85 research outputs found
Self-driving robot on a Raspberry Pi Zero W
No full textThesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 52-53).This paper describes a MEng thesis project conducted with the Duckietown group at MIT's CSAIL. During the duration of the project, the Duckietown software suite and ROS was made to run on the Raspberry Pi Zero (Or Raspberry Pi Zero W) hardware. The chassis and size of the bot is scaled down from the original Duckiebot design. This reduced the cost for the robot. The smaller Duckiebot, called the Ducklingbot, provides insight as to how well the Duckietown software suite can scale downwards to a less-powerful system, as well as give those interested in working with Duckietown a cheaper entry point from the smaller hardware.by Bethany A. LaPenta.M. Eng
SEM analysis of ovine patellar enthesis
No full textThesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2012.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student submitted PDF version of thesis.Includes bibliographical references (p. [55-56]).In tendon injury repair, the insertion of the tendon into the bone or enthesis often determines the quality of healing and poor enthesis often leads to treatment failure. However, natural enthesis is not very well understood and it is believed that the preparation methods of previous enthesis studies corrupted the observed mineral phases present. In order to address this controversy, this research prepared two sets of samples from where the patellar tendon joins the tibia in an ovine model. One set of samples was prepared for study via SEM using aqueous solvents whereas the other set was prepared using anhydrous solvents with the intention of comparing the mineral phases present between the two sets of samples. The fibrous material observed in the set of samples prepared using aqueous solvents was determined to be a membrane sheath and not tendon and thus the results could not be compared with the anhydrously prepared samples. The electron micrographs generated from the anhydrously prepared samples are ambiguous with some of them showing the physiologically incorrect scenario of the tendon connecting directly to the trabecular bone. Due to failure in experimental setup and ambiguous data no conclusions about the effect of sample preparation on mineralization phases could be drawn. Nevertheless, this work contributed to the field of research by producing electron micrographs of the patellar enthesis region in samples used prepared using anhydrous solvents.by Bethany M. Tomerlin.S.B
The journey or the destination? Initial evidence on goal focus in adolescence
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Previous issue date: 2021-04-19The ability to set and pursue goals, termed intentional self-regulation, is a critical skill in adolescence that has been linked to long-term positive development. Less is known about goal focus, defined as formulating a goal in terms of the process or outcome of goal, in adolescence. Past research has observed that a process focus is linked with positive goal-related outcomes in adult samples, but few studies have examined adolescent goal focus. This is a critical gap, as past literature indicates that young adults tend to formulate their goals in terms of the outcomes, when a process focus may be more beneficial. The purpose of this dissertation work was to address these gaps in the literature by providing preliminary evidence on the goal focus in adolescence. Three research questions were investigated. First, are adolescents more likely to demonstrate a preference for a process or outcome goal focus? Second, what are the effects of adolescent goal focus on goal pursuit? Third, is goal focus significantly associated with backup planning? These results provide guidelines for future research and intervention programs aimed at supporting adolescent goal pursuit.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-05-01The student, Bethany Fleming Hoff, accepted the attached license on 2021-04-16 at 17:21.The student, Bethany Fleming Hoff, submitted this Dissertation for approval on 2021-04-16 at 17:26.This Dissertation was approved for publication on 2021-04-19 at 16:31.Embargo set by: Seth Robbins for item 118530
Lift date: 2023-09-17T02:34:57Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemAuthor requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Onl
An Investigation of the Activity of a Predatory Bacterium at Different Temperatures
No full textabstract: The experiments conducted in this report supported previous evidence (Bethany et al., 2019) that a newly identified predatory bacterium causes a higher rate of mortality in the biological soil crust cyanobacterium M. vaginatus when in hot soils than in cold soils. I predicted that the extracellular propagules of this predatory bacterium were inactivated at seasonally low temperatures, rendering them non-viable when introduced to M. vaginatus at room temperature. However, I found that the predatory bacterium became only transiently inactive at low temperatures, recovering its pathogenicity when later exposed to warmer temperatures. By contrast, inactivation of infectivity was complete by exposure in both liquid and dry conditions for five days at 40 °C. I also expected that its infectivity towards M. vaginatus was temperature dependent. Indeed, infection was hampered and did not cause high mortality when predator and prey were incubated at or below 10 °C, which could have been due to slowed metabolisms of M. vaginatus or to an inability of the predatory bacterium to attack in cold conditions. Above 10 °C, when M. vaginatus grew faster, time to full death of predator/prey incubations correlated with the rate of growth of healthy cultures.
The experiments in this study observed a correlation between the growth rate of uninfected cultures and the decay rate of infected cultures, meaning that temperatures that cultures that displayed a higher growth rate for uninfected M. vaginatus would die faster when infected with the predatory bacterium. Infected cultures that were incubated at temperatures 4 and 10 °C did not display death and this could have been due to lower activity of M. vaginatus at lower temperatures or the inability for the predatory bacterium to attack at lower temperatures
Exercises in Style: 21st Century Remix
No full textExercises in Style: 21st Century Remix is an extension of Raymond Queneau’s Exercises in Style, first published in French in 1947. In Queneau’s book, the same two-paragraph passage (Notation) is written in 99 different ways. In this project, THE GIST serves as “Notation,” and 40 variations ensue. The author focuses on styles that have emerged over the last 60 years and styles reflecting course work in DePaul University’s Master’s in Writing and Publishing (MAWP) program. The collection concludes with an essay on the process of writing the exercises and an appendix containing stylistic analyses for each exercise
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Plant regulatory lists in the U.S. are reactive and inconsistent - Appendix 1
No full textThis file includes supplemental information for Beaury, E.M.*, Fusco, E.J., Allen, J.M., Bradley, B.A. Plant regulatory lists in the U.S. are reactive and inconsistent. Journal of Applied Ecology. The file contains the sources for regulated plant lists, the lists themselves, and summarized findings of the study (whether taxa are listed proactively or as climate change proactive). Metadata are included in the file. *corresponding author: Evelyn M. Beaury ([email protected]), 312B Holdsworth Hall, University of Massachusetts Amherst, Amherst, MA, 01002.This work was funded by a National Science Foundation Graduate Research Fellowship (Grant No. 1451512), National Science Foundation award BCS 1740267, and USGS/NE CASC G19AC00091
Enduring Patterns: Standard Language and Privileged Identities in the Writing Classroom.
