From fairy circles to patterned ground and columnar joints, natural patterns spontaneously appear in many complex geophysical settings. Here, we investigate the origins of polygonally crusts salt playa pans. These beautifully regular features, approximately a meter diameter, are found worldwide fundamentally important transport dust arid regions. We show that they consistent with surface expres...

An ER430LNb ferritic stainless steel wire was used for a gas metal arc welding (GMAW) test. The characteristics of droplet transfer and its corresponding voltage current waveforms were investigated using high-speed camera synchronous acquisition electrical signals. weld formation, patterns microstructures under different parameters observed, the effect level on frequency discussed. As results s...

Abstract We studied the non-linear mechanical response and failure mechanism of columnar jointed basalts (CJBs) with transverse joints by modeling meso-mechanics, statistical damage theory continuum mechanics. The anisotropy shape effect CJBs were captured under different lateral pressures. digital images transformed into heterogeneous element meshes, gradual fracturing process various modes re...

Abstract The spray formed 7055 aluminum alloy with 4.2mm thickness was welded by laser-arc hybrid heat source. microstructures and properties of the joints are studied. results show that weld appearance is very full zone primary composed equiaxed crystals. Those crystals morphology in different positions also different, only a small amount columnar locally fusion zone. average microhardness val...

The liquid film re-growth behaviour resulting from pulsed laser surface melting (LSM) has been investigated for typical 2xxx, and 7xxx aerospace alloys, both on parent plate and friction stir welded (FSW) joints. In Zr free alloys, as a result of the high growth rate and steep thermal gradient, the melted layer re-grew with a stable front, epitaxially, from the parent subsurface grains. This ca...

conclusions bilateral anterior shoulder dislocation is rare. it could be undiagnosed, especially when there is no clear history of major trauma. by awareness of such unusual possibility, early diagnosis, treatment, and reduction can provide desirable outcome. introduction shoulder dislocation is the most common presentation of joint dislocation in emergency department (ed). bilateral shoulder d...

There is no satisfactory biomarker yet available for predicting the likelihood of premalignant changes or carcinoma developing in Barrett's or columnar lined oesophagus. In this study we have evaluated the proliferation of squamous epithelium, columnar epithelium from columnar lined oesophagus and gastric columnar epithelium from 23 Barrett's patients using positive immunoreactivity with the mo...

There is no satisfactory biomarker yet available for predicting the likelihood of premalignant changes or carcinoma developing in Barrett's or columnar lined oesophagus. In this study we have evaluated the proliferation of squamous epithelium, columnar epithelium from columnar lined oesophagus and gastric columnar epithelium from 23 Barrett's patients using positive immunoreactivity with the mo...