Article
Engineering, Mechanical
Christopher W. Barney, Matthew E. Helgeson, Megan T. Valentine
Summary: In this study, the bulk modulus of silicone blends with variable crosslinking density and sol fraction was investigated using radially confined compression. The results showed that the bulk modulus is systematically altered when changing the network structure. This finding provides a deeper understanding of the connection between bulk modulus and molecular structure of nearly incompressible polymer networks.
EXTREME MECHANICS LETTERS
(2022)
Article
Engineering, Geological
Sannith Kumar Thota, Toan Duc Cao, Farshid Vahedifard
Summary: The paper introduces the concept of Poisson's ratio characteristic curve (PRCC) to establish the relationship between Poisson's ratio and degree of saturation. Through calibration and validation, the proposed model can accurately predict the behavior of soils, leading to more accurate assessments in geotechnical engineering applications.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Mai-Linh Doan, Jade Dutilleul, Pierre Henry
Summary: Using logging data and samples from expeditions, we determined porosity and sonic velocity profiles in the Nankai margin. The decrease in porosity with depth suggests hydrostatic conditions in the borehole. We improved the velocity-porosity relationship and predicted velocity profiles at Site C0002.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Muhammad Raiees Amjad, Muhsan Ehsan, Muyyassar Hussain, Nadhir Al-Ansari, Abdul Rehman, Zohaib Naseer, Muhammad Nauman Ejaz, Rafik Baouche, Ahmed Elbeltagi
Summary: The quality of carbonate reservoirs is heavily influenced by processes such as compaction, cementation, and dissolution during sediment burial. Porosity and pore pressure, directly affected by mechanical and chemical compactions, are the main factors. Changes in reservoir quality are observed in response to variable sediment influx caused by molasse sediment deposition resulting from the Himalayan orogeny. This study aims to analyze the variations in carbonate reservoir quality induced by compaction and variable sediment influx using the Sakesar Limestone in the Potwar Basin as a case study. The analysis includes porosity computation from log and seismic data, which indicate 2-4% porosities in the Sakesar Limestone and a sharp decrease in porosity values during the Miocene times.
Article
Geochemistry & Geophysics
S. Yabe, Y. Hamada, M. Kitamura, R. Fukuchi, Y. Hashimoto
Summary: The empirical relationship between porosity and P-wave velocity is a useful tool for probing underground physical properties and stress states. In this study conducted in the Nankai Trough in Japan, different porosity-velocity relationships were identified based on analysis of core samples and logging data, and the factors influencing these relationships were determined.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Polymer Science
Chunhao Yang, Wuning Ma, Zhendong Zhang, Jianlin Zhong
Summary: This study investigates the low-velocity impact response of sandwich plates with negative Poisson's ratio (NPR) auxetic honeycomb core and functionally graded carbon nanotubes reinforced composite (FG-CNTRC) face sheets. The effects of various factors, such as gradient forms of FG-CNTRC surfaces, volume fractions of CNTs, impact velocities, and temperatures, on the response of the sandwich plates are analyzed using theoretical and numerical methods.
Article
Physics, Multidisciplinary
Aditya Gaur, Komal Chawla, Raj Kiran, Satyanarayan Patel
Summary: Menger sponges with square, circular and hexagonal-shaped cavities of different orders were studied for their elastic modulus, Poisson's ratio, thermal conductivity and electrical conductivity as a function of density. The results showed that Poisson's ratio, thermal conductivity and electrical conductivity decreased with decreasing effective density. The mechanical and electrical behavior of the Menger sponges varied with different cavity shapes after the effective density fell below 0.8. The Menger sponge with a square cavity showed the largest decrement in thermal and electrical conductivity with increasing order of structure. The Menger sponge with a hexagonal cavity had the least reduction in normalized thermal and electrical conductivity with decreasing effective density. These structures have potential applications in medical, aerospace, and industrial fields according to the specific requirements.
Article
Optics
K. Mariselvam
Summary: Ytterbium-doped barium lithium fluoroborate (BLFB) glasses were studied for nuclear radiation shielding applications, with increasing Yb content leading to higher density, refractive index, and lower molar volume. Among all the glasses, 2YbBLFB glass demonstrated the best gamma-ray shielding properties.
