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Anthropomorphic hands are currently generating significant amount of interest for their variety of use, such as bionic hands in active prostheses applications, robotic grippers for remote applications as well as assisting tremor free surgical operations. Modeling of a human hand is an intricate process due to complex shapes of fingers and phalanges flexibility of the muscles. Movement coordination...
The X-ray sensitivity of direct conversion X-ray image detectors based on poly(triarylamine) (PTAA) doped with bismuth oxide (Bi2O3) nanoparticle is determined for mammography. Using COMSOL Multiphysics 5.0, the continuity equations are solved considering drift of charge carriers in the presence of deep traps. The recombination between drifting charge carriers and nonuniform electric field across...
In this paper, design and implementation of a sinusoidal flux controller has been proposed for a core loss tester for eliminating the higher order harmonics from the flux passing through the core. The core loss test is performed with a toroidal transformer that consists of a main and sense windings wound on a toroidal core. The flux through the core is calculated with the numerical integration of...
X-ray sensitivity of semiconducting polymer poly(triarylamine) (PTAA) based direct conversion X-ray detectors is determined for mammography application considering drift of charge carriers in the presence of deep traps. Using COMSOL Multiphysics 5.0, the continuity equations for charge carriers are solved considering proper initial and boundary conditions. For mammography, the calculated X-ray sensitivity...
This paper provides a bridged-T voltage control scheme for a H bridge SiC inverter switching at 150 kHz for generating various waveforms at wide range of frequencies (60 Hz to 10 kHz) which is developed as a core loss test unit. Bridged-T controller attains the advantages of both the open and closed loop controllers. It has the fast dynamic response feature of the open-loop controller and zero steady...
An output filter design is presented for high bandwidth high power inverter in this paper. Various filter topologies are compared to eliminate the switching frequency components effectively while generating various output voltage waveforms up to 10 kHz without distortion. This ultimate design consists of an R-C series branch connected in parallel with the C of conventional L-C filter resulting in...
The sensitivity of polycrystalline HgI2 (poly-HgI2 ) X-ray detector is determined. A generalized expression for charge carrier transport and absorption-limited sensitivity of X-ray photoconductors is derived by analytically solving the continuity equation for both holes and electrons considering the drift of electrons and holes in the presence of deep traps. Sensitivity is studied as a function of...
A new schematic design of power plant for achieving higher efficiency is proposed. Here, STG(Steam Turbine Generator) and GTG(Gas Turbine Generator) based power plant are taken in to account. In case of STG based power plant, net output power and efficiency(%) are calculated for different values of different parameters such that flow rate, water pressure inlet to boiler, isentropic efficiency of pump...
A LNA (Low Noise Amplifier) circuit with high centre frequency and ultra wide bandwidth is designed. IBM 90nm CMOS process is used to design this circuit. Centre frequency of this LNA circuit is 18.3 GHz. At the centre frequency gain is 14.38 decibel. 5.7 GHz is the-3 dB bandwidth of this LNA circuit. It can be operated from around 14.2GHz to around 19.9 GHz with considerably high gain. Performance...
Hydro energy is one of the most significant sources of energy of Bangladesh. Kaptai hydro electric power plant is the only major power plant using water as source of electricity production. During the flood or heavy rainfall, a huge amount of water is wasted without production of electricity because water level of Kaptai dam crosses maximum limit which is known as overflow. This paper aims at using...
An wide-band Low Noise Amplifier (LNA) is designed with differential output using IBM 90nm CMOS process. This LNA circuit has a centre frequency of 18.3 GHz. Gain of this designed circuit at the centre frequency is around 14 dB. It can be operated from around 14.2GHz to around 19.9 GHz with considerably high gain. −3 dB bandwidth of this LNA is around 5.8 GHz. Power consumption of this circuit is...
Streamlining of System of Systems (SoS) concepts by contemporary researchers have marked an epoch in the development of cross domain postmodern technologies. This demands us to reflect for a moment, and refine and mature SoS concepts and principles on universal grounds independent of any field (i.e., military). This paper spotlights the necessity of a generic System of Systems Architecture Framework...
Human biomechanical Sit-to-stand (STS) movement is a complex physiological task which requires movement coordination, balance and skillful termination. In previous studies we proposed the STS movement with different control strategies for physiologically relevant and optimized movements. These control techniques allowedus to optimize control systems designs for cost and robust performance. In this...
Human biomechanical movements are complex physiological tasks which are efficiently regulated by the central nervous system (CNS). Proprioceptors (muscle spindles) provide feedback of fascicle length and velocity from a joint to CNS, which then control the entire movement. These feedbacks have delays which are accounted for by the required output command. In this study, we used a four-link sagittal...
Sit-to-stand (STS) movement is a common human task which involves combination of a musculoskeletal structure integrated with neural control. We present a conceptual 3D bipedal nonlinear model for STS task with optimal controller design for exoskeleton torques. This model has 7 sagittal plane angles, 3 frontal plane angles, and 3 foot translational variables with 3 position based holonomic constraints...
Human biomechanical movements are complex physiological tasks efficiently regulated by the central nervous system (CNS). Proprioceptors (muscle spindles) provide feedback of fascicle length and velocity from a joint to CNS, which then control the entire movement. These feedbacks have delays which are accounted for by the required output command. In this study, we are using a four-link sagittal plane...
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