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Estimation of effects of walking speed to vertical ground reaction force
No full textThe measurement of ground reaction force (GRF) is important in biomechanical analysis for clinical gait assessment and gait research. The GRF measured by the force plate, along with the gravity, are the only significant external forces acting on the body during gait. The purpose of this study is to show the effects of walking speed on vertical ground reaction force (VGRF) Fz using Kistler quartz force platform embedded on the floor. Since considerable differences in the gait of normal subjects arises due to 'constrained' walking, so subject are made to walk with their self-selected walking speed in the walkway. Vertical component of the GRF was analysed from the recorded data using Bioware software. It was clearly observed that with increasing walking speed VGRF increased at Fz1 and F z3 whereas decreased at F z2
Tunneling effects in DNA Bases Adenine and Guanine
No full textMolecular electronics has been the centre stage of research
recently. Much interest has been shown by scientists in
exploring the electrical and electronic properties of DNA. In this paper DNA bases Adenine and Guanine are being
explored for its use as tunneling device. The molecules are
applied variable bias voltage ranging from –5V to +5V to
observe the flow of current using two-probe setup of Virtual
Nanolab. The current–voltage characteristics obtained
resemble typical tunnel diode characteristic with display of
resonant tunneling phenomenon in the molecule. The two
molecules Adenine and Guanine exhibit Negative Differential
Resistance with a considerably large Peak to Valley Current
Ratio (PVR). The observations suggest that the two molecules
may be used in molecular resonant devices. The NDR
characteristic suggests useful utilization of the proposed
device in nanoscale digital circuits. Also the large value of PVR supports the use of Adenine in power saving highdensity integrated circuits
The kinetics of Langmuir–Blodgett ZnO nano-film deposition for sensing electrodes
No full textThe kinetics of the monolayer formation of zinc oxide nanoparticles on water subphase was studied at different sample concentrations and barrier speeds. The recorded isotherms indicate that stearic acid can act as a suitable microenvironment for the deposition of zinc oxide when the spreading solution contains ~ 50% sample. The AFM image of the double layer shows that the film is nearly homogeneous with average thickness ~ 15 nm. The sensing ability of the nano-films was studied by cyclic voltammetry using ITO substrates, coated with zinc oxide nanoparticles as working electrode. It gave different reduction peaks for different pH electrolytes
Online Graphical Display of Blood Oxygen Saturation and Pulse Rate
No full textThis paper will design a non-invasive pulse oximeter using the ADuC842 microcontroller. A pulse oximeter is a medical device that indirectly monitors the oxygen saturation of a patient's blood and heart rate. The hardware has been developed for the pulse oximeter and programming/coding has been done for calculating blood oxygen saturation and pulse rate of a patient. The results are displayed on the OLED or transported to PC. The software used is ASPIRE (Advanced Systems Programming Integrating Real-time Emulation) verion 1.05. Assessing a patient’s need for oxygen is the most essential element to life; no human life thrives in the absence of oxygen
Liquid-Phase Synthesis of Nickel Nanoparticles stabilized by PVP and study of their structural and magnetic properties
No full textWe have synthesized nickel nanoparticles using nickel chloride as a precursor in ethanol using PVP (Poly Vinyl Pyrrolidone) as a surfactant and hydrazine hydrate as reducing agent at 60 °C in a facile manner. The structural analysis showed that particles are face-centered cubic and monodisperse within the PVP matrix with average size about 3 nm. The magnetic analysis shows the superparamagnetism of the single-domain nickel nanoparticles with the blocking temperature (Tb) exists around 14 K with clear hysteretic effect observation below this blocking temperature
Molecular phase separation effects on calorimetric properties GexSe80-xPb20 Glasses
No full textThe influence of molecular phase separation on thermal activation barriers of phase transformations in GexSe80-xPb20 glasses has been investigated using non-isothermal methods. Kinetic parameters of glass transition, crystallization and decomposition were
determined using differential scanning calorimetric and thermo-gravimetric measurements. The model free Kissinger and isoconversional Flynn-Wall-Ozawa methods were employed
