Understanding friction at diamond–rock interfaces is crucial to increase the energy efficiency of drilling operations. Harder rocks usually are more difficult drill; however, poor performance often observed for polycrystalline diamond compact (PDC) bits on soft calcite-containing rocks, such as limestone. Using macroscale tribometer experiments with a tip, we show that limestone rock (mostly ca...

Wireless Field Force Automation (WFFA) is a wireless solution designed to support field staff such as service personnel, repair or installation employees, technical teams, or medical workers. Certain companies try to provide their field workers with this sort of solution to improve their productivity, their effectiveness and to reduce administrative costs, but more than 50% of these projects fa...

in this paper, the direct extrusion process of bimetallic rods in conical dies is analyzed by an improved upper bound method. the deformation zone is subdivided into six smaller zones and by considering a non-spherical entrance boundary to the deformation zone, a velocity field is presented which is different from velocity fields employed in previous studies. the total power consumption of the ...

Carbon-metal oxide (CMO) nanocomposites have seen increasing research due to their extraordinary properties for energy storage materials and photocatalysts. Flame aerosol synthesis provides a promising route producing CMO nanocomposites. Various been successfully synthesized through flame techniques in laboratories. However, detailed understanding of the formation growth mechanisms such is lack...

Abstract The rapid development of molecular dynamics (MD) simulations, as well classical and reactive atomic potentials, has enabled tribologists to gain new insights into lubrication performance at the fundamental level. However, impact adopted potentials on rheological properties tribological hydrocarbons not been researched adequately. This extensive study analyzed effects surface structure,...

The derivation of the van der Waals parameters for the aliphatic CH united atoms of the GROMOS96 force field is presented. The parameters n have been adjusted to reproduce the experimental enthalpies of vaporization and vapor pressures or densities of a set of nine alkanes in the liquid state at 298 Ž . K or at the boiling point in the case of methane , using a cutoff radius for the van der Waa...

We present fully reactive interatomic potentials for systems containing gold, sulfur, carbon, and hydrogen, employing the ReaxFF formalism. The potential is designed especially for simulating gold-thiol systems and has been used for studying cluster deposition on self-assembled monolayers. Additionally, a large number of density functional theory calculations are reported, including molecules c...

casimir forces of massive ferrnionic dirac fields are calculated for parallel plates geometry in spatial space with dimension d and imposing bag model boundary conditions. it is shown that in the range of ma>>l where m is mass of fields quanta and a is the separation distance of the plates, it is equal to massive bosonic fields casimir force for each degree of freedom. we argue this equality ex...