Recent developments of the Laser-assisted Cold Spray process and deposit characterisation

Laser-assisted Cold Spray (LCS) is a new coating and fabrication process which combines the supersonic powder beam found in Cold Spray (CS) with laser heating of the deposition zone. LCS retains the advantages of CS; solid-state deposition, high build rate and the ability to deposit onto a range of substrates, while reducing operating costs by removing the need to use gas heating and helium as the process gas. Recent improvements in powder delivery and laser energy coupling to workpiece have been undertaken to improve deposition efficiency (DE) and build rate, while real-time temperature logging allows greater management of deposition conditions and deposit characteristics.

Parameter studies of fibre laser micro-welding of AISI 316L using Taguchi method

This paper discusses the application of the Taguchi experimental design approach in optimizing the key process parameters for micro-welding of thin AISI 316L foil using the 100W CW fibre laser. A L16 Taguchi experiment was conducted to systematically understand how the power, scanning velocity, focus position, gas flow rate and type of shielding gas affect the bead dimensions. The welds produced in the L16 Taguchi experiment was mainly of austenite cellular-dendrite structure with an average grain size of 5µm. An exact penetration weld with the largest penetration to fusion width ratio was obtained. Among those process parameters, the interaction between power and scanning velocity presented the strongest effect to the penetration to fusion width ratio and the power was found to be the predominantly important factor that drives the interaction with other factors to appreciably affect the bead dimensions.

An Experimental Investigation into the Effects of Flanged Holes in Hat-Stiffened Panels Loaded in Uniaxial Compression

The effects of a 100 mm diameter integrally-flanged hole in a hat-stiffenend carbon-fibre composite panel, loaded in uniaxial compression, were investigated and compared with a similar panel containing an unflanged hole. Details of the manufacturing techniques used in the production of the integral flange are presented. The stiffening effects of the flange reduced the bending strains, which may lead to high interlaminar shear strains, around the cutout while increasing the membrane strains. These membrane strains were well below the limit strains for this composite material. The skin in the unflanged hole also underwent a change in buckling mode shape from three longitudinal half-wavelengths to five half-wavelengths. No such change was observed in the flanged panel and this buckled in four longitudinal half-wavelengths. The ultimate strength of both panels was determined by the load carrying capability of the stiffeners.

The art of Treasure Island /

"Corrigenda": 1 leaf laid in.

Costa Rica: the gem of American republics. The land, its resources and its people.

Prepared for the Cotton states and international exposition, Atlanta, 1895.

Century-of-progress fair at Chicago in 1933 : hearing before the Committee on the Library, House of Representatives, Seventy-first Congress, third session, on H.J. Res. 448, providing for the participation of the United States in a century of progress (at the Chicago World's Fair centennial celebration) to be held at Chicago, Illinois, in 1933, authorizing appropriation therefor, and for other purposes. January 15, 1931.

Mode of access: Internet.

Intereses nacionales convergentes en una apuesta colectiva: la alianza del pacífico

Este documento indaga sobre los determinantes que hicieron posible la creación de la Alianza del Pacífico. Para ello, se describen elementos del contexto internacional y regional dentro del cual se gestó la Alianza, y que permitió la convergencia de unos intereses afines entre Chile, Colombia, Perú y México que, determinados por identidades similares, desembocaron en un proyecto colectivo: La Alianza del Pacífico. El argumento principal es que los intereses, las características y las identidades comunes configuraron unas preferencias nacionales que fueron materializadas en la creación de un proyecto de integración económica con características particulares, que sirve de plataforma para la coordinación, la articulación, la inserción y el desarrollo económico de sus miembros.

Coverage of international and Pacific news in the Fiji Times and The Australian

The debate over the nature and flow of international news has dominated intellectual debate about journalism practice for some time. Developing countries argued there was an imbalance in the nature and amount of international news concerning them. They argued that the Western media rarely reported on developing countries and when they did, reported predominantly negative news about developing countries. The debate led to calls for a New World Information and Communication Order (NWICO). A number of studies examined its arguments, many finding developing countries were indeed disadvantaged by the Western media. This study compared foreign news coverage in The Australian and The Fiji Times, with special attention on news from the Pacific Islands region. It found the coverage of the Pacific Islands was still grossly inadequate in both newspapers. The coverage consisted of only a small number of stories, which were predominantly negative, surprising especially in the case of The Fiji Times.