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27 results on '"Caulder, S. M."'

5. NQR Line Broadening Due to Crystal Lattice Imperfections and Its Relationship to Shock Sensitivity.

Author

Caulder, S. M., Buess, M. L., Garroway, A. N., and Miller, P. J.

Subjects
*HYDRODYNAMICS, *EXPLOSIVES, *MECHANICAL shock, *CRYSTALS, *NUCLEAR quadrupole resonance spectroscopy, *PHYSICS
Abstract

The hydrodynamic hot spot model is used to explain the difference between shock sensitive and shock insensitive explosives. Among the major factors that influence the shock sensitivity of energetic compounds are the quality and particle size of the energetic crystals used to formulate the cast plastic bonded explosive. As do all energetic compounds, RDX and HMX exhibit internal crystal defects the magnitude and type of which depend on the manufacturing process used to synthesize and re-crystallize the energetic compound. Nuclear Quadrupole Resonance (NQR) spectroscopy was used to determine the crystal quality of RDX, HMX and CL-20 obtained from various manufacturers. The NQR experimental results are discussed. Cast plastic bonded explosives were made using the RDX and HMX obtained from the various manufacturers and subsequently subjected to the NOL large-scale gap test (LSGT). The results of the LSGT are discussed and correlated with the NQR results. A relationship between the crystal defect density and shock initiation pressure of the plastic bonded explosive is developed and discussed. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2004
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7. Research on Lead Acid Battery Electrodes.

Author

NAVAL RESEARCH LAB WASHINGTON DC, Simon,A C, Caulder,S M, Wales,C P, Jones,R L, NAVAL RESEARCH LAB WASHINGTON DC, Simon,A C, Caulder,S M, Wales,C P, and Jones,R L

Abstract

The reactions and physical and molecular transformations that occur in lead acid battery plate active material during charge-discharge cycling have been studied under a DOE program to improve the lead acid battery for electric vehicle applications. Investigations included structural studies of PbO2 by x-ray/neutron diffraction, effects of cycling on capacity by pulsed vs unpulsed discharge, active material microstructure/plate capacity changes under high EV-type discharge rates, 'coralloid' structure formation in cycled positive plates, and tubular plate active material changes during formation and cycling. (Author)

Published
1982

8. Improvements in the Lead-Acid Battery for Load Leveling Applications. FY78 Summary Report.

Author

NAVAL RESEARCH LAB WASHINGTON DC, Simon,A C, Caulder,S M, Wales,C P, Jones,R L, NAVAL RESEARCH LAB WASHINGTON DC, Simon,A C, Caulder,S M, Wales,C P, and Jones,R L

Abstract

This report describes research conducted in FY78 under a DoE program to improve the lead-acid battery system for load leveling at electricity-generating plants. The study has identified changes in the plate active material that occur during cycling (or service operation), viz, a progressive buildup of an electrochemically inactive PbO2 species, and the physical transformation of the active material to a styructurally unfavorable coralloid form, which, if eliminated, could improve batttery performance. (Author)

Published
1979

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