نتایج جستجو برای: shelterwood felling

تعداد نتایج: 783  

Journal: :Nanotechnology 2012
Wuxia Li J C Fenton Ajuan Cui Huan Wang Yiqian Wang Changzhi Gu D W McComb P A Warburton

We report that, to enable studies of their compositional, structural and electrical properties, freestanding individual nanoobjects can be selectively felled in a controllable way by the technique of low-current focused-ion-beam (FIB) milling with the ion beam at a chosen angle of incidence to the nanoobject. To demonstrate the suitability of the technique, we report results for zigzag/straight...

Journal: :Archives of environmental health 1972
R F Tarrant C Ore J Allard

THINNING overdense stands to improve growth rate of trees is one way in which the nation's supply of merchantable timber can be increased significantly.' In the Pacific Northwest alone, several million acres of such dense precommercial stands would benefit from thinning. Two basic methods are used to thin dense forest stands—felling unwanted trees with saws or killing them with chemicals. Econo...

2004
Bryce J. Stokes Douglas J. Frederick

A continuous-speed felling and bunching prototype machine was evaluated in harvesting a three-year-old, short-rotation sycamore plantation. A small tractor, grapple skidder, and large chipper were evaluated along with the prototype machine as complete harvesting systems. Prediction equations, production rates, and costs were developed for each component of the systems. Production of the feller ...

Journal: :Croatian Journal of Forest Engineering 2023

Motor-manual timber felling is one of the most dangerous operations in forest and cannot be completely replaced by fully mechanized harvesting a harvester when dealing with large deciduous trees. Shifting center gravity tree ready to felled beyond its tipping line using conventional wedges because worker directly behind stem under crown until just before falls. The can hit trunk itself, but als...

2001
Andrea R. Litt Louis Provencher George W. Tanner Richard Franz

The hypothesis that habitat restoration will provide for community reestablishment and the creation of habitat heterogeneity was examined with regards to the herpetofauna of longleaf pine sandhills in northwest Florida. The herpetofaunal response to restoration was examined in fire-suppressed, hardwood-dominated areas treated with (1) spring fire; (2) felling or girdling; or (3) a granular form...

Journal: :Proceedings of the Symposium on Global Environment 1999

Journal: :Известия СПбЛТА 2017

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