ABSTRACT
The traditional conception of lying, according to which to lie is to make an assertion with an intention to deceive the hearer, has recently been put under pressure by the phenomenon of bald-faced lies i.e. utterances that prima facie look like lies but because of their blatancy allegedly lack the accompanying intention to deceive. In this paper we propose an intuitive way of reconciling the phenomenon of bald-faced lies with the traditional conception by suggesting that the existing analyses of the phenomenon overlook a non-obvious category of hearers whom the speakers of bald-faced lies intend to deceive. Those hearers are institutions represented by the people involved, such as courts or secret police. We also criticize two recent rival accounts (Jessica Keiser's and Daniel Harris's) that attempt to save the traditional conception by saying that some bald-faced lies are not assertions, because they are conventional-rather than illocutionary-speech acts.
ABSTRACT
PURPOSE: Titanium and its alloys are widely used as biomaterials for long-term implants, but they are usually surface-modified due to their weak bioactivity and wear resistance. Laser processing was used to modify the surface layer, and elemental carbon was a component of the deposited coatings. This research aims to use a combination of both methods based on preliminary electrophoretic deposition of multi-wall carbon nanotubes (MWNCTs) followed by pulse laser treatment. Carbon nanotubes were chosen due to their mechanical and chemical stability as well as their tubular shape, resulting in enhanced mechanical properties of laser-modified layers. METHODS: The pulse laser power and laser scanning speed were defined as variable process parameters. The microstructure, roughness Ra, nanohardness H, Young's modulus E, and indent depth values were measured, and the H/E, H 3/E2, and relative changes of all these values in comparison to MWCNTs-coated and non-coated surfaces, were calculated. RESULTS: The obtained results show that the best mechanical properties of MWCNTs-coated and laser-treated specimens are obtained at a laser power of 900 W and laser feed of 6 mm/s. The observed relations can be explained considering processes occurring on the surface such as deposition of carbon nanotubes, melting and re-crystallization of the surface layer, formation and possible partial decomposition of titanium carbides, and associated changes in local chemical composition, phase composition, and a level of residual stresses beneath the surface. CONCLUSIONS: The developed process can substitute the time and money-consuming carbonization of titanium and its alloys.
