Normal mode sensitivity to Earth’s D″ layer and topography on the core-mantle boundary: what we can and cannot see

What We Can and What We Cannot Infer

What We Can and What We Cannot Infer

See What You Cannot See

DU. A national study of chronic disease prevalence and access to care in uninsured U. Engelgau MM. Self-management education for adults with type 2 diabetes: A meta-analysis of the effect on glycemic control. The health status of patients of a student-run free medical clinic in inner-city Buffalo, NY. Insuring the uninsured: A student-run initiative to improve access to care in an urban communi...

Observations of PKKP Precursors Used to Estimate Small-Scale Topography on the Core-Mantle Boundary

Stacks of global seismic data reveal the time and distance dependence of high-frequency (1-hertz) precursors to the seismic phase PKKP. Synthetic seismogram modeling shows that scattering from random small-scale topography at the PKKP core-mantle–boundary reflection point generates precursory arrivals similar to those seen in the data. Models with a root mean square core-mantle–boundary topogra...

Book Reviews TELLING US WHAT WE CAN AND CANNOT WATCH

What can we see with IVIM MRI?

Intravoxel Incoherent Motion (IVIM) refers to translational movements which within a given voxel and during the measurement time present a distribution of speeds in orientation and/or amplitude. The IVIM concept has been used to estimate perfusion in tissues as blood flow in randomly oriented capillaries mimics a pseudo-diffusion process. IVIM-based perfusion MRI, which does not require contras...