evaluations, and projects; hydrogen production, purification, liquefaction, and marketing; and industrial gases economic evaluations and project cost estimates.

Igor Sekachev is group leader of the Vacuum Systems and Cryogenic Engineering Group at TRIUMF, Canada’s National Laboratory for Particle and Nuclear Physics. In this capacity, Mr. Sekachev works with helium storage, use, and distribution for a large science research facility and brings expertise in cryogenics engineering. Mr. Sekachev has over 20 years of engineering physics experience in vacuum, cryogenics, and mechanical, electrical, and electromechanical instrumentation design and construction. He is familiar with the commissioning, operation, and maintenance procedures for equipment and instrumentation used in nuclear and particle physics, accelerators, and industrial installations. He also has extensive international contacts in cryogenics in the United States, Europe, and Asia. He has an M.Sc. in engineering physics from Moscow Engineering Physics Institute (a university).

Thomas A. Siewert leads the Structural Materials Group in the Materials Reliability Division of the National Institute of Standards and Technology. He received his Ph.D. in metallurgy from the University of Wisconsin (following earlier degrees in applied math and physics, and materials science), spent about 10 years as an electrode developer in the welding industry, and currently has more than 20 years of government service as a researcher. Dr. Siewert is a fellow and honorary member of the American Welding Society and past chair of the American Council of the International Institute of Welding. He is an adjunct professor in the Center for Welding and Joining Research at the Colorado School of Mines, teaches several courses a year in material forensics for OSHA inspectors, and is a coeditor of the ASM Handbook on Welding.

Mark H. Thiemens (NAS) is a professor of chemistry and biochemistry and dean of the Division of Physical Sciences at the University of California at San Diego. He developed the mass-independent fractionation process for stable isotopes and used the process to gain a deeper understanding of Earth’s atmospheric composition and evolution. A portion of his work involves understanding the quantum-level physical and chemical mechanisms of the process. He has also used this process to study a wide array of phenomena, including the origin and evolution of the solar system; the source and transformation of greenhouse gases in the troposphere; the chemistry of the stratosphere and mesosphere, especially the ozone cycle; the chemistry of the ancient martian atmosphere; the origin and evolution of oxygen and ozone and life in Earth’s Precambrian; the history of seawater over millions of years; and changes in the oxidative capacity of the atmosphere.

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