(SoE) School of Engineering

<p>Shiv Nadar University is a comprehensive, multidisciplinary, research-focused, and student-centric University offering a full range of academic programs at the undergraduate, postgraduate and doctoral level. With state-of-the-art infrastructure, the University comprises of academic wings, sophisticated labs, international standard sports facilities, amphitheaters, auditorium, conference rooms and smart classrooms. The University&rsquo;s goal is to become internationally recognized for the quality of its research and creative endeavors and their applicability to improving quality of life, generating new insights and expanding the boundaries of human knowledge creativity. Committed to excellence in teaching, research and service, the University aims to serve the higher education needs of India and the world beyond.</p>

Shiv Nadar University

An enlargement of candidate vector set of QR-LRL (QR - Least Reliable Layer) based MIMO detector for efficient soft output generation is proposed. Previous work [8] shows that QR-LRL based MIMO detector approaches hard decision output ML performance, but does not match the soft output ML performance due to empty candidate vector set problem. Performance degradation is more severe when modulation order is low. Some of the previous methods have provided solutions to mitigate Empty Vector Set (EVS) problem [4] [8] [9], but are not efficient in terms of performance or computation complexity. In this paper, we enlarged candidate vector set of QR-LRL detector by applying every constellation point at each layer. The proposed detector thus effectively removes EVS problem and achieves soft ML performance while keeping the computation complexity low, especially at low modulation order. © 2014 IEEE.

World University root node

Electrical Engineering

IEEE Region 10 Annual International Conference, Proceedings/TENCON

Enlarged QR-LRL based SM-MIMO detector for efficient soft output generation

Sun is a great source of energy. Solar Energy is non-polluting and one of the most efficient and affordable energy alternatives available today. Solar energy can be utilised in two ways either in the form of thermal energy or electrical energy using photovoltaic (PV). The conversion efficiency of photovoltaic depends upon its operating temperature. The operating temperature of photovoltaic module is maintained as low as possible by withdrawing/utilizing the thermal energy associated with it. The thermal energy available on the PV module can be carried away by flowing any fluid (water, air etc.) above it. This type of system is known as hybrid photovoltaic thermal (PVT) system. In the present study, the analytical expressions for temperature dependent electrical efficiency have been derived for opaque and semitransparent PV module with water flow. Then comparison between efficiencies have been done for different climatic condition of New Delhi, India. Then it is observed that there is remarkable change in efficiency when water is flow on the top of the surface of PV module. © 2015 IEEE.

Mechanical Engineering

International Conference on Energy Economics and Environment - 1st IEEE Uttar Pradesh Section Conference, UPCON-ICEEE 2015

Effect of water flow on PV module: A case study

Based on the literature review it is evident that the trend of Bring Your Own Device (BYOD) is here to stay. Traditionally Indian companies have lagged behind in the adoption of technology. This research deals how some of the Pre Selected Indian companies are adopting this technology. The selection criteria has been skewed towards companies which are either very large or have a very recognizable international brand while operating in India. The methodology used to check the adoption is through administering a survey. Also in this paper we have researched about the advantages and disadvantages/ threats that this trend brings for these organizations and mitigation strategies around it with specific focus on Mobile Device Management (MDM). © 2015 IEEE.

Computer Science and Engineering

2015 4th International Conference on Reliability, Infocom Technologies and Optimization: Trends and Future Directions, ICRITO 2015

Adoption of 'Bring Your Own Device' by Indian companies

In this study, two-dimensional (plane-stress and plane-strain) theoretical models are presented for the stress analysis of adhesively bonded single-lap composite joints subjected to thermal, mechanical loads and a combination thereof. The joints consist of similar/dissimilar orthotropic or isotropic adherends and an isotropic adhesive interlayer. The governing diffierential equations of the problem are obtained using a variational method which minimizes the complementary strain energy in the bonded assembly. In this formulation, through-thickness variation of shear and peel stresses in the interlayer is considered. All the traction free boundary conditions are exactly satisfied. Peel and shear stresses obtained from plane-strain analytical models considering mono-modulus adhesive interlayer are in good agreement with the finite element predictions. A systematic parametric study is conducted to identify an ideal set of geometrical and material properties for the optimal design of joints.

Civil Engineering

56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

A variational approach for stress analysis of single-lap composite joints under mechanical and thermal loads

A fast and easy method for fault detection in antenna arrays using infrared thermography is presented. A thin, minimally perturbing, microwave absorption screen made of carbon loaded polymer is kept close in front of the faulty array. Electromagnetic waves falling on the screen increase its temperature. This temperature profile on the screen is identical to electric field intensity profile at the screen location. There is no temperature rise observed on the screen corresponding to non-radiating (faulty) elements and hence can be easily detected by IR thermography. The array input power is modulated at a low frequency which permits thermography to detect even weak fields. It also improves the resolution of thermal images. The power fed to the array is only 30 dBm. In order to show the utility of this technique, an example of 14 GHz 4 × 4 patch antenna array is given. The simulations are carried in CST Microwave Studio 2013. A good agreement between simulation and experimental results is observed. © 2015 Elsevier B.V. All rights reserved.

