Factors affecting rainfall interception determined by a forest simulator and numerical model

2008 ◽  
Vol 22 (14) ◽  
pp. 2634-2643 ◽  
Author(s):  
T. Toba ◽  
T. Ohta
Keyword(s):  
Numerical Model ◽  
Rainfall Interception ◽  
Factors Affecting

scholarly journals New elements within finite element modeling of magnetostriction phenomenon in BLDC motor

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 459-466
Author(s):  
Podhajecki Jerzy ◽  
Rawicki Stanislaw
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Model ◽  
Finite Element Modeling ◽  
Mechanical Model ◽  
Electrical Machines ◽  
Bldc Motor ◽  
Factors Affecting ◽  
Element Modeling ◽  
Magnetic Forces

AbstractReluctance forces are the main cause of vibration in electrical machines. The influence of magnetostriction is still the matter of controversy. In the article, program Ansys (typical for finite element method) was used to analyze stator deformation due to magnetic forces (Maxwell and magnetostriction) for the different boundaries and different methods by taking into account the windings in the mechanical model. Different parameters of numerical model are important factors affecting the level of magnetostriction deformation.

Study of the hydraulic regime of the St. Lawrence River between Montreal and the city of Québec

1992 ◽  
Vol 19 (1) ◽  
pp. 78-85 ◽  
Author(s):  
S. Robert ◽  
D. Plotte ◽  
J.-C. Rassam ◽  
R. Boivin ◽  
R. Larivière ◽  
...  
Keyword(s):  
Numerical Model ◽  
River Flow ◽  
Free Water ◽  
Water Levels ◽  
Factors Affecting ◽  
Model Study ◽  
Hydraulic Regime ◽  
The City ◽  
Numerical Model Study ◽  
St Lawrence River

This paper presents the results of a numerical model study of the St. Lawrence River flow from the Beauharnois–Les Cèdres and Carillon hydroelectric complexes, just upstream from the Montreal Archipelago, to the city of Québec. The main factors affecting the water levels in the river under free water surface conditions, and their degree of influence, were estimated. In particular, the effects of the flows, local inflows, flow variations, and tide on the water levels along the St. Lawrence maritime channel were analyzed. The daily average flows are of utmost importance, other parameters being adjusting factors. Key words: St. Lawrence River, water level prediction, numerical model.

Factors Affecting the Accuracy of Computations of Historic Structures

2015 ◽  
Vol 1122 ◽  
pp. 253-256
Author(s):  
Aneta Maroušková
Keyword(s):  
Numerical Model ◽  
Bearing Capacity ◽  
Numerical Computation ◽  
Building Materials ◽  
The Other ◽  
Load Bearing Capacity ◽  
Factors Affecting ◽  
Historic Structures ◽  
Precision And Accuracy ◽  
Relevant Factors

Possible approaches to the computation of historic structures and factors affecting the precision and accuracy of the results are presented in the paper. The degradation of building materials or incorrectly done technical and historical surveys affect the data entered into a numerical computation. The complexity of the model or, on the other hand, a significant simplification of the model can lead to the misinterpretation of the results. It is necessary to know what is calculated and be able to decide if the simplification of the numerical model does not entail the achievement of results with large reserves, for example, in the load-bearing capacity of the structure. On the contrary, the complexity of the model can result in its illegibility and potential mistakes in determining the contacts. It can easily happen that, for example, one element in the numerical model of a complex historic roof supports a different one, but, in fact, the opposite is true. The article presents specific examples of structures on paper and possible variations in the results obtained by considering the relevant factors. The results will be mutually compared for transparency.

Factors Affecting the Performance of Molten Salt Heat Receiver

2011 ◽  
Vol 365 ◽  
pp. 8-13 ◽  
Author(s):  
Pei Juan Li ◽  
Yu Ting Cheng ◽  
Shi Liu
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Numerical Model ◽  
Molten Salt ◽  
High Heat ◽  
High Heat Flux ◽  
Convection And Heat Transfer ◽  
Factors Affecting ◽  
Heat Receiver ◽  
Solar Power Tower

The molten salt heat receiver performance of a solar power tower plant is analyzed in this paper. The numerical model of the heterogeneous heat flux boundary of which a half of the single heat receiver is heating and the other half of that is adiabatic heating, and of the heat convection and heat transfer in the molten salt heat receiver on condition of the convective heat loss and the radiation loss boundary conditions is established. In the numerical model, the wall heat conduction and variable property of the molten salt are considered as well as the roughness of the wall. The flow velocity, the temperature distribution and the heat transfer characteristics of the molten salt heat receiver under the conditions of high temperature and high heat flux are presented as important basis for the design and the operation control of the molten salt heat receiver.

Analysis on Sensitivity of Permeability Coefficients of Factors in Non-Uniform Seepage Field

2013 ◽  
Vol 353-356 ◽  
pp. 2586-2590
Author(s):  
Shi Jiang Zhu ◽  
Guo Xin Yan
Keyword(s):  
Numerical Model ◽  
Permeability Coefficient ◽  
Seepage Flow ◽  
Hydropower Station ◽  
Key Factors ◽  
Seepage Field ◽  
Factors Affecting ◽  
Permeability Coefficients ◽  
Physical Quantities ◽  
Determining Factor

Permeability coefficient is the determining factor for physical quantities in the seepage field, which can affect the distribution of all physical quantities including seepage flow. It took a hydropower station tail race as an object, founded FEM numerical model, analyzed the influence of permeability coefficients of cut-off wall and bedrock in non-uniform seepage and got the key factors affecting seepage flow. It provides the references in theory for design and construction of the tailrace.

