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Models with bathtub-shaped failure rate function are useful in reliability analysis and particularly in reliability related decision making and cost analysis. A modified Weibull distribution (MWD) was recently proposed by Lai et al.(2003) as a generalization of the two-parameter Weibull distribution. This distribution has both the two-parameter Weibull and the type I extreme value distributions as special cases. This lifetime distribution is able to model data with bathtub-shaped hazard rate, which is an important feature for engineering reliability analysis. Parameter estimation is...

The effects of cadmium chloride concentrations (25, 50, 75 and 100 mg/kg soil), low doses of gamma irradiation (15, 30, 45 and 60 Gy), potassium chloride (60 mg/kg soil) and the combination between cadmium + gamma and cadmium + potassium on Brassica rapa germination, growth, pigmentation, primary and secondary metabolites and antioxidative potential were investigated under laboratory and greenhouse conditions. Germination percentage and the growth of the plant root and shoot decreased progressively by increasing cadmium chloride concentrations. Gamma irradiation and potassium treatment...