Modified spiral wound retaining ring

A spiral wound retaining ring with angled ends is described. The ring is crimped at the same angle as the ring ends to maintain a constant thickness dimension. The angling of the ends of the ring and crimp allow the ends to be positioned closer together while maintaining enough clearance to enable insertion and removal of the ring. By reducing the separation distance between the ends a stronger ring results since the double layer area of the ring is maximized

Tarski monoids: Matui's spatial realization theorem

We introduce a class of inverse monoids, called Tarski monoids, that can be regarded as non-commutative generalizations of the unique countable, atomless Boolean algebra. These inverse monoids are related to a class of etale topological groupoids under a non-commutative generalization of classical Stone duality and, significantly, they arise naturally in the theory of dynamical systems as developed by Matui. We are thereby able to reinterpret a theorem of Matui on a class of \'etale groupoids as an equivalent theorem about a class of Tarski monoids: two simple Tarski monoids are isomorphic if and only if their groups of units are isomorphic. The inverse monoids in question may also be viewed as countably infinite generalizations of finite symmetric inverse monoids. Their groups of units therefore generalize the finite symmetric groups and include amongst their number the classical Thompson groups.Comment: arXiv admin note: text overlap with arXiv:1407.147

Shell tile thermal protection system

A reusable, externally applied thermal protection system for use on aerospace vehicles subject to high thermal and mechanical stresses utilizes a shell tile structure which effectively separates its primary functions as an insulator and load absorber. The tile consists of structurally strong upper and lower metallic shells manufactured from materials meeting the thermal and structural requirements incident to tile placement on the spacecraft. A lightweight, high temperature package of insulation is utilized in the upper shell while a lightweight, low temperature insulation is utilized in the lower shell. Assembly of the tile which is facilitated by a self-locking mechanism, may occur subsequent to installation of the lower shell on the spacecraft structural skin

Aircraft landing dynamics facility carriage weld test program

A welded tubular structure constructed of low alloy high strength quenched and tempered steel was tested. The consistency of the mechanical strengths and chemical composition and the degree of difficulty of obtaining full strength welds with these steels is characterized. The results of constructing and testing two typical connections which are used in the structure design are reported

Safety hazards associated with the charging of lithium/sulfur dioxide cells

A continuing research program to assess the responses of spirally wound, lithium/sulfur dioxide cells to charging as functions of charging current, temperature, and cell condition prior to charging is described. Partially discharged cells that are charged at currents greater than one ampere explode with the time to explosion inversely proportional to the charging current. Cells charged at currents of less than one ampere may fail in one of several modes. The data allows an empirical prediction of when certain cells will fail given a constant charging current

Preprofessional curriculum in preparation for doctor of pharmacy educational programs

The preprofessional pharmacy curriculum provides the foundation for the professional curriculum. Basic requirements are noted in the ACPE Standards and Guidelines, but there is considerable variation in the preprofessional curriculum requirements for entry into doctor of pharmacy programs in the United States. Changes in higher education, pharmacy practice, and health care continue to drive the need to evaluate the preprofessional curriculum. The objectives of this white paper were to create model preprofessional curricula that would enable students to be successful during and after entry into the professional curriculum. Using an evidence-based approach where possible, a number of factors were found to be associated with academic success during a pharmacy program and on licensing examinations. These data and other information were used to create 2 preprofessional curricular models that include the development of general and discipline-specific abilities. Challenges remain in accurately evaluating the abilities and attributes of applicants and the impact of those abilities and attributes on their success as a student and a practitioner. Colleges and schools of pharmacy should consider adopting a more consistent preprofessional curriculum on a national level. This preprofessional curriculum should be multi-dimensional, based on needs for future practice, and revised over time

A Quarter Century, Not a Raised Voice

This dedication was in recognition of Wilbert D. Ham’s retirement from the University of Kentucky College of Law faculty. Wilber D. Ham served on the faculty from 1949 until 1986