Rough surface topography enhances the activation of Wnt/β-catenin signaling in mesenchymal cells

2010 ◽  
Vol 95A (3) ◽  
pp. 682-690 ◽  
Author(s):  
Carlo Galli ◽  
Giovanni Passeri ◽  
Francesca Ravanetti ◽  
Erida Elezi ◽  
Mario Pedrazzoni ◽  
...  
Keyword(s):  
Surface Topography ◽  
Rough Surface ◽  
Mesenchymal Cells

EFFECT OF SURFACE TOPOGRAPHY ON SEISMIC MAPPING

Geophysics ◽  
1946 ◽  
Vol 11 (3) ◽  
pp. 362-372 ◽  
Author(s):  
M. B. Widess
Keyword(s):  
Statistical Analysis ◽  
Surface Topography ◽  
Rough Surface ◽  
Computational Methods ◽  
Surface Relief ◽  
Lateral Variations ◽  
Source Of Error ◽  
Gathering Data ◽  
Effect Of Surface ◽  
Approximate Magnitude

The presence of rough surface topography in a prospect frequently constitutes a source of error in seismic mapping and poses the question of what computational methods can be applied by which seismic maps may be freed of the effect of surface relief. Various aspects of the problem are described. The use of a plane datum‐horizon is generally adequate as a solution of the problem. For greater refinement, the structural map may be modified to account for the overburden effect, the approximate magnitude of which is considered. Further modification may be required when lateral variations in subweathering velocity occur. Statistical analysis for determining the degree of conformity between surface topography and mapped structure at depth is useful in gathering data on the influence of surface topography.

Role of rough surface topography on gas slip flow in microchannels

2012 ◽  
Vol 86 (1) ◽  
Author(s):  
Chengbin Zhang ◽  
Yongping Chen ◽  
Zilong Deng ◽  
Mingheng Shi
Keyword(s):  
Surface Topography ◽  
Rough Surface ◽  
Slip Flow

Application of Contourlet in Research of Rough Surface Topography

2012 ◽  
Vol 542-543 ◽  
pp. 115-118
Author(s):  
Chao Zhou ◽  
Cheng Hui Gao
Keyword(s):  
Surface Topography ◽  
Rough Surface ◽  
Surface Analysis ◽  
Signal Analysis ◽  
Elementary Theory ◽  
Rough Surfaces ◽  
Good Method ◽  
Two Dimensional ◽  
Multi Scale

Since the tribology properties of rough surfaces are closely related to its topography, one of the most important ingredients in tribology research is to find an appropriate tool to analyze and characterize rough surfaces. The elementary theory of contourlet which is a good method for multi-scale and multi-direction signal analysis was introduced and an application of contourlet in rough surface analysis was demonstrated. It was found that contourlet is more sensitive to curved features than general two dimensional wavelets; it is possible to become a new powerful tool for rough surface analysis and characterization.

scholarly journals Multiscale Model Reduction of the Unsaturated Flow Problem in Heterogeneous Porous Media with Rough Surface Topography

Mathematics ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 904
Author(s):  
Denis Spiridonov ◽  
Maria Vasilyeva ◽  
Eric T. Chung ◽  
Yalchin Efendiev ◽  
Raghavendra Jana
Keyword(s):  
Porous Media ◽  
Boundary Conditions ◽  
Surface Topography ◽  
Rough Surface ◽  
Heterogeneous Porous Media ◽  
Coarse Grid ◽  
Basis Functions ◽  
Richards Equation ◽  
Small Scale ◽  
Fine Grid

In this paper, we consider unsaturated filtration in heterogeneous porous media with rough surface topography. The surface topography plays an important role in determining the flow process and includes multiscale features. The mathematical model is based on the Richards’ equation with three different types of boundary conditions on the surface: Dirichlet, Neumann, and Robin boundary conditions. For coarse-grid discretization, the Generalized Multiscale Finite Element Method (GMsFEM) is used. Multiscale basis functions that incorporate small scale heterogeneities into the basis functions are constructed. To treat rough boundaries, we construct additional basis functions to take into account the influence of boundary conditions on rough surfaces. We present numerical results for two-dimensional and three-dimensional model problems. To verify the obtained results, we calculate relative errors between the multiscale and reference (fine-grid) solutions for different numbers of multiscale basis functions. We obtain a good agreement between fine-grid and coarse-grid solutions.

Finite Volume Modeling of Gas Flow in Microbearings with Rough Surface Topography

2016 ◽  
Vol 59 (1) ◽  
pp. 99-107 ◽  
Author(s):  
Wen-Ming Zhang ◽  
Han Yan ◽  
Zhi-ke Peng ◽  
Guang Meng
Keyword(s):  
Surface Topography ◽  
Rough Surface ◽  
Finite Volume ◽  
Gas Flow ◽  
Volume Modeling

Study of the Statistical Models with Contact Parameters of Machine Tool Guideway Rough Surface

2013 ◽  
Vol 568 ◽  
pp. 55-61
Author(s):  
Ya Hui Hu ◽  
Shi Gang Chen ◽  
Lei Wang ◽  
Zhi Xiang He
Keyword(s):  
Surface Topography ◽  
Rough Surface ◽  
Statistical Models ◽  
Friction And Wear ◽  
Great Influence ◽  
Simulation Software ◽  
Growth Trend ◽  
Contact Parameter ◽  
Surface Precision ◽  
Contact Parameters

Friction and wear of the guideway is an important factor which affects its precision, the parameter which affects friction and wear performance is no single. Among them, surface precision of the guideway has a great influence on the wear. In this paper, Taylor Hobson roughness profilometer is used to measure the guideway specimen according to the principle of statistics, and then the surface topography assessment parameters are obtained. Based on those, the rough surface topography is characterized and statistical models with contact parameters are established. Contact models are analyzed by using simulation software Mat lathe results: the contact parameter values show linear growth trend as the distance decreasing, the values become smaller as the roughness increasing, but the trend increases corresponsive.

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