Byounghee Kim, Sinwoo Song, Euicheong Hwang, Kyoungdyuk Rho,
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Recently, the weapon systems are more and more complex and the demands for handling and maintaining these complex systems effectively are increased. For this reason, industrial control network had been developed for many years and the needs for the development of a totally networked automation environment are raised. To meet these requirements, networked motion control systems tend more and more to replace the traditional solutions. In this paper, the XY platform motion control system employing RTEX (Real Time Express) network which is one of the Ethernet based vender-oriented industrial networks is tackled. The network motion controller which generates motion profile and outputs the pulse train is implemented and is
applied to XY platform. As results, it is shown that the proposed network motion controller works properly to control the XY platform and monitors the system easily through network.
Despite being highly bioactive and biocompatible, some of the limitations like poor fracture toughness, lack of electrical conductivity and antimicrobial properties restrict the use of monolith hydroxyapatite (HA) as bone replacement material. In this paper, we address one such issue and will demonstrate how CaTiO3 (CT) addition enhances physical properties like strength, fracture toughness etc. Therefore, the strategy in the current research is to develop dense HA-CT biocomposites using innovative multi-stage spark plasma sintering (MSSPS) technique (at 50 MPa, 1200oC, 5 min), that can mimic the function and properties close to that of natural bone. Fine scale microstructural characterization using TEM reveals the presence of twins in CaTiO3 grains and the grain size of HA is around 1-2 μm. Phase analysis using x-ray diffraction analysis revealed an absence of α and β-tricalcium phosphate (Ca3(PO4)2) or CaO phase which is also supported by Fourier transformed infra-red spectroscopy. Elastic modulus of 46-135 GPA is obtained using nanoindentation. Based on the available empirical models, it has been observed that the experimentally measured density hardness, and elastic modulus match reasonably well with that of the natural cortical bone.
This article reflects an investigation into the use of passive protection against the fire based on the concept
of fireproofing. The use of this technique obeys to international standards especially the 2218 API used as
reference in order to achieve the purposes of this approach; Indeed the present study attests to the
methodology of the fireproofing used at the complex "Ourhoud" and to the identified discrepancies at some
of its installations and this in comparison to the recommendations of the standard and the requirements of
the safety philosophy of this project.
The aim of this study is to investigate the reasons of the discrepancies in results of modal analysis due to Finite Element (FE) simulation and inaccuracies in Experimental Modal Analysis (EMA) for an asymmetric structure. An asymmetric structure with 87 stitch welds is simulated, tested and correlated. As the initial FE-EMA correlation showed frequency differences of over 24%, an optimization model is developed for the model to bring FE results close to EMA. FE optimization is performed with each weld modeled as a separate component which led to FE-EMA frequency difference reduced from over 24% to about 10%. The sources of error in FEA were identified as non-incorporation of manufacturing deviations such as efficacy of the welds, changes in stiffness due to changes in microstructure of Heat Affected Zone (HAZ), dimensional tolerances of components in assembly and variation of sheet thickness across the model.
Dulitha K. Hewadikaram, Hasith E. Perera, Deshitha C. Wickramrathna,
Mudhitha Bandara, Amal N. Pattivedana, Hiran H.E. Jayaweera, Janaka
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Frequency dependence of the tissue backscatters provides useful information about the tissue structure. Further, it has been found that structure of tissue changes due to different diseases and these alterations cause observable changes in acoustic scattering properties. Several parameters have been developed to identify these alterations and tissue identification. This study has introduced a new tissue characterization parameter, which is Full width at half maximum (FWHM) of the fitted Gaussian curve of the Fast furrier transformed back scattered signal and it has been used to identify two different tissue samples; bovine liver and chicken liver. The experiment was carried out for nine bovines and nine chicken livers and FWHM of the chicken liver 3.72±0.16 was greater than that of bovine liver 3.28±0.16 (p=2.91E-05). Hence, it can be concluded that the bovine liver and the chicken liver can be differentiate using the FWHM parameter.