Porosity is one of the most important properties textile materials that ensures their comfort and usability. The internal pore structure cotton fiber assembly complex changeable, surface difficult to explain its structure. It intended develop a method predict morphology assembly. Pore image multi-layer collected by photography instrument, used Image Pro Plus 6.0 software analyze, obtained white...

To explore the acoustic characterization of composite solid propellant materials, wave equation viscoelastic body was derived based on linear constitutive model, and theoretical relationship between ultrasonic sound velocity attenuation coefficient, which are closely related to mechanical properties, such as elastic modulus, viscosity complex obtained. Ultrasonic air-coupled testing experiments...

The porosity of a zone can be estimated either from a single “porosity log” (sonic, density, neutron, or magnetic resonance log) or a combination of porosity logs, in order to correct for variable lithology effects in complex reservoirs. In the carbonates, mineral mixtures are primarily drawn from calcite, dolomite, and quartz (either as sand grains or as chert); anhydrite and gypsum may also o...

Nowadays, SiC is one of the refractory materials which is used widespread because of its unique properties like structural stability in high temperatures. SiC nano whiskers are important in reinforcement of different kinds of composites like ceramic base materials, thanks to their outstanding mechanical, thermal, and chemical properties like low expansion coefficient, high thermal resistant, hi...

In industry, the porosity of petrochemical reservoirs is measured frequently by coring and is an important property when trying to determine if a site is appropriate for drilling. Porosity can also be used in waste water treatment in order to determine if a material is ideal for water purification in industrial or residential applications. The purpose of this experiment was to simulate a oil re...

Anomalous velocity and porosity are often indicators of abnormal pore pressure. It is important, therefore, to be able to link velocity to porosity and rock texture in a rational, firstprinciple-based manner. The critical porosity concept allows for building such rock physics models. Critical porosity is the porosity above which the rock can exist only as a suspension. In sandstones the critica...

In this paper, we report an analysis of pressed paper in terms of porosity and permeability. Previously, we reported a pressed paper that exhibits decreased porosity and permeability. Additionally, its applications into programmed sample delivery as well as flow rate control were reported. However, there is a need for a theoretical analysis of pressed paper in terms of porosity and permeability...

Abstract This paper describes a new formulation for estimating the permeability of drainages composed natural sands with no clay content, starting from parameters obtained grain size distribution. The conventional relationships are functions granulometric factors and porosity. However, media typically used as drainage, grading is determinant factor, so porosity dependence can be replaced by fun...

Predicting transient behavior of lead–acid batteries during charge and discharge process is a very important factor in many applications including Hybrid Electric Vehicles (HEV). In this paper, an engineering model based on fundamental chemical and electrochemical relations of lead– acid batteries is introduced. This model is capable to predict transient behavior of lead–acid batteries includin...