Background: According to studies, despite the proven and effective role of mechanical ventilation on patients with respiratory failure, the positive effects of semi-upright position on oxygenation and ventilation of patients under mechanical ventilation and nurses’ training about them have been neglected. This study aimed to investigate the effect of outcome-based education of nurses on m...

this paper aims at investigating the effects of weld nugget size and expulsion on the mechanical properties of low carbon steel resistance spot welds using tensile-shear test. mechanical performance of spot welds are described in terms of failure mode, peak load and failure energy obtained from the tensile-shear test. the effects of voids and porosity as well as electrode indentation associated...

Durability is a long-standing challenge in designing liquid-repellent surfaces. A high-performance omniphobic surface must robustly repel liquids, while maintaining mechanical/chemical stability. However, liquid repellency and mechanical durability are generally mutually exclusive properties for many omniphobic surfaces-improving one performance inevitably results in decreased performance in an...

High autogenous shrinkage property is one of the disadvantages ultra-high-performance concrete (UHPC), which may induce early age cracking and threaten safety structure. In present study, different dosages calcium sulfoaluminate (CSA) cement were added in UHPC as an effective expansive binder. Hydration mechanism, property, compressive strength carried out to investigate effect CSA addition on ...

In the extended use of concrete in military applications, runway pavements and infrastructures, is subjected to heavy impact loads that vary both velocity intensity. The addition fibers high performance (HPC) can overcome its shortcomings such as brittleness, shrinkage less resistance also improve ductile behavior energy absorption capacity. this study, development on strengthening HPC using st...

The performance of asphalt binders at high and low temperatures has an important role on the rutting and crackingresistance of asphalt pavements. Crumb Rubber Modified (CRM) is one of the asphalt modifiers that improves asphaltphysical and mechanical properties and helps reducing environmental pollution. In this research, three unmodifiedand six CRM modified binders were teste...