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Nonlinear ultrasonic measurements has been proposed to characterize the creep damage evolution of P92 martensitic ferritic steels at a temperature of 650 °C and stresses of 100 MPa and 115 MPa, respectively. The correlation of increase-decrease-increase between the ultrasonic nonlinearity and the creep strain was achieved for both sets of specimens. Considering the metallographic studies, nonlinear...
P92 martensitic ferritic steels are an attractive material for critical components in power industries due to the excellent creep property. However, these steels are usually susceptible to creep strength degradation during a long service period under the elevated temperature and pressure. Creep damage evaluation is of concern to quantitatively assess the remaining lifespan of the critical components...
To remove the dust in coal-boiler flue gas, PPS filter is widely used on baghouse because of the excellent performance. Applications show that the components of NOx in flue gas have negative effect on filter. In the paper, some systematic experiments are designed to find the influence of concentration and contacting time of NO2 on PPS filter. The experiment data and SEM images show that the filter...
Chitinases perform a key role in defense mechanisms of biocontrol fungi against pathogenic fungi. A chitinase gene (designated Chi46) of C. cupreum which has a potential against a range of plant pathogens was amplified by RT-PCR and then integrated into the genomic DNA of pYES2 by insertion into a single site for recombination, yielding the recombinant pYES2/Chit46, which was used to transform to...
This paper is a study of the application of rough set artificial neural networks to the problem of calculating thermal error compensation values for axis positioning on a machine tool. The primary focus is on the development of a rough set approach to reduce a thermal error compensation system which is composed of all of the temperature variables. One modeling of thermal error compensation on machine...
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