In an experiment aboard the Hughes Corporation Leasat vehicle at geosynchronous orbit, single event upsets (SEU) have been continuously monitored in a memory consisting of 93L422 RAMs. Using simultaneous measurements of the high energy galactic cosmic ray and solar flare particle environment from The University of Chicago experiment aboard the IMP-8 satellite, together with a Leasat mass distribution model and ground test measurements of the SEU susceptibility for the 93L422, accurate estimates of the SEU rate are calculated based on several improvements to the standard methods.These results are discussed and compared to the Leasat flight observations.

No abstract

Statistical characteristics obtained from measurements of out-of-plumb columns and walls in three core-braced buildings and one large industrial building under construction are presented. The new data are presented together with a summary of results of measurements previously available in the published literature. Special techniques are introduced for measuring out-of-plumbs and for reducing the data for use in design.

No abstract

The effects of gravity loads acting on column and wall deviations from plumb in core-braced buildings have been investigated and expressions for the forces involved have been published in previous papers. The predictions obtained from the design expressions, as applied to two typical core-braced buildings, are compared in this article with corresponding actions resulting from wind and earthquake loads.This investigation aims at separating the effects that are significant in design from those that are small enough to be neglected. A set of simple rules to account for the out-of-plumb effects in buildings is presented as a possible complement to the existing recommendations on stability in the Canadian standard for steel construction CAN3-S16.1-M78.