During the Manhattan Project, a simple formula was developed by Bethe and Feynman in 1943 to estimate yield of fission-only nuclear explosion uniformly dense bare sphere supercritical fissile material. We have not found any evidence that knew first obtained Frisch Peierls contained within their famous March 1940 memorandum. Similarly, we technical documents compare Bethe-Feynman earlier works o...

We consider the problem of when a symbolic dynamical system supports Borel probability measure that is invariant under every element its automorphism group. It follows readily from classical result Parry full shift on finitely many symbols, and more generally any mixing subshift finite type, such measure. Frisch Tamuz recently dubbed measures characteristic, further showed zero entropy has char...

their prominence can be hard for even a casual observer to overlook. Animal signals therefore raise many scientific questions: What are their functions? What information do they transmit? How are they produced? And why did they evolve? Pioneering empirical work on animal signals was carried out by Karl von Frisch, Konrad Lorenz, and Niko Tinbergen, three ethologists who were awarded the Nobel P...

According to modern developments in turbulence theory, the ”dissipation” scales (u.v. cut-offs) η form a random field related to velocity increments δηu. In this work we, using Mellin’s transform combined with the Gaussain large -scale boundary condition, calculate probability densities (PDFs) of velocity increments P (δru, r) and the PDF of the dissipation scales Q(η,Re), where Re is the large...

Cells closely resembling epithelia constitute the first specific cell type in a mammalian embryo. Many other cell types emerge via epithelial-mesenchymal differentiation. The transcription factors and signal transduction pathways involved in this differentiation are being elucidated. I have previously reported (Frisch, 1991) that adenovirus E1a is a tumor suppressor gene in certain human cell l...

According to modern developments in turbulence theory, the ”dissipation” scales (u.v. cut-offs) η form a random field related to velocity increments δηu. In this work we, using Mellin’s transform combined with the Gaussain large -scale boundary condition, calculate probability densities (PDFs) of velocity increments P (δru, r) and the PDF of the dissipation scales Q(η,Re), where Re is the large...

We provide new evidence on the the cyclical behavior of household size in the United States from 1979 to 2010. During economic downturns, people live in larger households. This is mostly, but not entirely, driven by young people moving into or delaying departure from the parental home. We assess the importance of these cyclical movements for aggregate labor supply by building a model of endogen...