Analysis and test for space shuttle propellant dynamics

This report presents the results of a study to develop an analytical model capable of predicting the dynamic interaction forces on the Shuttle External Tank, due to large amplitude propellant slosh during RTLS separation. The report details low-g drop tower and KC-135 test programs that were conducted to investigate propellant reorientation during RTLS. In addition, the development of a nonlinear finite element slosh model (LAMPS2, two dimensional, and one LAMPS3, three dimensional) is presented. Correlation between the model and test data is presented as a verification of the modeling approach

Analysis and test for space shuttle propellant dynamics (1/10th scale model test results). Volume 1: Technical discussion

Space shuttle propellant dynamics during ET/Orbiter separation in the RTLS (return to launch site) mission abort sequence were investigated in a test program conducted in the NASA KC-135 "Zero G" aircraft using a 1/10th-scale model of the ET LOX Tank. Low-g parabolas were flown from which thirty tests were selected for evaluation. Data on the nature of low-g propellant reorientation in the ET LOX tank, and measurements of the forces exerted on the tank by the moving propellent will provide a basis for correlation with an analytical model of the slosh phenomenon

Privacy in crowdsourcing:a systematic review

The advent of crowdsourcing has brought with it multiple privacy challenges. For example, essential monitoring activities, while necessary and unavoidable, also potentially compromise contributor privacy. We conducted an extensive literature review of the research related to the privacy aspects of crowdsourcing. Our investigation revealed interesting gender differences and also differences in terms of individual perceptions. We conclude by suggesting a number of future research directions.</p

Ten Years In: Implementing Strategic Approaches to Cyberspace

This book represents a look beyond theories and analogies to examine the challenges of strategy implementation. In the essays that follow, practitioners who are building cyberspace forces at-scale join scholars who study power and force in this new domain to collectively offer a unique perspective on the evolution and future of cyber strategy and operations.https://digital-commons.usnwc.edu/usnwc-newport-papers/1044/thumbnail.jp

The Technological culture of war

The article proceeds from the argument that war is a social institution and not a historical inevitability of human interaction, that is, war can be “unlearned.” This process involves deconstructing/dismantling war as an institution in society. An important step in this process is to understand the philosophical and cultural bases on which technology is employed as “tools” of war. The article focuses on such questions as, Is technology just viewed as instruments in the hand of its human masters in war? Does technology take on an autonomous role in war? How should we assess the impact of context (political, economic, and cultural) of technology when employed in war? By exploring these points, the article hopes to provide input into the discussion on the control of war technologies and ultimately the dismantling of war as an institution in society

Team Collaboration: The Use of Behavior Principles for Serving Students With ASD

PurposeSpeech-language pathologists (SLPs) and behavior analysts are key members of school-based teams that serve children with autism spectrum disorders (ASD). Behavior analysts approach assessment and intervention through the lens of applied behavior analysis (ABA). ABA-based interventions have been found effective for targeting skills across multiple domains for children with ASD. However, some SLPs may be unfamiliar with the breadth of ABA-based interventions. The intent of this tutorial is to briefly introduce key ABA principles, provide examples of ABA-based interventions used within schools, and identify strategies for successful collaboration between behavior analysts and SLPs.MethodThis tutorial draws from empirical studies of ABA-based interventions for children with ASD within school settings, as well as discussions in the extant literature about the use of behavior principles by SLPs and strategies for interdisciplinary collaboration.ConclusionGiven the prevalence of ASD at 1 in 68 children (Centers for Disease Control and Prevention, 2014) and the high cost of serving these children within schools (an average cost of 286% over regular education; Chambers, Shkolnik, &amp; Perez, 2003), the need for effective, comprehensive service provision and efficiency within interdisciplinary teams is paramount. Communication, mutual understanding, and recognition of common ground between SLPs and behavior analysts can lead to successful collaboration