A new approach for vibration control in large space structures

An approach for augmenting vibration damping characteristics in space structures with large panels is presented. It is based on generation of bending moments rather than forces. The moments are generated using bimetallic strips, suitably mounted at selected stations on both sides of the large panels, under the influence of differential solar heating, giving rise to thermal gradients and stresses. The collocated angular velocity sensors are utilized in conjunction with mini-servos to regulate the control moments by flipping the bimetallic strips. A simple computation of the rate of dissipation of vibrational energy is undertaken to assess the effectiveness of the proposed approach

Distribution of the Water Scorpion \u3ci\u3eNepa Apiculata\u3c/i\u3e (Hemiptera: Nepidae) in Wisconsin

The water scorpion Nepa apiculata Uhler was considered rare in Wiscon- sin by Hilsenhoff (1984), who collected only 11 individuals during a 25-year period. All of his collections were from overwintering sites, especially debris in streams, during early spring or autumn (Hilsenhoff, pers. comm.). He concluded that the species was restricted to southern Wisconsin. Recent collections indicate that N. apiculata is more widely distributed. These records, summarized below, are documented with specimens in the University of Wisconsin-Madison insect collection

A Profile of Till Plain Archeology: A Survey of Hancock County Indiana

This document is publication associated with investigation number 71 in Ball State University's AAL (Applied Archaeological Laboratories) Report of Investigations series.This Historic Preservation Fund grant project investigated the archaeological resources of Hancock County. Nearly 800 acres of agricultural land were surveyed by pedestrian transects. The survey recorded 161 new archaeological sites, recovered 702 prehistoric artifacts and 950 historic artifacts from 14 locations across the county. The project also visited over 100 historically documented sites and recorded 13 new and two previously recorded sites German Settlement in Sugar Creek Township was investigated. Several local collections were reviewed and correlated to 17 archaeological sites. In total, 193 archaeological site inventory forms were completed. To assist in the management of archaeological data from Hancock County, a GIS database was also created. The information obtained from this project was then compared to regional information. While Hancock County archaeology is analogous to the till plain region, unique environmental characteristics distinguish the county. The abundance of poorly drained soils in the county amplifies the relationship of well drained soils and prehistoric settlement

Morality, Rationality and Academic Dishonesty: A Partial Test of Situational Action Theory

This study uses self-report survey data from a sample of college students to provide a partial test of WikstrÓ§m's situational action theory (2010a) by examining the extent, if any, to which the effects of perceptual deterrence on academic dishonesty are moderated by personal morality. The findings show that both personal morality and perceived certainty of formal sanctions are inversely associated with cheating; however, the deterrent effect of high perceived certainty of formal sanctions is not greater among those with weak moral prohibitions against cheating as predicted by WikstrÓ§m and observed by Svensson (2015) in an earlier test of WikstrÓ§m's situational action theory

Remediating Reading Skills - Utilizing Self-Awareness Through An Intensive Whole Language Approach

Reading remediation needs of second graders were addressed through an intensive whole language approach with particular emphasis on self-awareness. Teacher recommendations and basal scores were used to identify seven at-risk second grade students. Students attended a class for an hour daily during which main idea, cause and effect, and drawing conclusions were the skills targeted. Over the ten week implementation period, students focused on themselves, peer relationships and various aspects of the school. The students\u27 overall academic performances exceeded expectations. In the area of main idea, five of the seven students scored 80% and above. In cause and effect skills, all seven students scored above 75%. For drawing conclusions, seven out of seven students scored above 85% as reflected in the basal tests. Affective changes documented by the teacher included no discipline referrals for the students in this study after the second week of implementation. The results of this practicum provide significant information for adoption by individual classes and county level summer programs

Pointing and control system design study for the space infrared telescope facility (SIRTF)

The design and performance of pointing and control systems for two space infrared telescope facility vehicles were examined. The need for active compensation of image jitter using the secondary mirror or other optical elements was determined. In addition, a control system to allow the telescope to perform small angle slews, and to accomplish large angle slews at the rate of 15 deg per minute was designed. Both the 98 deg and the 28 deg inclination orbits were examined, and spacecraft designs were developed for each. The results indicate that active optical compensation of line-of-sight errors is not necessary if the system is allowed to settle for roughly ten seconds after a slew maneuver. The results are contingent on the assumption of rigid body dynamics, and a single structural mode between spacecraft and telescope. Helium slosh for a half full 4000 liter tank was analyzed, and did not represent a major control problem

Scheduling language and algorithm development study. Volume 2, phase 2: Introduction to plans programming

A user guide for the Programming Language for Allocation and Network Scheduling (PLANS) is presented. Information is included for the construction of PLANS programs. The basic philosophy of PLANS is discussed, and access and update reference techniques are described along with the use of tree structures