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7 articles for “longitudinal waves”
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Acoustic Logging Methods in Fractured and Porous Formations
Abstract: Abstract Formation fractures have significant importance in the rocks’ permeability of oil and gas reservoirs. In real conditions, the opening of vertical fractures exceeds the opening of horizontal fractures and the permeability of reservoirs in conditions of horizontal wells is higher than in vertical conditions. For the sonic log longitudinal waves, unlike the transverse waves, the attenuation rate strongly depends on the wave path direction. It is shown that the …
Published in Journal of Offshore Structure and Technology · Vol. 4, Issue 2, 2017 · pp. 28–35 Read article
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Utilizing Machine Learning to Evaluate the Connection between Poisson's Ratio and the Petrophysical Properties of Reservoir Rocks
Abstract: The Poisson's ratio is a crucial cornerstone, illuminating our understanding of geomechanical behaviour in wells during the dynamic drilling process and the inspiring recovery journey. This research rigorously employs machine learning methods to analyse the significant impact of geophysical parameters on the Poisson ratio in hydrocarbon reservoirs found in oil fields. The analysis utilized data from multiple oil and gas fields, highlighting the crucial relationships between the Poisson ratio, the …
Published in Journal of Petroleum Engineering & Technology · Vol. 15, Issue 2, 2025 · pp. 33–43 Read article
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Study of Elastic Properties of Copper Substituted Nickel – Zinc Nano Ferrites Through IR-Spectroscopy
Abstract: Nano crystalline Ni 0.65 Zn 0.35 Cu x Fe (2-2x/3) O 4, (x ranging from 0 – 0.05 in steps of 0.01) ferrites synthesized via hydrothermal route are characterized by FTIR spectroscopy. IR spectra of prepared ferrites demonstrated the two fingerprint absorption bands of spinels in the range of 400-600 cm-1. Lattice constant, X-ray density values obtained from XRD patterns used for evaluating the tetrahedral site and octahedral site force …
Published in Nano Trends – A Journal of Nano Technology & Its Applications · Vol. 25, Issue 2, 2023 · pp. 1–12 Read article
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Near-Surface Seismic Refraction Tomography; a case study for geotechnical application
Abstract: Usually, among geophysical techniques, seismic refraction methods are used to investigate near surface geology for engineering purposes. In these study physical parameters, longitudinal seismic wave velocities were used to characterize the shallow subsurface layers for geotechnical application. The physical response of subsurface materials varies as the structure, porosity, fluid saturation, composition and tie-up vary. These variations primarily viewed in the first arrival time of seismic waves. With the necessary steps, …
Published in Journal of Geotechnical Engineering · Vol. 6, Issue 2, 2019 · pp. 18–26 Read article
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Comparative Study on Fatigue Analysis Methods using Turret-moored FPSO Model
Abstract: Abstract Floating structures are prone to fatigue due to high cyclic loads mainly caused by waves and changing loading conditions. Therefore, fatigue is an important criterion during design. The fatigue life is dependent upon factors such as global and local design, workmanship during construction, maintenance, corrosion protection, and trade and load history. Different approaches are applied to the fatigue strength assessment. Longitudinal stiffener end connections are also important structural elements …
Published in Journal of Offshore Structure and Technology · Vol. 3, Issue 3, 2016 · pp. 1–15 Read article
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Fatigue Assessment of Longitudinal Stiffener End Connections for Ageing Tankers
Abstract: Abstract The world tanker fleet is ageing. In this situation it is essential to ensure that the transportation of oil and gas is carried out by quality vessels. This is possible with old tankers as long as their condition can be properly assessed. Since the 80’s relatively few new-buildings have been ordered and this has opened for operation of tankers up to 30 years of age. Ship and offshore structures …
Published in Journal of Offshore Structure and Technology · Vol. 3, Issue 1, 2016 · pp. 1–12 Read article
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From Documentation to Digital Stewardship: A Bibliometric Analysis of the Technological Transformation in Indigenous Knowledge Management
Abstract: This bibliometric study systematically maps the technological evolution of Indigenous Knowledge Management (IKM) over a 30-year period (1995–2025). It aims to identify the conceptual shifts and emerging technologies defining the transition from passive digital documentation to active algorithmic stewardship. The study utilises a scientometric approach to analyse a corpus of 835 unique documents retrieved from the Scopus database. Scientific-mapping techniques, including thematic evolution and keyword co-occurrence analysis, were performed using …
Published in Journal of Advancements in Library Sciences · Vol. 13, Issue 3, 2026 Read article