Improved dynamic correction method in seismic analysis of both classically and non-classically damped structures

2001 ◽  
Vol 30 (4) ◽  
pp. 501-517 ◽  
Author(s):  
Antonino D'Aveni ◽  
Giuseppe Muscolino
Keyword(s):  
Seismic Analysis ◽  
Correction Method ◽  
Dynamic Correction

A dynamic correction for the seismic analysis of structures

2019 ◽  
Vol 4 (1) ◽  
Author(s):  
M. Dhileep ◽  
P. D. Arumairaj ◽  
G. Hemalatha
Keyword(s):  
Seismic Analysis ◽  
Dynamic Correction

Proposal on dynamic correction method for resonance ionization mass spectrometry

LAP 2012 ◽  
2013 ◽  
pp. 47-51
Author(s):  
Takuma Noto ◽  
Hideki Tomita ◽  
Sven Richter ◽  
Fabian Schneider ◽  
Klaus Wendt ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Correction Method ◽  
Ionization Mass Spectrometry ◽  
Resonance Ionization ◽  
Ionization Mass ◽  
Dynamic Correction ◽  
Resonance Ionization Mass Spectrometry

Proposal on dynamic correction method for resonance ionization mass spectrometry

2013 ◽  
Vol 216 (1-3) ◽  
pp. 47-51 ◽  
Author(s):  
Takuma Noto ◽  
Hideki Tomita ◽  
Sven Richter ◽  
Fabian Schneider ◽  
Klaus Wendt ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Correction Method ◽  
Ionization Mass Spectrometry ◽  
Resonance Ionization ◽  
Ionization Mass ◽  
Dynamic Correction ◽  
Resonance Ionization Mass Spectrometry

scholarly journals Quantifying rainfall in Greenland: a combined observational and modelling approach

2021 ◽  
Author(s):  
Baojuan Huai ◽  
Michiel R. van den Broeke ◽  
Carleen H. Reijmer ◽  
John Cappellen
Keyword(s):  
Climate Model ◽  
Regional Climate ◽  
Correction Method ◽  
Horizontal Resolution ◽  
Spatial And Temporal Variability ◽  
Monthly Precipitation ◽  
Dynamic Correction ◽  
Correction Model ◽  
Precipitation Gauge

AbstractThis paper estimates rainfall totals at 17 Greenland meteorological stations, subjecting data from in-situ precipitation gauge measurements to seven different precipitation phase schemes to separate rain- and snowfall amounts. To correct the resulting snow/rain fractions for undercatch, we subsequently use a Dynamic Correction Model (DCM) for Automatic Weather Stations (AWS, Pluvio gauges) and a regression analysis correction method for staffed stations (Hellmann gauges). With observations ranging from 5% to 57% for cumulative totals, rainfall accounts for a considerable fraction of total annual precipitation over Greenland’s coastal regions, with the highest rain fraction in the south (Narsarsuaq). Monthly precipitation and rainfall totals are used to evaluate the regional climate model RACMO2.3. The model realistically captures monthly rainfall and total precipitation (R=0.3-0.9), with generally higher correlations for rainfall for which the undercatch correction factors (1.02-1.40) are smaller than those for snowfall (1.27-2.80), and hence the observations more robust. With a horizontal resolution of 5.5 km and simulation period from 1958-present, RACMO2.3 therefore is a useful tool to study spatial and temporal variability of rainfall in Greenland, although further statistical downscaling may be required to resolve the steep rainfall gradients.

scholarly journals On the importance of appropriate rain-gauge catch correction for hydrological modelling at mid to high latitudes

2012 ◽  
Vol 9 (3) ◽  
pp. 3607-3655 ◽  
Author(s):  
S. Stisen ◽  
A. L. Højberg ◽  
L. Troldborg ◽  
J. C. Refsgaard ◽  
B. S. B. Christensen ◽  
...  
Keyword(s):  
Model Performance ◽  
Correction Method ◽  
Winter Precipitation ◽  
Rain Gauge ◽  
Model Parameters ◽  
High Latitudes ◽  
Correction Factors ◽  
Dynamic Precipitation ◽  
Dynamic Correction ◽  
Optimized Model