to calculate the activation energies of thermally induced structural transitions. The observed variation in thermal properties with Ge content in place of Se could be
interpreted in terms of the formation of tetrahedrally coordinated Ge-Se structural units at expense of Se-Se units. Deviations in the activation energies of crystallization and decomposition with the extent of conversion indicate the mechanistic complexity of the
transformations as these involve different nucleation and growth events due to the presence of different phases. GexSe80-xPb20 glass with x 20 has been found to attain the maximum activation barriers showing high thermal stability and structural rigidity
Small caliber projectile velocity measurement system based on a single laser source and a single detector
Get PDFThis study presents development of an inexpensive modular system based on the measurement of time of flight (ToF) of a projectile between two parallel laser screens for velocity measurement of small caliber projectiles and can be used for both indoor and outdoor ranges. System design consists of a single source (laser diode) and a single detector is used to construct two screens. It also provides better velocity measurement accuracy because both screens are generated from same source and have same sensitivity. Velocity measurement accuracy of system is better than 0.08%. A 100 MHz digital oscilloscope is used to measure ToF, which provides 20 ns time base accuracy
Reflective Characteristics of Ni Doped Zns Nanoparticle-Pigment And Their Coatings
No full textThe influence of Ni concentration (0 – 0.100%) on the reflective properties of ZnS nanoparticle-pigment as well as on their reflective coatings has been investigated. ZnS nanoparticles synthesized via chemical precipitation method were characterized by using X-ray diffraction (XRD), energy dispersive X-ray spectroscope (EDS), scanning electron microscope (SEM), transmission electron microscope (TEM), UV-Vis absorption, fluorospectrophotometer, and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). It has been found that with the increase in the dopant concentration form 0 – 0.100%, the crystallite of ZnS particles changes from 10.00 to 3.01 nm and photocatalytic activity decreases. The structure and morphology remains virtually unchanged as well as no absorption edge in absorption spectra and luminescent peak in the luminescent spectra was observed due to doping. On comparing the diffuse reflectance, ZnS nanoparticles with 0.005% Ni, found to possess maximum diffuse reflectance, 92.51 - 97.77%. Employing these nanoparticles as reflective pigment, coating material was prepared and applied on aluminium substrate with different coating thicknesses to develop reflectors. These reflectors show maximum diffuse reflectance, 98.72 - 99.43%, for the 0.2 mm thick coating
Monitoring and grading of tea by computer vision - A review, Journal of Food Engineering
No full textTea being a high value crop throughout the world, its quality plays a significant role in its marketability. Currently, organoleptic methods such as inspection by human sensory panel, and instrument based approaches such as gas chromatography and colorimetric method have been reported as the quality monitoring tools in various stages of tea processing. These methods are time consuming, laborious, expensive and sometimes inaccurate. Therefore, to overcome the inaccuracy and inconsistency, computer vision techniques can be explored as an alternative to conventional techniques. This paper presents an overview of various computer vision based algorithms for colour and texture analysis with a special orientation towards monitoring and grading of made tea. Computer vision and image analysis are non-destructive procedures for sorting tea on the basis of its physical parameters viz. granule colour, shape, size and texture. Although diverse methods for estimation of above parameters were developed by researchers independently, all these can be related to each other
Small caliber projectile velocity measurement system based on a single laser source and a single detector
No full textThis study presents development of an inexpensive modular system based on the measurement of time of flight (ToF) of a projectile between two parallel laser screens for velocity measurement of small caliber projectiles and can be used for both indoor and outdoor ranges. System design consists of a single source (laser diode) and a single detector is used to construct two screens. It also provides better velocity measurement accuracy because both screens are generated from same source and have same sensitivity. Velocity measurement accuracy of system is better than 0.08%. A 100 MHz digital oscilloscope is used to measure ToF, which provides 20 ns time base accuracy