scholarly journals On different types of adjustment usable to calculate the parameters of the stream power law

Geomorphology ◽  
2012 ◽  
Vol 138 (1) ◽  
pp. 203-208 ◽  
Author(s):  
Alain Demoulin ◽  
Arnaud Beckers ◽  
Benoît Bovy
Keyword(s):  
Power Law ◽  
Stream Power ◽  
Different Types

scholarly journals Cosmological constant in chameleon Brans–Dicke theory

2019 ◽  
Vol 28 (01) ◽  
pp. 1950022 ◽  
Author(s):  
Yousef Bisabr
Keyword(s):  
Exact Solution ◽  
Scalar Field ◽  
Cosmological Constant ◽  
Exact Solutions ◽  
Effective Mass ◽  
Potential Function ◽  
Power Law ◽  
Exponential Form ◽  
First Case ◽  
Different Types

We consider a generalized Brans–Dicke model in which the scalar field has a self-interacting potential function. The scalar field is also allowed to couple nonminimally with the matter part. We assume that it has a chameleon behavior in the sense that it acquires a density-dependent effective mass. We consider two different types of matter systems which couple with the chameleon, dust and vacuum. In the first case, we find a set of exact solutions when the potential has an exponential form. In the second case, we find a power-law exact solution for the scale factor. In this case, we will show that the vacuum density decays during expansion due to coupling with the chameleon.

scholarly journals Chaotic ray propagation in corrugated layers

2005 ◽  
Vol 12 (6) ◽  
pp. 1003-1009 ◽  
Author(s):  
M. Bottiglieri ◽  
S. De Martino ◽  
M. Falanga ◽  
C. Godano
Keyword(s):  
Phase Space ◽  
Power Law ◽  
Chaotic Behaviour ◽  
Kam Theorem ◽  
Different Types ◽  
Corrugated Wall

Abstract. The aim of this paper is to study the effects of a corrugated wall on the behaviour of propagating rays. Different types of corrugation are considered, using different distributions of the corrugation heights: white Gaussian, power law, self-affine perturbation. In phase space, a prevalent chaotic behaviour of rays, and the presence of a lot of caustics, are observed. These results entail that the KAM theorem is not fulfilled.

scholarly journals A generalized q growth model based on nonadditive entropy

2020 ◽  
Vol 34 (29) ◽  
pp. 2050281
Author(s):  
Irving Rondón ◽  
Oscar Sotolongo-Costa ◽  
Jorge A. González ◽  
Jooyoung Lee
Keyword(s):  
Evolution Equation ◽  
Growth Model ◽  
Power Law ◽  
Statistical Physics ◽  
Von Bertalanffy ◽  
Model Based ◽  
General Growth ◽  
Different Types ◽  
Nonadditive Entropy ◽  
Growth Laws

We present a general growth model based on nonextensive statistical physics. We show that the most common unidimensional growth laws such as power law, exponential, logistic, Richards, Von Bertalanffy, Gompertz can be obtained. This model belongs to a particular case reported in (Physica A 369, 645 (2006)). The new evolution equation resembles the “universality” revealed by West for ontogenetic growth (Nature 413, 628 (2001)). We show that for early times the model follows a power law growth as [Formula: see text], where the exponent [Formula: see text] classifies different types of growth. Several examples are given and discussed.

scholarly journals Analysis of the velocity distribution in different types of ventilation system ducts

2018 ◽  
Vol 180 ◽  
pp. 02081 ◽  
Author(s):  
Kazimierz Peszyński ◽  
Lukasz Olszewski ◽  
Emil Smyk ◽  
Daniel Perczyński
Keyword(s):  
Velocity Profile ◽  
Velocity Distribution ◽  
Cross Section ◽  
Power Law ◽  
Flow Rate ◽  
Fundamental Problem ◽  
Ventilation System ◽  
Different Types ◽  
Actual Profile ◽  
Ventilation Duct

The paper presents the results obtained during the preliminary studies of circular and rectangular ducts before testing the properties elements (elbows, tees, etc.)of rectangular with rounded corners ducts. The fundamental problem of the studies was to determine the flow rate in the ventilation duct. Due to the size of the channel it was decided to determine the flow rate based on the integration of flow velocity over the considered cross-section. This method requires knowledge of the velocity distribution in the cross section. Approximation of the measured actual profile by the classic and modified Prandtl power-law velocity profile was analysed.

