Difference between heartwood and sapwood
Forest Products Laboratory (U.S.)
1919
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Nematic liquid crystal cells with polyvinyl cinnamate coated substrates were
subjected to ultraviolet light. When this was done in the presence of an oblique magnetic
field the photoalignment was found to be temporally and thermally robust, with a large
pretilt angle and weak polar anchoring. Moreover, two easy axes with equal and opposite
pretilt angle were obtained, such that a magnetic field could switch the director from one
easy axis to the other. © 1998 American Institute of Physics.
William Claspy speaks with Professor Alan Rocke, the Henry Eldridge Bourne Professor of History and Distinguished University Professor at Case Western Reserve University. He is a historian of science, specializing in the history of the physical sciences during the 19th and 20th centuries, particularly the development of the science of chemistry and its applications during the course of the nineteenth century, especially in Germany, France, and Great Britain. Alan discusses his latest book, entitled From the Molecular World: A Nineteenth Century Science Fantasy, a translation of a work written in the late 19th century by Hermann Kopp.
In this project we investigated changes in the spatial and temporal concentrations of drug
crimes in the City of Cleveland's neighborhoods duling the 1990s. The main objective of
the study was to identify whether drug offenses and drug offenders were concentrated in
the City's neighborhoods, if these concentrations changed - both in terms of their levels
and geographic dispersion - and to relate the patterns of drug offending to measures of
the social and physical structure of neighborhoods to assess the degree to which changes
in neighborhood conditions were associated with changing patterns of drug offending.
It is shown that energy/length scaling complicates maximizing the first
hyperpolarizability of a single electron as a function of the potential. A more transparent
formula for this hyperpolarizability is given. Examining this formula demonstrates that Zhou
et al.1 have not proved that modulated conjugation results in large hyperpolarizability.
© 2007 Optical Society of America.
Land survey field notes for one hundred lots in Cleveland (Town 8, Range 12) by John Milton Holley
