We interpret experimentally known B-Mg-Ru crystals as quasicrystal approximants whose deterministic decoration of tiles by atoms can be extended quasiperiodically. Experimentally observed disorder corresponds to phason fluctuations. First-principles total energy calculations find many distinct tilings close to stability and suggest a phase transition from a crystalline state at low temperatures...

Structure fluctuations in proteins affect a broad range of cell phenomena, including stability of proteins and their fragments, allosteric transitions, and energy transfer. This study presents a statistical-thermodynamic analysis of relationship between the sequence composition and the distribution of residue fluctuations in protein-protein complexes. A one-node-per-residue elastic network mode...

rangeland ploughing and cultivation using dry land farming crops may be amajor reason for the destruction of natural resources in the semiarid and sub-humid regionswhich may significantly change the composition and reduce the stability of the affectedcommunities. in present research, an abandoned ploughed site was compared with a nearbyreference site in the semiarid rangelands of baharkish, quc...

Background: Value added tax as an indirect tax is one of the effective sources of government tax revenue and the study of its economic effects is the focus of many economic studies. Therefore, the purpose of this article is to investigate the effect of VAT on the stability of the public sector economy in Iran with the approach of promoting tax ethics and culture. Method: The present study was ...

Background: Software product line (SPL) scoping is an important phase when planning for product line adoption. A SPL scope specifies: (1) the extend of domain supported by the product line, (2) portfolio of products in the product line and (3) list of assets to be developed for reuse across the family of products. Issue: SPL scope planning is usually based on estimates about the state of the ma...

Thermodynamic stability of statistical systems requires that susceptibilities be semipositive and finite. Susceptibilities are known to be related to the fluctuations of extensive observable quantities. This relation becomes nontrivial, when the operator of an observable quantity is represented as a sum of operators corresponding to the extensive system parts. The association of the dispersions...