Numerical Calculation and Analysis of the Normal Relationship of the Dual-Frequency Altimeter Backscatter Coefficient

2017 ◽  
Vol 3 (6) ◽  
pp. 01-04
Author(s):  
Junwu Tao ◽  
Jian Shi
Keyword(s):  
Numerical Calculation ◽  
Dual Frequency ◽  
Backscatter Coefficient ◽  
Relationship Of ◽  
Normal Relationship

scholarly journals An application of chaos gray-encoded genetic algorithm for Philip infiltration model

2018 ◽  
Vol 22 (4) ◽  
pp. 1581-1588 ◽  
Author(s):  
Kai-Wen Wang ◽  
Xiao-Hua Yang ◽  
Yu-Qi Li ◽  
Chang-Ming Liu ◽  
Xing-Jian Guo
Keyword(s):  
Genetic Algorithm ◽  
Numerical Calculation ◽  
Optimization Algorithm ◽  
Optimization Technique ◽  
Parameters Estimation ◽  
Physical Parameters ◽  
Perturbation Function ◽  
Infiltration Model ◽  
Cumulative Infiltration ◽  
Relationship Of

To improve the precision of parameters? estimation in Philip infiltration model, chaos gray-coded genetic algorithm was introduced. The optimization algorithm made it possible to change from the discrete form of time perturbation function to a more flexible continuous form. The software RETC and Hydrus-1D were applied to estimate the soil physical parameters and referenced cumulative infiltration for seven different soils in the USDA soil texture triangle. The comparisons among Philip infiltration model with different numerical calculation methods showed that using optimization technique can increase the Nash and Sutcliffe efficiency from 0.82 to 0.97, and decrease the percent bias from 14% to 2%. The results indicated that using the discrete relationship of time perturbation function in Philip infiltration model?s numerical calculation underestimated model?s parameters, but this problem can be corrected a lot by using optimization algorithm. We acknowledge that in this study the fitting of time perturbation function, Chebyshev polynomial with order 20, did not perform perfectly near saturated and residue water content. So exploring a more appropriate function for representing time perturbation function is valuable in the future.

scholarly journals Normal Relationship of  - and Non  -Cells Not Needed for Successful Islet Transplantation

Diabetes ◽  
2007 ◽  
Vol 56 (9) ◽  
pp. 2312-2318 ◽  
Author(s):  
A. J.F. King ◽  
J. R. Fernandes ◽  
J. Hollister-Lock ◽  
C. E. Nienaber ◽  
S. Bonner-Weir ◽  
...  
Keyword(s):  
Islet Transplantation ◽  
Relationship Of ◽  
Normal Relationship

Single ventricle with normal relationship of the great vessels and pulmonic stenosis

1969 ◽  
Vol 78 (4) ◽  
pp. 530-536 ◽  
Author(s):  
Andrew P. Klaus ◽  
Robert M. Smith ◽  
Arthur B. Schneider ◽  
Brent M. Parker
Keyword(s):  
Single Ventricle ◽  
Pulmonic Stenosis ◽  
Great Vessels ◽  
Relationship Of ◽  
Normal Relationship

Turkey Bones from Wetherill Mesa

1965 ◽  
Vol 19 ◽  
pp. 161-166 ◽  
Author(s):  
Lyndon L. Hargrave
Keyword(s):  
Domestic Fowl ◽  
Meleagris Gallopavo ◽  
Economic Factor ◽  
Archaeological Sites ◽  
Wild Turkey ◽  
Cut Marks ◽  
Turkey Meat ◽  
Relationship Of ◽  
Normal Relationship

AbstractTurkey bones occurred in some archaeological sites of Wetherill Mesa in such quantity and form as to demonstrate the value of this domestic fowl as a major economic factor in the lives of the local inhabitants. Here are ample evidences of the use of turkey bones in the manufacture of tools and jewelry and of the use of turkey meat as food. Actual evidence of cooking was not recognized, but butchering techniques were indicated by cut marks on bones. Some occurrences of groups of disarticulated bones in a normal relationship of articulation may or may not have a ritual meaning. Some information is given that may be helpful in distinguishing bones of the Wild Turkey (Meleagris gallopavo merriami) from bones of the archaeological and modern domestic breeds. Comments are also made on some problems that deal with the turkey as an economic factor in the lives of peoples of other areas in the Southwest.

Research on Aerodynamic Characteristics of Morphing Aircraft with a Telescopic Wing

2013 ◽  
Vol 709 ◽  
pp. 257-261
Author(s):  
Xi You Zhao ◽  
Jun Hu
Keyword(s):  
Numerical Calculation ◽  
High Speed ◽  
Aerodynamic Characteristics ◽  
Aerodynamic Performance ◽  
Aerodynamic Coefficient ◽  
Morphing Aircraft ◽  
Task Requirements ◽  
Before And After ◽  
Relationship Of ◽  
The Relationship

A kind of morphing aircraft based on the concept of telescopic wing was designed in this paper. With the numerical calculation, it compared the aerodynamic characteristics before and after the morphing of the aircraft, and analyzed the relationship of the aircraft aerodynamic coefficient to its length, angle of attack and flight Mach number. The result showed that through morphing the movable wing, the aircraft can significantly change the lift, drag and other aerodynamic characteristics; the morphing aircraft can satisfy the dual task requirements of low-speed cruise and high-speed attack. Compared with the traditional aircraft in fixed shape, it had a better aerodynamic performance.

