Simple pressure gauge for uranium hexafluoride

A sensitive detector and pressure gauge for uranium hexafluoride in high‐vacuum systems is described. Negative surface ionization of UF_6 occurs on ribbon filaments operated at temperatures too low for electron emission to be significant. The ion current measured on a cylindrical collector surrounding the filament assembly varies regularly with UF_6 pressure below 10^(−3) Torr. Different filament materials are considered, including rhenium, thoriated tungsten, and platinum. Rhenium is found to be the most satisfactory material for operation of diode emitters as a pressure gauge. Gauge constants (in A Torr^(−1)) are derived from comparing negative surface ionization currents with the response of a capacitance manometer and are shown to be independent of temperature within a reasonable operating range. The effects of exposing the rhenium filament to various gases is considered, and it is shown that brief exposure to acetylene substantially improves the operating characteristics of the gauge

EFFECTS OF ALTERNATIVE ACREAGE RESTRICTION PROVISIONS ON ALABAMA COTTON FARMS

The 1985 Farm Bill departs from recent farm bills in moving toward more restrictive acreage control. The change from a two- to a five-year average in calculating base acreage and enforcement of limited cross-compliance appear to significantly alter crop mix decisions on representative Alabama cotton farms.Political Economy,

Dissociative electron attachment reactions of transition metal carbonyls and their apparent influence on the thermalization of electrons by CO2

Dissociative electron attachment rates are measured for the transition metal carbonyls V(CO)6, Cr(CO)6, Fe(CO)5, Ni(CO)4, Mo(CO)6, and W(CO)6. Rates are measured as a function of the pressure of CO2 added to relax epithermal electrons. Derived thermal rate constants for the formation of M(CO)-n-1 from M(CO)n are 0.6, 3.0, 2.0, 2.0, 1.3, and 1.2×10^−7 cm3 molecule−1 s−1, respectively. The differences in these rate constants may be attributed to the different stabilities of the molecular anion with regard to dissociation versus autodetachment. The measured rate of thermalization of electrons by CO2 varies with the metal carbonyl used and depends on the variation of the dissociative electron capture cross section with electron energy. Each system is thus tightly coupled in that the electron energy distribution is determined not only by collisional processes involving CO2 but varies as well with the energy dependent depletion of the distribution by reactant species

Destructive Leadership: The Hatfield And Mccoy Feud

This paper explores the phenomenon of destructive leadership using the historical case study of the feud between the Hatfields and McCoys. The characteristics of destructive leadership as well as the consequences of this leadership style are reviewed, examined and analyzed. Utilizing a case from history to shine light on a contemporary problem, this paper will provide insight into identifying the characteristics of destructive leadership and raise awareness for future research into this important topic

Constitutive soluble methane monooxygenase mutants of methanotrophic bacteria such as Methylosinus trichosporium A.T.C.C. 55314

Selection of mutant methanotrophic bacteria capable of efficiently degrading halogenated hydrocarbons typically found in numerous wastewater sources is described. The mutants are distinguishable from parental strains in having a unique resistance to the presence of copper while exhibiting unusually high degradation rates toward trichlorethylene. Methylosinus trichosporium A.T.C.C. 55314 strains are particularly good sources of the described mutants which may be obtained using a new method of selection and screening. The disclosed microorganisms may be immobilized on various matrices and are particularly adaptable for use in bioreactors. Further, the methanotrophic bacteria have antibiotic resistance to streptomycin or rifampicin B.Board of Regents, University of Texas Syste