scholarly journals Soil thermal parameters assessment by direct method and mathematical models

2016 ◽  
Vol 7 (10) ◽  
pp. 166-172 ◽  
Author(s):  
V. Shein Evgeny ◽  
Y. Mady Ahmed
Keyword(s):  
Mathematical Models ◽  
Direct Method ◽  
Thermal Parameters ◽  
Soil Thermal Parameters

Evaluation of mathematical models to describe protein fraction degradation kinetics of various oilseed meals

2009 ◽  
Vol 2009 ◽  
pp. 171-171
Author(s):  
M Danesh Mesgaran ◽  
T Tashakkori ◽  
A Heravi Moussavi ◽  
S Danesh Mesgaran ◽  
A Vakili ◽  
...  
Keyword(s):  
Mathematical Models ◽  
Goodness Of Fit ◽  
Degradation Kinetics ◽  
Direct Method ◽  
Rapeseed Meal ◽  
Insoluble Protein ◽  
Degradation Kinetic ◽  
Negative Exponential ◽  
Kinetics Of

In situ procedure is a direct method of measuring the rumen degradation kinetic of a feed nutrient. Data obtained by this technique are generally analysed using an exponential curve (Ørskov and McDonald, 1979). However, very low attention has been paid to choice of mathematical model to fit the curves and goodness-of-fit of the model. Lopez et al. (1999) pointed out that the disappearance of some feed components, particularly structural carbohydrates, exhibits a larger variety of forms than for crude protein (CP). In the present study, two different mathematical models of a straight line or a negative exponential (France et al., 1990; and Ørskov and McDonald, 1979) were selected to evaluate in situ degradation kinetics of protein fractions including true protein (TP), neutral-detergent insoluble protein (NDIP) and acid-detergent insoluble protein (ADIP) of various oilseed meals (cottonseed meal (CSM), soyabean meal (SM) and rapeseed meal (RM)).

Transmission Errors and Backlash Analysis of a Single-Stage Cycloidal Drive Using Tooth Contact Analysis

2018 ◽  
Author(s):  
Yi-Pei Shih ◽  
Bor-Tyng Sheen ◽  
Kun-Yu Wu ◽  
Jyh-Jone Lee
Keyword(s):  
Mathematical Models ◽  
Direct Method ◽  
Contact Analysis ◽  
Industrial Robots ◽  
Tooth Contact Analysis ◽  
Tooth Contact ◽  
Transmission Errors ◽  
Manufacturing Errors ◽  
Dynamic Performances ◽  
Gear Drives

Cycloidal gear drives possess compact sizes, large reduction ratios, and low backlash. They are particularly suitable for applications in precise positioning and large output torque, for example, industrial robots and machine tools. Two main dynamic performances, transmission accuracy and backlash, is directly influenced by manufacturing errors. This paper aims to provide a direct method to effectively evaluate both performances. The mathematical models of transmission errors and backlash are established using the theory of gearing as well as tooth contact analysis. Three cases, considering profile modifications of the cycloidal gear and manufacturing errors, are evaluated to verify the correctness of the mathematical models.

Evaluate the Impact of Porous Media Structure on Soil Thermal Parameters Using X-Ray Computed Tomography

2020 ◽  
Vol 53 (12) ◽  
pp. 1752-1759
Author(s):  
A. Y. Mady ◽  
E. V. Shein ◽  
E. B. Skvortsova ◽  
K. N. Abrosimov
Keyword(s):  
Computed Tomography ◽  
Porous Media ◽  
Thermal Parameters ◽  
X Ray ◽  
X Ray Computed ◽  
The Impact ◽  
Soil Thermal Parameters

Thermal response tests for the identification of soil thermal parameters: A review

2020 ◽  
Author(s):  
Xueping Zhang ◽  
Zongwei Han ◽  
Qiang Ji ◽  
Hongzhi Zhang ◽  
Xiuming Li
Keyword(s):  
Thermal Response ◽  
Thermal Parameters ◽  
Soil Thermal Parameters

Sequential Estimation of Thermal Parameters

1977 ◽  
Vol 99 (2) ◽  
pp. 314-321 ◽  
Author(s):  
J. V. Beck
Keyword(s):  
Heat Transfer ◽  
Mathematical Models ◽  
Least Squares ◽  
Arbitrary Number ◽  
Sequential Estimation ◽  
Computer Programs ◽  
Thermal Parameters ◽  
Sequential Procedure ◽  
Basic Equations ◽  
Complex Phenomena

This paper presents a method for estimating the parameters appearing in heat transfer models. The method involves minimizing a function that is more general than that utilized in least squares. One of the unique features of the method is that it is sequential. Some of the advantages of this feature are that the basic equations are simple in that no matrix inverses are required, computer programs can be easily written to have an arbitrary number of parameters, and the sequential procedure provides information for development for better mathematical models for describing complex phenomena. Some examples are given.

Sign in / Sign up

Export Citation Format

Share Document