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This essay discusses the effect of technical change on wage inequality. I argue that the behavior of wages and returns to schooling indicates that technical change has been skill-biased during the past sixty years. Furthermore, the recent increase in inequality is most likely due to an acceleration in skill bias. In contrast to twentiethcentury developments, much of thr technical change during ...
This paper provides the rst detailed description of the architecture of the computing machines Z1 and Z3 designed by Konrad Zuse in Berlin between 1936 to 1941. The necessary information was obtained from a careful evaluation of the patent application led by Zuse in 1941. Additional insight was gained from a software simulation of the machine's logic. The Z1 was built using purely mechanical co...
The first issue of CA: A Cancer Journal for Clinicians was published in November of 1950. On the 60th anniversary of that date, we briefly review several seminal contributions to oncology and cancer control published in our journal during its first decade.
THE major broad achievements by the luminaries concept of genetic load (Haldane 1937; Muller 1950; Crow 1993). Other essays in the Perspectives series that of science often distract from our appreciation of their significant but narrower contributions to allied refer to Muller are Paul (1988), Lederberg (1991), Crow (1992), and Crow and Abrahamson (1997). fields. One example is Linus Pauling’s ...
abstract in aggregate, active forms of reactive silica with mineral names are sometimes associated with sand and gravel in concrete mixture. alkali hydroxides originated from alkalis in the cement or other resources form an alkaline silica gel with this reactive silica which becomes swallowed and expanded during time causing damage to concrete. there have been growing researches on alkaline r...
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