Frequency and damping from time histories - Maximum-slope method.

1967 ◽  
Vol 4 (1) ◽  
pp. 76-78
Author(s):  
T. PETER NEAL
Keyword(s):  
Maximum Slope ◽  
Slope Method ◽  
Time Histories ◽  
Maximum Slope Method

Extension of the Maximum Slope Method to Arbitrary Upstream Fluid Temperature Changes

1968 ◽  
Vol 90 (1) ◽  
pp. 130-134 ◽  
Author(s):  
G. F. Kohlmayr
Keyword(s):  
Heat Transfer ◽  
Analytical Solution ◽  
Transfer Test ◽  
Step Change ◽  
Fluid Temperature ◽  
Critical Number ◽  
Maximum Slope ◽  
Temperature Changes ◽  
Slope Method ◽  
Maximum Slope Method

Locke’s maximum slope method for the reduction of transient heat transfer test data is extended to include arbitrary upstream fluid temperature changes. The analytical solution of the single-blow problem is used to evaluate maximum slopes which are shown to depend, in general, nonmonotonically on the number of transfer units, Ntu. It is shown that there is a critical number of transfer units, (Ntu)crit, such that, for Ntu > (Ntu)crit, the maximum slope method remains applicable. In illustration of the analysis, maximum slopes and maximum slope errors are presented for various upstream temperature changes deviating from the step change.

GRAVITY APPROXIMATION AND INTERPRETATION OF A TWO‐DIMENSIONAL VERTICAL FAULT

Geophysics ◽  
1977 ◽  
Vol 42 (7) ◽  
pp. 1462-1467 ◽  
Author(s):  
Jay Gopal Saha
Keyword(s):  
Thin Plate ◽  
Percentage Error ◽  
Central Plane ◽  
Two Dimensional ◽  
Maximum Slope ◽  
Slope Method ◽  
Vertical Fault ◽  
Maximum Slope Method ◽  
Precise Interpretation

The error in depth determination due to the thin plate approximation of a two‐dimensional vertical fault is investigated by the maximum slope method and the traditional [Formula: see text] method. We show here that although the gravity curves for thin and thick faults are not greatly different, faults with large throws have significant percentage errors in the depth to the central plane which warrant attention in precision interpretation. When the ratio of the throw of the fault to its mid‐depth varies from 1.5 to 1.9, the percentage error in depth increases from 10 to more than 16 percent. The maximum slope method for determination of depth gives larger percentage errors compared to [Formula: see text] measures. When the fault throw is large, a gradient method may be used to find the principal parameters of a two‐dimensional vertical fault. The method is theoretically free from any ambiguity and has other advantages which may facilitate precise interpretation. The thin plate approximation should be avoided in such cases.

scholarly journals Determination Of Heat Transfer Characteristics Employing Modified Maximum Slope Method For Porous Media Heat Exchanger Using Al2O3–Water Nanofluids

2019 ◽  
Vol 128 ◽  
pp. 04011
Author(s):  
Dijin J S ◽  
Rajkumar M R ◽  
Anjan R Nair
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Heat Exchanger ◽  
Engineering System ◽  
Fluid Temperature ◽  
Heat Transfer Characteristics ◽  
Maximum Slope ◽  
Slope Method ◽  
Transfer Characteristics ◽  
Maximum Slope Method

It has been well documented in many literature that porous media and nanofluid can augment heat transfer in many engineering system. However the combined usage of these two media has not been given much attention in literature. The objective of the present work is to experimentally investigate porous media heat exchanger using Al2O3/water nanofluids. The heat transfer characteristics is determined using transient testing method wherein, only one fluid stream flows steadily throughthe test core, then a transient perturbation in the inlet fluid temperature is induced and the outletfluid temperature variation is measured continuously. The measured data is evaluated using the maximum slope method to obtain the heat transfer characteristics. The results show an increase in Nusselt number values with the use of nanofluids in porous media heat exchanger compared to water

scholarly journals Estimating regional pulmonary blood flow in EIT with regularized deconvolution with a Tikhonov regularization

2020 ◽  
Vol 6 (3) ◽  
pp. 60-63
Author(s):  
Xenia Augustin ◽  
Michael Kircher ◽  
Olaf Dössel ◽  
Birgit Stender ◽  
Thomas Bluth ◽  
...  
Keyword(s):  
Tikhonov Regularization ◽  
Transfer Functions ◽  
Impedance Tomography ◽  
Maximum Slope ◽  
Pulmonary Hemodynamic ◽  
Median Correlation ◽  
Maximum Slope Method ◽  
Research Questions ◽  
Perfusion Measurements ◽  
Pet Scans

AbstractElectrical Impedance Tomography (EIT) is a clinically used tool for bed-side monitoring of ventilation. Previous work also showed a high potential for lung perfusion monitoring with indicator-enhanced EIT. However, many research questions have yet to be answered before it can be broadly applied in clinical everyday life. The goal of this work is to evaluate a new method to improve EIT perfusion measurements. Pulmonary hemodynamic transfer functions were estimated using regularized deconvolution with Tikhonov regularization to estimate spatial perfusion parameters. The final comparison between EIT images and PET scans showed a median correlation of 0.897 for the images which were reconstructed using the regularized deconvolution. In comparison the previously used maximum slope method led to a median correlation of 0.868.

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