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Effect of Heat Loss on Laminar Flamelet Species Concentration

Journal of Thermal Science 2016年第5期25卷 418-423页

作者： Marco Boccanera diego lentini Dipartimento di Ingegneria Meccanica e Aerospaziale Sapienza Università di Roma

The effects of heat loss on the structure of laminar flamelets,which are the constitutive elements of turbulent flames under the most common operating conditions,are investigated for typical aeronautical gas-turbine operating conditions at *** magnitude of heat loss is quantified via the "enthalpy defect" measured with respect to an adiabatic flame.A procedure to generate laminar flamelets with an assigned enthalpy defect at the boundaries is devised and applied to nonpremixed propane/air flames,as propane reproduces the essential features of higher hydrocarbon *** is found,contrary to commonly held beliefs,that the enthalpy defect has a significant effect on the concentration not only of minor species,but also of main reaction *** effects are found in general to be more pronounced for fuel-rich *** impact is anticipated on the formation rate of nitric *** effects of scalar dissipation rate are also discussed.

关键词： Turbulent Combustion Heat Transfer Laminar Flamelets Hydrocarbon Combustion Aeroengines Gas Turbines

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The Biodiversity of Cyprus Island

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Journal of Environmental Science and Engineering(B) 2015年第3期4卷 125-131页

作者： Alessandro lentini Italian National Research Council-Institute for Technologies Applied to Cultural Heritage Rome 00016 Italy

The aspects considered in this paper refer to remains of food plants found in the archaeological area of Pyrgos （Early Bronze Age, 2000 B.C.） near Limassol in Cyprus, related to the history of agriculture and cultivated plant processing technologies. For the purposes of an initial comparison of the archaeobotanical data, the authors updated a map of rainfall distribution on Cyprus with rainfall and temperature data for the period from 1973 to 2007, to produce an updated view of possible microclimates on the island. Cyprus was one of the Mediterranean islands whose particular orographic features encouraged the phylogenetic evolution of many species, and today it is especially rich in endemic species. Cyprus located at the southeastern boundary among the Mediterranean region, the Pontic region （the Irano-Turanic element） and the Near East （the Syriac and Nubo-Sindic elements） it doesn＇t seem to have effectively influenced the most important endemic species, they were probably preserved by the island＇s microclimates and particular edaphic conditions.

关键词： Biodiversity Cyprus geobotany archaeology seeds macroremains Mediterranean basin.

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Development and Parallelization of an Improved 2D Moving Window Standard Deviation Python Routine for Image Segmentation Purposes

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Computational Water, Energy, and Environmental Engineering 2020年第3期9卷 75-85页

作者： Marcos R. de A. Conceição Luis F. F. de Mendonça Carlos A. D. lentini Oceanography Department Geoscience Institute of the Federal University of Bahia (UFBA) Salvador Brazil Earth and Environmental Physics Department Physics Institute of the Federal University of Bahia (UFBA) Salvador Brazil Tropical Oceanography Group (GOAT) Salvador Brazil

Two additional features are particularly useful in pixelwise satellite data segmentation using neural networks: one results from local window averaging around each pixel (MWA) and another uses a standard deviation estimator (MWSD) instead of the average. While the former’s complexity has already been solved to a satisfying minimum, the latter did not. This article proposes a new algorithm that can substitute a naive MWSD, by making the complexity of the computational process fall from O(N2n2) to O(N2n), where N is a square input array side, and n is the moving window’s side length. The Numba python compiler was used to make python a competitive high-performance computing language in our optimizations. Our results show efficiency benchmars

关键词： Digital Image Processing Image Segmentation Standard Deviation Python Machine Learning

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