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はじめに ・川端 敏之3) ・石 磊石 4) An Experimental Evaluation on Rate Sensitivity of Absorption Energy Evaluated by Measurement of J-integral in Austenitic Stainless SteelTakeshi Iwamoto, Shin-ya HasHImoto, Toshiyuki Kawabata and Leishi sHI Synopsis : Austenitic stainless steel is widely used in important industries since it has excellent mechanical and chemical properties such as anti-corrosion, high ductility and high strength. In the past, it was reported that its extremely high energy absorption can be measured by the Charpy impact test. The mechanism of its energy absorption characteristic is still unclear and its rate sensitivity has not been discussed. In the present study, a rate sensitivity of energy absorption characteristic of austenitic stainless steel will be discussed experimentally by measuring J-integral under 3-point bending condition for a wide range of displacement rate. In the experiment, the direct current potential difference method is employed for sensing an onset of a stable crack extension. As a result, the positive rate sensitivity on the energy absorption can be observed and high energy absorption can be achieved by the high ductility of the steel.

Heat evolution during the microbial degradation of glucose in soil was measured with a multiplex heat-conduction calorimeter in the presence of mercury, cadmium, selenium and iodoacetic acid as pollutants. Effects of the pollutant concentration on the degradation thermograms were compared and the results implied that each pollutant had a different type of inhibitory effect on the degradation process of glucose in soil. The dependence of peak times on the thermogramson the pollutant concentration was quantitatively analyzed with a simple mathematical model and possible parameters describing the inhibitory effect of each substance were presented.Calorimetric studies on microbial systems have been carried out by manyworkers and the methodology seems to have now been almost established.1~4)The methods are thought to be one of the potential tools for microbiological studies, especially in the quantitative analysis of microbial growth.5)

The dielectric function spectra of TlGaS 2 crystal with quasitwo-dimensional layered structure have been studied by means of spectroscopic elipsometry over the photon range 1.5-6.0 eV in the temperature range 100-400 K. The absolute values of the dielectric function show a sudden temperature-induced change around 180 and 280 K. The energy of the inter-band optical transitions retrieved from the dielectric function spectra display an abrupt temperature change around the same temperatures. Structural phase transitions are behind the observed change of electronic band structure of TlGaS 2 . Original Paper room temperature. The origin of CPs were assigned within the electronic band structure obtained from calculations based on density functional theory [9]. 1256 Y. Shim et al.: Temperature behavior of dielectric function spectra in TlGaS 2