Results 251 to 260 of about 9,513 (296)

Dwarfmistletoe on Red Fir and White Fir in California

Journal of Forestry, 1963
Abstract Stands of red fir and white fir in California are extensively infected with the fir dwarfmistletoe, and damage is heavy over much of the fir belt. Field observations and cross-inoculation studies show that there are two specialized forms of fir dwarfmistletoe, one attacking only red fir and one only white fir.
J. R. Parmeter, Robert F. Scharpf
openaire   +1 more source

Maximally flat FIR filters

1993 IEEE International Symposium on Circuits and Systems, 2002
A new Bernstein approximant for minimax filters is suggested. Explicit solutions for maximally flat and monotonic filters are obtained as a special case of the new Bernstein approximant for all linear-phase finite impulse response (FIR) filter types. A design technique starting from arbitrary specifications is described.
Todor Cooklev, Akinori Nishihara
openaire   +1 more source

Douglas-Fir Defects caused by the Douglas-Fir Beetle

Journal of Forestry, 1965
Abstract The Douglas-fir beetle is shown to cause pitch streaks in Douglas-fir. These insects are attracted to dead or dying trees but also attack nearby healthy, standing trees. Usually only a small percentage of the attacked trees are killed. The rest sustain some kind of beetle-caused defect in the form of pitch pockets or streaks.
P. G. Belluschi, Norman E. Johnson, H. J. Heikkenen   +2 more
openaire   +1 more source

Comparative Susceptibility of Corkbark Fir and Douglas-fir to Douglas-fir Dwarf Mistietoe

Forest Science, 1984
Abstract Corkbark fir (Abies lasiocarpa var. arizonica [Merriam] Lemm.) is less susceptible to infection by Douglas-fir dwarf mistletoe (Arceuthobium douglasii Engelm.) than previously reported. Infection of corkbark fir was less than 20 percent in nearly all of the mixed conifer stands sampled, regardless of the intensity of ...
openaire   +1 more source

Shoot Growth Models for Douglas-fir and Grand Fir

Forest Science, 1984
Abstract Models were developed for Douglas-fir ( Pseudotsuga menziesii var. glauca (Beissn.) Franco) and grand fir ( Abies grandis (Dougl. ex D.
R. C. Beckwith, W. P. Kemp
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The Geographic Overlap of Noble Fir and Red Fir

Forest Science, 1963
Abstract Most of the fir ( Abies ) at high altitudes in southern Oregon and northwestern California west of the Klamath River, commonly thought to be Shasta red fir ( A. magnifica var. shastensis
openaire   +1 more source

A nutritional study of grand fir and amabilis fir in the greenhouse

2012
Grand fir (Abies grandis (Dougl.) Lindl.) and amabilis fir (A. amabilis (Dougl.) Forbes) were grown in sand cultures from seed for two growing seasons in a greenhouse. The effects of deficiencies of nitrogen, phosphorus, potassium, calcium, magnesium, and sulphur on the growth and development of the seedlings were studied.
openaire   +1 more source

The Dunchurch firs

Notes and Queries, 1877
openaire   +2 more sources

The epidemiology of FIRS in term and late preterm births

Seminars in Fetal and Neonatal Medicine, 2020
Karin B Nelson
exaly  

Extractives of Douglas Fir and Douglas Fir Lignin Residue

Journal of the American Chemical Society, 1947
Ira L. Clark, J. R. Hicks, E. E. Harris
openaire   +1 more source