Alumina bearing in gas-lubricated gyros

Friction and wear properties of alumina bearings for use in gas-lubricated gyroscope

Phase Transitions in Multicomponent String Model

We propose a one-dimensional model of a string decorated with adhesion molecules (stickers) to mimic multicomponent membranes in restricted geometries. The string is bounded by two parallel walls and it interacts with one of them by short range attractive forces while the stickers are attracted by the other wall. The exact solution of the model in the case of infinite wall separation predicts both continuous and discontinuous transitions between phases characterised by low and high concentration of stickers on the string. Our model exhibits also coexistence of these two phases, similarly to models of multicomponent membranes.Comment: letter, 8 pages, 3 figure

Adsorption studies of phenol using activated carbon prepared from groundnut shell

Due to the rapid urbanization and increasing world population, the need for fresh, clean and uncontaminated water has become a problem of great importance since many sources have been exhausted and others are likely to be contaminated. Phenol is very toxic substance even at low concentration. The major industries that discharge phenolic wastewater include petroleum refineries, petrochemicals, textile, dye manufacturing, phenolic resin manufacturing, glass fiber units, varnish industries and smelting related to metallurgical operations. Activated carbons are the most widely used adsorbents due to their excellent adsorption abilities for organic pollutants. In the present study, Activated carbons were prepared from biomass by chemical activation, using Na2CO3 as a chemical agent for our research work preparation of activated carbon from biomass i.e. peanut shell. The effects of different parameters, such as chemical/biomass ratio, activation time and activation temperature, weight loss, proximate analysis, TGA, FTIR and iodine number of the produced activated carbons will be studied. The adsorption capacity of the activated carbons was evaluated through phenol adsorption and adsorption isotherms were plotted. . It was found that yield % decreased with increase in both temperature and concentration of acid. It was found that the ACs prepared at 700 °C temperature and 100 % impregnation ratio had highest no of microporosity, which was determined by iodine number. The iodine number of the sample was 543.4 mg/g. In the phenol adsorption experiment the increase in dosage showed increased phenol removal efficiency and with increase in phenol concentration the decrease in removal efficiency, but with increase in phenol concentration decreased the phenol removal efficiency. Langmuir and Freundlich isotherms plot were drawn from equilibrium isotherm data. The Freundlich isotherm was much better fit than the Langmuir isotherm

South Dakota Beef Producer Marketing Alternatives

The general objective of the research presented in this thesis was to determine if differences in prices exist among several marketing alternatives available to beef producers. Beef producers are divided into two categories; feeders of beef for slaughter, and producers of feeder claves. The marketing alternatives analyzed are terminal market, direct buyers, auction sale barns and futures market. Specific objectives were: 1. To collect and analyze price data for slaughter cattle from the Sioux Falls terminal market, direct buyers, and futures contracts for a ten year period, 1973-1982, and determine if price differences existed between the three alternatives. 2. To collect and analyze price data for feeder cattle from the terminal market, futures contracts, and local auction barns for a five year period, 1978-1982, and determine if price differences existed between the three marketing alternatives

A multiprocessor implementation of a contextual image processing algorithm

There are no author-identified significant results in this report

Contextual classification of multispectral image data

There are no author-identified significant results in this report