Article
Materials Science, Multidisciplinary
Shu-liang Cheng, Hong-yun Yang, Cong Geng, Qian Ding, Qun Yan, Yong-tao Sun, Ya-jun Xin, Liang Wang, Jin-xin Xu
Summary: This paper investigates the impact dynamic response of a sinusoidal honeycomb sandwich panel with negative Poisson's ratio, highlighting its superior performance over traditional honeycomb panels. The study identifies three stages of impact process and finds that the amplitude and velocity directly influence the impact resistance and energy absorption capacity of the sinusoidal honeycomb structure. The findings provide valuable insights for the design of structures with enhanced impact resistance.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Engineering, Marine
Xiao-ling Zhang, Bing-jie Zhang, Wen-Xi Zhang, Yan Han
Summary: Under dynamic cyclic loads, the pore water pressure in saturated sand continuously increases, leading to a decrease in horizontal bearing capacity or damage to pile foundations. Traditional calculation methods for horizontal bearing capacity of pile foundations often overestimate the soil resistance around the pile and underestimate the pile-soil relative displacement. Therefore, this study proposes theoretical formulas related to pore pressure ratio and cyclic vibration times, and introduces them into the dynamic p-y curve model to obtain the dynamic p-y backbone curve during sand liquefaction.
Article
Engineering, Geological
Jinqiao Zhao, Qiang Ou, Xuanming Ding, Zhixiong Chen
Summary: Vibroflotation without backfill is an effective method for treating hydraulic dredged coral sand foundation. Model tests were conducted to compare four construction variables of vibroflotation, and the dynamic responses of excess pore pressure and horizontal earth pressure were analyzed. The results showed that the shallow layer is prone to liquefaction with double-point vibroflotation, while single-point vibroflotation provides a more uniform distribution of excess pore pressure. The vibration duration has a significant effect on anti-liquefaction resistance, and excessive vibration processes are unnecessary for densification. Suitable vibration frequency and distance between vibrators enhance the reinforcement effect in the shallow layer.
Article
Energy & Fuels
Pouya Hosseinifar, Hamidreza Shahverdi
Summary: A new predictive method is proposed to construct distillation curves of petroleum fractions using their physical properties, without the need for experimental distillation data. By developing a mathematical model, the characteristic parameters can be accurately determined, showing high agreement with experimental results.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Physical
Changshan Zhou, Hezhi Zhang, Xudong Yuan, Kaikai Song, Dan Liu
Summary: This study validates the applicability of pre-plastic deformation (PPD) on bulk metallic glasses (BMGs) with different Poisson's ratios. It is found that PPD treatment can effectively produce multiple shear bands in BMGs with high Poisson's ratios, leading to improved strength and plasticity. However, for BMGs with low Poisson's ratios, PPD treatment results in only a few shear bands and micro-cracks, leading to worsening mechanical properties. Furthermore, among the PPD-treated BMGs with similar high Poisson's ratios, Zr56Co28Al16 BMG exhibits larger plasticity due to the presence of more defective icosahedral clusters, which serve as nucleation sites for shear transformation zones (STZs) during deformation.
Article
Mechanics
Pengcheng Zhao, Kai Zhang, Cheng Zhao, Zichen Deng
Summary: In this study, the wave propagation characteristics and Poisson's ratio of the Star-3/6 structures were investigated, and their macrostructure performance was predicted using finite element method and Bloch's theorem.
COMPOSITE STRUCTURES
(2021)
Article
Soil Science
R. Horn, H. Fleige, A. Mordhorst, J. Dorner
Summary: Divergent processes in soils affect pore systems and alter hydraulic, gaseous, and thermal fluxes when the internal soil strength is exceeded. The study examines stress-strain and pore water pressure data from arable top and subsoil horizons to evaluate the linkage between changes in effective stress and soil structure. Results indicate that the soil deformation behavior is influenced by precompression stress and calculated effective stresses, while anthropogenic impacts also affect structure properties.
SOIL & TILLAGE RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Sarada P. Mohanty
GEOLOGICAL JOURNAL
(2020)
Article
Environmental Sciences
Niladri Bhattacharjee, Sarada Prasad Mohanty
ENVIRONMENTAL EARTH SCIENCES
(2020)
Article
Geography, Physical
Gopal Sharma, Suresh Kannaujiya, P. K. R. Gautam, Ajay Kumar Taloor, P. K. Champatiray, S. Mohanty
Summary: This study in the Himalayas utilized GPS data to analyze crustal motion, revealing variations in movement speeds of the Indian plate across different regions, suggesting potential earthquake risks due to locked fault systems.
