GSC configuration management plan

The tools and methods used for the configuration management of the artifacts (including software and documentation) associated with the Guidance and Control Software (GCS) project are described. The GCS project is part of a software error studies research program. Three implementations of GCS are being produced in order to study the fundamental characteristics of the software failure process. The Code Management System (CMS) is used to track and retrieve versions of the documentation and software. Application of the CMS for this project is described and the numbering scheme is delineated for the versions of the project artifacts

Cupid\u27s Victimization of the Renaissance Male

Following the path of the use of the Petrarchan sonnet in Renaissance England, this article explores why this specific form was so prevalent from the court of Henry VIII to that of his daughter, Elizabeth I. The article pays specific attention to the works of Sir Philip Sidney, Shakespeare, Richard Barnfield, and Lady Mary Sidney Wroth, paying close attention to social, political, and gender issues of the period

Investigation of three classes of composite materials for space vehicle application

Three classes of composite materials for space vehicle applicatio

Spiked Saxifrage, Saxifraga spicata, Rediscovered in Canada After 110 Years

Saxifraga spicata (Micranthes spicata (D. Don) Small), a large perennial showy saxifrage endemic to the unglaciated regions of Alaska and Yukon, was rediscovered after not having been seen in Canada for 110 years

Internal stresses in steel plate generated by shape memory alloy inserts

Neutron strain scanning was employed to investigate the internal stress fields in steel plate coupons with embedded prestrained superelastic NiTi shape memory alloy inserts. Strain fields in steel were evaluated at T = 21 °C and 130 °C on virgin coupons as well as on mechanically and thermally fatigued coupons. Internal stress fields were evaluated by direct calculation of principal stress components from the experimentally measured lattice strains as well as by employing an inverse finite element modeling approach. It is shown that if the NiTi inserts are embedded into the elastic steel matrix following a carefully designed technological procedure, the internal stress fields vary with temperature in a reproducible and predictable way. It is estimated that this mechanism of internal stress generation can be safely applied in the temperature range from −20 °C to 150 °C and is relatively resistant to thermal and mechanical fatigue. The predictability and fatigue endurance of the mechanism are of essential importance for the development of future smart metal matrix composites or smart structures with embedded shape memory alloy components

Software requirements: Guidance and control software development specification

The software requirements for an implementation of Guidance and Control Software (GCS) are specified. The purpose of the GCS is to provide guidance and engine control to a planetary landing vehicle during its terminal descent onto a planetary surface and to communicate sensory information about that vehicle and its descent to some receiving device. The specification was developed using the structured analysis for real time system specification methodology by Hatley and Pirbhai and was based on a simulation program used to study the probability of success of the 1976 Viking Lander missions to Mars. Three versions of GCS are being generated for use in software error studies