scholarly journals Estimating total horizontal aeolian flux within shrub-invaded groundwater-dependent meadows using empirical and mechanistic models

2013 ◽  
Vol 118 (2) ◽  
pp. 1132-1146 ◽  
Author(s):  
Kimberly R. Vest ◽  
Andrew J. Elmore ◽  
James M. Kaste ◽  
Gregory S. Okin ◽  
Junran Li
Keyword(s):  
Mechanistic Models ◽  
Empirical And Mechanistic Models

Analysis of Ammonia Volatilization Loss from a Paddy Soil With Empirical and Mechanistic Models

2021 ◽  
pp. 2000230
Author(s):  
Wen‐Ming Xie ◽  
Pei‐Kun Yuan ◽  
You Ma ◽  
Wei‐Ming Shi ◽  
Hai‐Lin Zhang ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Ammonia Volatilization ◽  
Mechanistic Models ◽  
Empirical And Mechanistic Models

Estimation of enteric methane emissions trends (1990–2008) from Manitoba beef cattle using empirical and mechanistic models

2011 ◽  
Vol 91 (2) ◽  
pp. 305-321 ◽  
Author(s):  
Aklilu Alemu ◽  
K. H. Ominski ◽  
E. Kebreab
Keyword(s):  
Beef Cattle ◽  
Methane Emissions ◽  
Mechanistic Models ◽  
Tier 2 ◽  
Cattle Population ◽  
Production Environment ◽  
Feed Composition ◽  
Enteric Methane ◽  
Empirical And Mechanistic Models ◽  
Enteric Methane Emissions

Alemu, A. W., Ominski, K. H. and Kebreab, E. 2011. Estimation of enteric methane emissions trends (1990–2008) from Manitoba beef cattle using empirical and mechanistic models. Can. J. Anim. Sci. 91: 305–321. The objective of this study was to estimate and assess trends in enteric methane (CH4) emissions from the Manitoba beef cattle population from the base year of 1990 to 2008 using mathematical models. Two empirical (statistical) models: Intergovernmental Panel on Climate Change (IPCC) Tier 2 and a nonlinear equation (Ellis), and two dynamic mechanistic models: MOLLY (v3) and COWPOLL were used. Beef cattle in Manitoba were categorized in to 29 distinct subcategories based on management practice, physiological status, gender, age and production environment. Data on animal performance, feeding and management practices and feed composition were collected from the literature as well as from provincial and national sources. Estimates of total enteric CH4 production from the Manitoba beef cattle population varied between 0.9 and 2.4 Mt CO2 eq. from 1990 to 2008. Regardless of the type of models used, average CH4 emissions for 2008 were estimated to be 45.2% higher than 1990 levels. More specifically, CH4 emissions tended to increase between 1990 and 1996. Emissions were relatively stable between 1996 and 2002, increased between 2003 and 2005, but declined by 13.2% between 2005 and 2008, following the same trend as that observed in the beef cattle population. Models varied in their estimates of CH4 conversion rate (Ym, percent gross energy intake), emission factor (kg CH4 head−1 yr−1) and CH4 production. Total CH4 production estimates ranged from 1.2 to 2.0 Mt CO2 eq. for IPCC Tier 2, from 0.9 to 1.5 Mt CO2 eq. for Ellis, from 1.3 to 2.1 Mt CO2 eq. for COWPOLL and from 1.5 to 2.4 Mt CO2 eq. for MOLLY. The results indicate that enteric CH4 estimates and emission trends in Manitoba were influenced by the type of model and beef cattle population. As such, it is necessary to use appropriate models for reliable estimates for enteric CH4 inventory. A more robust approach may be to integrate different models by using mechanistic models to estimate regional Ym values, which may then be used as input for the IPCC Tier 2 model.

Empirical and Mechanistic Models for Flight Delay Risk Distributions

2013 ◽  
pp. 577-582 ◽  
Author(s):  
Lucian Ionescu ◽  
Claus Gwiggner ◽  
Natalia Kliewer
Keyword(s):  
Mechanistic Models ◽  
Flight Delay ◽  
Empirical And Mechanistic Models

Photosynthesis in Stands of Green Peppers. An Application of Empirical and Mechanistic Models to Controlled-environment Data

1976 ◽  
Vol 40 (6) ◽  
pp. 1293-1307 ◽  
Author(s):  
B. ACOCK ◽  
D. W. HAND ◽  
J. H. M. THORNLEY ◽  
J. WARREN WILSON
Keyword(s):  
Controlled Environment ◽  
Mechanistic Models ◽  
Empirical And Mechanistic Models

A review of empirical and mechanistic models of lactational performance by the dairy cow

1991 ◽  
Vol 29 (2-3) ◽  
pp. 115-130 ◽  
Author(s):  
D.E. Beever ◽  
A.J. Rook ◽  
J. France ◽  
M.S. Dhanoa ◽  
M. Gill
Keyword(s):  
Dairy Cow ◽  
Mechanistic Models ◽  
Lactational Performance ◽  
Empirical And Mechanistic Models

Empirical and mechanistic models for the particle export ratio

2005 ◽  
Vol 19 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
John P. Dunne ◽  
Robert A. Armstrong ◽  
Anand Gnanadesikan ◽  
Jorge L. Sarmiento
Keyword(s):  
Mechanistic Models ◽  
Export Ratio ◽  
Particle Export ◽  
Empirical And Mechanistic Models

Functional linkages between leaf traits and net photosynthetic rate: reconciling empirical and mechanistic models

2005 ◽  
Vol 19 (4) ◽  
pp. 602-615 ◽  
Author(s):  
B. SHIPLEY ◽  
D. VILE ◽  
E. GARNIER ◽  
I. J. WRIGHT ◽  
H. POORTER
Keyword(s):  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Leaf Traits ◽  
Mechanistic Models ◽  
Empirical And Mechanistic Models

Heat Transfer and Wall Heat Flux Partitioning During Subcooled Flow Nucleate Boiling—A Review

2006 ◽  
Vol 128 (12) ◽  
pp. 1243-1256 ◽  
Author(s):  
Gopinath R. Warrier ◽  
Vijay K. Dhir
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Heat Flux ◽  
Nucleate Boiling ◽  
Wall Heat Flux ◽  
Forced Flow ◽  
Mechanistic Models ◽  
Subcooled Flow ◽  
Flux Partitioning ◽  
Empirical And Mechanistic Models

In this paper we provide a review of heat transfer and wall heat flux partitioning models/correlations applicable to subcooled forced flow nucleate boiling. Details of both empirical and mechanistic models that have been proposed in the literature are provided. A comparison of the experimental data with predictions from selected models is also included.

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