A new β-metastable Ti-alloy is designed with the aim to obtain a TWIP alloy but positioned at limit between TRIP/TWIP and dominated regime. The exhibits large ductility combined an elevated stable work-hardening rate. Deformation occurring by formation multiplication of {332}<113> twins evidenced followed in-situ electron microscopy, no primary stress induced martensite observed. Since microstr...

This paper presents a set of rules of operation which guarantee that a computer system can remain secure while exhibiting certain desired external characteristics. The rules are easily transformable into algorithms suitable for implementation on a digital computer. iii PREFACE In our introductory paper on secure computer systems (MTR-2547, Vol. I) we introduced a framework for mathematical mode...

Reconfigurable devices, whose shape can be drastically altered, are central to expandable shelters, deployable space structures, reversible encapsulation systems and medical tools and robots. All these applications require structures whose shape can be actively controlled, both for deployment and to conform to the surrounding environment. While most current reconfigurable designs are applicatio...

Pakula, Roman (University of Toronto, Toronto, Ontario, Canada). Factors regulating competence in transformation of streptococci. J. Bacteriol. 90:1320-1324. 1965.-The highly transformable group H Streptococcus strain Challis produced an exocellular competence-provoking enzyme capable of converting to the state of competency incompetent cells of the homologous strain, and of the very poorly tra...