Since wave energy represents a large and mainly untapped energy source, with a theoretical resource estimated at circa 2.1 TW, integrating wave energy converters (WECs) into seaports’ breakwaters has gained increasing interest in the field of coastal engineering. As key contributors to the economy of nations with access to the ocean, seaports are important infrastructures built to provide adequate sheltering conditions for moored ships. Consequently, the power production of the hybrid WEC was found to be less dependent on the wave’s characteristics.ĭue to a growing concern regarding environmental sustainability, increasing CO 2 emissions and the struggle to meet renewable energy production targets, the need for new, innovative and more efficient ways to harness clean and renewable energy arises. The chosen concepts were found to complement each other: the OWEC was more efficient for the lower wave periods tested and the OWC for the higher. It was demonstrated that hybridization could lead to systems with higher efficiencies than its individual components, for a broader range of wave conditions. The wave power captured by the hybrid WEC was calculated and the performance of the two harvesting principles discussed. Before the experimental tests, the device’s performance was numerically optimized using ANSYS Fluent and WOPSim v3.11. The present work analyzes the performance of an innovative hybrid WEC module combining an oscillating water column (OWC) and an overtopping device (OWEC) integrated into a rubble mound breakwater, based on results of a physical model study carried out at a geometrical scale of 1:50. As a result, there has been a rising interest in integrating wave energy converters (WEC) into the breakwaters of seaports. We demonstrate that microcalcifications can be detected at full spatial resolution using the super-resolution ultrasound imaging and wave-equation reflection imaging methods.Seaports are highly energy demanding infrastructures and are exposed to wave energy, which is an abundant resource and largely unexploited. We construct numerical breast phantoms using in vivo breast images, and use a finite-difference wave-equation scheme to generate ultrasound data scattered from inclusions that mimic microcalcifications. Wave-equation reflection imaging employs a solution to the acoustic-wave equation in heterogeneous media to backpropagate ultrasound scattering/diffraction waves to scatters and form images of heterogeneities. Super-resolution imaging uses the singular value decomposition and a factorization scheme to achieve an image resolution that more » is not possible for conventional ultrasound imaging. We explore the capabilities of a novel super-resolution ultrasound imaging method and a wave-equation reflection imaging scheme for detecting breast microcalcifications. In addition, wave-equation reflection imaging has become an effective method to reduce image speckles by properly handling ultrasound scattering/diffraction from breast heterogeneities during image reconstruction. Super-resolution imaging with the factorization method has recently been developed as a promising tool to break through the resolution limit of conventional imaging. Ultrasound image resolution and quality need to be significantly improved for breast microcalcification detection. (LLNL), Livermore, CA (United States) Sponsoring Org.: USDOE Office of Science (SC), Basic Energy Sciences (BES) USDOE National Nuclear Security Administration (NNSA) OSTI Identifier: 1477328 Alternate Identifier(s): OSTI ID: 1491649 Report Number(s): LLNL-JRNL-716119 Journal ID: ISSN 0016-8033 ark:/13030/qt23j167v6 Grant/Contract Number: AC02-05CH11231 AC52-07NA27344 Resource Type: Accepted Manuscript Journal Name: Geophysics Additional Journal Information: Journal Volume: 83 Journal Issue: 4 Journal ID: ISSN 0016-8033 Publisher: Society of Exploration Geophysicists Country of Publication: United States Language: English Subject: 58 GEOSCIENCES modeling case history surface wave Geosciences (LBNL), Berkeley, CA (United States) Lawrence Livermore National Lab. Publication Date: Wed May 30 00:00: Research Org.: Lawrence Berkeley National Lab. Berkeley Seismological Lab., Berkeley, CA (United States).of California, Berkeley, CA (United States) of California, Berkeley, CA (United States) Lawrence Livermore National Lab.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |