Results 31 to 40 of about 501,172 (182)
On Kreimer's Hopf algebra structure of Feynman graphs [PDF]
, 1998 We reinvestigate Kreimer's Hopf algebra structure of perturbative quantum field theories with a special emphasis on overlapping divergences. Kreimer first disentangles overlapping divergences into a linear combination of disjoint and nested ones and then
Krajewski, Thomas, Wulkenhaar, Raimar
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Optimisation of forest road network under principles of functionally integrated forest management
Journal of Forest Science, 2003 A traditional approach to problems of the opening-up of forests has been based primarily on technical and economic aspects. It results particularly from the ground configuration and calculations of minimum costs for logging and transport operations ...
P. Hrůza
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Life History of the Butternut Curculio, \u3ci\u3eConotrachelus Juglandis\u3c/i\u3e (Coleoptera: Curculionidae), in Michigan [PDF]
, 2017 (excerpt) The butternut curculio, Conotrachelus juglandis LeConte (Coleoptera: Curculionidae), injures the shoots and nuts of various species and hybrids of Juglans in eastern North America This insect was described in 1876 (LeConte, 1876); its life ...
Corneil, Jeffrey A, Wilson, Louis F
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Development of tertiary roads in the Lednice-Valtice Cultural Landscape
Journal of Forest Science, 2009 The Lednice-Valtice Cultural Landscape is an exemplary area that has been influenced by purposeful human activity for a long time. Under these conditions the nonesuch, highly cultural and ecologically valuable landscape complex has come into being.
J. Caska
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Factors affecting bee communities in forest openings and adjacent mature forest [PDF]
Forest Ecology and Management, 2017 Anthropogenic disturbance of habitat is considered a contributing factor of pollinator declines, but some disturbances such as silviculture, may have positive implications for pollinator communities. Silviculture is a key source of disturbance in the eastern USA and thus, developing a better understanding of its ramifications for these keystone species
H. Patrick Roberts +2 more
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EXTRACTION OF FOREST STANDS PARAMETERS FROM ASTER DATA IN OPEN FOREST [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2012 Abstract. Tree crown size (CS) and stem number per hectare (SN) has become increasingly important for forest management and ecosystem monitoring. Tree crown size is also strongly related to other canopy structural parameters, such as diameter at breast height, tree height and biomass.
M. Abbasi, H. R. Riyahi Bakhtyarib
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Diversity, 2023 The main objective of this study was to determine the heterogeneity of tropical mountain rain forests along a micro-altitudinal gradient scale, integrating species functional traits in the separation of communities.
Omar Cabrera +4 more
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Large-scale estimation of forest canopy opening using remote sensing in Central Africa [PDF]
, 2013 Human activities in tropical rainforests cause disturbances and degradation by opening up the forest canopy. Capacities for measuring the extent of the damage are essential to the calculation of carbon emissions under REDD+ programmes (Reducing Emissions
Bourbier, Lucas +4 more
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On probing the properties of QSOs through their proximity effects on the intergalactic medium
, 2011 The proximity effect (PE) of QSOs is believed to be useful in constraining the QSO lifetime. Observations on the PE so far, however, give apparently contradictory results -- some are consistent with a long QSO lifetime (>~ a few 10^7 yr), but others ...
Adelberger +31 more
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Ciência Florestal, 2018 Secondary forest area enlarged significantly in the recent years. Due to the importance that this kind of forest has taken regarding plans for restoration and conservation, a wider understanding of its organization and functioning, considering the ...
Marcos Paulo da Cruz +2 more
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