Numerical study on flow characteristics of rotor pumps including cavitation

2014 ◽  
Vol 229 (14) ◽  
pp. 2626-2638 ◽  
Author(s):  
Yingyuan Liu ◽  
Leqin Wang ◽  
Zuchao Zhu
Keyword(s):  
Numerical Model ◽  
Mass Flow ◽  
Volume Fraction ◽  
Numerical Study ◽  
Flow Characteristics ◽  
Two Dimensional ◽  
Flow Rates ◽  
Factors Affecting ◽  
Remarkable Effect ◽  
Mass Flow Rates

This work is purposed to study the flow characteristics of rotor pumps including cavitation. First, a simplified two-dimensional numerical model is developed and computing strategies of the numerical analysis for cavitation are set up, including the selection of cavitation model and its parameters. Second, the reliability and accuracy of the two-dimensional numerical model are verified by experimental results. Then, several factors affecting the cavitation are discussed, including the rotational speeds, pressure differences, clearance sizes, and inlet pressures. For different rotational speeds and pressure differences, the mass flow rates with cavitation are a little larger than that without cavitation, but the amplitudes of the mass flow rates with cavitation are much larger than that without cavitation. Meanwhile, the volume fraction of the water vapor increases with the increasing speeds and the decreasing pressure differences. However, compared with the influence of rotational speeds, the influence of the pressure differences on the vapor contents is relatively smaller. Regarding the clearance size, the smaller the clearance size is, the stronger the cavitation will be. Furthermore, the clearance size between two rotors has a larger effect on the cavitation than that between rotor and pump case. For inlet pressure, it has a little effect on the mass flow rates when cavitation is not considered, but it presents a remarkable effect for the model with cavitation. In addition, the peaks of the volume fractions of vapor and the mass flow rates generally offset backward with the decreasing inlet pressures.

Progress In The Practical Application Of Automated Image Analysis To Tem Negatives

1977 ◽  
Vol 35 ◽  
pp. 214-217
Author(s):  
F. A. Heckman ◽  
E. Redman ◽  
J.E. Connolly
Keyword(s):  
Image Analysis ◽  
Image Quality ◽  
Exposure Time ◽  
Image Contrast ◽  
Automated Image Analysis ◽  
Practical Application ◽  
Factors Affecting ◽  
High Image Quality ◽  
Qualitative Evidence ◽  
Comprehensive Study

In our initial publication on this subject1) we reported results demonstrating that contrast is the most important factor in producing the high image quality required for reliable image analysis. We also listed the factors which enhance contrast in order of the experimentally determined magnitude of their effect. The two most powerful factors affecting image contrast attainable with sheet film are beam intensity and KV. At that time we had only qualitative evidence for the ranking of enhancing factors. Later we carried out the densitometric measurements which led to the results outlined below.Meaningful evaluations of the cause-effect relationships among the considerable number of variables in preparing EM negatives depend on doing things in a systematic way, varying only one parameter at a time. Unless otherwise noted, we adhered to the following procedure evolved during our comprehensive study:Philips EM-300; 30μ objective aperature; magnification 7000- 12000X, exposure time 1 second, anti-contamination device operating.

Factors affecting microstructural scale in liquid crystalline polymers

1990 ◽  
Vol 48 (4) ◽  
pp. 220-221
Author(s):  
Christine M. Dannels ◽  
Christopher Viney
Keyword(s):  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Factors Affecting ◽  
Crystalline Polymers ◽  
Thermal Expansion Coefficients ◽  
Low Thermal Expansion ◽  
Lower Viscosity ◽  
Fine Microstructure ◽  
Planar Orientation ◽  
Strength And Stiffness

Processing polymers from the liquid crystalline state offers several advantages compared to processing from conventional fluids. These include: better axial strength and stiffness in fibers, better planar orientation in films, lower viscosity during processing, low solidification shrinkage of injection moldings (thermotropic processing), and low thermal expansion coefficients. However, the compressive strength of the solid is disappointing. Previous efforts to improve this property have focussed on synthesizing stiffer molecules. The effect of microstructural scale has been overlooked, even though its relevance to the mechanical and physical properties of more traditional materials is well established. By analogy with the behavior of metals and ceramics, one would expect a fine microstructure (i..e. a high density of orientational defects) to be desirable.Also, because much microstructural detail in liquid crystalline polymers occurs on a scale close to the wavelength of light, light is scattered on passing through these materials.

Factors affecting dentist participation in a state Medicaid program

1990 ◽  
Vol 54 (11) ◽  
pp. 638-643 ◽  
Author(s):  
PC Damiano ◽  
ER Brown ◽  
JD Johnson ◽  
JP Scheetz
Keyword(s):  
Medicaid Program ◽  
Factors Affecting
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