Results 21 to 30 of about 7,801,024 (332)

Maiasaura (Dinosauria: Hadrosauridae) Tibia Osteohistology Reveals Non-annual Cortical Vascular Rings in Young of the Year

open access: yesFrontiers in Earth Science, 2019
Annually, tetrapod vertebrate bone apposition is briefly interrupted, which typically coincides with the yearly environmental nadir. The temporary appositional hiatus is histologically recorded in bone cortex as a hypermineralized ring termed a line of ...
Holly N. Woodward
doaj   +1 more source

Pointer years in the growth of beech trees of the NP "Đerdap" area [PDF]

open access: yesGlasnik Šumarskog Fakulteta: Univerzitet u Beogradu, 2014
This paper defines pointer years and years with distinctive tree rings in the growth of beech in 3 sites (ecological units-EU) of the area of Đerdap, in order to observe the reactions of trees to the effects of various factors of growth.
Stajić Branko
doaj   +1 more source

Energetic impact of reconstructed debris flow on the intensity and duration of growth disturbances in tree rings

open access: yesFrontiers in Earth Science, 2023
A rare study on the quantitative relationship between the energetic impact of debris flows on the intensity and duration of growth disturbances of tree rings was carried out, partly due to a lack of feasible approaches and detailed field evidence.
Xueliang Wang   +15 more
doaj   +1 more source

Limits to making L-shape ring profiles without ring growth [PDF]

open access: yesJournal of Materials Processing Technology, 2021
A novel ring rolling process is proposed to flexibly produce shaped rings without circumferential ring growth, potentially saving material and energy as well as reducing upstream and downstream processing requirements. In this paper, six circumferential constraint rolls are used constrain circumferential growth and enable L-shape profiles to be ...
Cleaver, Christopher John   +2 more
openaire   +4 more sources

Annual tree rings in Piptadenia gonoacantha (Mart.) J.F.Macbr. in a restoration experiment in the Atlantic Forest: potential for dendroecological research

open access: yesActa Botânica Brasílica, 2016
The tree Piptadenia gonoachantha is widely used in forestry and in forest restoration projects, which require methods for evaluating tree growth. Long-term studies are necessary to determine patterns and detect changes in species growth rhythms.
Arno Fritz das Neves Brandes   +3 more
doaj   +1 more source

Short-wavelength stability analysis of thin vortex rings [PDF]

open access: yes, 2003
The linear stability of thin vortex rings are studied by short-wavelength stability analysis. The modified Hill–Schrödinger equation for vortex rings, which incorporates curvature effect, is derived. It is used to evaluate growth rates analytically.
Fukumoto, Y, Hattori, Yuji
core   +2 more sources

Mechanical Properties of Norway Spruce: Intra-Ring Variation and Generic Behavior of Earlywood and Latewood until Failure

open access: yesBioResources, 2013
The alternating earlywood and latewood growth ring structure has a strong influence on the mechanical performance of Norway spruce. In the current study, tensile tests in the longitudinal and tangential directions were performed on a series of specimens ...
Christian Lanvermann   +3 more
doaj   +1 more source

Diversity and effect of Trichoderma isolated from the roots of Pinus densiflora within the fairy ring of pine mushroom (Tricholoma matsutake). [PDF]

open access: yesPLoS ONE, 2018
Pine mushroom (PM, Tricholoma matsutake) is an important ectomycorrhizal fungus in Asia primarily due to its value as a food delicacy. Recent studies have shown that fairy rings of PM have distinctive fungal communities, which suggests that other fungi ...
Seung-Yoon Oh   +3 more
doaj   +1 more source

Tree ring analysis of Brachystegia spiciformis and Isoberlinia tomentosa: Evaluation of the enso-signal in the miombo woodland of eastern Africa [PDF]

open access: yes, 2001
The value of growth rings as proxy data for climate reconstruction was studied in two miombo woodland species in eastern Africa. Growth rings, marked by terminal parenchyma, were visually detectable on carefully prepared stem discs of Isoberlinia ...
Beeckman, Hans   +3 more
core   +2 more sources

Age and growth parameters of the dourado Salminus brasiliensis (Cuvier, 1816) from the river Cuiabá, Mato Grosso State, Brazil

open access: yesActa Scientiarum: Biological Sciences, 2016
Age and growth parameters of Salminus brasiliensis (Curvier, 1816) from the Manso Reservoir and from the river Cuiabá are estimated by their fish scales. Sampling was performed between January and December 2006.
Marina Soares Zuliani   +5 more
doaj   +1 more source

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