Results 41 to 50 of about 804,787 (398)

Stability of Norway spruce (Picea abies [L.] Karst.) stands in the Beskid Śląski and Beskid Żywiecki Mts. from the aspect of their nutrition status

open access: yesJournal of Forest Science, 2008
The aim of the present research was to determine the stability of spruce stands in the areas of threat to forest stability in the Beskid Śląski and Beskid Żywiecki Mts. in the light of their nutrition. In 2002 samples of soil and of one- and two-year-old
J. Barszcz, S. Małek
doaj   +1 more source

Composition of Essential Oils in Needles and Barks of Turkish Red Pine (Pinus brutia Ten.) Infested by Marchalina hellenica Genn.

open access: yesDrvna Industrija, 2022
The scale insect Marchalina hellenica Genn. plays a key role in pine honey production and is hosted mainly by Turkish red pine (Pinus brutia Ten.). The needles of Turkish red pine are rich in essential oils.
Mustafa Burak Arslan   +4 more
doaj   +1 more source

A New Universality for Random Sequential Deposition of Needles

open access: yes, 2000
Percolation and jamming phenomena are investigated for random sequential deposition of rectangular needles on $d=2$ square lattices. Associated thresholds $p_c^{perc}$ and $p_c^{jam}$ are determined for various needle sizes.
Galam, S., Kramer, M., Vandewalle, N.
core   +2 more sources

Localisation and mobility of trace metal in silver fir needles [PDF]

open access: yes, 2012
Trace metals (TM: Co, Ni, Cu, Zn, Cd, and Pb) as well as Al, Mn, and Fe content was measured in needles of a remote silver fir stand in the south of France. TM localisation and behaviour in needles was evaluated by measuring total and internal content of
Gandois, Laure, Probst, Anne
core   +2 more sources

Effect of root canal geometry and needle type on apical extrusion of irrigant: an ex vivo study

open access: yesActa Odontologica Turcica, 2022
Objective: The aim was to evaluate the effect of root canal geometry on the amount of apical extrusion of irrigant, by testing different tapers and needle types.
Büşra Serçe Fikirli   +2 more
doaj   +1 more source

The Detection of Cold Dust in Cas A: Evidence for the Formation of Metallic Needles in the Ejecta

open access: yes, 2004
Recently, Dunne et al. (2003) obtained 450 and 850 micron SCUBA images of CasA, and reported the detection of 2-4 M_sun of cold, 18K, dust in the remnant. Here we show that their interpretation of the observations faces serious difficulties.
Braun R.   +9 more
core   +3 more sources

Validity of particle size analysis techniques for measurement of the attrition that occurs during vacuum agitated powder drying of needle-shaped particles [PDF]

open access: yes, 2012
Analysis of needle-shaped particles of cellobiose octaacetate (COA) obtained from vacuum agitated drying experiments was performed using three particle size analysis techniques: laser diffraction (LD), focused beam reflectance measurements (FBRM) and ...
Hamilton, Peter   +4 more
core   +1 more source

Morphometric characteristics and the content of plastid pigments of the needles of Picea pungens depending on the distance from the highways

open access: yesBiosystems Diversity, 2017
This article examines the condition of the Picea pungens Engelm. plants at various distances from urban highways with high traffic intensity. The objects of the study were the trees P. pungens, whose age was about 35 years. The plants grow on four plots.
V. P. Bessonova, O. A. Ponomaryova
doaj   +1 more source

Granular cooling of hard needles

open access: yes, 1999
We have developed a kinetic theory of hard needles undergoing binary collisions with loss of energy due to normal and tangential restitution. In addition, we have simulated many particle systems of granular hard needles.
A. Goldshtein   +19 more
core   +1 more source

Cloud chambers and crystal growth: Effects of electrically enhanced diffusion on dendrite formation from neutral molecules [PDF]

open access: yes, 1999
We present an extension of the solvability theory for free dendrite growth that includes the effects of electrically enhanced diffusion of neutral polar molecules.
Libbrecht, Kenneth G.   +1 more
core   +1 more source

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