No full textThis dissertation explores the indexicality (the ideological process that links language and identity) of “standard” edited American English (SEAE), revealing common patterns that associate privileged, white students with standardness and disassociate marginalized—especially African American—students from SEAE. Importantly, this project argues that SEAE both signals identity and is rhetorically constructed as linguistically neutral. Throughout this project, I examine the presence, perpetuation, and production of ideologies related to language, standardness, and privilege—specifically standard language ideology (SLI) and whiteness—in instructors’ talk about student writing. These ideologies simultaneously justify the indexicality of SEAE and work to position SEAE as linguistically neutral, a positioning that masks the troubling indexical patterns described in this dissertation.
Drawing on interviews with composition instructors about their readings of anonymous student texts, this project suggests that indexicality and standardness are mutually informative: the non/standard features of student texts operate as indexicals for student-author identities just as perceived student-author identities influence the reading of a text as non/standard. Additionally, this dissertation analyzes standard language discourse, the discursive production and manifestation of SLI, in order to better understand the rhetorical construction of linguistic neutrality. I argue that identifying and interrogating SLD allow for a critique of not only the perceived neutrality of SEAE but also SLI.
Ultimately, this dissertation offer inroads to challenging SEAE’s indexicality and perceived neutrality, both of which offer unearned privilege to some students at the expense of others and, in the process, perpetuate race- and class-based privilege.PhDEnglish & EducationUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/84509/1/bdavila_1.pd
The Topic of the Mater Dolorosa in Dominican Meditations: scenes of Mary Bidding Farewell to Jesus at Bethany
No full textThe topic of the Mater Dolorosa in Dominican Meditations, an extensive old-Polish apocryphal work
dealing with The Passion, written around the year 1532 at the Dominican Monastery of the Holy Trinity
in Kraków, is discussed. The article examines the amplifications by the anonymous author of that work
in relation to the extremely brief reference in the Gospels to the Holy Mother’s participation in Jesus’
Passion: the only part of the New Testament to make any mention of the Holy Virgin Mary’s presence
at Christ’s death is the Gospel according to St. John 19: 25–27. A further objective of the article was to
identify the main rhetorical strategies applied in the adaptations of the Biblical text: the apotheosis of
Mary’s motherhood and the glorification of the spiritual links joining Mary and Jesus.Udostępnienie publikacji Wydawnictwa Uniwersytetu Łódzkiego finansowane w ramach projektu „Doskonałość naukowa kluczem do doskonałości kształcenia”. Projekt realizowany jest ze środków Europejskiego Funduszu Społecznego w ramach Programu Operacyjnego Wiedza Edukacja Rozwój; nr umowy: POWER.03.05.00-00-Z092/17-00
Created Spaces: Domestic Myth-Making in the Novels of Elizabeth Bowen
No full textTwentieth-century author, Elizabeth Bowen writes often of children in her various works, yet her novels and short stories could hardly be considered for the consumption or pleasure of a young audience. Nevertheless, there exists an exception within her oeuvre - The Good Tiger, a colorful and charming story with illustrations by M. Nebel detailing what happens, "when a not-so-ferocious tiger leaves the zoo". Written and published in 1965, Bowen's sole "children's story" succeeds at speaking not only of but to the adolescent figures of which she so often depicts. While the prose may be simpler, the style less dramatic, the tone and underlying message of Bowen's book resonates with and perhaps encompasses a profound theme found in the rest of her work. After a day of tea party crashing and convertible cruising, the storybook tiger finds himself in a forest, "not the forest of his dreams. There was no hot sunshine, and the trees were dark because of the rain" (23). "But I do not care", the tiger says
Paced monophasic and biphasic waveforms alter transmembrane potentials and metabolism of human fibroblasts
No full textAbstractResting transmembrane potential (TMP) of primary human fibroblast cells was altered in predictable directions by subjecting cell cultures to specific monophasic and biphasic waveforms. Cells electrically stimulated with an anodal pulse resulted in hyperpolarization while a cathodal waveform depolarized the TMP to below that of non-paced control cells. The biphasic waveform, consisting of an anodal pulse followed immediately by an inverse symmetric cathodal pulse, also lessened the TMP similar to that of the cathodal pulse. The effect of short-term pacing on the TMP can last up to 4h before the potentials equilibrate back to baseline. While subjecting the cells to this electrical field stimulation did not appear to damage the integrity of the cells, the three paced electrical stimulation waves inhibited expansion of the cultures when compared to non-paced control cells. With longer pacing treatments, elongation of the cells and electrotaxis towards the anodal polarity were observed. Pacing the fibroblasts also resulted in modest, yet very statistically significant (and likely underestimated) changes to cellular adenosine-5'-triphosphate (ATP) levels, and cells undergoing anodal and biphasic (anodal/cathodal) stimulation also exhibited altered mitochondrial morphology. These observations indicate an active role of electrical currents, especially with anodal content, in affecting cellular metabolism and function, and help explain accumulating evidence of cellular alterations and clinical outcomes in pacing of the heart and other tissues in general
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