Severe damages will result in human society, when several different critical natural phenomena coincide. One example relates to the resting cysts of Alexandrium species (dinoflagellates that cause paralytic shellfish poisoning), which are preserved in surface sediments throughout Osaka Bay, Japan. These cysts have been found to accumulate particularly densely in shallow areas in the inner parts of Osaka Bay, where a tsunami caused by an earthquake could occur any time. Damage by a tsunami could cause a change of the coastal ecosystems at Osaka Bay including the resuspension of surface sediments containing resting Alexandrium tamarense cysts and the subsequent redistribution of the cysts in newly deposited sediment. Under certain environmental conditions, these cysts could germinate and form dense blooms, leading to paralytic shellfish poisoning. Such a scenario could also affect other coastal areas, including the southern coast of the Korean Peninsula.

We have created new catalogues of AKARI/IRC 2 − 24 μm North Ecliptic Pole Deep survey through new methods of image analysis. In the new catalogues the number of false detection decreased by a factor of 10 and the number of objects detected in multiple bands increased by more than 1,500 compared to the previous work. In this proceedings the new methods of image analysis and the performance of the new catalogues are described.

Nicrophorus concolor Kraatz is a large burying beetle widely distributed in East Asia including Japan, and well known for the habit of burying dead small vertebrates to feed their offspring. Taxonomic research on hististomatid deutonymphs phoretic on this beetle has revealed that they are classified into seven distinct species all new to science, one of which was already described by us under the name Pelzneria uncinata. Now, we give an account of another new species of Pelzneria phoretic on N. concolor in Japan, mainland China and Taiwan. The deutonymphs of the new species are found frequently together with P. uncinata, but, unlike this species, in various, more or less cryptic places on the body surface of the beetle, which indicates that the new species does not show distinct preference of location on the host beetle. The present new species is easily distinguished from the known congeners by hysterosomal dorsum with anterior margin widely and arcuately protruded medially and crenate laterally, unusual forward displacement of dorsal hysterosomal setae d1, notably stout setae f, p and r on tarsus III, extremely long terminal seta e on tarsus IV, and so forth. The feeding stages of this mite are considered to feed on the carcasses of small vertebrates buried by adult N. concolor.

Fabrication of a nano-laminar ceramic composite by sintering thin ceramic plates was examined. Silver-coated glass flakes with a thickness of less than were consolidated by pulsed current sintering or hotpressing to obtain model composites. The samples sintered at the optimum conditions were fairly dense, and the flakes were aligned by uniaxial press. The metal coating remained on the flakes through the sintering process, and became an interface layer between the flakes. No crack propagation through the transverse direction of the lamellar was observed in the indentation test. The possibilities of high resistance against crack propagation was suggested.

Hybrid atomization is a new atomization technique that combines gas atomization with centrifugal atomization. This process can produce fine, spherical powders economically with a mean size of about 10 m diameter and a tight size distribution.

Among powder metallurgy products, complex shaped parts are difficult to be produced. Even i9f it shall be compacted until pet shape, the parts are easily apt to crack. thus it causes inferior productivity.It is present condition that net ahaped parts are obtained by adding after treatment. Clutch hub, pulley, representative partawifh upper 2 steps, tower 3 steps parts are corresponded to the above case. In recent years. muired parts are get to be thinner and thinner, and therefore extremely high compacting techniaues are required. Definition of most preferable com~actingp arts are I) Uniform density 2) Non crack and 3) Realization of net shape or near net shape productlon. For the above purpose, YOSHIZUKA baa developed n now oreas applying hydraulic servo control system.