7,823 research outputs found
Richard J. Pollak, 95
No full textRichard Pollak, a World War II veteran and an aeronautical and aerospace engineer from Los Altos, has died. He was 95. Pollak, who died on Nov. 16, was born in Milwaukee to Lillian Friedlander Pollak and Joseph Pollak. During World War II he served in the U.S. Air Force in Burma and India as an engineer-gunner on B-25 bombers, flying 59 combat missions and receiving the Distinguished Flying Cross. Pollak became an aeronautical and aerospace engineer after studying at Caltech and the University of Michigan. In the 1950s, he participated in pioneering work on "fly-by-wire" control systems for jet aircraft, working at Honeywell in Minneapolis and Northrup in Southern California. Pollak, who moved to Palo Alto in 1957, worked for most of his career at Lockheed in Sunnyvale on satellite systems until his retirement in 1992
Pollak prize essays criticisms of Profits, a book by William Trufant Foster and Waddill Catchings
No full textAHC interview with Herta Pollak.
No full textHerta Pollak (nee Biss) was born in Vienna in 1914. She was riased in the third Viennese district where she went to elementary school. Then she went to high school, the "Realgymnasium", in the second district. She was a member of "Naturfreunde". She worked for "Vienna Film". After the Nazis' rise to power, she fled to England and then emigrated to the US. She deceased in Hopatcong, Sussex, New Jersey, in 2004.Austrian Heritage CollectionSee also Herta Pollak Collection (AR 10838
Semiclassical reaction rate constant calculations: investigation of anharmonicity and quantum effects
No full textSemiclassical transition state theory (SCTST) is a relatively simple method for the computation from first principles of reactive rate constants, including quantum effects while accounting for anharmonicity and the coupling between reactive and bound modes.[1-3] In this talk, I will illustrate how we have developed this technique for practical applications[4-7] involving the study of phenomena like kinetic isotope effects, heavy atom tunneling, and elusive conformer lifetimes.[5,6,8]
While many approximate reaction rate theories reduce to the parabolic barrier estimate for the tunneling correction at high temperatures, SCTST, which is based on vibrational perturbation theory (VPT2), gives the exact limit when one considers the leading order term in an expansion of powers of ħ2 of the tunneling transmission coefficient.[9-11] Our investigation of molecular reactive systems assesses the importance of the non-linear corrections to the parabolic barrier estimate of the transmission coefficient. When the reaction barrier is significantly anharmonic, it is mandatory to account for non-linear corrections; otherwise, the transmission coefficient overlooks a high-temperature regime which may be dominated by quantum reflection.[12] These results highlight the importance of having a theory such as SCTST that includes the correct high-temperature limit.
[1] W.H. Miller Faraday Discuss. Chem. Soc. 62, 40 (1977).
[2] W.H. Miller J. Chem. Phys. 62, 1899 (1975)
[3] R. Hernandez et al., Chem. Phys. Lett. 214, 129 (1993).
[4] C. Aieta, F. Gabas, M. Ceotto, J. Phys. Chem. A 120, 4853 (2016).
[5] C. Aieta F. Gabas, M. Ceotto, J. Chem. Theory Comput. 15, 2142 (2019).
[6] G. Mandelli, C. Aieta, M. Ceotto J. Chem. Theory Comput. 18, 623 (2022).
[7] J.R. Barker, MultiWell-2023 software suite; University of Michigan: Ann Arbor, Michigan, USA, 2023; http://clasp-research.engin.umich.edu/multiwell/
[8] G. Mandelli, L. Corneo, C. Aieta J. Phys. Chem. Lett. 14, 9996 (2023).
[9] E. Pollak, J. Cao, Phys. Rev. A, 107, 022203 (2023).
[10] E. Pollak, S Upadhyayula J. Chem. Phys. 160, (2024).
[11] E. Pollak J. Chem. Phys. 160, 150902 (2024).
[12] C. Aieta, M. Ceotto, E. Pollak, in preparation
A Conversation with Louis H. Pollak
No full textLOUIS H. POLLAK (1922 – 2012) served as dean of the Yale Law Schoolfrom 1965 to 1970. He received an A.B. from Harvard Collegein 1943, an LL.B. from Yale Law School in 1948, and clerked forWiley Rutledge at the U.S. Supreme Court. He joined the YaleLaw School faculty in 1955. In 1974, Pollak joined the facultyat the University of Pennsylvania Law School, serving as deanfrom 1975 until 1978, when he was appointed Judge of the U.S.District Court of the Eastern District of Pennsylvania.
Pollak published widely in the area of Constitutional Law andserved on the board of the NAACP Legal Defense Fund.https://digitalcommons.law.yale.edu/ylsohs/1006/thumbnail.jp
Gary Becker's Contributions to Family and Household Economics
No full textGary Becker's influence on the economics of the family has been pervasive. His ideas have dominated research in the economics of the family, shaping the tools we use, the questions we ask, and the answers we give. The foundational assumptions of Becker's economic approach to the family -- maximizing behavior and equilibrium -- as well as such primary auxiliary assumptions as household production and interdependent preferences, are now widely accepted not only by economists but also by family sociologists, demographers, and others who study the family. Yet the interesting and provocative implications of Becker's economic approach to the family do not follow from the foundational assumptions or from the primary auxiliary assumptions. Instead they depend on contested auxiliary assumptions to which neoclassical economics has no commitment and which lack empirical support. This paper discusses the crucial role of auxiliary assumptions in Becker's analysis of the family, first in the context of preferences, then in the context of household production, and finally in the context of family or household collective choice.
From Eggs to the Stars
No full textJane Pollak is a Westport, Connecticut, artist who started her career as a high school art teacher. She has now branched out into public speaking, is the author of two books, and embraces the life of entrepreneur as a sole proprietor of her rapidly expanding business of decorating eggs. For Jane, her life path has been one of hope and unexpected personal and business achievements.</jats:p
From Eggs to the Stars
No full textInterview of artist Jane Pollak by Shawn Blau and Laurence Weinstein.
Jane Pollak is a Westport, Connecticut, artist who started her career as a high school art teacher. She has now branched out into public speaking, is the author of two books, and embraces the life of entrepreneur as a sole proprietor of her rapidly expanding business of decorating eggs. For Jane, her life path has been one of hope and unexpected personal and business achievements
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