Loop shape in fabric are analysed in this paper and the equation about law between remnant curvature and yarn linear density,yarn mechanical properties and knitting elements dimensions is set up.

A method of dispersion calculation was proposed for plastic deformation rate,thus getting the relationships between the plastic deformation rate,residual curvature and average residual stress for different combinations of reduction schedule under conditions of single-valued initial curvature.

In block A in Erlian oilfield the interpretation result indicates that some reservoirs with low porosity and low permeability have poor oil & gas reserve,but have high production capability after being fractured.

Considering the characteristics of low porosity and low permeability in the depression, effective evaluation methods for shale volume, porosity, medium diameter of particle, oil saturation and permeability are presented using Artificial Neural Network technique combined with con.

Based on coal seam gas industry that features low permeability in coal reserve bed in China,it is discussed the feasibility of an operational technology,well drilling,will be done by drilling holes parallel to the level of coal bed outside of the bed or projecting holes in multilayer for large slope pits with low polution for coal reserve bed.

Evolution law of mining coal permeability by real-time tracer monitoring system;

A new method for calculating sandstone permeability by using capillary pressure curves.;

Influence of permeability on single well controlling reserves in low permeability gas reservoirs;