Solder joints formed in microgravity are inferior to Earth gravity. They mechanically weaker and less electrically conductive due voids forming the when soldering microgravity. Surface tension lack of gravitational buoyancy combine prevent flux water vapors from escaping molten solder absence gravity, resulting more porous joints. Additionally, corrosive vapor products remain trapped causing fu...

Detecting stratigraphic discontinuities using well log data is a fundamental task in petroleum geosciences projects. Wavelet transforms (WT) and S-transform (ST) of well log data can provide objective identification of lithological interfaces to aid in this effort. The continuous wavelet transform (CWT) of a time series gives the wavelet correlation coefficients (i.e. similarity) between the gi...

The effects of a porous fence with a nonuniform porosity on flow fields are investigated numerically. First, an experiment with a non-uniform porous fence located in a wind tunnel is performed to obtain a reference data set. Then, a numerical model that utilizes the finite volume schemewith a weakly compressible-flowmethod to solve the continuity and momentum equations is developed. The numeric...

this study aims to identify favorable oil–gas reservoir facies in the chishan group of the wubao fault zone (gaoyou sag, subei basin, china) using the methods of outcrops and cores observation, granularity analysis, scanning electron microscope, log data, etc. the results suggest that the chishan group in the studied area mainly develops desert sedimentary system, and contains five kinds of fac...

To unravel how the microstructure affects the fracture surface roughness in heterogeneous brittle solids like rocks or ceramics, we characterized the roughness statistics of postmortem fracture surfaces in homemade materials of adjustable microstructure length scale and porosity, obtained by sintering monodisperse polystyrene beads. Beyond the characteristic size of disorder, the roughness prof...

Heavy oil is an important unconventional resource with huge availability worldwide, which also forms the primary source in Fengcheng oilfield, XinJiang, China. The elastic properties and consolidation status of heavy sands are significant values as they can provide guidance for reservoir exploration production. However, due to lack detailed rock physics investigation knowledge about their micro...

HOUSTON–The fundamental properties of gas shales make them virtually impossible to analyze with conventional core analysis methods or petrophysical models based on log data. This includes permeabilities in the tens to hundreds of nanoDarcies, low effective porosities (typically less than 10 percent), and high kerogen and clay contents. The tightness of the rock and the abundance of clay mineral...

Monolithic aerogels of high molecular weight polyethylene (Mw= 3x106- 6x106 g/mol) have been prepared by solvent extraction with supercritical carbon dioxide from thermoreversible gels prepared in decalin. These low density and highly porous aerogels present an apparent porosity up to 90%. The aerogel morphology observed by scanning electron microscopy (SEM) is characterized by spherulitic stru...

monolithic aerogels of high molecular weight polyethylene (mw= 3x106- 6x106 g/mol) have been prepared by solvent extraction with supercritical carbon dioxide from thermoreversible gels prepared in decalin. these low density and highly porous aerogels present an apparent porosity up to 90%. the aerogel morphology observed by scanning electron microscopy (sem) is characterized by spherulitic stru...