Computer modeling of the mineralogy of the Martian surface, as modified by aqueous alteration

Mineralogical constraints can be placed on the Martian surface by assuming chemical equilibria among the surface rocks, atmosphere and hypothesized percolating groundwater. A study was made of possible Martian surface mineralogy, as modified by the action of aqueous alteration, using the EQ3/6 computer codes. These codes calculate gas fugacities, aqueous speciation, ionic strength, pH, Eh and concentration and degree of mineral saturation for complex aqueous systems. Thus, these codes are also able to consider mineralogical solid solutions. These codes are able to predict the likely alteration phases which will occur as the result of weathering on the Martian surface. Knowledge of the stability conditions of these phases will then assist in the definition of the specifications for the sample canister of the proposed Martian sample return mission. The model and its results are discussed

Leadership and Upward Influence: A Survey of Business School Deans

J. Michael McDonald, Ph.D., is director of Graduate Studies, College of Business Administration, Georgia Southern University, Statesboro, Ga 30460-8050. Carl W. Gooding, Ph.D., is professor of management, College of Business, Jacksonville State University, Anniston, AL. 36205

Rabbits in the Karri country - Some Recollections of 30 years of Vermin Control in the Lower J South-West

Rabbits first made their appearance in various parts of the Manjimup Road Board District during 1925 and 1926. By 1928, the early arrivals appeared to have consolidated their position and increased rapidly. The areas where rabbits first appeared in serious numbers were Group 119 in the Quinninup area, Groups 123 and 117 at Northcliffe, and Groups 65 and 26 in the Eastbrook, Pemberton and Channeberrup areas. Middlesex and West Manjimup districts were also becoming: infested

Dynamical properties of the single--hole tt--JJ model on a 32--site square lattice

We present results of an exact diagonalization calculation of the spectral function $A(\bf k, \omega)$ for a single hole described by the $t$--$J$ model propagating on a 32--site square cluster. The minimum energy state is found at a crystal momentum ${\bf k} = ({\pi\over 2}, {\pi\over 2})$, consistent with theory, and our measured dispersion relation agrees well with that determined using the self--consistent Born approximation. In contrast to smaller cluster studies, our spectra show no evidence of string resonances. We also make a qualitative comparison of the variation of the spectral weight in various regions of the first Brillouin zone with recent ARPES data.Comment: 10 pages, 5 postscript figures include