Dehradun, India

DIT University , erstwhile Dehradun Institute of Technology, is a private university near Dehradun in India, established by the non-profit Unison Group. DIT University has been established by Govt. of Uttarakhand vide Act No.10 of 2013 dated 15 February 2013 and is recognized by the UGC under section 2 of the UGC Act, 1956. Wikipedia.

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Kumar S.,Dehradun Institute of Technology
Optics InfoBase Conference Papers | Year: 2016

In this paper, design of reversible full-adder circuit using Lithium niobate based Peres gates is proposed. The results are verified using beam propagation method and MATLAB simulations. © OSA 2016.

The research work analyzed the impact of insertion of the V down perforated baffles in the performance of the channel flow. The test apparatus is created, and all experimentation completed in the test rig and the information gathered for Nusselt number and friction factor for distinctive arrangement of roughness parameters. The test results demonstrate the critical improvement in both the Nusselt number and friction factor of the roughened channel over the smooth conduit. The open area ratio has a significant effect on the performance parameters, and it was found that there is a significant decrement in the pressure drop with an increase in the open area ratio. Preference selection method implied on performance prediction of roughened channel with a distinctive arrangement of roughness parameters, configurations using different PDCs including Nusselt number ratio, friction factor ratio, thermo hydraulic performance factor, thermal efficiency, effective efficiency and exergetic efficiency, respectively. The results of PSI (Preference selection index) show that the optimal formulation among all the configurations is with an open area ratio (b): 12%, relative roughness pitch (P/e): 2 and relative roughness height (e/H): 0.4. © 2015 Elsevier Ltd. All rights reserved.

In the present study a methodology has been proposed to evaluate the performance of the V down perforated baffle roughened rectangular channel using hybrid FAHP-FOPSIS approach. The hybrid FAHP (fuzzy analytical hierarchy process) and FTOPSIS (fuzzy technique for order preference by similarity of an ideal solution) approach, taking into account PDAs (performance defining attributes), such as Nusselt number ratio, friction factor ratio, thermohydraulic performance parameter and effective efficiency, was used for the performance prediction of the V down perforated baffle roughened rectangular channel. The weight of different PDAs was evaluated by FAHP; Nurat (0.060, 0.093, 0.138), frat (0.045, 0.066, 0.105), ε (0.170, 0.244, 0.352) and ηeff (0.431, 0.597, 0.821), respectively. FTOPSIS was employed to determine the optimum ranking of the V down perforated baffle roughened rectangular channel and the values obtained as;C6>C5>C8>C7>C9>C10>C2>C11>C12>C1>C3>C13>C14>C4>C15>C16. The test plate (alternative) with an open area ratio (β) of 24%, relative roughness pitch (P/e) of 2 and relative roughness height (e/H) of 0.4, exhibits the optimal formulation. © 2015 Elsevier Ltd.

Gupta P.K.,Banaras Hindu University | Singh M.,Dehradun Institute of Technology
Computers and Mathematics with Applications | Year: 2011

This article presents the approximate analytical solutions to solve the nonlinear FornbergWhitham equation with fractional time derivative. By using initial values, the explicit solutions of the equations are solved by using a reliable algorithm like homotopy perturbation method. The fractional derivatives are taken in the Caputo sense. Numerical results show that the HPM is easy to implement and accurate when applied to time-fractional PDEs. © 2010 Elsevier Ltd. All rights reserved.

Asif M.,Dehradun Institute of Technology
Oriental Pharmacy and Experimental Medicine | Year: 2012

Tuberculosis is one of most pervasive, respiratory transmitted diseases and has spread to every corner of the globe. According World Health Organization report, as much as one-third of the world's population is currently infected by tuberculosis. There has been considerable interest in the currently used antimycotubercular compounds to inhibit or prevent mycobacterium species. These mycobacterium species have developed resistant against currently used drugs and produced toxic effect on long duration of therapy. These agents have different structure and almost all compounds having heterocyclic ring having one and more than one heteroatoms. These observations have been guiding for the currently used and newly developed antitubercular agents that possess potent antimicrobial activity and their side effects, activity against multi drug resistance MDR, XDR mycobacterium, and also in patient co-infected with HIV/AIDS. © 2011 Institute of Oriental Medicine, Kyung Hee University.

