Some Unusual Emergencies

Some physiological aspects of respiratory emergencies.

THE term 'respiratory emergency denotes a state of interference with respiratory exchange to such an extent that life is endangered. While the term is commonly limited to acute disturbances of ventilation in dramatic circumstances (drowning, electrocution, poliomyelitis), in fact a much wider range of conditions can properly be regarded as respiratory emergencies and should be treated as such. ...

Some Unusual Joint Lesions

a matter of considerable difficulty and treatment protracted and laborious. The disability and impairment of .function may be out of all proportion to the pathological lesion. Moreover, it is often necessary to supplement any operative procedure by a prolonged course of graduated remedial exercises or of physio-therapy. The management of such cases, therefore, requires considerable experience a...

Some Unusual Open Learner Models

Open learner models to facilitate reflection are becoming more common in adaptive learning environments. There are a variety of approaches to presenting the learner model to the student, and for the student to interact with their open learner model, as the requirements for an open learner model will vary depending on the aims of the system. In this paper we extend existing approaches yet furthe...

Some Unusual Matrix Eigenvalue Problems

We survey some unusual eigenvalue problems arising in different applications. We show that all these problems can be cast as problems of estimating quadratic forms. Numerical algorithms based on the well-known Gauss-type quadrature rules and Lanczos process are reviewed for computing these quadratic forms. These algorithms reference the matrix in question only through a matrix-vector product op...

Some Unusual Acute Abdominal Conditions