Non-intrusive speed sensor

In Phase I of the Non-Intrusive Speed Sensor program, a computerized literature search was performed to identify candidate technologies for remote, non-intrusive speed sensing applications in Space Shuttle Main Engine (SSME) turbopumps. The three most promising technologies were subjected to experimental evaluation to quantify their performance characteristics under the harsh environmental requirements within the turbopumps. Although the infrared and microwave approaches demonstrated excellent cavitation immunity in laboratory tests, the variable-source magnetic speed sensor emerged as the most viable approach. Preliminary design of this speed sensor encountered no technical obstacles and resulted in viable and feasible speed nut, sensor housing, and sensor coil designs. Phase II of this program developed the variable-source magnetic speed sensor through the detailed design task and guided the design into breadboard fabrication. The speed sensor and its integral speed nut were evaluated at both unit and system level testing. The final room-temperature and cryogenic spin testing of the hardware demonstrated that the sensor was capable of generating sufficient output signal to enable remote speed sensing from 1500 to 40000 rpm over a speed nut/sensor separation of 3.5 inches

Non-intrusive speed sensor

A computerized literature search was performed to identify candidate technologies for remote, non-intrusive speed sensing applications in Space Shuttle Main Engine (SSME) turbopumps. The three most promising technologies were subjected to experimental evaluation to quantify their performance characteristics under the harsh environmental requirements within the turbopumps. Although the infrared and microwave approaches demonstrated excellent cavitation immunity in laboratory tests, the variable-source magnetic speed sensor emerged as the most viable approach. Preliminary design of this speed sensor encountered no technical obstacles and resulted in viable and feasible speed nut, sensor housing, and sensor coil designs

Nonintrusive shaft speed sensor

Reusable rocket engines such as the Space Shuttle Main Engines (SSME), the Orbital Transfer Vehicles (OTV), etc., have throttling capabilities that require real-time, closed-loop control systems of engine propellant flows, combustion temperatures and pressures, and turbopump rotary speeds. In the case of the SSME, there are four turbopumps that require real-time measurement and control of their rotary speeds. Variable-reluctance magnetic speed sensors were designed, fabricated, and tested for all four turbopumps, resulting in the successful implementation and operation of three of these speed sensors during each of the 12 Shuttle flights

Dust Devil Populations and Statistics

The highly-skewed diameter and pressure drop distributions of dust devils on Earth and Mars are noted, and challenges of presenting and comparing different types of observations are discussed. The widely- held view that Martian dust devils are larger than Earth\u27s is critically-assessed: the question is confounded somewhat by different observation techniques, but some indication of a ~3x larger population on Mars is determined. The largest and most intense (in a relative pressure sense) devils recorded are on Mars, although the largest reported number density is on Earth. The difficulties of concepts used in the literature of \u27average\u27 diameter, pressure cross section, and area fraction are noted in the context of estimating population-integral effects such as dust lifting

Quixotic Legacy: The Female Quixote and the Professional Woman Writer

This essay argues that Charlotte Lennox’s The Female Quixote or, The Adventures of Arabella (1752) served as a fulcrum in eighteenth-century literary history by providing a figuration of the female quixote for subsequent women novelists who were keen to court absorbed readers on the one hand while countering stereotypes about women's critical failings on the other. The figure of the female quixote proves to be a significant mark of literary professionalism by reifying the spectre of the professional writer’s need for absorbed readers and dramatizing the occasion by which the woman writer demonstrates her own authority, paradoxically allowing both woman novel reader and woman novel writer to lay claim to intellectual authority. Ultimately, the main character Arabella's fictional model potentially echoes more actual eighteenth-century women’s experiences than her adventures at first suggest: the female quixote emerges as less a social outcast or a freak than a figure for women’s commonality, especially their intellectual and ethical ambitions in a world inimical to their interests

Embodying Character, Adapting Communication; or, the Senses and Sensibilities of Epistolarity and New Media in the Classroom

This essay describes a classroom role-playing activity that incorporates both modern social media and the tools of eighteenth-century composition. Students communicate with each other as characters in the assigned novel, by either texting, tweeting, or writing longhand with quill pens. The exercise aims to help students grasp the sometimes-elusive historical contexts of eighteenth-century writing as well as the ways in which we interpret and adapt those contexts and their attendant modes of communication when we read for meaning in our own moment. My experiences suggest that the activity is particularly effective at helping students to reflect upon their own interpretive choices and to understand how medium affects content. Furthermore, it can illuminate the ways in which the medium influences not only the message, but also the messenger, thus revealing potentially surprising connections between material modes of communication, embodied behavior, and intellectual output

Peer mentoring for eating disorders:Evaluation of a pilot program

Background Eating disorders are serious psychiatric illnesses that are often associated with poor quality of life and low long-term recovery rates. Peer mentor programs have been found to improve psychiatric symptoms and quality of life in other mental illnesses, and a small number of studies have suggested that eating disorder patients may benefit from such programs. The aim of this study is to assess the efficacy of a peer mentor program for individuals with eating disorders in terms of improving symptomatology and quality of life. Methods Up to 30 individuals with a past history of an eating disorder will be recruited to mentor 30 individuals with a current eating disorder. Mentoring will involve 13 sessions (held approximately every 2 weeks), of up to 3 h each, over 6 months. Discussion This pilot proof-of-concept feasibility study will inform the efficacy of a peer mentoring program on improving eating disorder symptomatology and quality of life, and will inform future randomised controlled trials