Chamoli S.,Dehradun Institute of Technology
Alexandria Engineering Journal | Year: 2015

The turbulence promoters are widely used to enhance the performance of rectangular channel which were used for turbine blade passage cooling. In the present study, the influence of design parameters of the V down perforated baffle roughened rectangular channel on the heat transfer and friction factor was investigated using RSM and ANN. The quadratic model generated by RSM is used to predict the performance parameters, i.e. Nusselt number and friction factor with reasonably good accuracy. The optimum values of the design parameters of the V down perforated baffle roughened rectangular channel are relative roughness pitch of 2.6, relative roughness height of 0.33, open area ratio of 18% and Reynolds number of 18,500, in the desirable range of the order of 0.95. The training of the experimental data is carried out using 4-10-2 neural network and the predicted values are compared with the experimental values and found deviation in the range of ±10% among predicted and experimental values. The comparison of predicted values by RSM and ANN with the experimental values was carried out for each run of experiment and it was observed that the RSM predicted values are in accord with the experimental values in the uncertainty range of ±5%. © 2015 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.

Binary to Binary coded decimal (BCD) converter is a basic building block for BCD processing. The last few decades have witnessed exponential rise in applications of binary coded data processing in the field of optical computing thus there is an eventual increase in demand of acceptable hardware platform for the same. Keeping this as an approach a novel design exploiting the preeminent feature of Mach-Zehnder Interferometer (MZI) is presented in this paper. Here, an optical 4-bit binary to binary coded decimal (BCD) converter utilizing the electro-optic effect of lithium niobate based MZI has been demonstrated. It exhibits the property of switching the optical signal from one port to the other, when a certain appropriate voltage is applied to its electrodes. The projected scheme is implemented using the combinations of cascaded electro-optic (EO) switches. Theoretical description along with mathematical formulation of the device is provided and the operation is analyzed through finite difference-Beam propagation method (FD-BPM). The fabrication techniques to develop the device are also discussed. © 2016 Elsevier B.V.

Khan M.,National University of Computer and Emerging Sciences | Gondal M.A.,National University of Computer and Emerging Sciences | Kumar S.,Dehradun Institute of Technology
Mathematical and Computer Modelling | Year: 2012

The chief aim of the present article is to introduce a new analytical technique, two-step Laplace decomposition method (TSLDM) for nonlinear Volterra integral equations. The newly proposed method efficiently find exact solution with less computation as compared with standard Laplace decomposition method (LDM). The proposed algorithm is used to solve nonlinear Volterra integral equations effectively and overcome the deficiencies in Laplace decomposition method (LDM) easily. © 2011 Elsevier Ltd.

Kathait P.S.,Dehradun Institute of Technology | Patil A.K.,Dehradun Institute of Technology
Applied Thermal Engineering | Year: 2014

Heat exchangers are omnipresent in every thermal system receiving or rejecting heat with its surroundings. Thermal performance of a system is highly dependent on the heat exchangers ability to transfer heat which is governed by distinct fluid flow characteristics in the tube passages. Use of corrugated tube results in higher heat exchange rates at the cost of additional power lost in friction. In search of thermo-hydraulically superior corrugation geometry, the present study investigates the effect of (modified tube surface) discrete corrugated rib roughened tube on heat transfer and frictional losses under varied fluid flow rates. Heat exchanger tubes having corrugated rib roughness with different number of gaps have been tested for pitch to rib height ratio (P/e) of 6-14 by operating under a wide range of flow Reynolds number (Re) from 7500 to 50,000. The maximum enhancements in Nusselt number and friction factor are found to be 2.73 and 2.78 corresponding to (P/e) of 10, (e/D) of 0.044 for the corrugated tube with five number of gaps. Thermo hydraulic performance parameter (η) lie between 1 and 1.76, 1.02-1.82 and 1.05-1.95 for type-1, type-2 and type-3 corrugated tube respectively. Experimental results show that type-3 corrugated tube with (P/e) of 10 is thermo-hydraulically superior than other configurations at the flow Reynolds number of 7343. © 2014 Elsevier Ltd. All rights reserved.

Indian Institute of Technology Madras and Dehradun Institute of Technology | Date: 2011-09-02

An integrated continuous-time active-RC filter comprises a set of opamp integrators with Operational Transconductance Amplifiers (OTAs). The filter further includes at least one assistant connected between the input and output of each of the integrators of the set to enhance the linearity and speed of the opamp integrators of the set. The assistant comprises a plurality of sets of transconductors connected in parallel to each other wherein each set of transconductors is formed by a pair of MOSFETs connected in series, with one MOSFET operating in the triode region and the other MOSFET operating in the saturation region. The assistant is configured to provide an assistant current to be injected into the source of each of the integrators in the set to enhance the linearity and speed of the opamp integrators of the set.

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