scholarly journals Cross section sensitivity analysis of a proposed neutron streaming experiment with a two-dimensional model

1979 ◽  
Author(s):  
Y. Seki ◽  
R. T. Santoro ◽  
E. M. Oblow ◽  
J. M. Barnes ◽  
J. L. Lucius
Keyword(s):  
Sensitivity Analysis ◽  
Cross Section ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Two Dimensional Model

scholarly journals Concentration Data and Dimensionality in Groundwater Models: Evaluation Using Inverse Modelling

1998 ◽  
Vol 29 (3) ◽  
pp. 149-178 ◽  
Author(s):  
Heidi Christiansen Barlebo ◽  
Mary C. Hill ◽  
Dan Rosbjerg ◽  
Karsten Høgh Jensen
Keyword(s):  
Groundwater Flow ◽  
Cross Section ◽  
Nonlinear Regression ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Concentration Data ◽  
Flow And Transport ◽  
Two Dimensional Model

A three-dimensional inverse groundwater flow and transport model that fits hydraulic-head and concentration data simultaneously using nonlinear regression is presented and applied to a layered sand and silt groundwater system beneath the Grindsted Landfill in Denmark. The aquifer is composed of rather homogeneous hydrogeologic layers. Two issues common to groundwater flow and transport modelling are investigated: 1) The accuracy of simulated concentrations in the case of calibration with head data alone; and 2) The advantages and disadvantages of using a two-dimensional cross-sectional model instead of a three-dimensional model to simulate contaminant transport when the source is at the land surface Results show that using only hydraulic heads in the nonlinear regression produces a simulated plume that is profoundly different from what is obtained in a calibration using both hydraulic-head and concentration data. The present study provides a well-documented example of the differences that can occur. Representing the system as a two-dimensional cross-section obviously omits some of the system dynamics. It was, however, possible to obtain a simulated plume cross-section that matched the actual plume cross-section well. The two-dimensional model execution times were about a seventh of those for the three-dimensional model, but some difficulties were encountered in representing the spatially variable source concentrations and less precise simulated concentrations were calculated by the two-dimensional model compared to the three-dimensional model. Summed up, the present study indicates that three-dimensional modelling using both hydraulic heads and concentrations in the calibration should be preferred in the considered type of transport studies.

Two-dimensional model for predicting performance of aerated grit chambersA paper submitted to the Journal of Environmental Engineering and Science.

2009 ◽  
Vol 36 (9) ◽  
pp. 1567-1578 ◽  
Author(s):  
Alex Munoz ◽  
Stephanie Young
Keyword(s):  
Sensitivity Analysis ◽  
Velocity Field ◽  
Treatment Plant ◽  
Poisson’S Equation ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Poisson's Equation ◽  
Design Variables ◽  
Predicting Performance ◽  
Two Dimensional Model

A two-dimensional model was developed in this study. The model predicts the performance of a full-scale aerated grit chamber for grit removal from wastewater. The model numerically integrates Poisson’s equation, which describes the motion of the liquid induced by the rising air bubbles. The model makes use of finite element algorithms available in Mathcad to solve Poisson’s equation. The model was developed for predicting the velocity field in the chamber. The model was used to perform a sensitivity analysis of the design variables that affect the performance of an existing grit chamber at the Moose Jaw Wastewater Treatment Plant. The results of the sensitivity analysis indicate that predictions of velocity field are highly sensitive to energy transfer efficiency, air flowrate, and particle settling velocity but less sensitive to variations of wastewater flowrate, diffuser depth, and grid spacing.