QUATERNARY INTERNATIONAL
(2021)
Article
Engineering, Geological
Adarsh Tripathi, Noopur Gupta, Ashok Kumar Singh, Sarada P. Mohanty, Nachiketa Rai, Anindya Pain
Summary: Experimental investigations on the effects of elevated temperature on Barakar sandstone from the Jharia coalfield in India showed that thermal damage predominantly occurred in zone II, where rapid increase in crack density, porosity, and reduction in seismic wave velocities and mechanical properties were observed. The changes are attributed to thermal stress-induced micro-cracks, evaporation of organic matters, and mineral dehydration and decomposition.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Prasanta Kumar Mishra, Sarada Prasad Mohanty
Summary: The chemogenic sediments of the Chilpi Group in the Bastar Craton have been analyzed for sedimentary environment, geochemistry, and redox evaluation of seawater towards the end of the Paleoproterozoic Era. The presence of reducing conditions in the shallow sea towards the late Paleoproterozoic Era indicates a suboxic to anoxic environment, unaffected by the Great Oxidation Event. The evaluation of multielement concentration suggests minimal effects of detrital contamination, diagenesis, metamorphism, and hydrothermal contributions, with a preservation of pristine marine nature of the carbonates.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Sk. Shamim, Prosanta Kumar Khan, Sarada P. Mohanty, Manoranjan Mohanty
Summary: The Andaman-Nicobar-Sumatra subduction margin has a complex geological structure with the presence of multiple regional faults between the volcanic arc, fore-arc basin, and trench, causing deformation of lithospheric plates. The observed negative gravity anomaly in the margin's gravity model may be associated with a fore-arc shear fault above fractured oceanic crust with a thick sedimentary layer, located in an area of sharp bending of the converging Indian lithosphere in the fore-arc basin.
SURVEYS IN GEOPHYSICS
(2021)
Article
Geosciences, Multidisciplinary
Prosanta Kumar Khan, Sarada P. Mohanty, Partha P. Chakraborty, Rashmi Singh
Summary: Analyzing the increase in seismic activity in northwest India, particularly around the Delhi-National Capital Region and adjacent NW Himalayan front, researchers have observed a moderate-to-low b-values trend since 2016, indicating a stabilization of the stress field in the region. The study also identified a structurally guided stress field between the Kachchh and NW Himalaya regions, coinciding with the direction of Indian plate convergence, and highlighted frequent occurrences of earthquakes in the Delhi, Kangra, and Uttarkashi areas. Additionally, the research proposes that faults in western Peninsular India act as stress guides, concentrating and increasing stress in regions of lithospheric flexure, potentially triggering a large earthquake.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Sarada P. Mohanty
Summary: The Bastar Craton is a key geological formation in Peninsular India, formed during the Paleoarchean Era and experiencing multiple orogenic events. Eventually amalgamating with the Bundelkhand Craton, it preserves sedimentary and metamorphic rocks from different periods, as well as early mineralization patterns, providing important insights into the evolution of the ocean and atmospheric conditions in the early Earth.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geochemistry & Geophysics
Sarada Prasad Mohanty, Prasanta Kumar Mishra
Summary: The Chilpi Group in the Bastar Craton, deposited after the Great Oxidation Event, provides valuable information about the redox state of the ocean and atmospheric oxygen content during a crucial period in Earth's history. The analysis of ironstones in the Chilpi Group indicates the presence of chamosite, greenalite, and siderite, suggesting a shallow sea environment. Geochemical analyses reveal high concentrations of Fe2O3total and SiO2 in iron-rich bands, while trace elements show good correlation with total REE concentration. The study also suggests a dysoxic to suboxic-anoxic condition in the depositional basin.
Article
Environmental Sciences
Swakangkha Ghosh, George Philip, Anup K. Prasad, Tajdarul H. Syed, Sarada P. Mohanty
Summary: With the increasing availability of high-resolution satellite data and the rapid development of Geographic Information System (GIS) technology, the mapping of active faults and quantification of tectonic activity in inaccessible regions has greatly improved. This study examined the tectonic activity in the Trans-Yamuna region of the NW Himalaya using geomorphic indices derived from a Digital Elevation Model (DEM). The results suggest that the majority of the region is tectonically active, with upliftment continuing to occur in the north of the Main Boundary Thrust (MBT).
