Neutrons from 9Be/alpha,n/ reaction for E alpha between 6 and 10 MeV

Neutron energy spectra measured as function of neutron emission angle and ion bombardment energ

Maintaining the Environmental–Racial Order in Northern New Mexico

The environmental - racial order in northern New Mexico is maintained through a process of racial triangulation in which Anglos, Native Americans, and Hispanos are valued relative to one another along axes of environmental stewardship and victimization (Kim C J, 1999, "The racial triangulation of Asian Americans" Politics and Society 27 105 - 138). Both axes involve the juxtaposing of three long-standing images: (1) Spanish injustices to the Indians; (2) the inability of Mexicans to manage their land properly; and (3) Indians being preeminent environmental stewards. In contrast to Kim's formulation of racial triangulation, however, the axes also involve imagery that contradicts these images: the debauched, poverty-stricken Indian; and European culture as a despoiler of the environment. Also in contrast to Kim's formulation, racial triangulation can involve the creation of new identities. In the 1960s Hispano activists began claiming to be heirs to a hybrid culture that included elements of both Native American and Spanish cultures. While this claim to hybridity enabled the creation of new oppositional discourses, the reconciling of contradictory imagery by historicizing the discourses and by other means undermines the new Hispano oppositional discourses as well as Hispano identity itself Racial triangulation is thus a fluid and contested process in which identity formation and the interchange between predominant and oppositional discourses are constitutive of power relations. Contradictory imagery in the discourse facilitates the maintenance of the environmental - racial order, even as it enables subordinates to challenge their racialized positions and to effect change in the distribution of material wealth, rights, and privileges

Upgrading of nuclear instrumentation on 42 inch gasifier: an evaluation report

At the risk of a complicated offering, four options have been presented for the sake of covering the range that extends from a lower priced option (1A) to a high performance option (2B). Option 2B is unqualifiedly recommended for providing the most complete Producer data and the fastest and most accurate response. These density and level data can be fully utilized when computerized control and the faster (future hydraulic) rabble arm action are introduced, which will greatly facilitate achieving the desired modes of Producer operation for long range studies of both the production and the off-gas treatment processes. Option 2B is rated as the most reliable on the grounds that the largest number of crystals and photomultiplier tubes are used: similar units have been basically operational for about seven years at MERC. The ionization chambers, having intrinsically infinite lifetime, have not been used at MERC. However, these are also expected to have a high overall reliability. They are utilized in Options 1B and 2B. Not only their lifetime, but their capability of operating with a lower gamma ray total field strength and with a lower change in field strength (as is required on the coal chutes and ash hoppers) make them far superior for operation as level gauges over a seven year service period. They are also much faster than GM tubes, which will reduce the probability that the level gauges (with ion chambers) will limit the control capabilities of the Producer

Neutron transport measurements and source monitor development for uranium borehole logging sonde. Final report

The first part discusses the design and results of a /sup 252/Cf-neutron and a 14-MeV neutron benchmark experiment for verifying previously developed theoretical methods for use in the design of a neutron logging tool for uranium borehole exploration. The second part discusses the Science Applications, Inc. (SAI) development of a fast fission monitor for measuring 14-MeV neutrons for a D-T borehole sonde in a high neutron moderating and absorbing environment. The 14-MeV pulsed neutron monitor was used in carrying out the 14-MeV neutron benchmark experiment, and a variation on the method of quantitatively counting many events in one burst of pileup counts, developed for the 14-MeV-pulsed neutron monitor, was employed in successfully counting the epithermal neutrons produced by a short (2 ..mu..s) burst of 14-MeV neutrons. Thus, the development of the 14-MeV-neutron monitor and the measurements with 14-MeV neutrons were intimately related