Scalar field power-law cosmology with spatial curvature and dark energy-dark matter interaction     

Burin Gumjudpai  Kiattisak Thepsuriya 《Astrophysics and Space Science》2012,342(2):537-547

We consider a late closed universe of which scale factor is a power function of time using observational data from combined WMAP5+BAO+SN Ia dataset and WMAP5 dataset. The WMAP5 data give power-law exponent, α=1.01 agreeing with the previous study of H(z) data while combined data gives α=0.985. Considering a scalar field dark energy and dust fluid evolving in the power-law universe, we find field potential, field solution and equation of state parameters. Decaying from dark matter into dark energy is allowed in addition to the non-interaction case. Time scale characterizing domination of the kinematic expansion terms over the dust and curvature terms in the scalar field potential are found to be approximately 5.3 to 5.5 Gyr. The interaction affects in slightly lowering the height of scalar potential and slightly shifting potential curves rightwards to later time. Mass potential function of the interacting Lagrangian term is found to be exponentially decay function.  相似文献   

Crushed Salt Consolidation for Borehole Sealing in Potash Mines     

Supattra Khamrat  Prachya Tepnarong  Kiattisak Artkhonghan  Kittitep Fuenkajorn 《Geotechnical and Geological Engineering》2018,36(1):49-62

Consolidation tests have been performed to determine the mechanical properties of crushed salt as affected by applied stresses and consolidation period. The crushed salt with particle sizes ranging from 0.075 to 4.76 mm mixed with 5% saturated brine are consolidated under axial stresses ranging from 2.5 to 10 MPa. The consolidation curves show instantaneous and transient strains. The densities, uniaxial compressive strengths and elastic moduli measured after consolidation for 3–180 days increase with applied stresses and time. The crushed salt properties are determined as a function of mean strain energy required during consolidation. The relations are used to predict the crushed salt properties installed in exploratory boreholes under various external pressures. Two main mechanisms strengthen and stiffen the crushed salt mass: (1) consolidation by volumetric change due to particle rearrangement and cracking, and (2) recrystallization and healing processes. The borehole depth and installation time are significant factors controlling the long-term density, strength and stiffness of the crushed salt seal.  相似文献