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Differential static polarizability and black body radiation (BBR) shift for Ytterbium ion (171Yb+) clock transition from ground state 2S1/2 to metastable state 2D3/2 corresponding to the wavelength 435.5 nm are calculated accurately for frequency standard applications. The values are found to be −7.5(5) × 10−40 Jm2/V and −0.4(1) Hz, respectively, which are well in agreement with pre-available data...
Directional-discontinuous reception (D-DRX) is proposed for millimetre-wave enabled fifth-generation communications. In addition to conventional active, short-sleep and long-sleep states, the proposed mechanism considers a separate beam searching state, to address alignment of directional beams between user equipment (UE) and evolved node B after a sleep cycle. Semi-Markov process is explored to capture...
The artistry and science of teaching-learning curriculum in classroom based lectures and tutorials have been reinforced by contemporary interactive Information and Communication Technology (ICT) tool since its very inception. Engineering disciplines also inducted ICT based modules to fortify conceptual and problematical subjects in the very dawn of this century. These tools are seemingly intelligent...
This paper gives illustration of small signal stability analysis incorporating Doubly Fed Induction Generator (DFIG) by analyzing and comparing two shunt connected FACTS devices such as Static Compensator (STATCOM) and Static Var Compensator (SVC). The proposed work has been performed in IEEE-9 bus system using eigen value analysis. Firstly, eigen values of rotor angle and speed of alternator have...
Out of total mobile data traffic, mobile video traffic accounts for 55%. Massive increase in mobile video traffic trend and simultaneous proliferation in smart devices strains the expanding cellular network that triggers the demand to retain the quality of video. To fortify this challenge, proximity-based video delivery architectures are put forward. Four novel architectures are proposed depending...
We are developing the first optical frequency standard in India with single ytterbium ion (171Yb+), which is confined and laser cooled in an ion trap. This precision clock experiment needs to be automated for running it reliably and continuously over few days. For this we are developing a computer control systems. Some of its supporting hardware modules have already been designed and tested. In this...
We describe a system for content-based retrieval from large surveillance video archives, using behavior, action and appearance of objects. Objects are detected, tracked, and classified into broad categories. Their behavior and appearance are characterized by action detectors and descriptors, which are indexed in an archive. Queries can be posed as video exemplars, and the results can be refined through...
Dielectric engineering using high-κ oxides, such as atomic layer deposited (ALD) Al2Ox and HfOx, has been in widespread use to enhance the mobility of molybdenum disulfide (MoS2) based field effect transistors (FETs) [1,2]. This performance enhancement of MoS2 FETs in a high-κ environment is mainly attributed to the screening of Coulomb scattering from charged impurities, as well as the quenching...
Magnetic Heusler alloys that benefit from their half-metal characteristics have recently seen significant progresses in material researches and process development. As a result, current perpendicular to plane (CPP) giant magnetoresistance (GMR) has been proportionally enhanced, at least but not limited, by an order of magnitude in devices that contain such magnetic Heusler alloys and all-metal layer...
In a multi-gigawatt pulsed power system like KALI-30 GW, insulation coordination is required to achieve high voltages ranging from 0.3 MV to 1 MV. At the same time optimisation of the insulation parameters is required to minimize the inductance of the system, so that nanoseconds output can be achieved. The KALI-30GW pulse power system utilizes a combination of Perspex, delrin, epoxy, transformer oil,...
In this article, a novel lightweight user-adaptive online handwriting recognition scheme has been presented. The present recognition approach is stroke order free. It is based on prior identification of the set of various strokes of different shapes used in writing the characters of the underlying alphabet utilizing a representative sample database. In this approach a very small number of prototypes...
Wireless sensor networks based on the IEEE 802.15.4 standard have wide applications in office and industrial automation. Most of these networks utilize beacon enabled mode of operation due to the availability of sleep states which can extend the battery life. Wireless sensor nodes have little protection against radio interference and hence very susceptible to jamming. The situation becomes worse if...
In this work, the effect of dielectric constant on the bandwidth of rectangular microstrip antenna (RMSA) operating at center frequency of 2 GHz is considered. The design of a rectangular microstrip antenna is made with different dielectric materials, the choice of material is based on materials that provide good antenna performance with reduced surface wave loss. Alumina 99.5%, Quartz (Fused) and...
This paper deals with the discharge along the surface of angled insulators in compressed gases using 3D finite difference particle-in-cell simulation. The simulation is carried in pure nitrogen at atmospheric pressure. The spacer angle ‘θ’ is measured between the inclined surface and line vertical to the electrode. The angle is positive when narrow end is connected to the anode and negative when the...
This paper deals with the discharge along the surface of angled insulators in compressed gases using 3D finite difference particle-in-cell simulation. The simulation is carried in pure nitrogen at atmospheric pressure. The ionization of neutral atoms of nitrogen takes place by electron impact leading to production of positive ions and secondary electrons. The ionization cross sections of electrons...
The wide usage of touch-screen based mobile devices has led to a large volume of the users preferring touch-based interaction with the machine, as opposed to traditional input via keyboards/mice. To exploit this, we focus on the Android platform to design a personalized handwriting recognition system that is acceptably fast, light-weight, possessing a user-friendly interface with minimally-intrusive...
Controlling an aircraft during a flight is a compelling condition, which requires a strict and well coded interaction between the crew. The interaction level between the Captain and the First Officer changes during the flight, ranging from a maximum (during takeoff and landing, as well as in case of a failure of the instrumentation or other emergency situations) to a minimum during quiet mid-flight...
Polycrystalline SrBi2Ta2O9 (SBT) thin films have been prepared by pulsed laser ablation technique on platinum coated silicon substrate. The influence of growth temperature and thickness on microstructure and dielectric properties of films was studied. Crystallite size of SBT films has been found to increase with increasing substrate temperature. With increase of substrate temperature from 500 to 700...
At present, gyrotron oscillators, as sources of high power millimeter waves, play a central role in fusion energy research. Recently, spurious oscillations in high power gyrotrons gained attention as an influencing factor on the overall efficiency: in the up-taper/launcher section, a region exists where the decreasing magnetic field is alleged to excite spurious oscillations1. Numerical investigations...
Miniaturization is an essential requirement for development of space-borne electronics hardware. Recently, advancements in the device and packaging technology such as Analog Front End (AFE), FPGA and ASIC has enabled on-board designers to develop space worthy, high reliability miniaturized hardware meeting the functional and performance requirements. HMC, SIP, 3D packaging technology etc. can further...
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