Results 1 to 10 of about 96,592 (176)

Applications of Chapman-Richards model to geotechnical engineering

Journal of Rock Mechanics and Geotechnical Engineering, 2019
In this paper, the Chapman-Richards model is adapted to best fit three types of nonlinear curves that are generally encountered in geotechnical engineering practices, i.e.
W. Nie, W. Guo
doaj   +3 more sources

MODELING THE GROWTH OF Eucalyptus CLONES USING THE CHAPMAN-RICHARDS MODEL WITH DIFFERENT SYMMETRICAL ERROR DISTRIBUTIONS

Ciência Florestal, 2012
http://dx.doi.org/10.5902/198050987558The objective of this work was to estimate the height growth of Eucalyptus using the Chapman-Richards model considering for the errors the distributions normal, Student t (t) and Cauchy.
Luiz Medeiros de Araujo Lima Filho, José Antônio Aleixo da Silva, Gauss Moutinho Cordeiro, Rinaldo Luiz Caraciolo Ferreira   +3 more
doaj   +3 more sources

The Possibility of Using the Chapman–Richards and Näslund Functions to Model Height–Diameter Relationships in Hemiboreal Old-Growth Forest in Estonia [PDF]

Forests, 2021
In light of the difficulties in stand volume estimation of natural forests, we analyzed height–diameter relationships and derived a set of height estimation equations for volume estimation for naturally developing forest ecosystems, using the Järvselja old-growth and the Laeva commercial forest in Estonia as a case study.
Kristi Nigul, Allar Padari, Andres Kiviste, Steffen M. Noe, Henn Korjus, Diana Laarmann, Lee E. Frelich, Kalev Jõgiste, John A. Stanturf, Teele Paluots, Eneli Põldveer, Vivika Kängsepp, Harli Jürgenson, Marek Metslaid, Ahto Kangur   +14 more
openaire   +1 more source

Effect of secondary dormancy induction on seedling emergence of canola genotypes [PDF]

علوم و فناوری بذر ایران, 2021
The purpose of this study was to quantification the effect of secondary dormancy inducing on emergence rapeseed using Chapman-Richards model under field conditions.
Keyvan Maleki, Nader Salehi, Elias Soltani, Mostafa Oveisi   +3 more
doaj   +1 more source

A Dynamical Model Based on the Chapman–Richards Growth Equation for Fitting Growth Curves for Four Pine Species in Northern Mexico

Forests, 2022
Tree growth models describe the growth and development of forest ecosystems by considering how the dimensions of each simulated tree change within a certain time. These models have commonly used three growth parameters that describe various biological processes and behaviours, considering a sigmoid growth function: (i) the upper asymptote (θ1), which ...
Joao Marcelo Brazao Protazio, Marcos Almeida Souza, Jose Ciro Hernández-Díaz, Jonathan G. Escobar-Flores, Carlos Antonio López-Sánchez, Artemio Carrillo-Parra, Christian Wehenkel   +6 more
openaire   +2 more sources

Nonlinear split-plot design modeling and analysis of rice varieties yield

Scientific African, 2023
In this research, a class of nonlinear split plot design models where the mean function of the split-plot model is not linearizable is presented. This was done by fitting intrinsically nonlinear split-plot design (INSPD) models using the Chapman-Richards
I.J. David, O.E. Asiribo, H.G. Dikko
doaj   +1 more source

Curvas de crescimento e de índice de local para povoamentos de Tectona grandis em Tangará da Serra, Mato Grosso Growth and site index curves for Tectona grandis stands in Tangará da Serra, Mato Grosso State, Brazil

Revista Árvore, 2008
Este estudo teve por objetivo avaliar as tendências de crescimento de variáveis do povoamento e avaliar alternativas para construção de curvas de índice de local para teca (Tectona grandis), em plantios localizados na região de Tangará da Serra - Mato ...
Jovane Pereira da Cruz, Helio Garcia Leite, Carlos Pedro Boechat Soares, João Carlos Chagas Campos, Luit Smit, Gilciano Saraiva Nogueira   +5 more
doaj   +1 more source

The Chapman-Richards Distribution and its Relationship to the Generalized Beta

Forest Ecosystems, 2019
Background The Chapman-Richards distribution is developed as a special case of the equilibrium solution to the McKendrick-Von Foerster equation. The Chapman-Richards distribution incorporates the vital rate assumptions of the Chapman-Richards growth ...
Jeffrey H. Gove, Thomas B. Lynch, Mark J. Ducey   +2 more
doaj   +1 more source

Generalized nonlinear height–diameter models for a Cryptomeria fortunei plantation in the Pingba region of Guizhou Province, China [PDF]

Web Ecology, 2018
The relationship between height and diameter (H-D) is an important component in forest growth and yield models, and a better understanding of the relationship will improve forest monitoring, management, and biomass estimation. Sixteen nonlinear growth
Z. Chai, W. Tan, Y. Li, Y. Li, L. Yan, H. Yuan, Z. Li   +6 more
doaj   +1 more source

Site classification for Eucalyptus sp. in a tropical region of Brazil

Anais da Academia Brasileira de Ciências, 2023
The aim was to determine the productive capacity of a forest site by applying different methods of fitting, combined with geostatistical techniques, to stands of Eucalyptus sp. in a tropical region of Brazil.
ATAÍDES M. FILHO, SYLVIO P. NETTO, SEBASTIÃO A. MACHADO, ANA P.D. CORTE, ALEXANDRE BEHLING   +4 more
doaj   +1 more source