Heritage Institute of Technology

About: Heritage Institute of Technology is a based out in . It is known for research contribution in the topics: Support vector machine & Transconductance. The organization has 581 authors who have published 1045 publications receiving 8345 citations.

A study of earthquake-induced vibration on laminated composite plates using finite element method

Abstract: This study presents the dynamic response of an eight-noded composite plate under earthquake excitation. Koyna earthquake excitation frequency is considered for the present study. Central displacement and stresses at various positions are studied extensively. Variation in response under different boundary conditions and varying geometric conditions are presented. The ply angle in a lamina and the number of layers in a plate are also varied to observe their effect on displacement and stress. In almost all the cases, 45° lamination shows maximum displacement response, whereas 0°/90° lamination scheme always shows maximum normal stress values. On the other hand, inplane shear gives maximum response whenever a − 45° layer is present. The effect of plan dimension on displacement is also presented here. The displacement response is maximum when the plate becomes square for both cross- and angle-ply laminations. The displacement response with change in total thickness of the plate is presented in this article. The response increases drastically as the plate becomes thinner for angle and cross-ply laminations. The plate becomes unstable as the side to thickness ratio increases beyond 50. The variation of stresses for cross- and angle-ply laminated plates across their layers is reported here with different boundary conditions. A very important observation made through this comparison as a 45° clamped laminated plate should be designed under transverse shear stress, whereas the simply supported plate should be designed under inplane shear stress.

Dependence of small-signal properties of Si/Si0.9Ge0.1 DDR IMPATT on input current density at millimeterwave frequency

Abstract: Conductance, susceptance, reactance, quality factor and noise factor of Si09Ge01IMPATT diode are numerically computed using double iterative method and modified Runge-Kutta method when device is operated at millimeterwave frequency region. Poisson's equation, carrier diffusion equation and continuity equation are simultaneously solved are in presence of mobile space charge subject to the appropriate boundary conditions at the edges of depletion layer. Input current density is varied to compute the small-signal parameters within practical limit, and stability of the device is studied in terms of quality factor from the G-B plot. Simulation suggests that the heterostructure diode is more stable than homostructure IMPATT, similar like the noise factor. Result is significant for operating the diode as alternative but more efficient microwave source than conventional one.

Closed-form design expression for first null beam width with Taylor distribution

Abstract: Present article proposes a closed-form design expression of First Null Beam Width (FNBW) of a broadside linear antenna array with Taylor distribution. The design expression is formulated by observing the variation of FNBW with respect to the number of elements, inter-element spacing and side-lobe ratio. Effectiveness of the proposed design expression is illustrated through comparative study.

Characterization of the kinetics of Fe (II) binding by the R2 protein subunit of E. coli ribonucleotide reductase

Abstract: The kinetics of Fe(II) binding to Escherichia coli Ribonucleotide reductase (R2) has been studied using rapid kinetics techniques including chemical quenched flow (CQF) Mossbauer spectroscopy. Based on the stopped flow absorption (SF-Abs) and CQF Mossbauer spectroscopy results, the pre-steady kinetics of binding of Fe(II) to the two sites A and B on R2 have been established with attendant conformational changes. Fe (II) binds to Site B tighter and faster and these and other results provide important information towards the di-iron cofactor assembly mechanism in R2 and could have possible implications for the development of modified and new anticancer and antiviral drugs.