Abstract Background Beak and feather disease virus (BFDV) is an important disease causing agent affecting psittacines.BFDV is highly infectious and can present as acute, chronic or subclinical disease.The virus causes immunodeficiency and is often associated with secondary infections.No commercial vaccine is available and yields of recombinant BFDV
In allusion to solve the issue of fault diagnosis for bearing and other rotatory machinery, a technique based on fined-grained multi-scale Kolmogorov entropy and whale optimized multi-class support vector machine (abbreviated as FGMKE-WOA-MSVM) is proposed.Firstly, vibration signals are decomposed by fine-grained multi-scale decomposition, and the
Abstract China, the European Union, and the United States are the three largest digital economies in the world.This article compares the antitrust regulation of the digital economy in the three regions after the 2000s.It argues that over time, the antitrust regulation of the digital economy in the three regions tends to converge along three dimensi