All extant birds are toothless, and recent molecular evidence suggests that edentulism in extant birds is the product of a single evolutionary transition to toothlessness on the line to crown birds in the Cretaceous.However, a fossil crown bird premaxilla from the Palaeogene of North America (assigned to the gastornithid Omorhamphus storchii) has A
The concept of optical antennas in physical optics is still evolving.Like the antennas used in the radio frequency (RF) regime, the aspiration of optical antennas is to localize the free propagating radiation energy, and vice versa.For this purpose, optical antennas utilize the distinctive properties of metal nanostructures, which are strong plasmo
Microbially enhanced coalbed methane (MECBM) production has drawn significant interest worldwide in recent years since the direct combustion of fossil energy sources including oil and coal, would cause global environmental pollution and have detrimental effects on human health.MECBM shows great potential in producing Bubble Bath biomethane and thus
Supercritical CO2 foil bearings are promising bearing technology for supercritical CO2 high-speed turbomachinery.The partial derivative method including complete variable perturbation of the compressible turbulent lubrication Reynolds equation is effective to predict the frequency dependent dynamic stiffness and damping coefficients of supercritica