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Ceballos J.A.C.,The University of ManchesterManchester | Ozanyan K.B.,The University of ManchesterManchester
6th World Congress in Industrial Process Tomography | Year: 2010

Tomography imaging of industrial subjects requires compliance with a particular environment. This results in severe limitations on the access and the deployable hardware resources, defining the situation of imaging by systems with limited resources, to be addressed by the future generations of imagers. This means that faster and more economic implementations of data acquisition and image reconstruction are called for, enabled by the latest software and hardware developments and system design.Particular emphasis is given to THz Tomography from limited views and the potential of the recently introduced method of sinogram restoration by sinusoidal Hough transform (HT), which has been demonstrated up-to-date only as a sequential algorithm, but is amenable to parallel computation. Possible strategies for its deployment on distributed unutilized resources in a multi-FPGA system are also discussed, including fast centre-of-mass detection, without solving the standard inverse Radon transform.This contribution offers a review of the approaches and methods for implementation of parallel and distributed computing for the needs of Tomography, particularly when the efficient use of dedicated resources is a priority, e.g in the case of embedded Tomography systems. We envisage generic hardware which can be configured as a multiprocessor environment, programmable to implement data acquisition, reconstruction and visualisation. The state of the art is examined and issues are highlighted from a computer science perspective, as well as from the point of view of current progress in available hardware and recent trends in reconstruction methods amenable to parallelisation. © 2014 International Society for Industrial Process Tomography. Source

Zhang X.,Beijing University of Technology | Huang T.,Beijing University of Technology | Yang W.,Beijing University of Technology | Xiao R.,Beijing University of Technology | And 2 more authors.
Journal of Materials Processing Technology | Year: 2016

Laser beam welding of a newly developed AA2060 aluminum–lithium (Al-Li) alloy was performed with AlSi12 filler wire. The fusion zone (FZ) consisted of dendritic solidification structure with the LiAlSi and CuAl2 phases and a small quantity of Mg2Si phase at the dendritic and grain boundaries, reducing the precipitation ability in the interior of grains. The microhardness was decreased in the FZ, being 90–120 HV0.1, compared to the based material (BM), being 152 HV0.1, and the variation was consistent with local strength across the joint. The joint transverse tensile strength was 416 MPa and the elongation was 1.2%. The presence of grain boundary phases caused the fracture mode varied from a low–energy intergranular fracture in the FZ to a high–energy transgranular fracture in the BM. The formation of LiAlSi phases in the weld metal, resulting from the addition of Si, helped increase the tensile strength of the joints. The AA2060 Al-Li alloy is considered weldable due to the over 80% tensile strength of BM in laser beam welding, which readily meets most applications. © 2016 Elsevier B.V. Source

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