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Fabrication of AZ31/CNT Surface Nano-composite by Double-pass Friction Stir Processing

Kim J. Y., Hwang J.-W., Kim H. Y., Lee S. M., Jung W.-S., Byeon J.-W.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 2B

1039--1042

Double-pass Friction Stir Processing (FSP) was applied to fabricate an AZ31/CNT nano-composite for surface hardening of lightweight structural components. The effects of double-pass FSP as well as groove depth (i.e., volume fraction of CNT) on the CNT distribution, dynamically recrystallized grain size, and resulting microhardness were studied. Double-pass FSP was performed for the CNT-filled plate-type specimen with different groove depths of 2, 3, and 4 mm. By applying double-pass FSP, the average size of CNT clusters decreased, implying a more homogeneous distribution. Compared with the FSPed specimen without CNT, grain size was refined from 19 μm to 3 μm and microhardness increased from 52 Hv to 83 Hv (i.e., 71% increase).

The Development of Ship Watch Keeping Supporting Aids

Im N., Kim E. K., Han S. H., Jeong J. S., Lee S. M.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2013

Vol. 7, no. 4

501--506

This study deals with the development of ship watch keeping supporting aids that will be useful for ship deck officers in recognizing navigational harmful obstacles such as sea marks and small floating objects on the sea. The developed watch keeping supporting aids is made up of four components; a composite video sensor to produce video signal, a laser distance measuring part, a Pan/Tilt part and a central control part. The system was installed in a ship in order to verify its performance of the recognition ability on the sea. The comparison was made between the recognition ability of the system and that of watch keeping deck officers’. The image from the watch keeping supporting system was found to be more recognizable than that of a binocular telescope within a 5 km distance. The newly suggested system is expected to be used to recognize small dangerous floating objects more easily when navigation deck officers have a duty of watch keeping for navigation especially near harbor area.

Reaction mechanism study using total kinetic energy and prescission particle multiplicity in medium mass nuclei

Yuasa-Nakagawa K., Nakagawa T., Yoshida K., Liu X., Lee S. M., Jiang D. X., Aoki Y., Kasagi J., Furutaka K.

Nukleonika

1998

Vol. 43, nr 3

281-290

We measured γ-ray multiplicity and light charged particle (LCP) multiplicity simultaneously in coincidence with binary decay fragments in the reaction of (sup 84)Kr + (sup 27)Al at the incident energy of 8.5 MeV/nucleon. We observed the prescission LCP multiplicities and total kinetic energy (TKE) of heavy fragments as a function of the angular momentum of the system applying the measured γ-ray multiplicity as an angular momentum filter. For this reaction the fusion-fission process seems to occur dominantly only at the angular momentum ∼ 70ħ which is concluded from the dependence of prescission proton multiplicity on the TKE. The charge distribution of binary decay fragments changes from the symmetric mass division to asymmetric one with increasing the γ-ray multiplicity.

Zmierzono jednocześnie krotności kwantów γ i lekkich cząstek naładowanych w koincydencji z fragmentami binarnego rozpadu w reakcji (sup 84)Kr + (sup 27)Al przy energii pierwotnej 8.5 MeV/nukleon. Wyznaczono krotności cząstek naładowanych i całkowitą energię kinetyczną ciężkich fragmentów w funkcji momentu pędu układu, wykorzystując zmierzoną krotność kwantów γ jako filtr momentu pędu. W przypadku rozważanej reakcji process fusion-fission wydaje się występować głównie przy momencie pędu ∼ 70ħ, co wywnioskowano z zależności krotności protonów pre-scission od całkowitej energii kinetycznej. Rozkład ładunku fragmentów zmienia się wraz ze zwiększającą się krotnością kwantów γ od podziału symetrycznego do asymetrycznego.