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Neutron irradiation on Nb3Sn wire changes its superconducting properties. It is well known that the critical current increases by the irradiation once and then decreases by further irradiation. In this paper, the effective upper critical magnetic field and the critical temperature of the irradiated Nb3Sn wire were investigated, and the mechanism that causes such changes were discussed qualitatively by focusing on the role of the irradiation defects together with the normal metallurgical flaws. In addition, a critical surface was taken up and the general tendency of the change in the surface was discussed.

On the 29th of September, 1950, immediately after 8 o'clock in the morning, a very large landslide occurred in the valley of the Göta River in the southwest of Sweden. The site of the slide is located on the east bank of the river in a village named Surte, about 15 km from the mouth of the river in Kattegat, near Göteborg (Gothenburg). Geologically this province can briefly be characterized by archaean rock hills with Quaternary clay between them. The area which slipped has a width of about 400 m (parallel to the river) and a length of about 600 m, and the volume of the slide can be estimated at 4 million m3. The bank of the river had practically no height, and within a distance of about 200 m from the river the terrain was practically horizontal. Beyond that the terrain had a slope varying from 1:30 to 1:6. The slope was steepest in the northeast part of the slide area. An extensive field investigation was made in the area of the slide and in the adjacent regions. This investigation consisted in taking samples mainly by means of the soil sampler with metal foils and the piston sampler, soundings, vane tests, and measurements of the pore water pressure.

On the 29th of September, 1950, immediately after 8 o'clock in the morning, a very large landslide occurred in the valley of the Göta River in the southwest of Sweden. The site of the slide is located on the east bank of the river in a village named Surte, about 15 km from the mouth of the river in Kattegat, near Göteborg (Gothenburg). Geologically this province can briefly be characterized by archaean rock hills with Quaternary clay between them. The area which slipped has a width of about 400 m (parallel to the river) and a length of about 600 m, and the volume of the slide can be estimated at 4 million m3. The bank of the river had practically no height, and within a distance of about 200 m from the river the terrain was practically horizontal. Beyond that the terrain had a slope varying from 1:30 to 1:6. The slope was steepest in the northeast part of the slide area. An extensive field investigation was made in the area of the slide and in the adjacent regions. This investigation consisted in taking samples mainly by means of the soil sampler with metal foils and the piston sampler, soundings, vane tests, and measurements of the pore water pressure.

We present the analysis of the genetic model of autocatalytic chemical reactions proposed by Arnold et al. This model, when subjected to multiplicative white noise modelling environmental fluctuations, can undergo a sudden change from a unimodal state to a bimodal one, while no such transition occurs if the noise is absent. Here, this noise-induced transition is studied analytically by investigating the so-called critical surface in the three-dimensional parameter space