Poromechanical Modeling and Numerical Simulation of Hydraulic Fracture Propagation.

Hydraulic fracturing (HF) is an important technique for enhancing the permeability of petroleum and gas reservoirs. To understand the coupling response mechanism of fluid pressure and in situ stress during the expansion of hydraulic fractures-based on the theory of the fluid flow of seepage porous media and damage mechanics-a poromechanical model of hydraulic fracture propagation is proposed and the finite element method (FEM) numerical weak coupling calculation method of hydraulic fracturing is realized. First, the effect of the coupling stress field is described by introducing the β value of the amount of pore volume that varies, resulting from internal pressure per unit of fluid internal, and the coupling calculation method of the pore pressure-effective stress-element damage-pore pressure expansion coefficient is formulated.

The enhanced ability of peripheral mononuclear cells differentiating into neural cells in term infants with good improvement suffering from severe hypoxic ischemic encephalopathy.

Objective: It has been found that asphyxia influences proliferation and differentiation of brain neural stem cells in newborn animal models, and that peripheral blood stem cells play an important role in repairing brain damage. But it has not been reported yet whether asphyxia influences peripheral blood stem cells differentiating into neural cells, and whether with the progress of the disease there is a change of peripheral blood stem cells differentiating into neural cells in newborns with hypoxic ischemic encephalopathy (HIE).

Methods: Fifty term HIE infants were enrolled in research from March, 2007 to March, 2010.

Complete mitochondrial genome of a parthenogenetic subterranean termite, Reticulitermes aculabialis Tsai et Hwang (Isoptera: Rhinotermitidae).

The complete mitochondrial genome of a parthenogenetic termite Reticulitermes aculabialis was assembled and analyzed. The mitogenome is 16,475 bp long and contains the same gene repertoire and gene order as other Reticulitermes species (13 protein-coding genes, 22 tRNA genes, 2 rRNA genes and control region). Coding genes (PCGs, tRNAs and rRNAs) are 14,688 bp in length, occupying 89.