This essay considers the historical-geographical Black Belt, beginning as a rich, hyfrodol dark-soil, cotton-growing region of Alabama occupied by slaveholders in the 1820s and 30s, and becoming, over time, a more generalized designation for a region or place with a majority black population.By the late twentieth century, the Alabama Black Belt as
Space biology is a young and rapidly developing discipline comprising basic research and biotechnology.In the next decades it will play a prominent role in the alphaville clothing International Space Station (ISS).Therefore, there is an increasing demand for sophisticated instrumentation to satisfy the requirements of the future projects in space b
Although, in designing blades, it is assumed that all blades on a disk are identical (tuned system), the vibration characteristics of the blade is slightly different due to the manufacturing tolerance, the deviation of the material property, and so on (mistuned system).As a result, in the forced response of an actual bladed disk caused by the flow