Modification method of seepage parameters for rough fractures based on digital image technique

2021 ◽  
pp. 109967
Author(s):  
Lei Gan ◽  
Guanyun Chen ◽  
Zhenzhong Shen ◽  
Liqun Xu ◽  
Wenbing Zhang
Keyword(s):  
Digital Image ◽  
Modification Method ◽  
Image Technique

Use of digital image technique to study leachate penetration in biocemented residual soil

2021 ◽  
Author(s):  
Muttaqa Uba Zango ◽  
Khairul Anuar Kassim ◽  
Radzuan Sa'ari ◽  
Mohd Fadhli Abd Rashid ◽  
Abubakar Sadiq Muhammed ◽  
...  
Keyword(s):  
Digital Image ◽  
Residual Soil ◽  
Image Technique

Ash Deposit Shedding during Co-combustion of Coal and Rice Hull Using a Digital Image Technique in a Pilot-Scale Furnace

2013 ◽  
Vol 27 (11) ◽  
pp. 7126-7137 ◽  
Author(s):  
Hao Zhou ◽  
Hailong Zhang ◽  
Letian Li ◽  
Bin Zhou
Keyword(s):  
Digital Image ◽  
Pilot Scale ◽  
Rice Hull ◽  
Image Technique ◽  
Ash Deposit

scholarly journals Efficiency of a Digital Particle Image Velocimetry (DPIV) Method for Monitoring the Surface Velocity of Hyper-Concentrated Flows

Geosciences ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 383 ◽  
Author(s):  
Donatella Termini ◽  
Alice Di Leonardo
Keyword(s):  
Particle Image Velocimetry ◽  
Digital Image ◽  
Particle Image ◽  
Estimation Error ◽  
Digital Particle Image Velocimetry ◽  
Velocity Estimation ◽  
Surface Velocity ◽  
Image Velocimetry ◽  
Image Technique ◽  
Interrogation Area

Digital particle image velocimetry records high resolution images and allows the identification of the position of points in different time instants. This paper explores the efficiency of the digital image-technique for remote monitoring of surface velocity and discharge measurement in hyper-concentrated flow by the way of laboratory experiment. One of the challenges in the application of the image-technique is the evaluation of the error in estimating surface velocity. The error quantification is complex because it depends on many factors characterizing either the experimental conditions or/and the processing algorithm. In the present work, attention is devoted to the estimation error due either to the acquisition time or to the size of the sub-images (interrogation areas) to be correlated. The analysis is conducted with the aid of data collected in a scale laboratory flume constructed at the Hydraulic laboratory of the Department of Civil, Environmental, Aerospace and of Materials Engineering (DICAM)—University of Palermo (Italy) and the image processing is carried out by the help of the PivLab algorithm in Matlab. The obtained results confirm that the number of frames used in processing procedure strongly affects the values of surface velocity; the estimation error decreases as the number of frames increases. The size of the interrogation area also exerts an important role in the flow velocity estimation. For the examined case, a reduction of the size of the interrogation area of one half compared to its original size has allowed us to obtain low values of the velocity estimation error. Results also demonstrate the ability of the digital image-technique to estimate the discharge at given cross-sections. The values of the discharge estimated by applying the digital image-technique downstream of the inflow sections by using the aforementioned size of the interrogation area compares well with those measured.

A NUMERICAL AND EXPERIMENTAL INVESTIGATION OF COALESCENCE BETWEEN CYLINDRICAL HOLES

2014 ◽  
Vol 38 (1) ◽  
pp. 93-106 ◽  
Author(s):  
Joel S. Griffin ◽  
Clifford J. Butcher ◽  
Zengtao Chen
Keyword(s):  
Finite Element Analysis ◽  
Experimental Investigation ◽  
Digital Image ◽  
Micromechanical Model ◽  
Image Correlation ◽  
Far Field ◽  
Element Analysis ◽  
Cylindrical Holes ◽  
Image Technique ◽  
Local Work

A sequential digital image technique was employed to detect the onset of coalescence between pairs of holes in tensile specimens. The coalescence event was induced between cylindrical holes that were positioned with various spacing and ligament orientations. Using finite-element analysis as a framework, the coalescence predictions of a classic micromechanical model were compared with the experimental coalescence results. It was found that the predicted strains at coalescence could be significantly improved by accounting for local work-hardening in the ligament region between the two holes. Digital image correlation was used to extract strain values from the digital image record, for both the far-field and the intervoid ligament.

Evaluation and Measurement Method for Texture Depth of Exposed-Aggregate Cement Concrete Pavement Surface Based on Digital Imaging Technique

2011 ◽  
Vol 460-461 ◽  
pp. 66-70
Author(s):  
Chen Ning
Keyword(s):  
Digital Image ◽  
Surface Texture ◽  
Measurement Method ◽  
Dimensional Space ◽  
Concrete Pavement ◽  
Least Square ◽  
Cement Concrete ◽  
Pavement Surface ◽  
Cement Concrete Pavement ◽  
Image Technique

In order to study the surface characteristics of exposed-aggregate cement concrete pavement, the measurement mechanism of surface texture depth was analyzed by using digital image technique. Based on the principle of least square and Table curve 3D software, two-dimensional digital image of road surface was reconstructed into three-dimensional space surface and a method of evaluating and measuring pavement surface texture depth was put forward. With this method， digital image samples were calculated and the results were compared with the results of conventional measurement method. The results indicate that exposed-aggregate cement concrete pavement has excellent road characteristics; there is a good correlation between the digital image technique and the traditional sand patch method and the relative error is less than 7 percent. Thus, the digital image technique is feasible in evaluating and measuring pavement surface texture depth.

Sign in / Sign up

Export Citation Format

Share Document