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Magnetic Particle Recovery of Serial Numbers

Description: One method used by crime labs to recover obliterated serial numbers in steel firearms (ferrous samples) is the magnetic particle technique. The use of this method is predicated on the detection of metal deformation present under stamped serial numbers after the visible stamp has been removed. Equipment specialized for this detection is not used in these attempts; a portable magnetic yoke used typically for flaw detection on large weldments or structures, along with dry visible magnetic powders,… more
Date: October 1, 2003
Creator: Utrata, D. & Johnson, M.J.
Partner: UNT Libraries Government Documents Department
open access

Latent interface traps and 1/f noise in irradiated MOS devices

Description: A delayed increase in 1/f noise is observed for pMOS transistors showing latent radiation-induced interface-trap buildup. The latent interface traps and increased noise appear to result from the same thermally activated process, likely involving hydrogen.
Date: June 1, 1997
Creator: Fleetwood, D.M. & Johnson, M.J.
Partner: UNT Libraries Government Documents Department
open access

Study of the potential use of carburized niobium in plutonium processing

Description: Carburized refractory metals, especially tantalum, have been shown to possess properties useful for application as hardware in the plutonium-processing environment. These applications are driven in part by a desire to minimize the production of radioactively contaminated waste. The current use of ceramics as containment materials for Pu processing are not ideal due to the short service life of the hardware, placing an additional burden on the contaminated waste stream. Carburized niobium has be… more
Date: December 1, 1998
Creator: Johnson, M.J.; Soderquist, S.D. & Axler, K.M.
Partner: UNT Libraries Government Documents Department
open access

Design of the FRIB Cryomodule

Description: An advanced, modular bottom-supported cryomodule design is described which is highly optimized for mass-production and efficient precision-assembly. The FRIB driver linac uses 4 types of superconducting resonators and 2 solenoid lengths which in turn require 7 individual cryomodule configurations. To meet alignment tolerances a precision-machined bolted cryomodule rail system is described. A novel, kinematic mounting system of the cold mass is introduced which allows for thermal contractions wh… more
Date: July 1, 2012
Creator: Johnson, M. J.; Binkowski, J.; Bricker, S.; Casagrande, F.; Fox, A. D.; Lang, B. R. et al.
Partner: UNT Libraries Government Documents Department
open access

Superconducting Resonators Development for the FRIB and ReA Linacs at MSU: Recent Achievements and Future Goals

Description: The superconducting driver and post-accelerator linacs of the FRIB project, the large scale radioactive beam facility under construction at MSU, require the construction of about 400 low-{beta} Quarter-wave (QWR) and Half-wave resonators (HWR) with four different optimum velocities. 1st and 2nd generation prototypes of {beta}{sub 0} = 0.041 and 0.085 QWRs and {beta}{sub 0} = 0.53 HWRs have been built and tested, and have more than fulfilled the FRIB and ReA design goals. The present cavity surf… more
Date: July 1, 2012
Creator: Facco, A.; Binkowski, J.; Compton, C.; Crisp, J. L.; Dubbs, L. J.; Elliot, K. et al.
Partner: UNT Libraries Government Documents Department
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