481 research outputs found
Voyage of the Northern Light : newspaper reports and articles.
No full textCover title.; For private circulation only.; Contains typescript copy of a letter from the author to the Daily telegraph.; Library's N copy is inscribed "To the Editor Bulletin, Joshua Slocum ... Strictly private". ANL; Electronic reproduction. Canberra, A.C.T. : National Library of Australia, 2009
Platform for in-situ manufacturing of underground cable
No full textThesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018Supervised by Alexander H. Slocum. Cataloged from PDF of thesis. Vitae.Includes bibliographical references (pages 83-86).As the demand for and viability of renewable energies has increased, connecting remote power generation stations to demand centers has become more important. High Voltage Direct Current (HVDC) transmission systems offer efficiency and cost effectiveness over long distances, allow for the linkage of incompatible AC grids, and can be immune to telluric currents and aggressive EMP attacks, which all make these systems particularly applicable to connecting to remote renewables. With the current state-of-the-art in HVDC, overhead lines (OHL) are several times cheaper than underground cables (UGC). However, OHLs have security risks and create substantial visual pollution, which has resulted in significant public opposition and lengthy delays in project permitting. Project developers have reluctantly agreed to replace portions of overhead line with underground cable as a concession to these stakeholders. One way to make UGCs more attractive to developers is to reduce cost by locating UGC systems along railroad right of ways. The increased mobility of heavy machines and materials on railroads and the state-of-the-art in railroad construction machinery provide both precedent and process advantages, which make the concept of augmenting railroads with underground cable systems an attractive one. The practice of installing and maintaining such systems could be less complex than traditional methods required by independent transmission corridors. The use of private railways may avoid conflicts with external stakeholders and eliminate the regulatory delays that have plagued many renewable energy transmission projects. Additionally, taking advantage of the increased accessibility of railroads by in-situ manufacturing high voltage, extruded cable in lengths far greater than what is currently able to be transported by road haulage, may reduce overall project costs by eliminating expensive and vulnerable cable splices. To accomplish this, here we present a method for continuously manufacturing and installing high voltage undergourd cable from a moving "Cable Train" using public-private railway systems. There are three primary challenges associated with such a mobile platform -- extrusion, curing, and degassing. Several promising countermeasures have been presented, which require varying levels of further development continuous extrusion, horizontal curing, and inline degassing. Herein, further discussions on standards, system topology, earthworks, practical limitations to cable production length, and cost estimation, can also be found. The technology and methods to accomplish this vision can be achieved by a pre-competitive technology consortium with member companies capable of completing and fully realizing the proof-of-concept designs proposed.by Luke A. Gray, Alexander H. Slocum and Qi Du.S.B.S.B. Massachusetts Institute of Technology, Department of Mechanical Engineerin
Sensor and behavior frameworks for implementing backseat driver on a slocum glider
No full textThe Slocum glider’s long-duration and cost-effective oceanographic data collection capability, coupled with remote operation from shore, makes them ideal platforms for oceanographic research. However, once submerged in standard operation, instrument control, waypoints, behaviors, and more are set until the vehicle resurfaces. This lack of underwater adaptive control can lead to limitations in scientific sampling, limiting the glider’s ability to meet the mission’s scientific goals. Such goals could be oil spill detection or processing large data files from onboard sensors. Both require either optimizing the autonomous underwater vehicle’s (AUVs) flight path intelligently and adaptively, which allows more data collection in scientifically rich areas, or an increase in onboard computing power for an increase in data processing capability. Due to the need for enhanced control capability while underwater, the Slocum glider Backseat Driver (BSD) architecture has been in development for over ten years, but its utilization has been limited by the availability of resources and expertise on the subject, resulting in limited end-user implementation.
In this work, I present a manual for using the Slocum BSD architecture on a G3S Slocum glider. It contains examples for setting up an external controller (a Raspberry Pi 4), managing file transfers, incorporating real-time sensor data for decision-making, and advancing the ocean simulation capability of a glider simulator using a Slocum Fleet Mission Control (SFMC) script. I also demonstrate two Slocum BSD architecture test cases to autonomously navigate with a ninety-degree offset from the depth-averaged current (DAC), then on a heading calculated to minimize deflection distance while crossing a large-scale current.
Four simulations were run, two with the standard industry practice of using a distant waypoint to control the heading when crossing large-scale fast-moving currents, and two with the Slocum BSD architecture use-case examples. The missions utilizing the BSD architecture updated the heading less frequently and did so with a more optimal average heading. All examples listed previously, and more, are explained in far greater depth in the accompanying manual titled: Implementing the Backseat Driver Architecture on a G3S Slocum Glider: A Manual for Operators.
Through using the Slocum BSD architecture, we can fully realize the glider’s true capability for long-duration and cost-effective persistent oceanographic sampling presence in challenging regions throughout the globe. This research and accompanying manual provide a starting point for glider pilots, technicians, scientists, and others when working through how to use the Slocum glider’s BSD architecture. The ability to use this incredibly powerful way to enhance the Slocum glider’s capability and data collection is only limited by our imagination and ingenuity.M.S.Includes bibliographical reference
Settler histories of place: Frances Slocum and Miami dispossession
No full textFrances Slocum has become the most famous Miami Indian woman in history, which is surprising because she was born to a white Quaker family. This project traces the formation of her captivity narrative as she is transformed into a figure of local history in two distinct places: Wilkes-Barre, Pennsylvania where she was captured and Peru, Indiana where she lived and was buried. Settler Histories of Place examines the periods in which her narrative gains popularity and finds that her story circulates most widely at moments when there are broader movements to take control of Miami Indian lands in Indiana. How storytellers describe her racial identity shapes how she is imagined as a historical figure of settler and native history. What details are included or omitted shapes how the violence of settling the United States is imagined. Narratives about Frances Slocum are used in two particular regions as key historical stories of place. These stories use racial descriptions to naturalize a settler sense of belonging, normalizing settler claims to land inhabited by the Miami. Accounting for Miami perspectives of Frances Slocum disrupts settler narratives of Miami absence and reveals the cultural logics of public history in a settler-context.Ph.D.Includes bibliographical referencesby Ashley Falzett
An authentic narrative of the life of Joshua Slocum : containing a succinct account of his revolutionary services, together with other interesting reminisences [!] and thrilling incidents in his eventful life / carefully compiled by his eldest son, John Slocum.
