Parameter Estimates of General Failure Rate Model: A Bayesian Approach

The failure rate function plays an important role in studying the lifetime distributions in reliability theory and life testing models. A study of the general failure rate model $r(t)=a+bt^{\theta-1}$, under squared error loss function taking $a$ and $b$ independent exponential random variables has been analyzed in the literature. In this article, we consider $a$ and $b$ not necessarily independent. The estimates of the parameters $a$ and $b$ under squared error loss, linex loss and entropy loss functions are obtained here

An Automated Home Made Low Cost Vibrating Sample Magnetometer

The design and operation of a homemade low cost vibrating sample magnetometer is described here. The sensitivity of this instrument is better than 10-2 emu and found to be very efficient for the measurement of magnetization of most of the ferromagnetic and other magnetic materials as a function of temperature down to 77 K and magnetic field upto 800 Oe. Both M(H) and M(T) data acquisition are fully automated employing computer and Labview softwar

Comparative study of Hemp and Jatropha oil blends used as an alternative fuel in diesel engine

Abstract: The methyl esters of vegetable oils, known as biodiesel are becoming increasingly popular because of their low environmental impact and potential as a green alternate fuel for diesel engines. Use of vegetable oils in conventional not adapted diesel engines leads to slightly inferior performance and higher smoke emissions due to their high viscosity. The performance of vegetable oils can be improved by modifying them through the transesterification process. In the present study, a comparison on the basis of the performance and emission characteristics of different blends of transesterified Hemp (B10 and B20)and Jatropha (B10 and B20) biodiesel was done on a 550 cm³ single cylinder four stroke water cooled diesel engine and the results were compared to that of diesel. Results indicated that in comparison to pure diesel and Jatropha, B20 blend of Hemp biodiesel provides better thermal efficiency, lower specific fuel consumption, reduced CO and CO2 emissions but a considerable increase was found in NOx emission and smoke density was decreased with increase in biodiesel concentration i.e. at 20%. Keywords: Bio-diesel, hemp oil, Jatropha oil, transesterification, engine performance, exhaust emissions, Indi