Effects of surface and subsurface irregularities on the amplitudes of monochromatic waves

1977 ◽  
Vol 67 (2) ◽  
pp. 353-368
Author(s):  
H. L. Wong ◽  
M. D. Trifunac ◽  
B. Westermo
Keyword(s):  
Ground Motion ◽  
Cross Section ◽  
Displacement Field ◽  
Two Dimensional ◽  
Topographic Feature ◽  
Dimensional Model ◽  
Two Dimensional Model ◽  
Concrete Building ◽  
Measured Displacement ◽  
Dimensional Surface

Abstract Measurements of surface ground motion generated by forced vibration of a nine-story reinforced concrete building at a distance of 2 to 5.5 km are described. Three components of the displacement field were measured at 13 points along a line traversing an elongated canyon underlain by a shallow and dipping alluvial layer. The variations of measured displacement amplitudes have been modeled by (a) a two dimensional surface topographic feature corresponding to the average cross section of the canyon and (b) by a two-dimensional model of an alluvium valley excited by a line source. Comparison of the observed and computed amplitude variations with distance suggests that for the geometry corresponding to this experiment the effect of the dipping layer of alluvium seems to play a considerably more important role than the canyon.

Numerical Assessment of the Ebe Schooner-Brig

2010 ◽  
Vol 133-134 ◽  
pp. 295-300 ◽  
Author(s):  
Stefano Invernizzi ◽  
Clara Bertolini-Cestari ◽  
Emanuele Chiabrera
Keyword(s):  
Cross Section ◽  
Strain Field ◽  
Safety Assessment ◽  
Continuous Monitoring ◽  
National Museum ◽  
Two Dimensional ◽  
Dimensional Model ◽  
The Past ◽  
Numerical Assessment ◽  
Two Dimensional Model

The Ebe schooner-brig was built in 1921 and sailed the Mediterranean’s sea for almost forty years, before being dissected into ninety parts to be transported in Milan (Italy). There, the schooner was reassembled and the naval pavilion of the National Museum of Science and Technology was built up all around the ship. After forty years in the museum, the ship presents significant deformations of both the deck and the keel, particularly in correspondence of the external supports. Despite several interventions in the past and a recent restoration, the deformation phenomenon is still worrying, and the understanding of the real cause is lacking from many aspects. Experts have already advanced some hypotheses, often in opposition to one another, and unfortunately, a continuous monitoring of the ship deformation has not been started yet. In the present paper, the schooner structure is modeled with the commercial finite element code Diana, considering a two-dimensional model of the ship cross-section. The obtained results allow for a deeper understanding of the stress-strain field in the schooner, providing a first safety assessment and useful hints for the design of the monitoring and future interventions.

Commitment to pro- versus counter-attitudinal behavior and the dynamics of social representations

2002 ◽  
Vol 61 (1) ◽  
pp. 34-44 ◽  
Author(s):  
Eric Tafani ◽  
Lionel Souchet
Keyword(s):  
Higher Education ◽  
Social Representations ◽  
Cognitive Restructuring ◽  
Social Representation ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Social Actions ◽  
The Social ◽  
Two Dimensional Model ◽  
Students Attitudes

This research uses the counter-attitudinal essay paradigm ( Janis & King, 1954 ) to test the effects of social actions on social representations. Thus, students wrote either a pro- or a counter-attitudinal essay on Higher Education. Three forms of counter-attitudinal essays were manipulated countering respectively a) students’ attitudes towards higher education; b) peripheral beliefs or c) central beliefs associated with this representation object. After writing the essay, students expressed their attitudes towards higher education and evaluated different beliefs associated with it. The structural status of these beliefs was also assessed by a “calling into question” test ( Flament, 1994a ). Results show that behavior challenging either an attitude or peripheral beliefs induces a rationalization process, giving rise to minor modifications of the representational field. These modifications are only on the social evaluative dimension of the social representation. On the other hand, when the behavior challenges central beliefs, the same rationalization process induces a cognitive restructuring of the representational field, i.e., a structural change in the representation. These results and their implications for the experimental study of representational dynamics are discussed with regard to the two-dimensional model of social representations ( Moliner, 1994 ) and rationalization theory ( Beauvois & Joule, 1996 ).

Unwilling to initiate or willing to avoid the decision process: A two-dimensional model predicting decision process avoidance

2007 ◽  
Author(s):  
Ilona M. McNeill ◽  
Bernard A. Nijstad ◽  
Michel J. J. Handgraaf ◽  
Carsten K. W. De Dreu
Keyword(s):  
Decision Process ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Two Dimensional Model
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