135,610 research outputs found
Three-dimensional spectral measurements of paint samples using optical coherence tomography
No full textIn this study, we describe a method for measuring the spectral reflectance of a paint layer at both the surface and in the volume of the paint layers. We first present a fringes model which illustrates the possibilities for spectral reconstruction using a Short-Time-Fourier-Transform algorithm. We investigate the remaing percentage errors and identified that there is a strong fluctuation along the wavelength range of the spectrometer. Then, we demonstrate the validity of our approach experimentally by measuring the spectral reflectance of a paint layer using a custom-made visible light optical coherence tomography system. There, we reconstruct the spectral reflectance of a paint layer by probing the surface and a depth range below the surface. Finally, we show the importance to include a wavelength sensitive correction in the reconstruction for taking into account the spectral shape of the light in the reference path of the interferometer. This work is part of the Down To The Ground project, in which the results of the OCT inspection will be used directly by a consortium of technical art historians and conservators.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Structural Integrity & Composite
Phytophthora Management for Commercial Citrus Groves
No full textPP269, a 2-page full-color fact sheet by Megan M. Dewdney and Jamie D. Yates, highlights symptoms and management for phytophthora foot rot, brown rot, phytophthora root rot, and diaprepes root weevil in citrus groves. Published by the UF Department of Plant Pathology, August 2009.
* Jamie D. Yates' name has changed to Jamie D. Burrow
PP269/PP269: Phytophthora Management for Commercial Citrus Groves Identification Sheet (ufl.edu
Phytophthora Management for Commercial Citrus Groves
No full textPP269, a 2-page full-color fact sheet by Megan M. Dewdney and Jamie D. Yates, highlights symptoms and management for phytophthora foot rot, brown rot, phytophthora root rot, and diaprepes root weevil in citrus groves. Published by the UF Department of Plant Pathology, August 2009.
* Jamie D. Yates' name has changed to Jamie D. Burrow
PP269/PP269: Phytophthora Management for Commercial Citrus Groves Identification Sheet (ufl.edu
Foliar Fungal Disease Management for Commercial Citrus Groves
No full textPP270, a 2-page illustrated fact sheet by Megan M. Dewdney and Jamie D. Yates, highlights symptoms and management for greasy spot, melanose, alternaria brown spot, and citrus scab for commercial citrus groves. Published by the UF Department of Plant Pathology, August 2009.
*Jamie D. Yates' name has changed to Jamie D. Burrow
PP270/PP270: Foliar Fungal Disease Management for Commercial Citrus Groves (ufl.edu
Foliar Fungal Disease Management for Commercial Citrus Groves
No full textPP270, a 2-page illustrated fact sheet by Megan M. Dewdney and Jamie D. Yates, highlights symptoms and management for greasy spot, melanose, alternaria brown spot, and citrus scab for commercial citrus groves. Published by the UF Department of Plant Pathology, August 2009.
*Jamie D. Yates' name has changed to Jamie D. Burrow
PP270/PP270: Foliar Fungal Disease Management for Commercial Citrus Groves (ufl.edu
The effects of farming practices on earthworm dynamics in olive groves of central Greece
No full textWe compared species richness, species composition, density and biomass of earthworm communities in organically and conventionally managed olive groves in central Greece. Earthworm biomass and density was significantly higher (p<0.05) in organic olive groves than in conventional olive groves. The highest species richness was recorded in the organic olive groves. Six species were recorded in total: Octodrilus complanatus, O. croaticus, Dendrobaena byblica, D. veneta, Aporrectodea caliginosa, and Microscolex phosphoreus. Only four of these were found in conventional olive groves, where D. veneta and M. phosphoreus were absent. The most abundant species were O. complanatus, D. veneta, and D. byblica. © Kasparek Verlag, Heidelberg
The effects of farming practices on earthworm dynamics in olive groves of central Greece (Oligochaeta)
No full textWe compared species richness, species composition, density and biomass of earthworm communities in organically and conventionally managed olive groves in central Greece. Earthworm biomass and density was significantly higher (p<0.05) in organic olive groves than in conventional olive groves. The highest species richness was recorded in the organic olive groves. Six species were recorded in total: Octodrilus complanatus, O. croaticus, Dendrobaena byblica, D. veneta, Aporrectodea caliginosa, and Microscolex phosphoreus. Only four of these were found in conventional olive groves, where D. veneta and M phosphoreus were absent. The most abundant species were O. complanatus, D. veneta, and D. byblica
Secure Implementation Experiments: Do Strategy-proof Mechanisms Really Work?
No full textStrategy-proofness, requiring that truth-telling is a dominant strategy, is a standard concept used in social choice theory. Saijo et al. (2003) argue that this concept has serious drawbacks. In particular, many strategy-proof mechanisms have a continuum of Nash equilibria, including equilibria other than dominant strategy equilibria. For only a subset of strategy-proof mechanisms do the set of Nash equilibria and the set of dominant strategy equilibria coincide. For example, this double coincidence occurs in the Groves mechanism when preferences are single-peaked. We report experiments using two strategy-proof mechanisms. One of them has a large number of Nash equilibria, but the other has a unique Nash equilibrium. We found clear differences in the rate of dominant strategy play between the two.Experiment, Laboratory, Secure Implementation, Groves-Clarke, Pivotal, Learning
Andalusian Demand for Non-Market Goods from Mountain Olive Groves
No full textAgricultural multifunctionality is the recognition of the joint exercise of economic, environmental and social functions by this sector. In order to make this concept operative for the design of public policies, it is necessary to estimate the social demand for such functions. The main objective of this article is to present an empirical application in this line. For this purpose we have taken the agricultural system of mountain olive groves in Andalusia (Southern Spain) at risk of abandonment after the decoupling of the EU subsidies as a case study. The economic valuation technique used is the Choice Experiment. According to the results, there is a different contribution of each attribute to the improvement of the Society level of utility. The main finding of this study is the identification of a social demand for public goods and services provided by the mountains olive groves. This support for agricultural multifunctionality is heterogeneous in its perception by the citizens and the valuation of the various attributes that the concept involves. Taking into account the impact of an overall improvement in the attribute levels and the socioeconomic characteristics of the respondents, the results suggest that women, people with higher education levels, urban citizens and families with more than three members are those who benefit most from the provision of public goods by agriculture. There is a different contribution of each attribute to the improvement of the Society level of utility. Thus, and taking into account its WTP for each attribute, keeping rural population in their villages and fighting soil erosion (with 22.61 and 21.55/individual/year, respectively) seem to be the most valued functions of the mountain olive groves by Andalusian citizens. It follows the improvement of the visual quality of the rural landscapes (12.20/individual/year) and the reduction of food residuals (7.14/individual/year). Finally, the results of this study support the new orientation of the CAP which makes decoupled payments on compliance with a range of environmental, food safety, animal and plant health and animal welfare standards, as a result of which, the cross-compliance requirement of the EU agricultural support will, presumably, promote a net increase in social welfare. Yet, according to the results of this research, some efforts should be done to allow cross-compliance to reinforce the objectives of keeping rural population in rural areas and the improvement of the landscape.Agricultural multifunctionality, Economic valuation, Choice experiment, Olive groves, Andalusia (Spain), Crop Production/Industries, Demand and Price Analysis, Q11, Q18, Q24,
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