Abstract. An existing rain gauge catch correction method addressing solid and liquid precipitation was applied both as monthly mean correction factors based on a 30 yr climatology (standard correction) and as daily correction factors based on daily observations of wind speed and temperature (dynamic correction). The two methods resulted in different winter precipitation rates for the period 1990–2010. The resulting precipitation data sets were evaluated through the comprehensive Danish National Water Resources model (DK-Model) revealing major differences in both model performance and optimized model parameter sets. Simulated stream discharge is improved significantly when introducing a dynamic precipitation correction, whereas the simulated hydraulic heads and multi-annual water balances performed similarly due to recalibration adjusting model parameters to compensate for input biases. The resulting optimized model parameters are much more physically plausible for the model based on dynamic correction of precipitation. A proxy-basin test where calibrated DK-Model parameters were transferred to another region without site specific calibration showed better performance for parameter values based on the dynamic correction. Similarly, the performances of the dynamic correction method were superior when considering two single years with a much dryer and a much wetter winter, respectively, as compared to the winters in the calibration period (differential split-sample tests). We conclude that dynamic precipitation correction should be carried out for studies requiring a sound dynamic description of hydrological processes and it is of particular importance when using hydrological models to make predictions for future climates when the snow/rain composition will differ from the past climate. This conclusion is expected to be applicable for mid to high latitudes especially in coastal climates where winter precipitation type (solid/liquid) fluctuate significantly causing climatological mean correction factors to be inadequate.

Methods for Calculating Bending Moment and Shear Force in the Moving Mass Problem

2004 ◽  
Vol 126 (4) ◽  
pp. 542-552 ◽  
Author(s):  
Bruno Biondi ◽  
Giuseppe Muscolino ◽  
Anna Sidoti
Keyword(s):  
Dynamic Analysis ◽  
Series Expansion ◽  
Shear Force ◽  
Bending Moment ◽  
Continuous System ◽  
Correction Method ◽  
System Response ◽  
Moving Mass ◽  
Dynamic Correction ◽  
Different Levels

Two methods able to capture with different levels of accuracy the discontinuities in the bending moment and shear force laws in the dynamic analysis of continuous structures subject to a moving system modeled as a series of unsprung masses are presented. The two methods are based on the dynamic-correction method, which improves the conventional series expansion by means of a pseudostatic term, and on an eigenfunction series expansion of the continuous system response, which takes into account the effect of the moving masses on the structure, respectively.

scholarly journals A Fast-Response Calorimeter with Dynamic Corrections for Transient Heat Transfer Measurements

2020 ◽  
Vol 10 (17) ◽  
pp. 6143
Author(s):  
Shizhong Zhang ◽  
Qiu Wang ◽  
Jinping Li ◽  
Xiaoyuan Zhang ◽  
Hong Chen
Keyword(s):  
Heat Dissipation ◽  
Fast Response ◽  
Correction Method ◽  
Shock Tunnel ◽  
Test Time ◽  
Correction Coefficient ◽  
Filling Material ◽  
Dynamic Correction ◽  
Detonation Shock ◽  
Measurement Deviation

