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| 1 | Artificial neural network models predicting the leaf area index:a case study in pure even-aged Crimean pine forests from Turkey显示文摘Background: Leaf Area Index(LAI) is an important parameter used in monitoring and modeling of forest ecosystems. The aim of this study was to evaluate performance of the artificial neural network(ANN) models to predict the LAI by comparing the regression analysis models as the classical method in these pure and even-aged Crimean pine forest stands.Methods: One hundred eight temporary sample plots were collected from Crimean pine forest stands to estimate stand parameters. Each sample plot was imaged with hemispherical photographs to detect the LAI. The partial correlation analysis was used to assess the relationships between the stand LAI values and stand parameters, and the multivariate linear regression analysis was used to predict the LAI from stand parameters. Different artificial neural network models comprising different number of neuron and transfer functions were trained and used to predict the LAI of forest stands.Results: The correlation coefficients between LAI and stand parameters(stand number of trees, basal area, the quadratic mean diameter, stand density and stand age) were significant at the level of 0.01. The stand age, number of trees, site index, and basal area were independent parameters in the most successful regression model predicted LAI values using stand parameters(/?;adj = 0.5431). As corresponding method to predict the interactions between the stand LAI values and stand parameters, the neural network architecture based on the RBF 4-19-1 with Gaussian activation function in hidden layer and the identity activation function in output layer performed better in predicting LAI(SSE(12.1040), MSE(0.1223), RM5 E(0.3497), AIC(0.1040), BIC(-777310) and R2(0.6392)) compared to the other studied techniques.Conclusion: The ANN outperformed the multivariate regression techniques in predicting LAI from stand parameters. The ANN models, developed in this study, may aid in making forest management planning in study forest stands. | ilker Ercanli Alkan Gunlu Muammer Senyurt Sedat Keles | 2018 | Forest Ecosystems2018，5，4： | 4 |
| 2 | Epidemiology of adolescent idiopathic scoliosis显示文摘 | Markus Rafael Konieczny Hüsseyin Senyurt Rüdiger Krauspe | 2013 | Journal of Children’s Orthopaedics2013，，1： | 1 |
| 3 | Selection of native cornelian cherries grown in corum(Turkey)显示文摘 | Karadeniz T Deligoz H Corumlu MS Senyurt M Bak T | | 0，，： | 1 |
| 4 | Epidemiology of adolescent idiopathic scoliosis显示文摘 | Markus Rafael Konieczny Husseyin Senyurt Rudiger Krauspe | 2013 | J Child Orthop2013，7，： | 1 |
| 5 | Matrix physical structure effect on the electro-optic charac- teristics of thiol-ene based H-PDLC films显示文摘 | Askim F Senyurt Garfield Warren Joe B Whitehead Jr | 2006 | Polymer2006，47，8： | 1 |
| 6 | Eosinophilic granuloma: resolution of lesion after biopsy显示文摘 | Bas B Duran H Senyurt | 2011 | J Craniofac Surg2011，22，6： | 1 |
| 7 | Epidemiology of adolescent idiopathic scoliosis显示文摘 | Konieczny M R Senyurt H Krauspe R | 2013 | J Child Orthop2013，7，1： | 1 |
| 8 | Epidemiology of ado- lescent idiopathic scoliosis 显示文摘 | Konieczny MR Senyurt H Krauspe R | 2013 | J Child Orthop2013，，： | 1 |
| 9 | Epidemiology of ado- lescent idiopathic scoliosis 显示文摘 | Konieczny MR Senyurt H Krauspe R | 2013 | J Child Orthop2013，7，1： | 1 |
| 10 | Epidemiology of adolescent idiopathic scoliosis显示文摘 | KONIECZNY MR SENYURT H KRAUSPE R | 2013 | J Child Orthop2013，7，1： | 1 |
| 11 | Epidemiology ofadolescent idiopathic scoliosis显示文摘 | KONIECZNY M R SENYURT H KRAUSPE R | 2013 | J Child Orthop2013，7，1： | 1 |
| 12 | Rapid destruction of sarin surrogates by gas phase reactions with focus on diisopropyl methylphosphonate(DIMP)显示文摘Rapid destruction of stockpiles of sarin and other chemical weapon agents(CWA)requires understanding and quantitative description of the relevant chemical reactions.Rapid reactions at elevated temperatures are of particular interest for prompt agent defeat scenarios.Diisopropyl methylphosphonate(DIMP)is a sarin surrogate particularly well suited to model sarin thermal decomposition and is often used in experiments.This article is a review of different experimental methods addressing decomposition of gasified DIMP,respective results and their interpretations.Major early decomposition products are propene,methylphosphonic acid,methyl(oxo)phosphoniumolate,and isopropanol.Early computational work using available kinetic data for fluorine and the phosphorus-fluorine bond predicted the decomposition under incineration conditions.Experiments using an isothermal flow reactor operated at 700-800 K were used to model DIMP decomposition as unimolecular reaction with results that were consistent with the earlier theoretical work.Decomposition in dynamic environments was studied using DIMP supported on rapidly heated substrates.The results showed different decomposition products and product sequences forming at different heating rates,suggesting the need for revised reaction kinetics.However,species quantification in such experiments is difficult because of inherent large temperature gradients.Plasma produced in a corona discharge was also reported to lead to rapid DIMP decomposition at low temperatures.Decomposition products were distinct from those observed at high temperatures.Shock tube experiments may be well suited to study decomposition of organophosphorus compounds like DIMP following their rapid heating in diverse environments.However,presently,only sarin surrogates other than DIMP have been investigated,and no intermediate reaction products,important for developing a validated mechanism,could be detected. | Elif Irem Senyurt Mirko Schoenitz Edward L.Dreizin | 2021 | Defence Technology(防务技术)2021，17，3： | 0 |
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