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In this letter we show the effect of rotation of two oscillators on the sensitivity performance of two SAW coupled oscillator sensor configuration. The dependence of synchronization frequencies on the frequency detuning between the two counter-rotating oscillators, the insertion loss and delay of the coupling SAW delay line are analysed. The sensitivity for SAW coupled counter-rotating oscillators...
Nanobiotechnology has evolved into a unique interdisciplinary field involving physics, materials science, chemistry, biology, computer science, and multiple enginering fields. Likewise, DNA nanotechnology is a quickly developing field with esentialy no overwhelming technical dificultiesinhibitngprogres toward designing and fabricating new shapes of DNA nanostructures in al dimensions. In this field,...
This paper presents the design simulations of MEMS based micro-cantilever beam made up of PDMS properties using COMSOL Multiphysics. The cantilever beam structure on fluid Channel has been simulated. The simulations results into the stress, displacement, The study brings out a novel methodology for detection of pathogens at minute level. The in-flow methodology enables the device to be used in online...
Fully digital time-domain temperature sensors are designed and placed at five different positions within FPGA. Five tiny pulse-generators are used as five temperature sensors. Using manual floor-planning four sensors are placed at four different corners and one at centre. Single 9-bit Time to Digital Converter is utilized for digital output coding. Vernier Time to Digital Converter with 6 picoseconds...
Cadmium zinc oxide (CdXZn1−XO) thin films were deposited at low substrate temperature using advanced spray pyrolysis technique. Aqueous solution of cadmium acetate and zinc acetate were used as initial ingredients. The films were prepared by keeping optimized preparative parameters constant. Influence of variation of zinc in the ‘CdXZn1−XO’ system on the structural, electrical and gas sensing properties...
Ferroelectric and piezoelectric properties of lead-free BaTiO3 (BT), Ba0.92Ca0.08TiO3 (BCT8) and Fe doped (∼ 1.25, 1.5 and 2 wt. %) BCT8 electroceramics prepared by solid state reaction have been studied. X-ray diffraction results confirm the formation of tetragonal crystal lattice symmetry. All the samples exhibit typical polarization-electric field (P-E) hysteresis loop as well as strain-electric...
In the current paper lead-free piezoelectric ceramics BNKT, [Bi0.5(Na0.85K0.15)0.5]1−xSrxTiO3 (where x=0, 0.02, 0.04, 0.06) are prepared by conventional solid state route. Calcination studies are carried out to optimize the properties. XRD studies are carried out to confirm the perovskite phase formation. The powders are prepared in the form of discs of 10 mm diameter and 1.0 mm thickness. Subsequently,...
Electro-chemical discharge machining (ECDM) is a recent technique used to machine insulating materials like glass and ceramics. This paper presents the results of the combined effects of tool feed-rate and tool shape on the micro-machining of a quartz substrate using an ECDM process. The investigations show that a tool with a spherical tip provides a profile with a reduced entrance diameter and the...
Molecular level interactions and accessibility to binding site play a critical role in efficacy of biosensors. Details on the orientation and location of binding of a biomarker to a bioreceptor can be obtained through computational modeling and analysis. In the present paper, Molecular Dynamics (MD) was used to model the and understand the molecular interaction within a aptamer based sensor using...
The HTS SQUID sensors coupled to an on-chip integrated planar gradiometric pick-up loop were fabricated using highly reliable advanced micro-fabrication techniques such as deposition of superconducting thin films by Pulsed Laser Deposition (PLD), UV photolithography and RF ion beam etching. It may be noted that use of wire wound gradiometers and approaches based on electronic subtraction of sensor...
Graphene/carbon composite nanofibers (GCNFs) with attached TiO2 nanoparticles (TiO2-GCNF) were prepared, and their photocatalytic degradation ability under visible light irradiation was assessed. They were characterized using scanning and transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet-visible diffuse spectroscopy. The results...
Seeking alternatives not containing In and Ga, the related thin film solar cells (TFSC's) material is Cu2ZnSnS4 (CZTS), which has drawn much attention during past few years because of their easy processing ability, high efficiency at low cost, and environmental eco-friendliness. Moreover, CZTS is composed of earth-abundant elements; it has optical absorption coefficient (105 cm-1) and direct band...
Synthesis of ultrafine barium titanate (BT) nanoparticles using a simple cost effective precipitation method and their structural and morphological changes are outline in this paper. In actual, BTO precipitate was subjected to centrifuge, washing and heating processes to obtain BT nanoparticles. Special emphasis was given to the concentration of precursor (barium nitrate) and capping ligand (PVP)...
The objective of this work is to make a Surface Electromyography (EMG) signal detection sensor to test and analyze human motion pattern. EMG signal has a very small amplitude level and a frequency range of 20 Hz to 200 Hz. In order to realize the sensor, a circuit and its single layer PCB has been designed to amplify and filter the differential potential between Ag/AgCl electrodes at different points...
The present work is about preparation and characterization of high temperature oxygen sensing composite material consisting of Gadolinium doped Ceria (GDC) together with a relatively low temperature melting, ionic conducting glass to facilitate lower sintering and operating temperature. This paper reports the physical and ionic conductivity properties of this sintered composite as a function of operating...
This paper presents the design, simulation and fabrication of dielectrophoretic chip with integrated nickel 3D electrodes for bioparticle separation. Finite element analysis software COMSOL Multyphysics 4.3 is used to measure the electric field distribution and also the temperature profile inside the microfluidic channel. The temperature rise is found to be 0.5 K. Electric field distribution shows...
A system to detect the direction of the odor source using a sensor array has been designed. The system uses the relation between the responses of different sensors to determine the direction of source. A novel dynamic direction detection method based on a neural network is presented for detecting direction of ethanol odor source. Odor-Compass can be used in applications like hazardous gas leakage...
Compositions of nominal formula, SrFe1−xTixO3-δ (x = 0 − 0.8) were prepared by solid state method and characterized by X-ray diffraction and Mossbauer spectroscopic studies. Electrical conductivities of these samples were studied at different temperatures in three different oxygen concentrations. Thin films of SrFe0.2Ti0.8O3-δ and SrFe0.35Ti0.65O3-δ were deposited on polycrystalline alumina using...
There is a growing interest in developing efficient and economically viable hydrogen (H2) sensors for the swift detection of leakage of H2 in areas where hydrogen is used. In the present study we have prepared palladium catalysed antimony doped tin dioxide by sonochemical process, as a H2 gas sensing material for 1000 ppm to 8% by volume H2 gas concentration. The electrical characteristics of the...
Zinc oxide (ZnO) nanorod arrays were deposited on to the soda-lime glass substrates by wet chemical route using zinc acetate as precursor. The structural and surface morphological properties of the ZnO nanorod arrays (ZNAs) were investigated by X-ray diffraction (XRD), and scanning electron microscopy (SEM) respectively. The XRD pattern revealed wurtzite crystal structures of ZNAs, preferentially...
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