In many cases, frozen whale meat in the Japanese market is prepared before rigor mortis (pre-rigor). A serious problem for frozen whale meat is the occurrence of thaw rigor, which is the strong development of rigor mortis during thawing. To prepare frozen whale meat without thaw rigor and maintain a high meat pH, the temporal changes in adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide (NAD) contents of frozen meat stored at -2.5, -5.0, -7.5, and -10°C were investigated. The rate of decrease of ATP was higher than that of NAD at all storage temperatures. ATP nearly disappeared after holding the meat at -2.5°C for a few days; however, NAD existed yet, so pH decreased thereafter. ATP levels were maintained for a long period at a temperature of -5.0 to -10°C, resulting in the occurrence of thaw rigor. Compared to the muscles of fish such as tuna, the rates of decrease of ATP and NAD were extremely slow in whale meat.
室温磁気冷凍技術は高効率な次世代ノンフロン型空調冷凍技術として注目されているが，一部の用途を除き実用に耐えうる冷凍能力の実現には至っていない．本研究では磁気冷凍機の冷凍能力向上を目指し，Active Magnetic Regenerator に則った冷凍サイクルの改良に着目した．数値計算から得られる冷凍能力を目的変数とし，山登り法を用いて室温磁気冷凍機における最適な冷凍サイクルを，冷凍温度幅とAMR 寸法が異なる複数の場合について探索した．その結果，磁気冷凍機で一般的に用いられることが多いブレイトンサイクルとエリクソンサイクルを複合した冷凍サイクルを用いた場合に高い冷凍能力が得られることがわかった．
The effect of pre-treatment at subzero temperature of grains on the grinding process was investigated in respect of physical properties of particle. The average particle size of ground soybean and black soybean powders decreased as pre-treatment temperature decreased. The theoretical model that described grinding characteristics revealed that the freezing as pre-treatment is effective on grinding process. In all grain samples, the Bond’s constant and work index showed lower values as the pretreatment temperature decreased. The scanning electron microscopy was used for observation of surface damages on the particles by grinding process. Some cracks were seen on the surface of particles of soybean powder ground with freezing pretreatment. On the other hand, the particles of black soybean powder showed no fractures. The freezing as pre-treatment of grains prior to grinding process is effective to controlling their grinding characteristics and microstructure damages.