This paper proposes a new technique of hypervelocity impact testing method using a shaped charge. For the development of a bumper to protect spacecrafts from space debris impact, hypervelocity impact testing has been studied. The speed of conical shaped charge jet tip is over 10 kmEsec-1 , but trailing jets and slug are needless for impact testing. To remove the needless matters from the shaped charge, the inhibitor method and defense plate system were tested and its effectiveness and problems were identified.

On the spontaneous ignition of NC, the effect of water and oxygen and that of nitrogen dioxide and oxygen were investigated by observing the thermal behavior and structural change. As the result, it was observed that hardly any exothermic degradation took place only by nitrogen dioxide nor water; hardly any exothermic degradation took place in atmospheres without oxygen. From this, it was suggested that exothermic degradation was due to oxygen and it was promoted by nitrogen dioxide and water. The results indicated that auto-oxidation caused by atmospheric oxygen could explain the spontaneous ignition mechanism of NC.

Ultrasonic measurement method for linear burning rate advocated by The French National Aerospace Research Establishment iONERAjwas improved significantly.

Not measuring the propagation time of the ultrasonic wave, but taking full advantage of the Wavelet Analysis on the data of the reflection wave from the burning surface, this new method brought success in extraction of burning rate from the Doppler-shifted wave (up to 100mm long propellant sample) even with unspecialized chamber. Further, instability study using this Doppler Method is possible because the burning rate is an instantaneous one.

To clarify the detonability and the performance of precompressed emulsion explosives, the detonation velocity was measured. Three types of microballoon or micro bubble were used as sensitizers for the sample emulsion explosives. The underwater explosion test was carried out to load dynamic pressure into the sample explosives. The result indicates that the decrease of detonation velocity in the sample explosives sensitized by glass microballoons was larger than that of detonation velocity in the sample explosives sensitized by resin microballoons or chemical gas bubbles. The detonability of precompressed emulsion explosive was also investigated on the initiation sensitivity test using the weak-strength detonators. It is concluded that the recovery of the detonability occurred rapidly in the sample explosives sensitized by resin microballoons and chemical gas bubbles. However, a long period was needed for the recovery of detonability in the sample explosives sensitized by glass microballoons.

We isolated and identified a pseudomonad strain named as Pseudomonas sp. strain TM15 from soils in Yamada Green Zone, Kitakyushu City where 2, 4, 6-trinitrotoluene (TNT) specifically has been detected. This strain can efficiently biotransform TNT in comparison with other isolating bacteria. TNT was converted to two kinds of mono-amino-dinitrotoluene, 2-amino-4, 6-dinitrotoluene and 4-amino-2, 6-dinitrotoluene, further to benzoate and catechol. Based on the extinction of the absorbance derived from aromatic ring (260`280nm), this bacterium was finally expected to cleavage the ring of TNT. The results of umu test using the bioluminescent bacterium showed that the genotoxicity from TNT was eliminated by Pseudomonas sp. strain TM15.

Explosives have shared a large part for development and maintenance of our society. The works that consumed explosives for destroying rocks and constructions are called blasting. Main purpose of the traditional way of blasting is that blasting works get the most out of energy of explosives and burst a large amount rocks efficiently. However, the environment around blasting work sites changes with the times, and the phenomena like vibration, noise, fly rocks and falling by blasting operations became objects of public concern. So, main purpose of blasting became eco-friendly such as controlled blasting and release blasting. Theses blasting methods are not analyzed sufficiently yet. If the chemical energy of explosives becomes to be controlled freely by us, control methods will promote more effective use of explosives, and will develop bigger market of blasting. In this paper, control blasting has been discussed from points of view of using different kinds of explosives and different charge methods, and good results obtained by the field test are described.