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the Entire April 2002 Issue in PDF (7.7MB)
Quantum Simulations Tell the Atomic-Level Story
(pdf
file, 3MB)
Simulations of quantum molecular dynamics make it possible for the first
time to get an accurate look at what happens to individual atoms and molecules
during the course of a high-pressure experiment. Such simulations are
supplying some of the first information about deceptively simple materials
such as water and hydrogen. Recent simulations of shocked liquid hydrogen,
the largest ab initio simulations to date on the ASCI White computers,
sought to locate reasons for differences found during two sets of high-pressure
experiments on deuterium. Other simulations examined water at ambient
conditions and under static pressures up to 30 gigapascals. While water
molecules dissociate just once every 11 hours at ambient pressures and
temperatures, dissociation occurs once every billionth of a second at
30 gigapascals. The same dissociation process occurs under both sets of
conditions: two water molecules become hydroxide and hydronium. The smallest
part of the DNA backbone has also been modeled, as have a mustard-based
drug for treating cancer and silicon quantum dots that may be used in
biosensors to detect chemical warfare agents.
Forensic Science Center Maximizes the Tiniest Clue
(pdf
file, 3.6MB)
Founded in 1991, the Laboratorys Forensic Science Center (FSC)
offers a comprehensive range of analytical expertise to counter terrorism,
aid domestic law enforcement, and verify compliance with international
treaties and agreements. The center is among the best of its kind for
collecting and analyzing virtually any kind of evidence, some of it no
larger than a few billionths of a gram. The centers approach to
forensic analysis maximizes the information that can be obtained from
extremely small samples of explosives residue, dust particles, hair strands,
blood stains, radioactive isotopes, drugs, chemicals, and clothing fibers.
Many projects have required FSC scientists to develop new analytical tools
and forensic techniques as well as unique sampling procedures. Several
new portable instruments have been developed for analysis in the field.
FSC has also played a pivotal role in several well-publicized criminal
investigations.
Bright Future for Compact Tactical Laser Weapons
(pdf
file, 2MB)
Compact
solid-state laser technology developed at Livermore makes possible the
mobile, tactical weapon of the future.
Engineeerings Tradition Turns Ideas into Reality
(pdf
file, 3MB)
Since
the beginning, engineers have developed innovative technologies to fulfill
the specialized requirements of the Laboratorys programs.
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