Development of a New Technique for Measuring Volume Change of Dry Particulate Systems Under Very Low Confining Pressures

2000 ◽  
Author(s):  
Ali I. Abdel-Hadi ◽  
N. D. Cristescu ◽  
O. Cazacu ◽  
Ray A. Bucklin
Keyword(s):  
Volume Change ◽  
Flow Behavior ◽  
New Technique ◽  
Triaxial Tests ◽  
Accurate Information ◽  
Confining Stress ◽  
Confining Pressures ◽  
A New Technique ◽  
Cross Calibration ◽  
Particulate Systems

Abstract A new technique has been developed to measure volume change at very low confining pressures. Such low confining stress levels may be experienced in typical powder technology applications (storage and transport of particulate systems). The aim of this technique is to obtain more accurate information on the deformation, failure and flow behavior of cohesive powders under a variety of loading conditions and deformation rates. The technique allows covering the entire pressure regime that is covered by commercially available and industrially applied powder flow testers. It bridges the gap of multiple devices, whose ranges of test conditions do not overlap, thus facilitating cross-calibration of equipment and increases confidence (and reliability) of all compaction data obtained. The investigation of the effect of initial porosity on powder flowability was chosen to test the new experimental setup. In particular, triaxial tests have been carried out on samples of different particulate systems and the results have been presented at different confining pressures and on samples of different initial porosities.

scholarly journals Effect of Geotextile Reinforcement on Shear Strength of Sandy Soil: Laboratory Study

2016 ◽  
Vol 38 (4) ◽  
pp. 3-13 ◽  
Author(s):  
Sidali Denine ◽  
Noureddine Della ◽  
Muhammed Rawaz Dlawar ◽  
Feia Sadok ◽  
Jean Canou ◽  
...  
Keyword(s):  
Shear Strength ◽  
Mechanical Behaviour ◽  
Confining Pressure ◽  
Triaxial Tests ◽  
Loose Sand ◽  
Test Results ◽  
Compression Tests ◽  
Confining Stress ◽  
Natural Sand ◽  
Confining Pressures

Abstract This paper presents results of a series of undrained monotonic compression tests on loose sand reinforced with geotextile mainly to study the effect of confining stress on the mechanical behaviour of geotextile reinforced sand. The triaxial tests were performed on reconstituted specimens of dry natural sand prepared at loose relative density (Dr = 30%) with and without geotextile layers and consolidated to three levels of confining pressures 50, 100 and 200 kPa, where different numbers and different arrangements of reinforcement layers were placed at different heights of the specimens (0, 1 and 2 layers). The behaviour of test specimens was presented and discussed. Test results showed that geotextile inclusion improves the mechanical behaviour of sand, a significant increase in the shear strength and cohesion value is obtained by adding up layers of reinforcement. Also, the results indicate that the strength ratio is more pronounced for samples which were subjected to low value of confining pressure. The obtained results reveal that high value of confining pressure can restrict the sand shear dilatancy and the more effect of reinforcement efficiently.

scholarly journals Design and development of text extraction and retrieval using style of documents in web searching

2017 ◽  
Vol 7 (1.2) ◽  
pp. 130
Author(s):  
S. Balan ◽  
P. Ponmuthuramalingam
Keyword(s):  
Search Engine ◽  
New Technique ◽  
Accurate Information ◽  
Web Pages ◽  
Web Searching ◽  
Retrieval Performance ◽  
Design And Development ◽  
Query Result ◽  
Text Information ◽  
A New Technique

This research focuses on study and extraction of web pages and documents are returned from goggle search engine. The useful task of web is to exactly match the accurate information. That information are categorized into many ways such as manual, structured, semi-structured texts and images. Query Result Records (QRR’s) is used to extract the text information from the different type of documents. Data region is used to identify the actual segmentation step and the domain of documents contains suffix and prefix. Time compared to the existing pruning and other techniques are more efficient in manner. We analyze the different type of alignments in this paper and propose a new technique for alignment retrieval to find precision and recall evaluating the retrieval performance.

Effect of End Restraint on High Pressure Tests of Granular Materials

1971 ◽  
Vol 8 (4) ◽  
pp. 579-588 ◽  
Author(s):  
M. Roy ◽  
K. Y. Lo
Keyword(s):  
High Pressure ◽  
Granular Materials ◽  
Volume Change ◽  
Triaxial Tests ◽  
Stress Strain ◽  
End Conditions ◽  
Pressure Tests ◽  
Confining Pressures ◽  
End Restraint ◽  
Distribution Of Stress

Comparative drained triaxial tests at high confining pressures were carried out on a strong- and weak-grained granular material with 'rough' and 'lubricated' ends. The results indicated that the stress-strain relationships are significantly influenced by the end conditions. The use of 'lubricated' ends for high pressure tests results in much more uniform distribution of stress, strain, volume change, and crushing of particles throughout the samples.

scholarly journals Multi-year observations of Breiðamerkurjökull, a marine-terminating glacier in southeastern Iceland, using terrestrial radar interferometry

2015 ◽  
Vol 61 (225) ◽  
pp. 42-54 ◽  
Author(s):  
Denis Voytenko ◽  
Timothy H. Dixon ◽  
Ian M. Howat ◽  
Noel Gourmelen ◽  
Chad Lembke ◽  
...  
Keyword(s):  
Volume Change ◽  
Radar Interferometry ◽  
New Technique ◽  
High Current ◽  
Lagoon Water ◽  
A New Technique ◽  
Observation Period

AbstractTerrestrial radar interferometry (TRI) is a new technique for studying ice motion and volume change of glaciers. TRI is especially useful for temporally and spatially dense measurements of highly dynamic glacial termini. We conducted a TRI survey of Breiðamerkurjökull, a marine-terminating glacier in Iceland, imaging its terminus near the end of the melt season in 2011, 2012 and 2013. The ice velocities were as high as 5 m d−1, with the fastest velocities near the calving front. Retreat of the glacier over the 3 year observation period was accompanied by strong embayment formation. Iceberg tracking with the radar shows high current velocities near the embayment, probably indicating strong meltwater outflow and mixing with relatively warm lagoon water.

A new technique for the mapping of oxygen tension on the brain surface

2005 ◽  
Vol 25 (1_suppl) ◽  
pp. S543-S543
Author(s):  
Satoshi Kimura ◽  
Keigo Matsumoto ◽  
Yoshio Imahori ◽  
Katsuyoshi Mineura ◽  
Toshiyuki Itoh
Keyword(s):  
Oxygen Tension ◽  
New Technique ◽  
Brain Surface ◽  
A New Technique ◽  
The Brain
Sign in / Sign up

Export Citation Format

Share Document