TT-transform algorithm and a relatively simpler classifier methodology, this technique can be used for real time localization, detection, and classification of various power quality events including other nonstationary signal time series belonging to speech, biomedical signals, etc.
Ghatak R.,National Institute of Technology Durgapur |
Sarkar P.,SikshaOanusandhan University |
Mishra R.K.,Berhampur University |
Poddar D.R.,Jadavpur University
IEEE Microwave and Wireless Components Letters | Year: 2011
In this letter, an ultrawideband (UWB) bandpass filter with a band notch is proposed. The UWB BPF (3.1-10.6 GHz) is realized by cascading a distributed high-pass filter and an elliptic low-pass filter with an embedded stepped impedance resonator (SIR) to achieve a band notch characteristic. The notch band is obtained at 5.22 GHz. It is shown that the notch frequency can be tuned by changing the impedance ratio of the embedded SIR. A fabricated prototype of the proposed UWB bandpass filter is developed. The inband and out-of-band performance obtained by measurement, EM simulation, and that with an equivalent circuit model are in good agreement. © 2011 IEEE.