Based on an Atoms-in-Molecules (AIM) analysis, Matta et al. recently claimed evidence for the existence of hydrogen-hydrogen bonding between ortho-hydrogen atoms, pointing towards each other from adjacent phenyl groups in planar biphenyl. This AIM result is opposed to the classical view that nonbonded steric repulsion between the ortho-hydrogen atoms is responsible for the higher energy of the ...

We study the energy-momentum tensor of spherically symmetric $U(1)$ gauged Q-ball configurations in two-component Fridberg-Lee-Sirlin-Maxwell model, and one-component scalar model with a sextic potential. evaluate distributions corresponding shear forces pressure stability criteria for these solutions. present results numerical simulations both models, explicitly demonstrating that electrostati...

Based on direct numerical simulations of the coupled motion of particles and fluid, this study analyzes the collective hydrodynamic and colloidal effects of flowing microparticles during the formation of different 3D clogging patterns at a pore entrance. Simulations of flowing suspensions through a pore with various simulation conditions show that particle concentration and surface interactions...

In the midst of the second world war, Derjaguin and Landau in Russia and Verwey and Overbeek in The Netherlands arrived independently at a theory to explain the kinetic stability of colloidal dispersions. The celebrated DLVO theory combined two types of forceslong-ranged electrostatic repulsion and short-ranged van der Waals attractionto predict the rates at which nanoand microparticles aggre...

Quantities associated with Casimir forces are calculated in a model wave system of one spatial dimension where the physical ideas are transparent and the calculations allow easy numerical evaluation. The calculations show strong dependence upon fixedor free-end (Dirichlet or Neumann) boundary conditions for waves on a one-dimensional string, analogous to infinitely-conducting or infinitely-perm...

Deposition of particles while flowing past constrictions is a ubiquitous phenomenon observed in diverse systems. Some common examples are jamming salt crystals near the orifice saltshakers, clogging filter systems, gridlock vehicular traffic etc. Our work investigates deposition events colloidal microspheres over microstructured barriers microfluidic devices. The interplay DLVO, contact and hyd...

Choosing a career within the military has many positive and negative factors associated with it. For instance, many recruits join as young adults when they are beginning to shape their own values, beliefs and attitudes about their self, world and others. The armed forces (AF) culture socialises these young adults, leading them to adopt military values and ideals as their own which they will pro...

An extending axon growth cone is subjected to attractant and repellent cues. It is not clear how these growth cones discriminate the two opposing forces and select their projection paths. Here, we report that in the Drosophila nerve cord the growth cones of longitudinal tracts are subjected to attraction by the Netrin-Frazzled pathway. However, the midline Slit neutralizes this pathway in a Rob...