Abstract
s Summary Among many nominated papers, five technical papers have been published in this volume. However, there are excellent papers in the unselected ones, some of them, hereafter, are summarized for readers reference. Research on Combustion of Marine Heavy Fuels (Differential Thermal Analysis and Droplet Burning) By Takashi Mineyana and Nobuyuki Awai An experimental research is performed to clarify the combustion characteristics of the present bunker fuels by the methods mentioned above subtitle. The sample fuels are several kinds of base oils taken out from the conventional and some recent refiner process, these mixture oils on trail and several bunker fuels in practical use. The main result are showed as fol1ows: (1) The thermal analysis makes possible to predict the original components of bunker fuels by comparing the burning profile with it of the base oil. (2) Two correlation formulas on droplet burning were obtained by the method of multple regression analysis. The ignition lag and the burning rate on droplet burring are able to be predicted by these formulas. (3) The sample fuels are able to be classified by the characteristic component on the diagram between the ignition lag and the burning rate. (4) On the same diagram, bunker fuels which were reported troubles happened in use, are distributed the characteristic range. The recent low grade bunker fuels have caused to increase troubles on combustion in the marine diesel engines. Troubles on combustion are able to be predicted by adapting the analysis result above mentioned to these low grade bunker fuels. ―― Reprinted from Journal of the MESJ, Vo1. 24. No.1 ――Deep Submergence Vehicle By Hideyuki Morihana, Nobuhiko Watanabe The features of the new Japanese two deep submergence vehicles are presented. Shinkai 6500, a manmed research submergence vehicle for Japan Marine Science and Technology Center (JAMSTEC), is being built by MHI Kobe shipyard. The vehicle can dive to 6500m deep and explore the s1opes of trenches around Japan. That is very important to the geophysical study of the deep ocean floors. The vehicle is small in size and light in weight and has advanced capability in research and observation system, comparing to the predecessor Shinkai 2000. MARCAS 2500, a remotely operated vehicle, was built by MHI Kobe shipyard and delivered to Kokusai Denshin Denwa. Co., Ltd. (KDD) in 1987. The vehicle can dive to 2500m deep and operate for the construction and maintenance of under water communication cables. ―― Reprinted from Journal of the MESJ. Vo1. 24. No.2 ―― (58) Bulletin of the M.E.S.J., Vol. 18, No.1
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