No full textviii, [9]-105 p.
Thermal lag correction on Slocum CTD glider data
No full textAuthor Posting. © American Meteorological Society, 2011. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Atmospheric and Oceanic Technology 28 (2011): 1065–1071, doi:10.1175/JTECH-D-10-05030.1.In this work a new methodology is proposed to correct the thermal lag error in data from unpumped CTD sensors installed on Slocum gliders. The advantage of the new approach is twofold: first, it takes into account the variable speed of the glider; and second, it can be applied to CTD profiles from an autonomous platform either with or without a reference cast. The proposed methodology finds values for four correction parameters that minimize the area between two temperature–salinity curves given by two CTD profiles. A field experiment with a Slocum glider and a standard CTD was conducted to test the method. Thermal lag–induced salinity error of about 0.3 psu was found and successfully corrected.This work is part of the SINOCOP
and GliderBal projects funded by CSIC and Govern
Balear, respectively
Aerial photography flown for the Australian Antarctic Division from CASA 212-400 aircraft, 2010-11
No full textProgress Code: completedStatement: The accuracy of the positions in the EXIF information of the images is limited by the one second update interval of the GPS and the distance the aircraft would travel in one second.Digital aerial photography was flown by a contractor for the Australian Antarctic Division (AAD) from CASA 212-400 aircraft during the 2010-11 season. <br/><br/>Photographs were taken for various projects or needs:<br/>Whales project requested by Natalie Kelly (Science Branch AAD and CSIRO); Cronk Islands, Knox Coast, Wilkes Coast - requested by Colin Southwell (Science Branch AAD, AAS project 2722) - the coverage also includes Bailey Peninsula and part of Clark Peninsula; Frazier Islands - requested by Ian Hay (Strategies Branch AAD, AAS project 3154); Aurora Basin - taken on the return flight from Dome C to Casey of Aurora Basin GC41 position 71 degrees 36'10''S, 111 degrees 15'46''E; Wilkins Aerodrome - to photograph runway and melt; Casey, Wilkes - requested by Gill Slocum (Strategies Branch AAD). <br/><br/>The photographs were taken between 2 January 2011 and 6 February 2011. In most cases the images were georeferenced in the camera using the aircraft GPS.<br/><br/>Vertical photographs were taken with an in floor camera system using a Nikon D200 digital camera and oblique photographs were taken using a handheld Nikon D700 digital camera in the cockpit.<br/><br/>The set of images is too big for download but the images are available upon request from the Australian Antarctic Data Centre.<br/><br/>Data extracted from the exif information of the images are available for download as csv files and, in some cases, shapefiles. These data include file name, date, camera, focal length, latitude, longitude and altitude.<br/><br/>The images of the Cronk Islands and the Frazier Islands can be viewed in the Australian Antarctic Data Centre's Aerial Photograph Catalogue - see a Related URL below. The Film/Digital Series are ANTD1260 (Cronk Islands and Frazier Islands 2 January 2011) and ANTD1261 (Frazier Islands 23 January 2011)
Design and evaluation of an abrasive saw kickback machine
No full textThesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2020Supervised by Alexander H. Slocum. Cataloged from the PDF version of thesis.Includes bibliographical references (page 65).Injuries from power saw kickback are often fatal. However, only woodcutting saws have regulations and assessment methodologies for kickback. These regulations do not apply to metal and masonry saws, as the cutting mechanism and dominant kick-back mode are different from those of woodcutting saws. In this work, the kickback of abrasive saws is investigated by combining theoretical and experimental tools. A theoretical model developed based on frictional engagement during a pinch-based kickback event is shown to predict the resultant kickback energy for various saws in good agreement with experimental measurements. These measurements were obtained using a specialized machine that was designed to generate pinch-based kickback and to measure the resultant kickback energy for both chainsaws and cutoff saws. While the model can predict the resultant kickback energy for a saw given known cutting conditions (i.e. cutting angle and pinch force), it does not predict the maximum possible kickback energy given any cutting angle of a saw because it does not account for the change in speed of the cutting blade. Upon validation of the physics model, two commonly used representative saws, a Stihl TS420 and an ICS 695XL, were tested using this kickback machine to evaluate their comparative kickback risk. This work demonstrates that pinch-based kickback can be a major safety risk for abrasive saw operators, and it provides a machine and analytical framework for evaluating this risk.by Steven Burcat.S.M.S.M. Massachusetts Institute of Technology, Department of Mechanical Engineerin
Social Event for the Class of 1999
No full textPhoto of Social Event for the Class of 1999. Left to Right for the top four: Richard Burgeon, Jessica Gibson, Karri Thomson, Kevin Schmidt. Left to Right for the bottom five: Kelly Cullin, Erin Williams, Betsy Hanson, Courtney Slocum, Jenny Clemons.https://digitalcommons.butler.edu/pa_20anniversary/1145/thumbnail.jp
15th annual Colorado rare plant symposium: minutes
No full textSymposium held on September 14, 2018 at the Slocum Commons in Colorado Springs, Colorado.Moderator: Susan Panjabi (CNHP)
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