scholarly journals VLA Observations of Stellar Flares: A 3-Hour Flare of the RS CVN Star λ Andromedae and A 5-Minute Flare of the BP STAR HR 5942

1989 ◽  
Vol 104 (2) ◽  
pp. 41-44
Author(s):  
Stephen A. Drake ◽  
Jeffrey L. Linsky
Keyword(s):  
Radio Emission ◽  
Power Law ◽  
Physical Mechanism ◽  
High Sensitivity ◽  
The Other ◽  
Long Period ◽  
Stellar Flares ◽  
Different Types

AbstractWe describe high-sensitivity VLA observations of rapidly varying radio emission (‘flares’) from two stars of very different types, one of which (λ And) is a Long-Period RS CVn system, and the other (HR 5942) is a magnetic Bp star. In both cases, however, the physical mechanism producing the radio emission is most likely to be gyrosynchrotron radiation from mildly relativistic, power-law electrons.

scholarly journals Cooling Intensification of a Continuously Moving Stretching Surface Using Different Types of Nanofluids

2012 ◽  
Vol 2012 ◽  
pp. 1-11
Author(s):  
M. B. Akgül ◽  
M. Pakdemirli
Keyword(s):  
Heat Transfer ◽  
Power Law ◽  
Free Stream ◽  
System Of Equations ◽  
Temperature Profiles ◽  
Governing Equations ◽  
Stretching Surface ◽  
Flow Parameters ◽  
Different Types ◽  
Physical Quantities

The effect of different types of nanoparticles on the heat transfer from a continuously moving stretching surface in a concurrent, parallel free stream has been studied. The stretching surface is assumed to have power-law velocity and temperature. The governing equations are converted into a dimensionless system of equations using nonsimilarity variables. Resulting equations are solved numerically for various values of flow parameters. The effect of physical quantities on the temperature profiles is discussed in detail.

Signal Propagation in Nonlinear Granular Chain

2000 ◽  
Vol 627 ◽  
Author(s):  
Jongbae Hong
Keyword(s):  
Elastic Property ◽  
Power Law ◽  
Power Laws ◽  
Signal Propagation ◽  
Oscillatory Regime ◽  
Granular Chain ◽  
Different Types ◽  
Vertical Chain

ABSTRACTThe vertical granular chain changes the elastic property of the medium due to gravity. Therefore, the solitary propagating mode in the horizontal chain disperses and damps in the vertical chain. We show that there are two different types of propagating modes, i.e., quasi-solitary and oscillatory, depending on the strength of impulse and the dispersion and damping of the signal follow power-laws. The power-law behavior in the linear oscillatory regime is explained analytically. The nonlinear solitary regime in which soliton damps and disperses due to gravity is discussed briefly.

scholarly journals Evaluation of the Power-Law Wind-Speed Extrapolation Method with Atmospheric Stability Classification Methods for Flows over Different Terrain Types

2018 ◽  
Vol 8 (9) ◽  
pp. 1429 ◽  
Author(s):  
Chang Xu ◽  
Chenyan Hao ◽  
Linmin Li ◽  
Xingxing Han ◽  
Feifei Xue ◽  
...  
Keyword(s):  
Wind Speed ◽  
Power Law ◽  
Atmospheric Stability ◽  
Extrapolation Method ◽  
Speed Ratio ◽  
Stability Conditions ◽  
Classification Methods ◽  
Average Value ◽  
Different Types ◽  
Stability Classification

The atmospheric stability and ground topography play an important role in shaping wind-speed profiles. However, the commonly used power-law wind-speed extrapolation method is usually applied, ignoring atmospheric stability effects. In the present work, a new power-law wind-speed extrapolation method based on atmospheric stability classification is proposed and evaluated for flows over different types of terrain. The method uses the wind shear exponent estimated in different stability conditions rather than its average value in all stability conditions. Four stability classification methods, namely the Richardson Gradient (RG) method, the Wind Direction Standard Deviation (WDSD) method, the Wind Speed Ratio (WSR) method and the Monin–Obukhov (MO) method are applied in the wind speed extrapolation method for three different types of terrain. Tapplicability is analyzed by comparing the errors between the measured data and the calculated results at the hub height. It is indicated that the WSR classification method is effective for all the terrains investigated while the WDSD method is more suitable in plain areas. Moreover, the RG and MO methods perform better in complex terrains than the other methods, if two-level temperature data are available.

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