Infrared Physics and Technology

Fault detection of antenna arrays using infrared thermography

This work aims at asymptotically accurate dimensional reduction of non-linear multi-functional film-fabric laminates having specific application in design of envelopes for High Altitude Airships (HAA). The film-fabric laminate for airship envelope consists of a woven fabric core coated with thin films on each face. These films provide UV protection and Helium leakage prevention, while the core provides required structural strength. This problem is both geometrically and materially non-linear. To incorporate the geometric non-linearity, generalized warping functions are used and finite deformations are allowed. The material non-linearity is handled by using hyper-elastic material models for each layer. The development begins with three-dimensional (3-D) nonlinear elasticity and mathematically splits the analysis into a one-dimensional through-the-thickness analysis and a two-dimensional (2-D) plate analysis. The through-the-thickness analysis provides the 2-D constitutive law which is then given as an input to the 2-D reference surface analysis. The dimensional reduction is carried out using Variational Asymptotic Method (VAM) for moderate strains and very small thickness-to-wavelength ratio. It features the identification and utilization of additional small parameters such as ratio of thicknesses and stiffness coefficients of core and films. Closed form analytical expressions for warping functions and 2-D constitutive law of the film-fabric laminate are obtained. © 2015 AIP Publishing LLC.

AIP Conference Proceedings

VAM applied to dimensional reduction of nonlinear multifunctional film-fabric laminates

This paper presents, design and simulation of a re-configurable ring resonator (RRR). The resonance frequency of the resonator can be re-configure by changing the biasing of diode. Change in resonant frequency is observed in diode on and diode off condition. This resonator can be re-configure from 3.17 GHz to 6.62 GHz in diode on and off condition. The proposed RRR can be used for low phase noise oscillator design. © 2015 IEEE.

2015 1st International Conference on Futuristic Trends in Computational Analysis and Knowledge Management, ABLAZE 2015

Re-configurable ring resonator for oscillator application

This article deals with the analysis of the power consumption in the piezoelectric ceramic patch of lead zirconate titanate and the losses arising from the adhesive bonding with the host structure. When a lead zirconate titanate patch is utilized as an impedance transducer in the electromechanical impedance technique, it acts both as a sensor and as an actuator (dual effect) for the range of frequency. Power consumption occurs in two forms. First part of the energy is used to actuate the lead zirconate titanate patch and produce deformations. The other part of the energy is dissipated within the piezo-mechanical system due to the internal mechanical loss and the associated heat generation. The determination of the power consumption characteristics for an active piezo-system is very important for designing an efficient intelligent structure with optimized mass and energy combination. Adhesive bond itself acts as an added stiffness, mass and damper and plays an important role in mechanical and electrical energy conversion. Hence, a detailed investigation is needed to characterize the power consumption and energy issues associated with bond layer driven by lead zirconate titanate patch, which is the main aim of this article. © The Author(s) 2014.

Fulltext

Journal of Intelligent Material Systems and Structures

Influence of adhesive bond layer on power and energy transduction efficiency of piezo-impedance transducer

A volumetric metamaterial lens exhibiting a negative refractive index (NRI) at C-band is designed and its free-space focusing properties are experimentally verified. The designed lens employs a multilayer geometry and its unit cells are loaded using metal-insulator-metal (MIM) capacitors and dual-arm spiral inductors in a biplanar configuration. These elements, although fully printed and without vias, provide strong reactive loading that enables a unit cell size of λ0/11 and allows the metamaterial's dispersion properties to be accurately modeled in the effectivemedium regime using an equivalent-circuit approach. It is also conducive to implementation at high frequencies, where surfacemount components are unusable. The focusing properties of the fabricated lens are confirmed for a band of frequencies around 5.0 GHz in an anechoic chamber using a free-space field probing system consisting of electrically small shielded-loop antennas affixed to a computer-controlled scanner. © 1963-2012 IEEE.

IEEE Transactions on Antennas and Propagation

Free-Space Focusing at C-Band Using a Flat Fully Printed Multilayer Metamaterial Lens

This work explores a methodology to optimize the layout of a electro-static discharge (ESD) structures for improving the performance of low voltage swing differential amplifier (LVDS). The parasitic capacitance of ESD structures are extracted. The role of our work is to optimize the parasitic capacitance in the I/O circuit while improving the ESD robustness. The work first compares impact of capacitance in LVDS swing behaviour and it has been observed that there is a sharp fall due to charging time constant. As ESD robustness improves by increasing the ballasting behaviour while marginal increase in capacitance, there is a much better improvement in width scaling down leads to much reduction in capacitance and thus I/O circuit improvement. © 2015 IEEE.