Motilal Nehru National Institute of Technology Allahabad

About: Motilal Nehru National Institute of Technology Allahabad is a education organization based out in Allahabad, Uttar Pradesh, India. It is known for research contribution in the topics: Computer science & Control theory. The organization has 2475 authors who have published 5067 publications receiving 61891 citations. The organization is also known as: NIT Allahabad & Motilal Nehru Regional Engineering College.

Implicit-Function-Based Design and Additive Manufacturing of Triply Periodic Minimal Surfaces Scaffolds for Bone Tissue Engineering

Abstract: Regeneration or repairing an injured tissue using porous scaffolds, to rehabilitate the mechanical, biological and chemical actions, is one of the better options available, for tissue engineering and trauma cure. In this work, the nature-inspired gyroid architecture is selected for design of porous scaffolds. Implicit-function-based modeling is performed to understand the basic geometric characteristics of this complex architecture. A study on the effect of tuning the offset parameter (t) used in the gyroid equation, on the scaffold porosity and specific surface area, is carried out. Further, gyroid scaffolds with varying porosities and interconnected pores are modeled and subsequently manufactured using the fused deposition modeling (FDM) additive manufacturing (AM) technique, with polylactic acid (PLA) filaments. Results show that the function-based gyroid modeling is ideally suited for the design and AM of continuous porous scaffolds. Compression test is also conducted on AMed scaffolds to examine their load bearing ability. Tests reveal that the porous scaffolds have compressive strength equivalent of that of the human trabecular bone. Additionally, this study investigated in vitro, the cell viability of PLA gyroid scaffolds by measuring the cell proliferation after 48 and 72 h showing expected biocompatibility. In conclusion, the FDM manufactured gyroid scaffolds seem to be a viable alternative for bone tissue engineering applications.

Computational Techniques for Solving Differential Equations by Cubic, Quintic, and Sextic Spline

Abstract: In the present paper we describe a survey on recent spline techniques for solving boundary value problems in ordinary differential equations. Here we discuss the summary of the articles between 2000 and 2007 based on cubic, quintic, and sextic splines. Comparisons of methods with our own critical comments as remarks have been included.

A Two-Dimensional (2D) Analytical Modeling and Improved Short Channel Performance of Graded-Channel Gate-Stack (GCGS) Dual-Material Double-Gate (DMDG) MOSFET

Abstract: A Double-gate (DG) metal-oxide-semiconductor field effect transistor (MOSFET) is emerging device architecture in sub-nanometer regime. The performance of DG MOSFET can be ameliorated by gate and channel engineering. The concept of graded-channel gate-stack (GCGS) and dual-material (DM) are incorporated in DG MOSFET. A two-dimensional (2D) analytical surface potential model for GCGS DMDG MOSFET is developed based on the solution of Poisson’s equations with appropriate boundary conditions. It has been found that analytically modeled data is in good degree of agreement with numerically simulated data. The combination of both DM and GC concept introduces a step variation in potential profile at the junction of both materials in channel region and ameliorates the short channel effects (SCEs). A suppressed subthreshold swing (SS) and drain induced barrier lowering (DIBL) has been observed in the device due to an elevated average velocity of carrier and reduced drain field effect by the use of DM and GC with GS. Further, analog/RF characteristics such as transconductance generation factor (TGF), cut-off frequency (fT) and transconductance frequency product (TFP) have been examined with different GS high-k dielectrics. The numerically simulated data has been extracted using 2D ATLAS device simulator.

Synthesis and Raman signature for the formation of CdO/MnO2 (core/shell) nanostructures

Abstract: In the present report, bare CdO and CdO/MnO2 core/shell nanostructures of various cores and different shell sizes were synthesized using co-precipitation method. The phase, size, shape and structural details of the bare CdO and CdO/MnO2 nanostructures were investigated by X-ray diffraction, transmission electron microscopy (TEM), and Raman spectroscopy measurements. TEM micrographs confirm the formation of core/shell nanostructures. The presence of CdO (core) and MnO2 (shell) crystal phases was determined by analyzing the Raman data of bare CdO and CdO/MnO2 core/shell nanostructures. The Raman spectra of bare CdO nanostructures contain one broad intense convoluted envelop of three bands in the spectral range of 200–500 cm−1 and a weaker band located at ~940 cm−1. The intensity of these two Raman bands is decreased with the increase of shell size and disappeared completely for the shell size 5.3 ± 1 nm. Further, two new Raman bands appeared at ~451 and ~665 cm−1 for the shell size 1.3 ± 0.1 nm. These two Raman bands are assigned to the deformation of Mn–O–Mn and Mn–O stretching modes of MnO2. The intensity of these two Raman bands is enhanced with the increase of shell size and attains a maximum value for the shell size 5.3 ± 1 nm. The disappearance of characteristics Raman bands of CdO phase and the appearance of characteristics Raman bands corresponding to MnO2 phase for nanostructures of shell size 5.3 ± 1 nm authenticate the presence of CdO as core and MnO2 as shell in the core/shell nanostructures. Copyright © 2014 John Wiley & Sons, Ltd.

Performance Evaluation and Comparison of AODV and DSR Under Adversarial Environment

Abstract: A mobile ad-hoc network (MANET) can be described as a mobile wireless network, consisting of a collection of communication nodes, which have to interact among themselves without the use of any centralized authority or fixed infrastructure. There are several technical challenges regarding deployment of a MANET, such as network scalability, communication stability, energy consumption, security and quality of services (QoS). Due to vulnerability of wireless links, nodes unstable infrastructure support and highly dynamic network states, MANET security becomes an essential design dimension. initially while designing MANET routing protocols security aspects were not considered, so routing protocols are vulnerable to various types of security attacks such as rushing attack, black hole attack, replay attack, jellyfish attack, wormhole attack, spoofing attack etc. In this paper we have discussed wormhole attack. In this paper, through simulation the effects of wormhole attack on Ad-hoc On Demand Distance Vector Routing (AODV) and Dynamic Source Routing (DSR) protocols have been analyzed and compared.