For powder-bed electron beam additive manufacturing (EBAM), support structures are required when fabricating an overhang to prevent defects such as curling, which is due to the complex thermomechanical process in EBAM. In this study, finite element modeling is developed to simulate the thermomechanical process in EBAM in building overhang part. Thermomechanical characteristics such as thermal g...

Spatially resolved studies of crystalline structures, e.g. lattice spacings, are enabled by recording the transmitted spectra in neutron Bragg edge imaging. The recorded signals are, however, a result through-thickness averaging probed specimen beam direction. Therefore, it is challenging to extract strain distribution when varies across thickness, which applies for on different materials or ma...

In large rivers, complex sediment dynamics cause rapid changes in the position and shape of bed deposits. Regular monitoring of changes in river bed geometry is essential for assessing the nature of morphological change and associated bed load during low, high, and medium flow conditions. We demonstrate the application of Direct Sampling (DS) for patching partial river morphological surveys to ...

Cone-beam SPECT provides improved sensitivity for imaging small organs like the brain and heart. However, current cone-beam tomography with the focal point traversing a planar orbit does not acquire sufficient data to give an accurate reconstruction. In this paper, we employ a data-acquisition method which obtains complete data for cone-beam SPECT by simultaneously rotating the gamma camera and...

the effect of tillage (conventional and zero tillage), crop establishment (raised-bed and flat-bed), and weed management practices (herbicide alone and integrated approach) was studied on productivity, profitability, nutrient uptake and physico-chemical properties of soil in soybean–wheat cropping system, at new delhi during 2010–2012. sixteen treatment combinations consisting of four tillage a...

Habitat mapping, physical characteristics and benthic community of a rhodolith bed in the Pelagie Islands (Strait Sicily, Mediterranean Sea) were studied through Multi–Beam Echo–Sounder (MBES), Remotely Operated Vehicle (ROV) grab samples. The geomorphological analysis revealed an articulated wide bed; video inspections highlighted with high coverage, few sandy patches prevalence boxwork morpho...

Abstract The microstructure and mechanical properties of additively manufactured (AM) parts have been shown to be different from that cast wrought counterparts. In this study, electron beam powder bed fusion (EB-PBF) fabricated Alloy 718 was exposed three heat treatment routes followed by strain-controlled fatigue testing at 550 °C. tests were performed with specimens built their center axis pa...