The Relationship of Symmetric Modification Parameters and Contact Line of Worm Gear

2011 ◽  
Vol 121-126 ◽  
pp. 1717-1721
Author(s):  
Xiao Lin Wang ◽  
Xiao Ru Hao ◽  
Xiao Sheng Zhang
Keyword(s):  
Numerical Calculation ◽  
Contact Line ◽  
Accurate Method ◽  
Worm Gear ◽  
Line Equation ◽  
Meshing Equation ◽  
Relationship Of ◽  
The Relationship

By a reasonable transition of the meshing equation and the contact line equation based on the principle of spatial meshing, using matlab numerical calculation and graphical function to draw a diagram of modification parameters and contact line of worm gear. Proposing a fast and accurate method for distinguishing the type of contact line. For further analysis of worm gear meshing performance provided a useful value.

The Broyden Method for M-P-Φ Relationship of Beam-Column with Residual Stresses

2013 ◽  
Vol 712-715 ◽  
pp. 1071-1074
Author(s):  
Jian Qin ◽  
Yong Jun Xia ◽  
Jin Miao Zhang
Keyword(s):  
Numerical Calculation ◽  
Residual Stresses ◽  
Nonlinear Equations ◽  
Beam Columns ◽  
Broyden Method ◽  
Iterative Calculation ◽  
Relationship Problem ◽  
Calculation Process ◽  
Relationship Of ◽  
The Relationship

The Broyden method for the numerical calculation of Moment-Thrust-Curvature (M-P-Φ) relationship of beam-column is put forward, which is suitable for all combinations of moment, thrust and curvature considering the effect of residual stresses. The relationship problem is simplified as two nonlinear equations of four variables. When two of the 4 variables are given, the relationship can be obtained by Broyden method. The advantages of Broyden method are discussed and the iterative calculation process is listed. The method offers significant improvements in accuracy, robustness and calculation amount of the solution, which can be used for beam-columns with any type section.

scholarly journals Icing Degree Characterization of Insulators Based on the Equivalent Collision Coefficient of Standard Rotating Conductors

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3326
Author(s):  
Zhijin Zhang ◽  
Yi Zhang ◽  
Xingliang Jiang ◽  
Jianlin Hu ◽  
Qin Hu
Keyword(s):  
Numerical Calculation ◽  
Complex Structure ◽  
Calculation Model ◽  
Ice Thickness ◽  
Test Results ◽  
Water Droplets ◽  
Relationship Of ◽  
The Relationship

Due to the complex structure of insulators, it is difficult to use parameters such as icicle length or ice thickness of an insulator to directly characterize the degree of icing of an insulator. Rotating conductors are widely used in monitoring icing degree on insulators, but the relationship between ice degree on the insulator and the rotating conductor has not been verified. In this paper, the water droplets collision coefficient α1 was put forward to characterize icing degree, and a new numerical calculation model where α1 on different regions of an insulator is calculated was proposed. Combining the freezing fraction α3 of the insulator and rotating conductor, the equivalent relationship of ice weight between insulator and rotating conductor can be established, which was afterwards verified through the icing tests. The test results indicate that ice weight on an insulator increases linearly with the increase of ice weight on the rotating conductor, and the model proposed in this paper can reflect actual results more accurately than previous models. In such cases, the method of using ice weight on a rotating conductor to predict that on an insulator based on the model proposed in this paper could be widely adopted.

Study on Binary-Medium Model of Fissured Loess

2012 ◽  
Vol 256-259 ◽  
pp. 240-244 ◽  
Author(s):  
Fu Rong Yan ◽  
Wen Fan ◽  
Ting Yin He
Keyword(s):  
Composite Material ◽  
Comparative Analysis ◽  
Numerical Calculation ◽  
Triaxial Test ◽  
Theoretical Framework ◽  
Stress Strain ◽  
Medium Model ◽  
Relationship Of ◽  
The Relationship ◽  
Breakage Mechanics

On the basis of the theoretical framework of breakage mechanics for geo-material ,the fissured loess can be regarded as a composite material consisting of bonded blocks and weakened bands，therefore a fissured loess binary-medium model is formulated. Then the model will be applied to the study of fissured loess. By the numerical calculation, the relationship of stress-strain can be obtained. A comparative analysis between calculation and triaxial test has been done. The results show that there is a good adaptability to apply the binary medium model to fissured loess.

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