We study the stability of the isometry group against quantum fluctuations. In the case of M4 x S3 we calculate the effective potential for the conformally coupled scalar fields including the squashed parameter. The results at one-loop level show that a round sphere is unstable against the deformation. This induces the symmetry breaking S0(4)+ SU(2) x U(1).

A type 329J1 duplex stainless steel was welded by gas tungsten arc welding in argon-nitrogen gas mixture atmospheres. The penetration depth of weld metal increased with an increase of the nitrogen partial pressure of atmosphere. No porosity was observed in the weld metals. The nitrogen content and microstructure of the weld metal were studied. The nitrogen content increased and the ferrite content decreased with an increase of the nitrogen partial pressure of atmosphere. The ferrite content decreased linearly with an increase of nitrogen content. Fine chromium nitride precipitates were

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