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In the present work, a novel technique for detection and classification of transient phenomenon occurring in power systems is proposed based on high order statistical moments using empirical mode decomposition (EMD). Occurrence of transient disturbances in power systems are very common and require advanced detection techniques for their proper monitoring. In this study, transient electrical disturbances...
Limited storage capacity of battery constricts the usefulness of most high technology devices such as cell phones, computers, and sensors. In the future, these limitations will become more pronounced as the demand for wireless power outpaces battery development which is already at its best. Thus, we need to come up with new power generation techniques which will be used as an energy source for the...
Driving under the influence of alcohol not only possesses threat to the driver himself but also endangers the lives of people on the road. To prevent accidents due to drunken driving, a paper is presented on an automated system that detects such situations and adopts measures to avoid it. When alcohol sensor detects certain level of alcoholic concentration, the controller will automatically stops...
Developing an accurate dosage plan for radiation therapy is crucial to the success of the treatment, yet many obstacles still exist in spite of the application of the modern technology. One such challenge is revealed in registering CT scans and MRI images, that capture the location and geometry of the prostate. Due to bodily functions and breathing of the patients, the prostate moves with respect...
Preliminary design of the central solenoid (CS) for SST-2 and Indian DEMO reactor has been initiated. The expected maximum magnetic field calculated by magnet design code MAC at the conductor location is ∼13 T. The key role of the CS magnet is for initiating efficient plasma current and maintaining it for longer duration. In order to maximize the CS capability, the higher magnetic field with a greater...
Salt and pepper noise removal is extremely challenging task when the noise density is very high in the corrupted image. Usually the existing filters are not capable of removing this noise above 70% density. This paper proposes a Sequentially Combined Mean-Median Filter (SCMMF) based on combination of arithmetic mean and median technique. A binary flag image is generated with the help of identified...
The ITER Steady State Electrical Network (SSEN) is an AC distribution system that provides approximately 120MW of power to supply all of the conventional loads of the ITER facility. The US Domestic Agency is responsible for the procurement and in-kind contribution of 75% of the SSEN equipment, all of which consists of standard commercial grade AC power systems components. This paper reports on lessons...
The propagation geometry involving the satellite-to-receiver ray path and the magnetic field line plays an important role in determining the effects of equatorial ionospheric irregularities. An extensive study has been conducted involving eighteen GAGAN Reference Stations extending from the magnetic equator through the northern crest of the EIA and beyond in the Indian longitude sector. Propagation...
Energy and reliability optimization are two of the most critical objectives for the synthesis of multiprocessor systems-on-chip (MPSoCs). Task mapping has shown significant promise as a low cost solution in achieving these objectives as standalone or in tandem as well. This paper proposes a multi-objective design space exploration to determine the mapping of tasks of an application on a multiprocessor...
This paper presents a run-time resource manager for NoC-based many-core architectures that dynamically determines the most effective mapping of tasks on the processing nodes of the architecture to optimize system reliability while leveraging on performance and communication energy. An adaptive engine is exploited to pursue the given optimization goal taking into account various metrics. Experimental...
Short wavelength single photon sources are useful for quantum optical devices, in particular for applications such as free space quantum cryptography. Semiconductor quantum dots (QDs) have proven to be ideal for the generation of single photons and single photon sources have been demonstrated with InAs, InP, ZnSe and GaN quantum dots at temperatures ranging from 4K to 300K.1–4 GaN nanowires with InGaN...
This paper proposes a simple scheme to optimise the end-to-end user throughput of small, multi-hop wireless networks. The scheme which involves the introduction of small delays between successive packet transmissions at the source node has been tested on an indoor wireless mesh testbed for uni-directional flows of data traffic with nodes that use Chirp Spread Spectrum technology. Results from a series...
Suppression of relaxation bottleneck and subsequent polariton lasing is observed in a GaAs-based microcavity under the application of a magnetic field. The threshold injection current density is 0.32 A/cm2 at 7 Tesla.
Polariton lasing is observed in a single ZnO nanowire-microcavity at room temperature. The Rabi splitting is 103 meV and the emission is polarized perpendicular to the nanowire c-axis.
Sensitive, reproducible multi-parameter sensor properties are demonstrated by using an amorphous organic semiconductor as an active layer of the field effect transistor. Anodized aluminium as a nano gate insulator allowed low power OFET fabrication. Utility of such device over the chemiresistor is described. A highly sensitive NO2 sensor that shows selectivity over a range of analytes e.g. alcohols,...
Toxicity of nano scaled Ga2O3 and functionalized (carboxyl -COOH; amine -NH) nanoparticles was examined against a gram positive (Staphylococcus aureus) and gram negative (Escherichia coli) bacteria. NP concentrations in the range of 0.25 to 25 µg/mL were tested. Strain specificity in antimicrobial activity was observed. Ga2O3 treatments resulted in 26% inhibition of growth of planktonic cells in S...
This paper presents preliminary results from a simulation-based study of static, wireless multi-hop networks with linear chain topologies supporting the uni-directional flow of data. Chain lengths of up to 10 nodes have been examined. The effects of varying parameters such as the number of nodes, the MAC data rate, the offered load and the packet size have been investigated. In addition, the influence...
In recent years, wireless mesh networks have emerged as a viable means of communications, not least because of their ease of deployment and cost-effectiveness. There are still, however, a number of challenges involved in designing and implementing such wireless multi-hop networks. This paper describes some of the preliminary work carried out for the development of an experimental mesh testbed employing...
Lasing from exciton-polariton Bose-Einstein condensates is a subject of intense research as these ultra-low threshold light emitters have the potential of solving today's high energy consumption rate in ultrafast optical communication networks and medical diagnostics. In large bandgap semiconductors such as GaN, it is possible to observe polariton lasing at room temperature because of the large exciton...
This paper deals with the estimation problem in three-phase, three-level neutral point clamped (NPC) converter via nonlinear observer. An observer based on adaptive backstepping approach is used for capacitor voltages estimation. It is assumed that capacitance value of the DC-link capacitors are unknown.
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