Zobrazeno 1 - 10
of 29
pro vyhledávání: '"J. F. Poco"'
Autor:
S. J. Shin, Alex V. Hamza, Ich C. Tran, Monika M. Biener, Yinmin M. Wang, Juergen Biener, J. F. Poco, Trevor M. Willey, F. Pérez, Anthony van Buuren, Kevin B. Fournier, Stuart A. Gammon, Joe H. Satcher
Publikováno v:
ACS Applied Materials & Interfaces. 5:13129-13134
A universal approach for on-demand development of monolithic metal oxide composite bulk materials with air-like densities (5 mg/cm(3)) is reported. The materials are fabricated by atomic layer deposition of titania (TiO2) or zinc oxide (ZnO) using th
Autor:
Carlos E. Castro, R. L. Hibbard, R. J. Wallace, Nick Teslich, Harry E. Martz, Jose Milovich, Peter Amendt, Alex V. Hamza, Harry Robey, Joe H. Satcher, Bill Brown, J. F. Poco, Matthew Bono, Don Bennett
Publikováno v:
Fusion Science and Technology. 51:611-625
Indirectly driven double shell implosions are being investigated as a possible noncryogenic path to ignition on the National Ignition Facility. Lawrence Livermore National Laboratory has made several technological advances that have produced double s
Publikováno v:
Journal of Non-Crystalline Solids. 341:35-39
We report the synthesis and characterization for the first example of a low-density nanocrystalline thoria aerogel. The monolithic aerogels were prepared through the solgel polymerization of hydrated thorium nitrate in ethanol using ammonium hydroxid
Using Silica Aerogel to Characterize Hypervelocity Shrapnel Produced in High Power Laser Experiments
Autor:
Don Curran, R.E. Tokheim, J. F. Poco, D. L. Haupt, Jim Andrew, Karen Mann, Michael T. Tobin, David C. Eder, Joe H. Satcher
Publikováno v:
International Journal of Impact Engineering. 29:713-721
We present a technique using silica aerogel to characterize the number, velocity, size, and spatial distribution of shrapnel. Measuring shrapnel produced in a large laser facility can aid in improving target designs to reduce shrapnel, thereby extend
Autor:
Douglas D. Osheroff, Young S. Lee, Lidiya Polukhina, J. F. Poco, Lawrence W. Hrubesh, J. E. Baumgardner
Publikováno v:
Physica B: Condensed Matter. :292-295
Continuous wave NMR studies of superfluid 3 He in 99.4%, 98.7% and 98.3% porosity silica aerogels show similar phase diagrams, with an equal spin pairing (ESP) A-like state stable near Tc,a, and a B-like phase stable at lower temperatures. On cooling
Publikováno v:
Journal of Non-Crystalline Solids. 319:241-246
We report the synthesis and characterization for the first example of a low-density urania aerogel. The monolithic aerogels were prepared through the sol–gel polymerization of hydrated uranyl nitrate in ethanol using propylene oxide as a gelation i
Autor:
Alexander E. Gash, Randall L. Simpson, J. H. Satcher, Lawrence W. Hrubesh, J. F. Poco, Thomas M. Tillotson
Publikováno v:
Journal of Non-Crystalline Solids. 285:338-345
We have utilized a sol–gel synthetic approach in preparing nano-sized transition metal oxide components for new energetic nanocomposites. Nanocomposites of Fe 2 O 3 /Al(s), are readily produced from a solution of Fe(III) salt by adding an organic e
Publikováno v:
Journal of Non-Crystalline Solids. 285:57-63
Many non-silica aerogels are notably weak and fragile in monolithic form. In particular, few monolithic aerogels with densities less than 50 kg/m 3 have any significant strength. It is especially difficult to prepare uncracked monoliths of pure alumi
Autor:
Alexander E. Gash, Lawrence W. Hrubesh, Randall L. Simpson, J. F. Poco, Thomas M. Tillotson, Joe H. Satcher
Publikováno v:
Chemistry of Materials. 13:999-1007
Iron oxide-based porous solids were prepared by a sol−gel process using Fe(III) salts in various solvents. It was observed that the addition of propylene oxide to Fe(III) solutions resulted in the formation of transparent red-brown monolithic gels.
Autor:
Lawrence W. Hrubesh, Young S. Lee, Lidiya Polukhina, J. F. Poco, Barry I. Barker, Douglas D. Osheroff
Publikováno v:
Physical Review Letters. 85:2148-2151
New NMR studies of 3He in high-porosity aerogel reveal a phase transition from an A-like to a B-like phase on cooling. The evidence includes frequency shift and magnetic susceptibility data, and similar behavior is found in two quite different aeroge