Large-diameter astromast development

The 15-m-long by 0.75-diameter deployable supermast was delivered. The performance characteristics, design parameters, and developmental work associated with this mast are described. The main differences, besides the length of these two mast sections, are a change in the longeron material (the principal structural member) to a circular cross section and the incorporation of a lanyard-bridle system which makes unaided deployment and retraction possible in zero gravity

The geometry of the 37-tile microwave antenna support structure

The geometry of the support structure for a proposed parabolic shaped microwave antenna is examined. The surface of the antenna is comprised of 37 hexagonal shaped tiles, each connected to a truss module. The units are joined together to form a rigidized, faceted, concave parabolic surface. The geometry specifications are described through an explanation of the structural components which make up the antenna, a description of the coordinate system devised to identify the structure, and a presentation of the nondimensional results

yaImpute: An R Package for kNN Imputation

This article introduces yaImpute, an R package for nearest neighbor search and imputation. Although nearest neighbor imputation is used in a host of disciplines, the methods implemented in the yaImpute package are tailored to imputation-based forest attribute estimation and mapping. The impetus to writing the yaImpute is a growing interest in nearest neighbor imputation methods for spatially explicit forest inventory, and a need within this research community for software that facilitates comparison among different nearest neighbor search algorithms and subsequent imputation techniques. yaImpute provides directives for defining the search space, subsequent distance calculation, and imputation rules for a given number of nearest neighbors. Further, the package offers a suite of diagnostics for comparison among results generated from different imputation analyses and a set of functions for mapping imputation results.

Dunks and Drunks: Depictions of Drug and Alcohol Use Among High School Athletes in Film

Mediated portrayals of student-athletes can provide strong role models for realworld student-athletes. This research explored the images of student-athletes in sportrelated films regarding depictions of drug and alcohol use. A content analysis of six sport-related films released between 1994 and 2000 was conducted 1) to address whether such films accurately depicted drug and alcohol use among student-athletes and 2) to consider how these presentations might impact viewers who are, themselves, high school student-athletes. Results suggested that the films reinforced the notion that student-athletes are supposed to experiment with drugs and alcohol as a part of the social role relative to sport participation. Further, films suggested experimentation could take place with little or no consequence. Thus, sport films likely counteract progress made through educational initiatives aimed at curbing drug and alcohol use among student-athletes

Dunks and Drunks: Depictions of Drug and Alcohol Use Among High School Athletes in Film

Mediated portrayals of student-athletes can provide strong role models for realworld student-athletes. This research explored the images of student-athletes in sportrelated films regarding depictions of drug and alcohol use. A content analysis of six sport-related films released between 1994 and 2000 was conducted 1) to address whether such films accurately depicted drug and alcohol use among student-athletes and 2) to consider how these presentations might impact viewers who are, themselves, high school student-athletes. Results suggested that the films reinforced the notion that student-athletes are supposed to experiment with drugs and alcohol as a part of the social role relative to sport participation. Further, films suggested experimentation could take place with little or no consequence. Thus, sport films likely counteract progress made through educational initiatives aimed at curbing drug and alcohol use among student-athletes

The Re- in Reprocessing

Who knew a simple prefix could make such a difference? When I initially accepted a position at Clemson University to reprocess the James F. Byrnes papers, I thought, process ... reprocess ... what\u27s the difference, really? The collection consists of about a hundred and thirty cubic feet of manuscript material, and I thought I would be doing the same old arranging I had been trained to do, just on a much larger scale. However, after a closer examination of the collection, apprehension and even dread slowly began to set in. This was much more than just a simple arrangement project

Militarism Goes to School

While there are many influences that shape how schools are structured one that has been largely ignored is the influence of militarism. Militarism refers to a set of values or ideologies that include hierarchical relationships and domination. This piece discusses the ways that schools are militaristic, including their authority, physical, academic, and athletic structures, the processes used by administrators and in classrooms, and the curriculums taught

To Temp or Not to Temp: An Informal Opinion on Temporary Jobs

Temporary or grant-funded positions are becoming an increasingly common and effective means of obtaining practical work experience for beginning archivists and librarians. For those new professionals considering limited-term jobs, there are several issues to explore before accepting such a position. Interestingly enough, most of the issues addressed below can be viewed as advantages or disadvantages, depending on perspective and approach. The thoughts and opinions expressed in this informal case study are based on my experiences in a temporary position and are intended solely as such

Large diameter astromast development, phase 1

Coilable-longeron lattice columns called Astromasts (trademark) were manufactured for a variety of spacecraft missions. These flight structures varied in diameter from 0.2 to 0.5 meter (9 to 19 in.), and the longest Astromast of this type deploys to a length of 30 meters (100 feet). A double-laced diagonal Astromast design referred to as the Supermast (trademark) which, because it has shorter baylengths than an Astromast, is approximately four times as strong. The longeron cross section and composite material selection for these structures are limited by the maximum strain associated with stowage and deployment. As a result, future requirements for deployable columns with high stiffness and strength require the development of both structures in larger diameters. The design, development, and manufacture of a 6.1-m-long (20-ft), 0.75-m-diameter (30-in.), double-laced diagonal version of the Astromast is described