Global climate change is correlated not only with variation in extinction rates, but also with speciation rates.However, few mechanisms have been proposed to explain how climate change Mid may have driven the emergence of new evolutionary lineages that eventually became distinct species.Here, we discuss a model of range extension followed by diverg
The Face Makeup structural integrity of solid rocket motor(SRM) grain is severely tested owing to the combined action of low temperature and pressure load under the load case of low temperature ignition.The three dimensional finite element model of SRM was created to analyze the structural integrity of the SRM grain subjected to low temperature and
A case of sarcoptic mange affecting almost all the animals of a dairy goat herd is described.This pruritic skin disease led progressively to high mortality and dramatic drop of milk yield.The lesions of the affected goats In Ground Liner were typical of a chronic and generalized-diffuse sarcoptic mange.Diagnosis was confirmed by skin scrapings and
Given the problem of three-sources uncertainty in aero engine degradation process and the assumption of normal distribution of measurement error in existing research, a Wiener process aero engine residual useful life time(RUL) prediction method with logistic distribution of measurement error was proposed.Firstly, the performance degradation model w