نتایج جستجو برای: canopy layer

تعداد نتایج: 296597  

پایان نامه :وزارت علوم، تحقیقات و فناوری - پژوهشگاه مواد و انرژی - پژوهشکده سرامیک 1392

thermal barrier coatings (tbcs) are used to provide thermal insulation to the hot section components of gas turbines in order to enhance the operating temperature and turbine efficiency. hot corrosion and thermal shocks are the main destructive factors in tbcs which comes as a result of oxygen and molten salt diffusion into the coating. in this thesis atmospheric plasma spraying was used to dep...

2011
Jenny Owen

As planted forests mature and are clearfelled in patches, second rotation tree crops (restocks) become available to black grouse, a species of conservation concern in the UK. Currently, only a limited amount is known about the resources provided by this habitat to black grouse and their broods. The aims of this study therefore, were to investigate the recovery of field-layer vegetation and the ...

2011
Xianliang Zhou Ning Zhang Michaela TerAvest David Tang Jian Hou Steve Bertman Marjan Alaghmand Paul B. Shepson Mary Anne Carroll Stephen Griffith Sebastien Dusanter Philip S. Stevens

Photolysis of nitrous acid generates hydroxyl radicals—a key atmospheric oxidant—in the lower atmosphere. Significant concentrations of nitrous acid have been reported in the rural atmospheric boundary layer during the day, where photolysis of nitrous acid accounts for up to 42% of sunlight-induced radical production1–7. The observed concentrations of nitrous acid are thought to be sustained by...

1962
A. E. ATKINSON

This paper describes a ~emi-quantitative method of mapping vegetation at scales of the order of one mile to the inch using aerial photographs. It has been developed during a survey of Tongariro National Park in which more information than would normally be derived from a reconnaissance survey is required but where, due to the size of the area, time for sampling is limited. The aim has been to m...

Forest fragmentation results in a loss of forest interior and an increase in edge habitat. We studied how understorey bird community composition and habitat variables changed along an edge-to-interior gradient in a 1248-ha lowland rainforest patch in peninsular Malaysia. Birds and environmental variables such as vegetation structure and litter depth were detected within a 25-m radius of each of...

Journal: :Remote Sensing 2009
Dimitrios Biliouris Dimitry Van der Zande Willem W. Verstraeten Bart Muys Pol Coppin

Multilayer canopy representations are the most common structural stand representations due to their simplicity. Implementation of recent advances in technology has allowed scientists to simulate geometrically explicit forest canopies. The effect of simplified representations of tree architecture (i.e., multilayer representations) of four Fagus sylvatica (L.) stands, each with different LAI, on ...

2000
Kell B. Wilson Paul J. Hanson Dennis D. Baldocchi

The energy balance components were measured above the ground surface of a temperate deciduous forest over an annual cycle using the eddy covariance technique. Over a year, the net radiation at the forest floor was 21.5% of that above the canopy, but this proportion was not constant, primarily because of the distinct phenological stages separated by the emergence and senescence of leaves. The do...

2016
Richard K. F. Nair Micheal P. Perks Andrew Weatherall Elizabeth M. Baggs Maurizio Mencuccini

Temperate forest (15) N isotope trace experiments find nitrogen (N) addition-driven carbon (C) uptake is modest as little additional N is acquired by trees; however, several correlations of ambient N deposition against forest productivity imply a greater effect of atmospheric nitrogen deposition than these studies. We asked whether N deposition experiments adequately represent all processes fou...

2017
Hiroki Itô

BACKGROUND Abandonment of broadleaved secondary forests that have been used for various purposes may cause the loss of biodiversity. Some of these forests suffer from diseases such as Japanese oak wilt. An increasing number of deer also impact some of them. Monitoring and recording the status of such forests is important for their proper management. NEW INFORMATION This data set provides a co...

2010
Mitul Luhar Sylvain Coutu Eduardo Infantes Samantha Fox Heidi Nepf

[1] Laboratory measurements reveal the flow structure within and above a model seagrass meadow (dynamically similar to Zostera marina) forced by progressive waves. Despite being driven by purely oscillatory flow, a mean current in the direction of wave propagation is generated within the meadow. This mean current is forced by a nonzero wave stress, similar to the streaming observed in wave boun...

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