More than 3700 fertilized toad eggs were used in a series of
studies designed to determine the effects of UV-B radiation (290-
315 nm) on temporal developmental patterns, systematic development
and viability prior to metamorphic climax. The eggs were
exposed to radiation from either "white-light" fluorescent lamps
(Vita-Lite, Duro-Test Corporation,...
The structure, hardness, and impact strength of high chromium
cast irons was investigated. From the Fe- Cr- C phase diagram,
a composition with 74.8 wt% Fe, 21.5 wt% Cr, and 3.7 wt% was
selected along the austenite-M₇C₃ eutectic trough. This composition
was bracketed by others with slightly different amounts of...
Ozone, present in the earth's atmosphere, filters incident solar
ultraviolet radiation such that only a portion of the total ultraviolet
spectrum emitted by the sun reaches the planet's surface.
Violation of the integrity of this filter could mean an alteration in
the solar ultraviolet radiation penetrating the atmosphere. Atmospheric
increases...
Settlement of structures built on geologically recent compressible alluvium is a common cause of concern during design. Total settlement results from a combination of: 1) initial elastic settlement, 2) primary consolidation, and 3) secondary compression. The reliability of prediction of total settlement is affected by an understanding of these components...
The dynamics of land use in the State of Oregon are simulated
on a digital computer. The introductory chapter outlines the complex
nature of the problems facing the post-industrial society and argues
that the scientific and professional estates share in the responsibility
for public policy formulation. The second chapter .presents...
A method for predicting the harvest of commercial Dungeness
crab (Cancer magister) one year in advance of the fishing season is
described. The technique is based on the hypothesis that the relative
abundance of sub-legal crabs one year is directly proportional to the
harvest of legal crabs the following year....
The concept of a prestressed cylindrical shell was investigated. In particular, a cylindrical shell constructed from coiled pressurized tubing was analyzed. This analysis was concentrated in two main areas, the first involved the failure modes of the prestressed cylinder. Both the buckling and yielding behavior of the tube walls was...
A detailed study of iron concentrations measured by the reducible,
reactive ferrous, and extractable methods was conducted in Auke Bay,
Alaska during June 1973 and in Hood Canal, Washington during October
1973 and April 1974. The concentrations by each method were generally
highest at the bottom and decreased towards the...
This analysis of Colombia's System of National Park Reservations
accomplishes four objectives: 1) The historical development of national
parks in Colombia was described; 2) The status, as of August,
1974, of the areas administered by the Colombian Renewable Natural
Resources Development Institute (INDERENA) was summarized; 3) An
analysis of major...