The passion of teaching at the border of order

In this text, which was originally delivered as a speech, I discuss the massive critique of teachers in the public discourse on education in Sweden over the last decade. I speak in defence of teachers, and since I am a teacher I speak in defence of myself. The critique of teachers, schooling, and teacher education has been so overbearing that a purely rational response is simply not possible. Therefore, my response is rhetorical in tone. In highlighting the passion of teaching, I lift something central for teachers, which is seldom or never taught about teaching in teacher education. Neither is the passion of teaching present in the public discourse on education. Passion, I argue in the article, is that which adds excess or an overflow of meaning that cannot be contained within the order of discourse and which therefore puts this discourse out of balance. Finally, I discuss a new balance beyond this order in the context of a classroom. In a concluding section, I highlight the struggle over borders which define who can speak and think in “good” order and who cannot.     

Analysis of a laminar-flow diffusional mixer for directed self-assembly of liposomes

The present work describes the operation and simulation of a microfluidic laminar-flow mixer. Diffusive mixing takes place between a core solution containing lipids in ethanol and a sheath solution containing aqueous buffer, leading to self assembly of liposomes. Present device architecture hydrodynamically focuses the lipid solution into a cylindrical core positioned at the center of a microfluidic channel of 125 × 125-μm² cross-section. Use of the device produces liposomes in the size range of 100–300 nm, with larger liposomes forming at greater ionic strength in the sheath solution and at lower lipid concentration in the core solution. Finite element simulations compute the concentration distributions of solutes at axial distances of greater than 100 channel widths. These simulations reduce computation time and enable computation at long axial distances by utilizing long hexahedral elements in the axial flow region and fine tetrahedral elements in the hydrodynamic focusing region. Present meshing technique is generally useful for simulation of long microfluidic channels and is fully implementable using comsol Multiphysics. Confocal microscopy provides experimental validation of the simulations using fluorescent solutions containing fluorescein or enhanced green fluorescent protein.