scholarly journals Downslope sound propagation measurements in a laboratory scale model of the Santa Lucia escarpment

1994 ◽  
Vol 95 (5) ◽  
pp. 2908-2908
Author(s):  
Stewart A. L. Glegg ◽  
Robert Coulson ◽  
Anthony Le Vigne
Keyword(s):  
Sound Propagation ◽  
Laboratory Scale ◽  
Scale Model

scholarly journals Scaling for lobe and cleft patterns in particle-laden gravity currents

2013 ◽  
Vol 20 (1) ◽  
pp. 121-130 ◽  
Author(s):  
A. Jackson ◽  
B. Turnbull ◽  
R. Munro
Keyword(s):  
Granular Material ◽  
Froude Number ◽  
Particle Diameter ◽  
Granular Flows ◽  
Leading Edge ◽  
Air Entrainment ◽  
Gravity Currents ◽  
Laboratory Scale ◽  
Scale Model ◽  
Snow Avalanches

Abstract. Lobe and cleft patterns are frequently observed at the leading edge of gravity currents, including non-Boussinesq particle-laden currents such as powder snow avalanches. Despite the importance of the instability in driving air entrainment, little is known about its origin or the mechanisms behind its development. In this paper we seek to gain a better understanding of these mechanisms from a laboratory scale model of powder snow avalanches using lightweight granular material. The instability mechanisms in these flows appear to be a combination of those found in both homogeneous Boussinesq gravity currents and unsuspended granular flows, with the size of the granular particles playing a central role in determining the wavelength of the lobe and cleft pattern. When scaled by particle diameter a relationship between the Froude number and the wavelength of the lobe and cleft pattern is found, where the wavelength increases monotonically with the Froude number.

scholarly journals Identification of a Suitable Solid Carrier as a Matrix for the Permeable Reactive Barrier of Laboratory Scale Model Aquifer for Atrazine Degradation

1970 ◽  
Vol 25 (1) ◽  
pp. 119-128 ◽  
Author(s):  
Binita K Shrestha ◽  
Pawan Raj Shakya ◽  
MIM Soares
Keyword(s):  
Laboratory Scale ◽  
Permeable Reactive Barrier ◽  
Scale Model ◽  
Pseudomonas Sp ◽  
Reactive Barrier ◽  
Solid Carrier ◽  
Different Types ◽  
Simultaneous Loss ◽  
Static Conditions ◽  
Atrazine Degradation

Three different types of physical substrata such as sand, granualar activated carbon (GAC) and plastic macaroni beads were selected to identify a suitable solid carrier as a course matrix for the permeable reactive barrier (PRB) in a sand filled two-dimensional laboratory-scale model aquifer. An adhesion experiment was performed and tested with Pseudomonas sp ADP (PASP) under agitated as well as static conditions. In static conditions, adhesion to GAC was the highest (80%) followed by that to beads (60%). No adhesion to sand was observed under static or agitated conditions. Since atrazine is adsorbed by GAC, its bioavailability for degradation by PADP may be affected. To test this, simultaneous loss of atrazine and release of chloride (dechlorination, the first step in the pathway of atrazine degradation by PADP) were determined in the presence and absence of GAC. Although cells remained viable, no significant chloride release was detected. Thus, plastic macaroni beads were identified and selected as the most suitable support for PADP in the biological permeable reactive barrier (BPRB) of the model aquifer.Key words: Suitable Solid; Laboratory Scale; PADPTribhuvan University JournalVol. XXV, No. 1, 2005Page:119-128Uploaded date: 26, September, 2010

A scale model experiment for the study of sound propagation in urban areas

2001 ◽  
Vol 62 (3) ◽  
pp. 327-340 ◽  
Author(s):  
J. Picaut ◽  
L. Simon
Keyword(s):  
Urban Areas ◽  
Model Experiment ◽  
Sound Propagation ◽  
Scale Model

scholarly journals First results of pipe pile static load test in small laboratory scale

2018 ◽  
Vol 251 ◽  
pp. 04038 ◽  
Author(s):  
Michal Baca ◽  
Jaroslaw Rybak
Keyword(s):  
Static Load ◽  
Axial Loading ◽  
Laboratory Scale ◽  
Load Test ◽  
Scale Model ◽  
Small Scale ◽  
Small Laboratory ◽  
Static Load Test ◽  
First Results ◽  
Load Tests

Presented laboratory testing program of tubular steel piles is a part of a bigger research program which contained static load tests in full scale and numerical simulations of conducted research. The main goal of the research is to compare static load tests with different working conditions of a shaft. The presented small scale model tests are the last part of the research. The paper contains the testing methodology description and first results of model pile axial loading. The static load tests in a small laboratory scale were conducted in a container filled with uniformly compacted medium sand (MSa). The first results of the investigation are presented in this paper, with the comparison of two pile capacities obtained for different roughness of the pile shaft (skin friction). The results are presented as load-displacement curves obtained by means of the Brinch-Hansen 80% method.

scholarly journals Laboratory-scale model of carbon dioxide deposition for soil stabilisation

2016 ◽  
Vol 8 (2) ◽  
pp. 178-186 ◽  
Author(s):  
Mohammad Hamed Fasihnikoutalab ◽  
Afshin Asadi ◽  
Bujang Kim Huat ◽  
Paul Westgate ◽  
Richard J. Ball ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Laboratory Scale ◽  
Scale Model ◽  
Soil Stabilisation
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