Agricultural soils are subjected to many applied mechanical stresses that influence their behavior. Stresses arise from tillage machines, seeders and chemicals applicators, tractors, and equipment for harvest and transport. Applied stresses may compact or loosen the bulk soil. Micro sections of soil (aggregates or clods) may be compacted during tillage while the bulk soil is loosened. Because most granular soils are combined into structural units of varying sizes with different strengths and properties, prediction of the effect of stresses on the behavior of bulk soils is difficult. The basic...

Thirteen-year-old Cog loved getting her hands greasy in her Uncle's workshop and building the occasional mud-cannon before the return of her mother knocked her life completely off its rails. Before long she's stowing away on a royal airship and tricking her way into a dream apprenticeship with the Queen's master engineer by pretending to be a boy. But her situation takes a dangerous turn when she discovers a plot to assassinate the Queen and throw the kingdom into war. If she can keep her identity a secret despite her best friend developing a crush on her alter ego, unravel the deadly...

Agricultural soils are subjected to many applied mechanical stresses that influence their behavior. Stresses arise from tillage machines, seeders and chemicals applicators, tractors, and equipment for harvest and transport. Applied stresses may compact or loosen the bulk soil. Micro sections of soil (aggregates or clods) may be compacted during tillage while the bulk soil is loosened. Because most granular soils are combined into structural units of varying sizes with different strengths and properties, prediction of the effect of stresses on the behavior of bulk soils is difficult. The basic...