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This paper presents an experimental method for evaluating the effusivity values of different scratched temperature sensors. These sensors have a response time on the order of microseconds (50 ??s) with a rise time less than (0.3 ??s). Two types of scratch were used, mainly abrasive papers with different grit sizes and scalpel blades with different thicknesses to form the sensor junction. The effect...
The aim of present study is to investigate and analyzed the thermal properties of TiO2 composite material, by using the comparison method of pin fin heat exchanger. The thermal properties of TiO2 composite material can easily been find out by pin fin heat exchanger. Here it is used the plane copper material to coat the TiO2 composite material because of the good thermal conductivity of the copper...
The Bi2Sr2CaCu2O8 (Bi-2212) superconductor powder with 5% nanosize MgO addition was used to fabricate Bi-2212 tapes through the dip-coating-then-stacking method. In this method, the tapes were prepared by stacking layers of single side dip-coated silver strips, and then wrapping them with silver foil. The tape samples were rolled and pressed to increase the packing density of the superconductor core,...
Field studies on the environmental conditions and occupant comfort were carried out in air-conditioned buildings and non air-conditioned buildings in Malaysia. The study on the air-conditioned buildings was carried out in UNITEN and for the non air-conditioned buildings in two schools, which is a primary and secondary school, and in a public waiting area in a health clinic in Johor Bahru, located...
Wind tunnels and other aero-thermal experimental facilities are likely to make a contribution to the optimisation of energy and propulsion systems for the foreseeable future. Short duration wind tunnels such as shock tunnels and gun tunnels rely on a transient compression process and are likely to generate significant turbulent fluctuations in the nozzle reservoir region. In the present study, the...
Indian power sector is highly energy deficient with grid frequency going as low as 48 Hz. Constraints on electricity usage from state electricity boards are imposed on industrial and commercial sectors so as to minimize load curtailment in residential sectors. Also with climate change playing an increasing role in our lives, efforts are underway to promote energy efficiency in infrastructure usage...
There is presently considerable research interest in using wireless and mobile technologies in patient health monitoring particularly in hospitals and nursing homes. For health monitoring, an intelligent agent based hierarchical architecture has already been published by one of the authors of this paper. Also, the technique of monitoring and notifying the health of patients using an intelligent agent,...
Waste wood, a renewable energy source is used as feedstock for Universiti Teknologi Malaysia's newly-developed two-stage incinerator system. The research goals are to optimize the operation of the thermal system, to improve its combustion efficiency and to minimize its pollutants formation. During experimental work, the feedstock will undergo four different processes; drying, devolatilisation, gasification...
A simple sensor head based on a single fiber Bragg grating (FBG) for simultaneous measurement of strain and temperature is proposed. The FBG, inscribed on the fusion splicing joint region between a single-mode fiber and a side-hole fiber, has two Bragg resonant wavelengths, which respond differently to strain and temperature. Strain-temperature discrimination and simultaneous measurement are therefore...
The detection of ethanol in water/ethanol mixtures has been tested using an electromagnetic wave non-invasive sensor operating at frequencies ranging from 1G HZ to 10 GHz (microwave frequency domain) and using very low power <1 mW. The sensor is composed by a tuned cavity operating in reflection mode (S11 parameter). The cavity has a standard WG9A size and is working in the TE10 mode. The tests...
This paper describes the evaluation of mental workload of specialists for ship handling. We evaluate the specialists' performance using a real ship. We show the effect of physiological indices from the specialists' performance and the characteristics of their mental workload with heart rate (heart rate variability: R-R interval), nasal temperature and salivary amylase activity. In this paper, we confirm...
Understanding the heat transfer processes of compression-ignition engines requires attention to both convection and radiation components. Although a number of correlations for convective heat transfer in engine environments have been implemented in simulations with some accuracy, reliable correlations for the radiant heat transfer are yet to be developed. Most radiant heat transfer correlations are...
In this study, potato waste bioethanol was evaluated as an alternative fuel for gasoline engines. The pollutant emissions and performance of a four stroke SI engine operating on ethanol-gasoline blends has been investigated experimentally and theoretically. In the theoretical study, a quasi-dimensional SI engine cycle model has been adapted for spark ignition engines running on gasoline-ethanol blends...
Thermal rating calculation for bare overhead conductor can be done by using conductor Weather Model (WM). The critical information required in verification of the thermal rating calculation result is the conductor temperature. This paper discusses about experiments that has been conducted to verify the accuracy of the conductor temperature calculation. The experiment was also conducted to determine...
In this paper, we present an approach to analyse the degradation behaviour of the gate dielectric of thousands of MOS transistors simultaneously. Our approach is based on array test structures and automated test systems. The array test structures with a matrix-like arrangement of the MOS devices under test (DUT) have been designed and fabricated in a 130 nm mixed-mode CMOS process. They permit to...
Commercial lithium-ion batteries are playing important roles as energy storage solutions for portable devices, automotive electronics and renewable energy systems. In order to maximize the performance of lithium-ion batteries, an advanced charging pattern is required. In this paper, a Taguchi-based algorithm is presented. Orthogonal arrays are implemented to determine the optimal charging pattern...
The paper introduces a silicon controlled rectifier (SCR)-based device with high holding voltage for ESD power clamp. The holding voltage can be increased by extending a p+ cathode to the first n-well and adding second n-well wrapping around n+ cathode. The increase of the holding voltage above the supply voltage enables latch-up immune normal operation. The device is fabricated by 0.35 um BCD (Bipolar-CMOS-DMOS)...
The explosive growth in the process control industries has increased the requirement of automatic calibration of devises drastically. In process control industries calibration of different measuring instruments for temperature, voltage, pressure, current, etc. is mostly done manually. Some of the industries use software based approach for calibration. In this paper a generalized module for automatic...
Ongoing research during the past few years, envisions the development of an integrated functional imaging methodology to study brain function in-vivo and ex-vivo through a multi-modal, multi-spectral approach using non-ionizing radiation to provide combined functional information from molecule to tissue level. The scope of this research is threefold: (a) provide non-invasive, non-ionizing functional...
A piecewise curvature-corrected bandgap reference (BGR) is presented. It features in utilizing a piecewise curvature-corrected current generator and an operational amplifier biased by a current proportional to absolute temperature (PTAT) to a conventional first order BGR. The piecewise current corrects the nonlinear temperature term of the first-order BGR in the higher temperature range (TR). The...
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