Deformation modes in NbAl3

The DO₂₂ lattice of the NbAl₃ intermetallic compound shows very limited ductility at room temperature. In this study the slip and twinning systems that are active during the deformation process were investigated. Evaluation of the possible deformation modes was performed and contrast analysis in the transmission electron microscope revealed both expected and unexpected deformation modes. Two types of dislocations were found in the deformed structure, namely thea 〈110〉 superdislocation on the {112} plane and loops of unidentified dislocations on the {010} plane. No evidence of 〈201〉 superdislocations was found, probably due to the fact that this type of dislocation is expected to move in groups of four. Twins of the {112} type were found to play an important role in the deformation process since they supply a component of shear perpendicular to the (001) plane.     

New modes of mechanical ventilation

Many new approaches to mechanical ventilation have been developed. This article discusses these new strategies and modes. These include lung protection conventional ventilation strategies, long inspiratory time strategies, pressure-targeted breath enhancements, airway pressure-related release ventilation, and proportional-assist ventilation.     

Understanding modes of mechanical ventilation

Caring for patients receiving mechanical ventilation may be new to you, but it's almost certain that you'll be seeing them more often in the future. The modes of ventilation and assessment parameters discussed here will help you meet the special needs of these challenging patients.     

Resistance and modes of communication

The recognition that there are three modes of thinking and communicating--iconic, enactive, and symbolic--clarifies and simplifies many issues in psychoanalytic theory and technique. Although this concept is applicable to all communication, it is particularly important in understanding and interpreting various types of resistance. The author uses a number of vignettes to illustrate the forms and functions of various types of nonverbal communication within the psychoanalytic process.