Hydrodynamic and Contact Contributions to Continuous Shear Thickening in Colloidal Suspensions.

Shear thickening is a widespread phenomenon in suspension flow that, despite sustained study, is still the subject of much debate. The longstanding view that shear thickening is due to hydrodynamic clusters has been challenged by recent theory and simulations suggesting that contact forces dominate, not only in discontinuous, but also in continuous shear thickening. Here, we settle this dispute using shear reversal experiments on micron-sized silica and latex particles to measure directly the hydrodynamic and contact force contributions to shear thickening.

Development and outcomes of an online-onsite hybrid dental admissions enhancement pilot program.

The University of Missouri-Kansas City (UMKC) School of Dentistry has piloted two years of an Admissions Enhancement Program (AEP) with students from underrepresented minority groups and/or economically disadvantaged areas of Missouri interested in applying to dental school. The AEP utilizes an innovative online-onsite hybrid format to elevate students' foundational knowledge in biology, chemistry, organic chemistry, and quantitative reasoning. The online component includes interaction with UMKC instructors using tablet technology and Wimba virtual classroom sessions.