Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16734
Problems and practices in backcountry recreation management: A survey of National Park Service managers Problems and practices in backcountry recreation management: A survey of National Park Service managers
No abstract available.
Authors
J. L. Marion, J.W. Roggenbuck, R.E. Manning
Velocity measurements and changes in position of Thwaites Glacier/iceberg tongue from aerial photography, Landsat images and NOAA AVHRR data Velocity measurements and changes in position of Thwaites Glacier/iceberg tongue from aerial photography, Landsat images and NOAA AVHRR data
The Thwaites Glacier/iceberg tongue complex has been a significant feature of the Antarctic coastline for at least 50 years. In 1986, major changes began to occur in this area. Fast ice melted and several icebergs calved from the base of the iceberg tongue and the terminus of Thwaites Glacier. The iceberg tongue rotated to an east-west orientation and drifted westward. Between 1986 and...
Authors
Jane G. Ferrigno, Baerbel K. Lucchitta, A. L. Mullinsallison, Robert J. Allen, W. G. Gould
[Letter to the editor] Idolizing wolves [Letter to the editor] Idolizing wolves
No abstract available.
Authors
L.D. Mech
The mating behavior of Iguana iguana (Part 2) The mating behavior of Iguana iguana (Part 2)
No abstract available.
Authors
G.H. Rodda
Construction aggregates Construction aggregates
Part of a special section on the market performance of industrial minerals in 1992. Production of construction aggregates increased by 4.6 percent in 1992. This increase was due, in part, to the increased funding for transportation and infrastructure projects. The U.S. produced about 1.05 Gt of crushed stone and an estimated 734 Mt of construction sand and gravel in 1992. Demand is...
Authors
V.V. Tepordei
Efficiency and optimal allocation in the staggered entry design Efficiency and optimal allocation in the staggered entry design
The staggered entry design for survival analysis specifies that r left-truncated samples are to be used in estimation of a population survival function. The ith sample is taken at time Bi, from the subpopulation of individuals having survival time exceeding Bi. This paper investigates the performance of the staggered entry design relative to the usual design in which all samples have a...
Authors
W.A. Link
Selenium accumulation and loss in mallard eggs Selenium accumulation and loss in mallard eggs
Five female mallards (Anas platyrhynchos) that had just started egg laying were first fed a diet containing 15 ppm selenium in the form of selenomethionine for 20 d and then an untreated diet for 20 d. Selenium levels in eggs peaked (to about 13-20 ppm) in about two weeks on the treated diet and leveled off at a low level ( 5 ppm) after about 10 d back on the untreated diet. Selenium...
Authors
G. H. Heinz
Nestling eastern phoebes entangled in fishing line Nestling eastern phoebes entangled in fishing line
No abstract available.
Authors
R. B. Clapp