Results 11 to 20 of about 2,062,774 (354)

The effect of elevation on species richness in tropical forests depends on the considered lifeform: results from an East African mountain forest [PDF]

open access: yes, 2019
Elevation gradients in tropical forests have been studied but the analysis of patterns displayed by species richness and elevation have received little attention.
Amani, Christian   +3 more
core   +1 more source

A seakeeping analysis method for an air-lifted vessel [PDF]

open access: yes, 2008
A seakeeping analysis in the frequency domain is presented to predict the motion response of an airlifted vessel (ALV) in waves. The ALV is supported by pressurised air in two separate cushion chambers; the pressure variation in the cushions has a ...
Jasionowski, A.   +3 more
core   +1 more source

Resolution of a paradox: Hummingbird flight at high elevation does not come without a cost [PDF]

open access: yes, 2004
Flight at high elevation is energetically demanding because of parallel reductions in air density and oxygen availability. The hovering flight of hummingbirds is one of the most energetically expensive forms of animal locomotion, but hummingbirds are ...
Altshuler, Douglas L.   +2 more
core   +3 more sources

Discrete Surface Modeling Based on Google Earth: A Case Study [PDF]

open access: yes, 2012
Google Earth (GE) has become a powerful tool for geological, geophysical and geographical modeling; yet GE can be accepted to acquire elevation data of terrain.
Mei, Gang   +2 more
core   +1 more source

Elevational and latitudinal changes in tree associations and diversity in the Eastern Arc mountains of Tanzania [PDF]

open access: yes, 1996
A total of 200 variable-area plots covering 20 3 ha containing 4000 trees with a basal area of 921 4 m2 were assessed over a combined elevational range of 410-2180 m in the moist forests of three Tanzanian Eastern Arc mountains: West Usambara, Nguru and ...
Lovett, J.C.
core   +1 more source

Influence of bed elevation discordance on flow patterns and head losses in an open-channel confluence [PDF]

open access: yes, 2019
Confluences play a major role in the dynamics of networks of natural and man-made open channels, and field measurements on river confluences reveal that discordance in bed elevation is common.
Cunha Ramos, Pedro   +3 more
core   +1 more source

Location of the elevation axis in a large optical telescope [PDF]

open access: yes, 2004
Proposed designs for the next generation of large optical telescopes favor a tripod or quadrupod secondary support, and a primary supported from the back, but it is not yet clear whether the elevation axis should be in front of the primary or behind it ...
Padin, Stephen
core   +1 more source

Plant species diversity and environmental factor relations in black pine, brutian pine, crimean juniper and oak forests

open access: yesTurkish Journal of Forestry, 2023
In this study, plant species diversity in Black pine, Red pine, Crimean juniper and oak forests in Dursunbey (Balıkesir) district was associated with some environmental variables and stand characteristics.
Halil İbrahim Ürkmez, Serkan Gülsoy
doaj   +1 more source

ICESat/GLAS Data as a Measurement Tool for Peatland Topography and Peat Swamp Forest Biomass in Kalimantan, Indonesia [PDF]

open access: yes, 2011
Indonesian peatlands are one of the largest near-surface pools of terrestrial organic carbon. Persistent logging, drainage and recurrent fires lead to huge emission of carbon each year.
Anderson   +18 more
core   +2 more sources

A low profile radiating element with nearly hemispheric coverage for satellite communications on-the-move hybrid array antenna [PDF]

open access: yes, 2010
A novel design solution of a dual-linearly polarised Ku-band low-profile radiating element for low elevation angle coverage (down to 10° above horizon) is presented. Such an element is suitable for full-duplex Satellite Communications On-The-Move (SCOTM)
Foti, Steve   +3 more
core   +1 more source

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