The water entry of a three-dimensional smooth body into initially calm water is examined. The body can move freely in its 6 d.f. and may also change its shape over time. During the early stage of penetration, the shape of the body is approximated by a surface of double curvature and the radii of curvature may vary over time. Hydrodynamic loads are calculated by the Wagner theory. It is shown that the water entry problem with arbitrary kinematics of the body motion, can be reduced to the vertical entry problem with a modified vertical displacement of the body and an elliptic region of contact between the liquid and the body surface. Low pressure occurrence is determined; this occurrence can precede the appearance of cavitation effects. Hydrodynamic forces are analysed for a rigid ellipsoid entering the water with 3 d.f. Experimental results with an oblique impact of elliptic paraboloid confirm the theoretical findings. The theoretical developments are detailed in this paper, while an application of the model is described in electronic supplementary materials.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4985040 | PMC |
| http://dx.doi.org/10.1098/rspa.2015.0058 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Disaster preparedness kits ready or not? Household resilience to flash flooding in Uttarakhand.
Heliyon
January 2025
Amrita School for Sustainable Futures, Amrita Vishwa Vidyapeetham, Amritapuri Campus, Kerala State, India.
The State of Uttarakhand, located in the Himalayan region of North India, suffered one of the worst flash floods on June 16, 2013 where 5700 were presumed dead or missing. Since then, the region has suffered two other major flooding events in 2021 and 2023. Although numerous national government agencies recommend keeping disaster preparedness kits ready, the saliency and effectiveness of a household disaster preparedness kit in helping survivors, has not been empirically tested in the region.
View Article and Find Full Text PDFA review of the environmental spread of Salmonella enterica serovars through water in Africa.
Lett Appl Microbiol
January 2025
Egg and Poultry Production Safety Research Unit, U.S. Department of Agriculture, Agricultural Research Service, U.S. National Poultry Research Center, Athens, GA, U.S.A.
Salmonella is an enteric pathogenic bacterium in mammals that thrives in sewage, soil, and aquatic environments because of its wide ecological adaptability. The spread of Salmonella infection is associated with a lack of clean water, poor hygiene, and poor sanitation in developing countries. However, the input of Salmonella-contaminated surface water and groundwater in the environmental dissemination of antimicrobial-resistant Salmonella is obscure outside developed countries.
View Article and Find Full Text PDFQM Investigation of Rare Earth Ion Interactions with First Hydration Shell Waters and Protein-Based Coordination Models.
J Phys Chem B
January 2025
Department of Biomedical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States.
Conventional methods for extracting rare earth metals (REMs) from mined mineral ores are inefficient, expensive, and environmentally damaging. Recent discovery of lanmodulin (LanM), a protein that coordinates REMs with high-affinity and selectivity over competing ions, provides inspiration for new REM refinement methods. Here, we used quantum mechanical (QM) methods to investigate trivalent lanthanide cation (Ln) interactions with coordination systems representing bulk solvent water and protein binding sites.
View Article and Find Full Text PDFDevelopment and Application of a Comprehensive Non-targeted Screening Strategy for Fentanyl Analogues.
J Hazard Mater
January 2025
Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610213, China; Key Laboratory of Monitoring and Assessment on Novel Food Raw Materials, State Administration for Market Regulation, Chengdu 611130, China. Electronic address:
The growing abuse of fentanyl and its analogues (FTNs) presents a substantial public health threat, prompting the introduction of regulatory controls by government authorities. Nevertheless, existing screening strategies for FTNs are primarily based on targeted or non-targeted approaches that utilize a limited set of mass spectrometry fragmentation data, which are far from meeting the needs of class scheduling. In this study, a comprehensive non-targeted screening strategy for FTNs was developed.
View Article and Find Full Text PDFEffects of cypermethrin exposure on learning and memory functions and anxiety-like behavior in rats.
BMC Pharmacol Toxicol
January 2025
Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran.
Background: Cypermethrin (CYP), a synthetic pyrethroid widely used to control plant pests, has been associated with various diseases in humans exposed to pesticides, either directly or indirectly. This study aimed to examine the effects of CYP on learning and memory functions, as well as anxiety-like behavior.
Methods: Forty male Wistar rats (8 weeks old) were randomly assigned to 4 groups: The first group served as the control, while the other three groups received different doses of CYP (5, 20, and 80 mg/kg) via gavage once daily for one month.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!