Winning Over the Production Threat: An Innovative Petrophysical Approach for Sand Grain Size Prediction and Rock Strength Evaluation

2020 ◽  
Author(s):  
Siti Najmi Farhan Zulkipli ◽  
Zurita Johar
Keyword(s):  
Grain Size ◽  
Rock Strength ◽  
Strength Evaluation ◽  
Sand Grain Size

Influence of sand grain size and nest microenvironment on incubation success, hatchling morphology and locomotion performance of green turtles (Chelonia mydas) at the Chagar Hutang Turtle Sanctuary, Redang Island, Malaysia

2018 ◽  
Vol 66 (6) ◽  
pp. 356 ◽  
Author(s):  
Taylor A. Stewart ◽  
David T. Booth ◽  
Mohd Uzair Rusli
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Swimming Speed ◽  
Green Turtle ◽  
Chelonia Mydas ◽  
Sand Particle ◽  
Emergence Success ◽  
Sand Grain Size

The nest microenvironment affects hatching and emergence success, sex ratios, morphology, and locomotion performance of hatchling sea turtles. Sand grain size is hypothesised to influence the nest microenvironment, but the influence of sand grain size on incubation of sea turtle eggs has rarely been experimentally tested. At the Chagar Hutang Turtle Sanctuary, Redang Island, Malaysia, green turtle (Chelonia mydas) nests were relocated to sands with different sand grain sizes on a natural beach to assess whether grain size affects nest temperature, oxygen partial pressure inside the nest, incubation success, hatchling morphology and hatchling locomotion performance. Green turtle nests in coarse sand were cooler; however, hatching success, nest emergence success, oxygen partial pressure, incubation length and hatchling size were not influenced by sand particle size. Nests in medium-grained sands were warmest, and hatchlings from these nests were better self-righters but poorer crawlers and swimmers. Hatchling self-righting ability was not correlated with crawling speed or swimming speed, but crawling speed was correlated with swimming speed, with hatchlings typically swimming 1.5–2 times faster than they crawled. Hence, we found that sand particle size had minimal influence on the nest microenvironment and hatchling outcomes.

Laboratory investigation of dune erosion as a function of sand grain size and dune density

1994 ◽  
Vol 23 (1-2) ◽  
pp. 151-165 ◽  
Author(s):  
M.F. Overton ◽  
W.A. Pratikto ◽  
J.C. Lu ◽  
J.S. Fisher
Keyword(s):  
Grain Size ◽  
Laboratory Investigation ◽  
Dune Erosion ◽  
Sand Grain Size

Rock Strength Evaluation during Progressive Failure Process Based on Fractural Characterization

2015 ◽  
Vol 34 (8) ◽  
pp. 759-763 ◽  
Author(s):  
Bin Yu ◽  
Jun Zhao ◽  
Kai Fang ◽  
Yunliang Tan ◽  
Jianguo Ning
Keyword(s):  
Rock Strength ◽  
Progressive Failure ◽  
Failure Process ◽  
Strength Evaluation
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