نتایج جستجو برای: zero dimensional sigma frames
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We consider 2d sigma models with a D = 2 + N dimensional Minkowski signature target space metric having a covariantly constant null Killing vector. These models are UV finite. The 2 +N -dimensional target space metric can be explicitly determined for a class of supersymmetric sigma models with N -dimensional ‘transverse’ part of the target space being homogeneous Kähler. The corresponding ‘tran...
The bacterial rpoN operon codes for sigma 54, which is the key sigma factor that, under nitrogen starvation conditions, activates the transcription of genes needed to assimilate ammonia and glutamate. The rpoN operon contains several other open reading frames that are cotranscribed with sigma 54. The product of one of these, the 17.9 kDa protein IIANtr, is homologous to IIA proteins of the phos...
In this article, topology optimization of two-dimensional (2D) building frames subjected to seismic loading is performed using the polygonal finite element method. Artificial ground motion accelerograms compatible with the design response spectrum of ASCE 7-16 are generated for the response history dynamic analysis needed in the optimization. The mean compliance of structure is minimized as a t...
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