Robust fast-response transient calorimeters with novel calorimeter elements have attracted the attention of researchers as new synthetic materials have been developed. This sensor uses diamonds as the calorimeter element, and a platinum film resistance is sputtered on the back to measure the temperature. The surface heat flux is obtained based on the calorimetric principle. The sensor has the advantages of high sensitivity and not being prone to erosion. However, non-ideal conditions, such as heat dissipation from the calorimeter element to the surroundings, can lead to measurement deviation and result in challenges for sensor miniaturization. In this study, a novel transient calorimeter (NTC) with two different sizes was developed using air or epoxy as the back-filling material. Numerical simulations were conducted to explain the complex heat exchange between the calorimeter element and its surroundings, which showed that it deviated from the assumption of an ideal calorimeter sensor. Accordingly, a dynamic correction method was proposed to compensate for the energy loss from the backside of the calorimeter element. The numerical results showed that the dynamic correction method significantly improved the measurement deviation, and the relative error was within 2.3% if the test time was smaller than 12 ms in the simulated cases. Detonation shock tunnel experiments confirmed the results of the dynamic correction method and demonstrated a practical method to obtain the dynamic correction coefficient. The accuracy and feasibility of the dynamic correction method were verified in a single detonation shock tunnel and under shock tube conditions. The NTC calorimeter exhibited good repeatability in all experiments.

scholarly journals Towards distortion-free imaging of the eye

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0252876
Author(s):  
Phillip Bedggood ◽  
Andrew Metha
Keyword(s):  
Imaging System ◽  
Linear Equations ◽  
Correction Method ◽  
Dynamic Correction ◽  
Optical Components ◽  
Ocular Imaging ◽  
Simultaneous Linear Equations ◽  
Multiple Frames ◽  
The Common ◽  
Static Distortion

The high power of the eye and optical components used to image it result in “static” distortion, remaining constant across acquired retinal images. In addition, raster-based systems sample points or lines of the image over time, suffering from “dynamic” distortion due to the constant motion of the eye. We recently described an algorithm which corrects for the latter problem but is entirely blind to the former. Here, we describe a new procedure termed “DIOS” (Dewarp Image by Oblique Shift) to remove static distortion of arbitrary type. Much like the dynamic correction method, it relies on locating the same tissue in multiple frames acquired as the eye moves through different gaze positions. Here, the resultant maps of pixel displacement are used to form a sparse system of simultaneous linear equations whose solution gives the common warp seen by all frames. We show that the method successfully handles torsional movement of the eye. We also show that the output of the previously described dynamic correction procedure may be used as input for this new procedure, recovering an image of the tissue that is, in principle, a faithful replica free of any type of distortion. The method could be extended beyond ocular imaging, to any kind of imaging system in which the image can move or be made to move across the detector.

Osteotomy for Correction of Premature Growth Plate Closure in 24 Dogs

1994 ◽  
Vol 07 (03) ◽  
pp. 129-135 ◽  
Author(s):  
C.W. Miller ◽  
P.W. Morgan
Keyword(s):  
Corrective Osteotomy ◽  
Functional Results ◽  
Degenerative Joint Disease ◽  
Joint Disease ◽  
Angular Deformity ◽  
Dynamic Correction ◽  
Age At Surgery ◽  
Limb Deformities ◽  
The Mean ◽  
A Prospective Study

SummaryTwenty-four dogs (27 limbs) were evaluated after surgery for correction of forelimb angular limb deformities. Partial ulnar ostectomies or definitive corrective osteotomies were performed depending upon the age of the dog. According to owner assessment nine of fourteen limbs were considered functionally good, or excellent, after partial ulnar ostectomies. Younger dogs appeared to have better functional results after dynamic correction with the mean age at surgery of dogs with good to excellent results being 6.5 months contrasted to the mean age at surgery of dogs with fair to poor results being 9.75 months. Ten of fourteen limbs were considered functionally good or excellent after definitive corrective osteotomy. One dog had definitive osteotomy after partial ulnar ostectomy in order to further correct a residual angular deformity. However, 58% of the limbs with radiographic follow-up had signs of degenerative joint disease (DJD). There were not significant differences between neither degree of angulation remaining after surgery and the functional result nor the degree of angulation remaining after surgery and the development of DJD. A prospective study is warranted to more objectively assess the efficacy of surgical correction of angular limb deformities in dogs.Twenty-four dogs were evaluated after surgery for correction of forelimb angular limb deformities. The results are described.

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