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Exact phase boundaries and topological phase transitions of the XYZ spin chain
, Article Physical Review E ; Volume 96, Issue 1 , 2017 ; 24700045 (ISSN) ; Sharif University of Technology
Abstract
Within the block spin renormalization group, we give a very simple derivation of the exact phase boundaries of the XYZ spin chain. First, we identify the Ising order along ◯ or ŷ as attractive renormalization group fixed points of the Kitaev chain. Then, in a global phase space composed of the anisotropy λ of the XY interaction and the coupling Δ of the Δσzσz interaction, we find that the above fixed points remain attractive in the two-dimesional parameter space. We therefore classify the gapped phases of the XYZ spin chain as: (1) either attracted to the Ising limit of the Kitaev-chain, which in turn is characterized by winding number ±1, depending on whether the Ising order parameter is...
Experimental investigation of poly-β-hydroxybutyrate production by azohydromonas lata: Kinetics and artificial neural network modeling
, Article Chemical Engineering Communications ; Volume 203, Issue 2 , 2016 , Pages 224-235 ; 00986445 (ISSN) ; Younesi, H ; Ardjmand, M ; Safe Kordi, A ; Yaghmaei, S ; Qaderi, H ; Sharif University of Technology
Taylor and Francis Ltd
2016
Abstract
Batch culture of Azohydromonas lata was investigated for the production of intracellular poly-b-hydroxybutyrate (PHB). In order to determine the C:N value of the culture media for maximizing the microbial productivity of PHB, different concentrations of glucose and ammonium chloride were used as carbon and nitrogen sources, respectively. The optimal temperature and shaking rate was obtained at 30_C and 180 rpm, respectively. The maximum intracellular PHB concentration obtained was 5.09 g/l, which was 20% (w/w) of the cell dry weight (CDW) after 72 h. Also, the synthesis of PHB was growth associated with the C:N ratio of 153.71. The maximum calculated Yp/s was 0.212 (gr/gr) and the specific...