Nurses' perceptions of aids and obstacles to the provision of optimal end of life care in ICU

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Influence of Tetraisoamylammonium Picrate on the Repulsive Energy Between Colloidal Particles in Benzene

A study was made on the influence of molar volumes and of polarization of tetraisoamylammonium picrate in benzene on the repulsive energy between spherical colloidal particles. The spherical colloidal particles (radius 1 μ) are taken to be at a negative constant surface potential. In comparison with the classical Derjaguin-Landau and Verwey-Overbeek theories, we observe a large increase of the repulsive energy due to the strong polarizability of the tetraisoamylammonium cation, whereas the finite molar volume of this cation weakly decreases the repulsion. All the effects (polarizability, molar volume) increase with the surface potential and the concentration of the solute. © 1971.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

The influence of coolant on tool deterioration of uncoated carbide tools in endmilling hardened inconel 718plus nickel based superalloy

Acritical reviewhas been carried out in the literature in order to investigate the impact of the coolant in machining hardened nickel-based superalloy; however little has been found. The increase in strength of a workpiece material generates a high cutting force during the material removal process, therefore reduce the tool life. As a result of limited knowledge addressing the role of coolant in enhancing the life of the cutting tool, this research intends to investigate the influence of coolant on tool deterioration of a hardened nickel-based superalloy. Milling experiments were conducted a hardened state of Inconel 718Plus nickel-based superalloy with uncoated carbide tools in dry and wet conditions. Experimental results showed that on average, both dry and wet conditions allowed for four passes (Npass) before the end of tool life