GEOCARTO INTERNATIONAL
(2023)
Article
Geology
Sarada P. Mohanty
Summary: The Satpura Mountain Belt in Central India has undergone two phases of evolution, with evidence of basement-involved fold structures and deformation of the upper and lower crust. A tectonic model is proposed to explain the formation of the mountain belt through subduction-collision events and erosion.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Prasanta Kumar Mishra, Sarada Prasad Mohanty, Debadutta Mohanty, Mrinal Kanti Mukherjee
Summary: The concentration of phosphorus in seawater is important for marine productivity and life evolution. By studying the P/Fe ratio in iron-ore rocks and iron oxide-rich sediments, we can estimate the phosphorus concentration in seawater. In this study, we evaluated the P/Fe ratios of iron-rich rocks from the late Palaeoproterozoic Chilpi Group in Central India, and found that the phosphorus concentration during this period was low. This low phosphorus concentration may have hindered the evolution of eukaryotes due to reduced primary productivity caused by low atmospheric oxygen content.
GEOLOGICAL MAGAZINE
(2023)
Article
Materials Science, Multidisciplinary
Sarada P. Mohanty, Prasanta K. Mishra
Summary: The iron-rich rocks in Central India provide insights into the redox state of the depositional basin, as well as the formation temperature and oxygen levels. Additionally, the formation requirements for the rare mineral assemblage of magnetite-greenalite-cronstedtite are examined, suggesting a significant decrease in atmospheric oxygen content after a major oxidation event.
PHYSICS AND CHEMISTRY OF MINERALS
(2023)
Article
Geosciences, Multidisciplinary
Siba Sundar Sahu, Sarada P. Mohanty
Summary: Morphometric analysis of the Wagad Highland in the Kachchh province of India revealed three major orientations of regional fractures. The intensity of neotectonic activity decreases from Class 1 to Class 4, with about 62% of the total area falling into Class 1 and Class 2, especially in the western part of the study area. A major NE-SW lineament passing through the center of the study area was identified as being more neotectonically active based on these classes.
JOURNAL OF EARTH SYSTEM SCIENCE
(2021)
Article
Geochemistry & Geophysics
S. Nath, R. S. Chatterjee, S. P. Mohanty, A. Sharma, A. Prasad
Summary: This study used remote sensing data and topographic data to extract lineaments in the Himalayan region, and determined the principal stress directions in different structural domains based on angular distribution and internal friction angles. The study showed good agreement between the directions of maximum principal stress derived from minor lineaments and GPS data, but significant deviations were found in structural domains affected by post-thrusting strike-slip fault tectonics when comparing major and minor lineaments based principal stress directions.
Article
Geosciences, Multidisciplinary
Weijiao Ma, Jinbu Li, Min Wang
Summary: The petroleum resource assessment obtained from laboratory tests on old core samples tends to underestimate the in situ resources. This study investigates the hydrocarbon loss and restoration by comparing preserved and exposed core samples. It is found that previous studies have severely underestimated the in situ hydrocarbon potential due to factors such as sample crushing and crucible waiting. A new restoration model is proposed to compensate for these losses.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Shaoyun Chen, Yongqiang Yang, Longwei Qiu, Xiaojuan Wang, Erejep Habilaxim
Summary: Quartz cement is an important authigenic mineral in the tight sandstones of the Shaximiao Formation in the Sichuan Basin. This study analyzed the silicon sources of the quartz cement using mineralogical, fluid inclusion, and geochemical data. The results showed that smectite alteration and dissolution of aluminosilicate minerals were the primary sources of silicon for quartz cementation. Contributions from volcanic material hydrolysis and pressure solution were relatively minor. The presence of chlorite films inhibited the development of quartz overgrowths and had minimal impact on reservoir quality.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xing Jian, Ping Guan, Ling Fu, Wei Zhang, Xiaotian Shen, Hanjing Fu, Ling Wang
Summary: This study presents a synthesis of new detrital zircon dating results and published data from the Cenozoic Qaidam basin, revealing the spatiotemporal variation of detrital zircon age populations and supporting models of synchronous deformation in northern Tibet. The study emphasizes the importance of considering textural and sedimentological parameters in zircon provenance interpretations, as well as the need for integrated provenance analysis involving other detritus components.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
