10,317 research outputs found
MP 2012-01
In 1994 the University of Alaska Fairbanks, School of Natural
Resources and Agricultural Sciences, Agricultural and Forestry
Experiment Station began a project to establish permanent
sample plots (PSP) throughout the forests of northern and
southcentral Alaska. Objectives of the project are to establish
and maintain a system of PSPs to monitor forest growth, yield,
forest health, and ecological conditions/change (Malone et al.,
2009).
To date, 603 PSPs have been established on 201 sites
throughout interior and southcentral Alaska. The PSPs are square
and 0.1 acre in size and in clusters of three. PSPs are remeasured
at a five-year interval. The number of plot remeasurements after
establishment ranges from one to three times.
A large amount of data is collected at each site at time of
establishment and at subsequent remeasurements. Four databases
contain all the data: tree measurement and characteristics, site
description, regeneration, and vegetation data.
Vegetation data collected on the 0.1 acre PSPs includes
species (trees shrub, herb, grass, and non-vascular plants) and
cover, an estimate of the amount of the plot covered by the crown
of each species (cover class) (Daubenmire, 1959). The vegetation
database can be used by land managers and researchers to study
species diversity and forest succession in addition to long-term
monitoring of forest health. The species listed in Appendix 1 and in the vegetation
database are presented by categories: tree, shrub, herb, grass,
rush, sedge, fern, club moss, lichen, moss, and liverwort
Total and Merchantable Volume of White Spruce in Alaska
White spruce (Picea glauca [Moench] Voss) is a valuable commercial species found in interior and southcentral Alaska. Numerous regional and local volume
tables or equations exist; however, no statewide model exists or has been tested for accuracy. There is a demand for an accurate model to determine the
cubic-foot volume of white spruce trees in Alaska. Multiple models were developed for white spruce to estimate total and merchantable cubic-foot volume to
a 2-, 4-, and 6-in. top. These multiple-entry (diameter and height) models were developed for both inside and outside bark volume from a 6-in. stump. The
models were tested on a regional basis at various geographic locations and were shown to be highly accurate. The Alaska models chosen have R2 at or near
0.99 and mean square error from 0 to 0.16 for all models. These models are shown to be superior to other white spruce models in Alaska.This research was supported in part by the US Department of Agriculture,
McIntire-Stennis Act Fund ALK-03-12, and by the School of Natural Resources and Agricultural Sciences, University of Alaska Fairbanks
Western aeronautical test range real-time graphics software package MAGIC
The master graphics interactive console (MAGIC) software package used on the Western Aeronautical Test Range (WATR) of the NASA Ames Research Center is described. MAGIC is a resident real-time research tool available to flight researchers-scientists in the NASA mission control centers of the WATR at the Dryden Flight Research Facility at Edwards, California. The hardware configuration and capabilities of the real-time software package are also discussed
Inverse airfoil design procedure using a multigrid Navier-Stokes method
The Modified Garabedian McFadden (MGM) design procedure was incorporated into an existing 2-D multigrid Navier-Stokes airfoil analysis method. The resulting design method is an iterative procedure based on a residual correction algorithm and permits the automated design of airfoil sections with prescribed surface pressure distributions. The new design method, Multigrid Modified Garabedian McFadden (MG-MGM), is demonstrated for several different transonic pressure distributions obtained from both symmetric and cambered airfoil shapes. The airfoil profiles generated with the MG-MGM code are compared to the original configurations to assess the capabilities of the inverse design method
A guideline for heavy ion radiation testing for Single Event Upset (SEU)
A guideline for heavy ion radiation testing for single event upset was prepared to assist new experimenters in preparing and directing tests. How to estimate parts vulnerability and select an irradiation facility is described. A broad brush description of JPL equipment is given, certain necessary pre-test procedures are outlined and the roles and testing guidelines for on-site test personnel are indicated. Detailed descriptions of equipment needed to interface with JPL test crew and equipment are not provided, nor does it meet the more generalized and broader requirements of a MIL-STD document. A detailed equipment description is available upon request, and a MIL-STD document is in the early stages of preparation
How to Measure a Farm Program
Despite all the discussion about farm programs these days, much confusion still exists about farm programs in general. There\u27s a need to clear the air-to get down to the basic issues involved in farm policy
Using Outlook Information
With minor interruptions, rising prices prevailed from 1932 to 1951; errors in judgement were often overcome by rising prices. Now careful appraisal is more important than it has been for the past decade and more
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