Dry sliding wear of active screen plasma carburised austenitic stainless steel

Low temperature diffusion treatments with nitrogen and carbon have been widely used to increase the tribological performance of austenitic stainless steels. These processes produce a layer of supersaturated austenite, usually called expanded austenite or S-phase, which exhibits good corrosion and wear resistance. The novel active screen technology is said to provide benefits over the conventional DC plasma technology. The improvements result from the reduction in the electric potential applied to the treated components, and the elimination of such defects and processing instabilities as edge effects, hollow cathode effects and arcing. In this study, AISI 316 coupon samples were plasma carburised in DC and active screen plasma furnaces. The respective layers of carbon expanded austenite were characterised and their tribological performance was studied and compared. Detailed post-test examinations included SEM observations of the wear tracks and of the wear debris, EDX mapping of the wear track, EBSD crystal orientation mapping of the cross sections of the wear tracks, and cross-sectional TEM. Based on the results of wear tests and post-test examinations, the wear mechanisms involved are discussed.

Study of active screen plasma processing conditions for carburising and nitriding austenitic stainless steel

Active screen (AS) is an advanced technology for plasma surface engineering, which offers some advantages over conventional direct current (DC) plasma treatments. Such surface defects and process instabilities as arcing, edge and hollow cathode effects can be minimised or completely eliminated by the AS technique, with consequent improvements in surface quality and material properties. However, the lack of information and thorough understanding of the process mechanisms generate scepticism in industrial practitioners. In this project, AISI 316 specimens were plasma carburised and plasma nitrided at low temperature in AS and DC furnaces, and the treated samples were comparatively analysed. Two diagnostic techniques were used to study the plasma: optical fibre assisted optical emission spectroscopy, and a planar electrostatic probe. Optimum windows of treatment conditions for AS plasma nitriding and AS plasma carburising of austenitic stainless steel were identified and some evidence was obtained on the working principles of AS furnaces. These include the sputtering of material from the cathodic mesh and its deposition on the worktable, the generation of additional active species, and the electrostatic confinement of the plasma within the operative volume of the furnace.

Manifesto of a defeated poet

This feature-length experimental film is the result of an intimate collaboration between Bosnian filmmaker/poet/painter/musician/performace artist Saidin Salkic (On Karasevdah: Srebrenica Blues, 2007 & Konvent 2010) and veteran Australian experimental filmmaker and film educator John Cumming (Obsession, Recognition & Sabotage 1985-87, First time Tragedy Second Tome Farce, 1989, The Hollow Centre 1999). Created over a period of four years it draws on the traditions and possibilities of improvisation – in cinematography, experimental cinema, dance, music and performance – with moments of intensity and repose, fluidity and halting re-composure. Cumming’s camera and Salkic’s movement work in front of it are at once expressionistic and in dialectical tension as are Salkic’s poetry, his haunting improvisations on piano and melodica and Cumming’s industrial soundscapes. SYNOPSIS: In the midst of fascist-capitalist madness, the Foreigner (a poet/dancer with sun on his palms and blood from his dreams on his face) hovers in neon twilight with last whispers of sanity on his lips, guarding and protecting the world – forever. REVIEW: ‘Full of mystery and beauty, punctuated by strange eruptions of silent cinema, of Chaplin, of film history made personal … not the film of a dance but a dance itself around pure presence … something unique and precious.’ Maximilian Le Cain, http://lecain.blogspot.com.au/2015/11/a-few-reflections-on-manifesto-of.html

FAST-E en Pacientes con Trauma Abdominal Cerrado Estable, en un Departamento de Urgencias en Colombia

El impacto que ha generado el trauma en Colombia a lo largo de la historia, nos ha obligado a mejorar y adaptar diferentes tipos de sistemas de atención en trauma, basados en los lineamientos internacionales, los cuales buscan evitar el significativo aumento en las tasas de mortalidad y discapacidad que se obtienen de este, especialmente en los servicios de Emergencias en los cuales se reciben el 100% de estos pacientes con traumatismo múltiple o politraumatismo. Dentro de este grupo de pacientes hay un subgrupo que son las pacientes con trauma de abdomen que cursan con estabilidad hemodinámica y además son clasificados de bajo riesgo, ya sea por índices de trauma o por otros métodos como la medición sérica de lactato, los cuales tienen un papel poco despreciable al momento de ver mortalidad y discapacidad por trauma, ya sea penetrante o cerrado; en este trabajo específicamente nos centramos en las personas que consultan al servicio de Emergencias con trauma cerrado de abdomen los cuales son considerados de bajo riesgo, siendo este subgrupo de pacientes uno de los más difíciles de abordar y enfocar al momento de la valoración inicial, ya que se debe tener la seguridad de que no hay lesiones que comprometen la vida y por consiguiente estos pacientes puedan ser dados de alta.