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Long-wavelength infrared (LWIR) detectors are important in many different applications such as space surveillance systems, low-background infrared seeker-tracker systems, remote environmental monitoring, remote analysis of gases in outer space, and remote temperature measurement. One primary concern with producing LWIR detectors is that they must be made with a material having an energy band gap small...
There is a growing interest on microfluidic immunosensors for use as point-of-care diagnostic devices. In typical microfluidic immunosensors, the channel walls are functionalized with antibodies through intermediate linker molecules. The carrier fluid containing the antigens flows through the channels, and the antigens diffuse and electromigrate to the walls as the carrier fluid is convected along...
Nanoparticles conjugated with biomolecules are promising building blocks for assembly into nanostructured functional materials for developing biomarker platforms because of their size dependent optical and electrical properties. Nanoparticles and nanodevices enable study of a wide range of biological phenomena extending from biomolecular interactions such as protein-protein, antibody-antigen or DNA...
Nanoengineering requires transformational research and technologies in several areas that necessitate understanding of the nanoscale phenomena and processes using direct measurements and simulations. Computational modeling in nanoengineering is highly interdisciplinary with a potential to enhance the nanotechnology field from an empirical science to a quantitative engineering field. Computational...
Thispaper presents the design and realization of a context-aware wireless health monitoring system for recording the heartbeat (HR) and respiration (RR) rate based on an indirect measurement approach. The system consists of a contact-less medical sensor as well as a communication infrastructure for handling the transmission and reception of the measured results. The contact-less sensor includes a...
Simple, compact, robust and handy device for chemical sensing using microstrip-based metamaterial Complementary-Split-Ring-Resonator (CSRR) is proposed. A pseudo-microfluidic channel is fabricated upon the CSRR pattern to form the sensor. Combination of two liquids namely, ethanol and petrol, and their varying combinations are sensed for hybrid fuel applications. Simulation and experimental results...
Molten salt level measurement in the process vessels of pyrochemical reprocessing of spent metallic fuels is one of the key process parameters. Level measurement of hygroscopic and high temperature salts is a challenging task. It is proposed to use an ultrasonic based level measurement. The Commercially available ultra sonic level indicators have the limitations such as their physical dimensions,...
The present work represents a non contact, machine vision based method to estimate ripeness level of Guava fruit. The fruit under test is classified as green, ripe, overripe and spoiled using a web camera based computer vision system. This simple method uses a combination of digital web camera; computer and indigenously developed GUI based software to measure and analyze the surface color of the fruits...
Herein present study, organic-inorganic hybrids based on WO3/PANI nanocomposites have been synthesized at room temperature, by using oxidative polymerization. The as-synthesized products have been studied by using X-ray diffraction analysis, FE-SEM and optical characterization. The XRD analysis depicts peak broadening and the shift in peak position from standard values, which can be attributed to...
This paper presents the design details of newly developed high accuracy, compact, two axes Micro Digital Sun Sensor (Micro DSS) using linear Complementary Metal Oxide Semiconductor detector and N-shaped slit mask for Indian Satellite missions. Due to low mass, compact size and low power, the Micro Digital Sun Sensor is very much suitable for future micro/ nano-satellites as well as for communication...
The nAg/PVP and nAg/PVA composites were synthesized by using chemical reduction method. The neat Poly vinyl pyrrolidone (PVP) and polyvinyl alcohol (PVA) at different concentrations and their nano metal polymer composites were studied for electrical humidity sensing, ranging from 5–90% RH. The neat polymers and their composites were coated on ceramic rods having built in electrodes by drop casting...
Highly porous zinc ferrite (ZnFe2O4) nano-size powders are synthesized by varying fuel to oxidizer ratio. The metal nitrates are used as oxidizers while glycine is used as a fuel. The synthesis of material is carried out using an auto-combustion method. It is observed that the enhancement of magnetization occur with the enhancement of ‘Fuel to Oxidizer’ ratio i.e. Glycine to metal Nitrate (G/N) ratio...
Herein, we report the development of highly water dispersible nanocomposite of conducting polyaniline and multiwalled carbon nanotubes (PANI-MWCNTs) via novel, ‘dynamic’ or ‘stirred’ liquid-liquid interfacial polymerization method using sulphonic acid as a dopant. MWCNTs were functionalized prior to their use and then dispersed in water. The nanocomposite was further subjected for physico-chemical...
This paper reports a novel retro reflective fiber optic surface roughness sensor. The sensor probe consists of three parallel fibers and one inclined at an angle of 50. The reflector is placed at optimized distance in order to get maximum sensitivity for surface roughness measurement. Mathematical modeling of this fiber optic displacement sensor is reported based on ray tracing method. MS surfaces...
Nanocrystalline tin oxide powder is synthesized using sol gel method. To observe the effect of addition of surfactant on particle size, Sodium Dodecyl Sulphate (SDS) is added during the synthesis. The particle is found to be ∼ 8 nm using TEM. The synthesized nanophase tin oxide powder is used to fabricate thick film sensors using screen printing technique. The sensor performance is tested for 100...
Tungsten oxide is amongst the most widely used materials in electro-, photo-chromic applications. Recently tungsten oxide has been employed as sensing layer for detection of hazardous gases. In this work, we report synthesis of WO3 nanoparticles via a facile hydrothermal method using sodium tungstate and different organic acids (viz. citric acid, oxalic acid, malonic acid, and (L+) tartaric acid)...
This paper briefly explains the requirement of having reliable hybrid renewable energy sources for the sustainability of energy security of the grid. The wave parameters affecting electrical power potential of ocean waves and how these parameters are being sensed is being studied. Also the causes of waves are also discussed and these parameters are examined as well. A hybrid system with WECS and PV...
The magneto-electronic properties have been demonstrated for a novel class of ferromagnetic semiconductors based on Ga doped a-Fe2O3 (hematite) system. The doping of the Ga atoms into the lattices of Fe sites of oc-Fe2O3 structure has been performed by chemical coprecipitation and mechanical alloying routes. Among the metal doped hematite systems, Ga doped oc-Fe2O3 system has been found as a good...
In the present work, we report the room temperature NH3 sensing properties of Cobalt-boride nanoparticles intercalated polyaniline (Co-B-PANI) nanocomposite films. Polyaniline nanocomposite films (PNCF's) have been deposited at room temperatures by in-situ oxidative polymerization of aniline in the presence of Co-B nanoparticles. The PNCF exhibited a highly selective, sensitive and reversible response...
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