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Purpose An unknown UV 280 nm absorbing peak was observed by SEC for protein stability samples formulated in L-histidine during a stress stability study. Understanding the source would enhance the confidence in the SEC results. We identified the unknown peak, studied the cause, and evaluated ways to eliminate it. Methods The unknown peak was fractionated by preparative size exclusion chromatography...
Coal-mine gas disaster is one of the most serious coal-mine disasters in China. The main component of coal-mine gas, methane is chemically stable and very difficult to be degraded by conventional methods. Hydroxyl radical (OH), due to strong oxidizing ability and high electro-negativity, is the primary degradation source of atmospheric methane. In the present study, methane degradation using hydroxyl...
For the first time, a high speed flash ADC is developed for reliability analysis and simulation of analogue and mix-signal circuit. All the three failure mechanisms (NBTI, HCI, TDDB) are quantified with degradation models. The result shows that pMOS degradation especially NBTI is the most detrimental failure mechanism for the normal operation of high speed ADC, which leads to the fault output. Based...
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