Study of stress corrosion in aluminum alloys

Mechanism of the stress corrosion cracking of high-strength aluminum alloys was investigated using electrochemical, mechanical, and electron microscopic techniques. The feasibility of detecting stress corrosion damage in fabricated aluminum alloy parts by nondestructive testing was investigated using ultrasonic surface waves and eddy currents

Increased resistance to stress corrosion of aluminum alloys

Stress corrosion resistance is increased by distorting surface grain-boundary structure and by interrupting the corrosion and stress corrosion. The first is accomplished by machining or shot peening and the second by removal from and later reexposure to the corrosive environment

Feasibility study for a secondary Na/S battery

The feasibility of a moderate temperature Na battery was studied. This battery is to operate at a temperature in the range of 100-150 C. Two kinds of cathode were investigated: (1) a soluble S cathode consisting of a solution of Na2Sn in an organic solvent and (2) an insoluble S cathode consisting of a transition metal dichalcogenide in contact with a Na(+)ion conducting electrolyte. Four amide solvents, dimethyl acetamide, diethyl acetamide, N-methyl acetamide and acetamide, were investigated as possible solvents for the soluble S cathode. Results of stability and electrochemical studies using these solvents are presented. The dialkyl substituted amides were found to be superior. Although the alcohol 1,3-cyclohexanediol was found to be stable in the presence of Na2Sn at 130 C, its Na2Sn solutions did not appear to have suitable electrochemical properties

DETERMINANTS OF ARGENTINEAN WINE PRICES IN THE U.S. MARKET

A hedonic price function for Argentinean wines in the U.S market is estimated in order to evaluate the effect of the most important attributes of wine on price. Results show that labeling practices and the choice of the right wine quality attributes are far more influential on price than expert panel opinions or oenological wine improvements such as aging.wine prices, Argentinean wine, hedonic price model, Demand and Price Analysis,

Study of the general mechanism of stress corrosion of aluminum alloys and development of techniques for its detection Quarterly report, 1 May - 31 Aug. 1968

Mechanism of stress corrosion cracking in aluminum alloys and techniques for detection of surface defect

Study of the general mechanism of stress corrosion of aluminum alloys and development of techniques for its detection Quarterly report, 1 Dec. 1967 - 29 Feb. 1968

Stress corrosion of aluminum alloys and techniques for its detectio

Study of the general mechanism of stress corrosion of aluminum alloys and development of techniques for its detection Annual summary report, 2 Jun. 1967 - 1 Jun. 1968

Stress corrosion cracking of high strength aluminum alloys investigated by electrochemical, mechanical, and electron microscopic technique

Does export market concentration matter? A case study of uruguayan beef exports

70 p.As one of the 10 main world beef exporters, Uruguay with a relatively big beef industry, exports 80% of its total beef production. Even though beef production has always been a relevant sector in the Uruguayan economy, during the last 8 years strong growth in exports caused Uruguay to become competitive in the world beef market. Strong investment by the country’s beef industry significantly increased the harvest and processing capacity. Cattle harvesting records were set in 2005 and 2006. The export destinations of Uruguayan beef have been changing drastically during the last 8 years. The outbreak of FMD (Foot and Mouth Disease) in 2001 with the consequent closing of traditional markets, has determined new trade patterns and a different export destination mix. During 2005, 72% of the beef exports had the United States as destination, increasing the fear of dependence in one country. If a Geographic Diversification Index is calculated among the main world beef exporters, the results show that in 2005 the structure of the Uruguayan beef exports is the most concentrated among them. The described scenario constitutes a start at evaluating the actual Uruguayan export mix. This study aims to discuss whether the actual export market concentration makes Uruguay vulnerable and constitutes an economic problem and whether the government can, and should, attempt to diversify trade for economic reasons. The main research questions that emerge from the above situation and that guide the study are the following: 1. Should Uruguay follow its neighbours and also try to diversify? Or, should Uruguay continue to nurture the US and its growing demand? 2. Is it risky to have most of the eggs in one basket? Does it mean the export revenue is not stable and not growing? 3. Does concentration imply more export volume and revenue volatility than if Uruguay had a smaller share of its beef trade with the US? Will a diversification strategy of exports make Uruguay better off? 4. Who and what determine the trade patterns? Is it even feasible for the government to change the Uruguayan share of beef trade with the US? The paper is structured in three main sections besides the conclusions, references and appendix. The first section introduces the reader to the country giving a brief overview of the beef sector, emphasizing the beef industry characteristics as well as its domestic and export markets. The second part describes what is meant by diversification, and the reasons why it is so important. Then, the section exposes what has determined Uruguayan beef market structure and trade patterns to date, and an approximation of a possible future scenario for Uruguayan exports to the US is analyzed. Since geographic diversification is the main concern, the third section focuses on that preoccupation and assesses whether the current state of affairs is problematic from an economic point of view. To systematically describe the current trade mix and consider if it is problematic or too volatile, the concept of return versus risk in investment portfolios is applied to country trade portfolios. Export growth and export revenue are used as measures of return and export volatility as a measure of risk. Due to the fact that this analogy is not a perfect fit, one should not view this framework as providing a definitive answer about Uruguay’s optimal geographic export mix. Instead, it is a starting point to describe and assess the tradeoffs between trad

Controlling Silver Nanoparticle Size and Morphology with Photostimulated Synthesis

Photo-induced synthesis and control over the size and shape of colloidal silver nanoparticles is investigated in contrast to photo-stimulated aggregation of small nanoparticles into large fractal-type structures. The feasibility of light-driven nanoengineering which enables manipulation of the sizes and shapes of the isolated nanoparticles is studied by varying the amount and type of the stabilizing agent and the type of optical irradiation.Comment: 10 pages, 7 figures, 11 image