A. Peketi, G. Sriram, A. Mazumdar, P. Dewangan, A. Zatale, V. Rajurkar, Gayatri Shirodkar, V. Mahale, V. Yatheesh
Summary: This study investigates 13 submarine seamounts in the southern Andaman volcanic arc and observes evidence of hydrothermal activity in one of the seamounts. The evidence includes plumes rich in dissolved gases, live chemosymbiotic organisms, and the deposition of neoforming minerals. These observations suggest the development of a new hydrothermal field in the least explored Andaman Sea.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Yanxian Zhu, Zhiliang He, Xiaowen Guo, Long Li, Sheng He, Jian Gao, Shuangjian Li, Huili Li
Summary: This study investigates the fluid evolution history of the hydrothermal dolomite reservoir in the Middle Permian Maokou Formation in the Sichuan Basin. The results reveal the diagenetic sequences, mineral origins, salinity history, and pressure evolution using various analytical techniques. The findings provide important insights into the gas charge, escape, and preservation conditions of the reservoir.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Rafaella de Carvalho Antunes, Julia Campos Guerrero, Ricardo Jorge Jahnert
Summary: This study presents a detailed sedimentary model and identifies various sedimentary facies associations in the coquina deposits of the Itapema Formation in the offshore pre-salt Buzios Field of the Santos Basin. These facies associations were primarily influenced by waves and currents and reflect a complex depositional system.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Kang Meng, Tongwei Zhang, Deyong Shao, Xiuyan Liu, Hui Song, Heng Peng
Summary: In this study, an integrated method of measuring optical reflectance and Raman spectroscopy is proposed to accurately determine the thermal maturity of Lower Cambrian shales in South China. The results show that this method is reliable and effective, and it has important implications for analyzing overmature shale.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Mohamed A. K. El-Ghali, Olga Shelukhina, Iftikhar Ahmed Abbasi, Mohamed S. H. Moustafa, Osman Salad Hersi, Numair A. Siddiqui, Khalid Al-Ramadan, Abdullah Alqubalee, Abdulwahab Muhammad Bello, Abduljamiu O. Amao
Summary: This study employs an integrated depositional and sequence stratigraphic approach to assess the control of diagenesis on reservoir porosity of a hybrid-energy delta system. The study focuses on the Barik Formation in the Haushi-Huqf region of Central Oman, which represents a highstand system tract of a hybrid-energy delta. The assessments reveal that the reservoir porosity is controlled by various degrees of diagenetic processes, including mechanically infiltrated clays and kaolinitization of silicate grains.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xiaocan Yu, Chunlian Wang, Hua Huang, Kai Yan
Summary: Oilfield brines are a significant alternative lithium resource. This study investigates the metallogenic characteristics and enrichment process of oilfield brines from the Jianghan Basin, central China using chemical and multi-isotope data. The results suggest that lithium enrichment in these brines is the result of interaction with clastic host rocks and dilution by meteoric water.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Jianghao Qiao, Xiwu Luan, Thanuja D. Raveendrasinghe, Yintao Lu, Guozhang Fan, Xinyuan Wei, Long Jin, Jian Yin, Haozhe Ma, Lushan Jiang
Summary: This study investigates the Tanintharyi passive continental margin in the Andaman Sea and reveals the potential of the Oligocene/Early Miocene carbonate platform in the region as a significant hydrocarbon reservoir. It also examines the influence of changes in sedimentary facies and the tectonic setting of the Andaman Sea on the evolution of pockmarks.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Anastasios Nikitas, Georgios Makrodimitras, Maria V. Triantaphyllou, Nikolaos Pasadakis, Kimon Christanis, Stavros Kalaitzidis, Grigoris Rousakis, Ioannis Panagiotopoulos, Alexandra Gogou, Alexandros Papadopoulos, Efthimios Tartaras, Aristofanis Stefatos
Summary: Due to the lack of deep wells in the broader region, studying mud volcanic deposits can improve the geological understanding of the Mediterranean Ridge. In this study, biostratigraphic and geochemical analyses were performed on mud breccia deposits from five Mud Volcanoes in the central MR. The results indicate the origin of these deposits and provide insights into the source rock potential. Seismic data is also used to determine the distribution of major lithostratigraphic formations.
MARINE AND PETROLEUM GEOLOGY
(2024)
