Calcareous peloids in the north-western Arabian Sea: implications of late Quaternary marine sedimentation and paleoclimate

Dev, Vikas; Pathak, Vishwesh Kumar; Dey, Rahul; Mazumder, Madhurima; Kumar, Ajai; Das, Saubhik

doi:10.1007/s12517-021-08652-5

Cited by 3 publications

(1 citation statement)

References 52 publications

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“…However, this measure is not scale-invariant, is very sensitive to small irregularities, and is sensitive to the resolution [ 10 ]. To address these drawbacks, some other methods have been proposed, such as radius ratio (RR) [ 11 ], which calculates the ratio between the minimum and maximum radius of the object, or the mean circularity (MR) [ 11 , 12 ], where the average radius from the border points is needed. Even though these two methods improve the previous one, their use is intended for cases with regular objects, and in cases where there is partial information about the object or abrupt variations in the shape, these measurements are not very reliable.…”

Section: Introductionmentioning

confidence: 99%

Distortion Calculation Method Based on Image Processing for Automobile Lateral Mirrors

et al. 2022

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The automobile lateral-view mirrors are the most important visual support for driver safety; therefore, it is important they have robust quality control. Typically, the distortion of a lateral-view mirror is measured using the JIS-D-5705 standard; however, this methodology requires an expert person to perform the measurements and calculations manually, which can induce measurement errors. In this work, a semi-automatic distortion calculation method based on image processing is presented. Distortion calculations of five commercial mirrors from different manufacturers were performed, and a comparative study was carried out between the JIS-D-5705 standard and the proposed method. Experimental results performed according to the JIS-D-5705 standard showed that all mirrors have a distortion lower than 5%, indicating that all meet the standard. On the other hand, the proposed method was able to detect that one of the mirrors presented an important distortion, which was not detected by the methodology proposed in the standard; therefore, that mirror should not meet the standard. Then, it was possible to conclude that the proposed distortion calculation method, based on image processing, has higher robustness and precision than the standard. In addition, an appropriate and effective behavior against changes in scale, resolution, and, unlike the standard, against changes in image rotation was also shown.

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Section: Introductionmentioning

confidence: 99%

Distortion Calculation Method Based on Image Processing for Automobile Lateral Mirrors

et al. 2022

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Paleoclimatic Influence on the Evolution of the Late Quaternary Clastic Sediments, Northwestern Arabian Sea

Dev,

Sahu,

Kumar

et al. 2023

Journal of the Geological Society of India

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Sedimentological characteristics of the clastic sediments deposited in the Northwestern Arabian Sea at the ODP core sites 723A and 722B are used to reconstruct the paleoclimatic changes recorded during the last 150 kyrs. ODP site 723A is situated at 808 m water depth on the continental margin of Oman, whereas ODP site 722B is located at 2028 m water depth on the Owen Ridge. Clay minerals such as palygorskite, illite, chlorite, smectite, kaolinite, and non-clay minerals, quartz and feldspar, are present in both cores. However, palygorskite and illite dominated the clay mineral assemblage at core 723A, and illite dominated over palygorskite in the clay mineral assemblage at core 722B. Illites are dominantly well crystalline, with slightly poorer crystallinity occurring during Holocene and inter-glacial stages. Chemically illites are Mg-rich with slightly Al-rich illites associated with aforesaid stages. The higher values of all moisture-clay based humidity tools (ratios of kaolinite/ illite, kaolinite/chlorite, smectite /(illite+chlorite), kaolinite/ palygorskite) are dominantly associated with stronger monsoon based weathering during the interglacial stages, Holocene and interstadial events. The increased total carbonate, elemental concentrations (calcium, barium and phosphorous) and decreased magnetic susceptibility values correlate with the enhanced monsoon intensities during the above events. Glacial stages and millennial-scale drier events (Heinrich, Younger Dryas and stadial events) are marked by the massive influx of wind borne terrigenous material, dominated by clay minerals with higher silicon and aluminium contents; they have increased sediment accumulation rates at both sites. The clay proxies and other sedimentological data demonstrate monsoonal oscillations at 40, 23, 6.3, 4.4 and 3.5kyr cycles in Milankovitch and sub-Milankovitch time scales. The present study suggests that the detritus are mainly eolian and primarily originated from the nearby continental areas of Oman, the Arabian Peninsula, Persian Gulf and Iran-Makran regions. The northwesterly wind played a significant role in sediment transportation into the present sites throughout the studied period. The southwest summer and northeast winter monsoon winds played minor roles in the above activity during the interglacial and glacial stages, respectively. The Indus River discharges (predominantly of glacial origin), although low, have contributed some clay minerals in the deeper water core site.

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The role of active channels in sediment transport to the Bengal Fan and their implications for climate and sediment source changes since 16 ka

Khan,

Liu,

Huang

et al. 2024

Quaternary Science Reviews

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Calcareous peloids in the north-western Arabian Sea: implications of late Quaternary marine sedimentation and paleoclimate

Cited by 3 publications

References 52 publications

Distortion Calculation Method Based on Image Processing for Automobile Lateral Mirrors

Distortion Calculation Method Based on Image Processing for Automobile Lateral Mirrors

Paleoclimatic Influence on the Evolution of the Late Quaternary Clastic Sediments, Northwestern Arabian Sea

The role of active channels in sediment transport to the Bengal Fan and their implications for climate and sediment source changes since 16 ka

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