Showing 801 - 810 of 2039 Items
Learning cognitive maps: Finding useful structure in an uncertain world
Date: 2008-05-22
Creator: Eric Chown
Byron Boots
Access: Open access
- In this chapter we will describe the central mechanisms that influence how people learn about large-scale space. We will focus particularly on how these mechanisms enable people to effectively cope with both the uncertainty inherent in a constantly changing world and also with the high information content of natural environments. The major lessons are that humans get by with a "less is more" approach to building structure, and that they are able to quickly adapt to environmental changes thanks to a range of general purpose mechanisms. By looking at abstract principles, instead of concrete implementation details, it is shown that the study of human learning can provide valuable lessons for robotics. Finally, these issues are discussed in the context of an implementation on a mobile robot. © 2007 Springer-Verlag Berlin Heidelberg.
Kyanite preserves prograde and retrograde metamorphic events as revealed by cathodoluminescence, geochemistry, and crystallographic orientation
Date: 2021-01-01
Creator: Emily M. Peterman
Michael J. Jercinovic
Rachel J. Beane
Cameron B. de Wet
Access: Open access
- Cathodoluminescence (CL) images of kyanite reveal several internal textures, including sector zoning, oscillatory zoning, and cross-cutting relationships among different domains. Many textures observed in kyanite correspond to discrete events, thereby connecting kyanite textures to the pressure–temperature (P–T) history of the rock. To evaluate the record of metamorphism preserved by kyanite, metapelites were selected from three different orogens that reflect P–T conditions ranging from amphibolite to ultrahigh-pressure (UHP) facies. Cross-correlation of variations in CL intensity, chemistry, and crystal orientation within kyanite indicate the following findings. First, the preservation of original growth zones in kyanite from poly-metamorphic rocks demonstrates that growth zoning in kyanite persists through metamorphic events and is not erased by diffusion or complete recrystallization. In some samples, kyanite retains evidence of its reaction history during growth. Second, measured changes in absolute crystallographic orientation do not correspond with changes in CL intensity in any of the measured samples, including kyanite twins. Third, both kink banding and undulatory extinction are present across all samples, consistent with rotation about in the (100)[001] slip system. Kyanite from (U)HP samples exhibits higher amplitude undulations than kyanite from lower-grade lithologies, suggesting that crystallographic orientation data may provide complementary insight about deformation along the P–T path. Fourth, specific CL and trace element signatures in kyanite can be correlated with discrete metamorphic histories; yet, CL intensity and colour are affected by multiple elements, not a single controlling element. In sum, multiple generations of kyanite can be identified by careful cross-correlation of CL and geochemical data, and when combined with crystal orientation data, kyanite provides a robust record of a rock's P–T evolution.
The organization (re)invented by its blogs
Creator: Alex Primo
Access: Open access
- This article discusses how interactions in organizational blogs participate in the emergence of the organization itself. Based on the principles of The Montreal School of organizational communication, the paper reflects on how the recursive relationship between texts and conversations in blogs, according to their affordances, mobilizes the organization and contributes to its continuing creation. In order to conduct this argument, the concept of social media, uses of organizational blogs and the main contributions of The Montreal School are analyzed. Finally, this article demonstrates how blogs contribute to the definition of the organization. Beyond their promotional potential, the blog’ role as co-creator of the organization is highlighted.
Interview with Paul Sarbanes by Diane Dewhirst
Date: 2009-09-29
Creator: Paul Sarbanes
Access: Open access
Biographial Note
Paul Sarbanes was born on February 3, 1933 in Salisbury, Maryland. He attended Princeton University and continued his studies at Balliol College of the University of Oxford as a Rhodes Scholar, then attended Harvard Law School. He served as a Democrat from Maryland in the U.S. House of Representatives from 1971 to 1977 and in the U.S. Senate from 1977 to 2007. He was the first Greek American senator and notably co-sponsored the Sarbanes–Oxley Act of 2002, which strengthened corporate governance and created a federal oversight board for the accounting industry.
Summary
Interview includes discussion of: George Mitchell’s personality; winning back the Senate majority in 1986; the Senate Majority Leader race of 1989; George Mitchell’s departure from the Senate; partisanship; and an anecdote about George Mitchell and Senator John Warner during an “old-style” filibuster.
Interview with Jim Sasser by Diane Dewhirst
Date: 2010-04-27
Creator: James 'Jim' R Sasser
Access: Open access
Biographial Note
James R. “Jim” Sasser was born in Memphis, Tennessee, on September 30, 1936. A graduate of Vanderbilt University, he was awarded a law degree in 1961, admitted to the Tennessee bar, and became active in the Democratic Party; he managed Albert Gore Sr.’s unsuccessful 1970 campaign. In 1976 he sought election and won a seat in the U.S. Senate; he was reelected to two further terms, serving until 1995. He first met George Mitchell in 1972 when they were both working on Ed Muskie’s presidential primary campaign. He worked with Senator Mitchell on the Democratic Senatorial Campaign Committee (DSCC) and the Senate Budget Committee, which Sasser chaired. In 1995, President Clinton appointed him ambassador to China, where he served until 1999.
Summary
The interview includes discussion of: Budget Committee work; 1990 budget summit; DSCC 1986 (Democratic Senatorial Campaign Committee); Democratic National Committee; and the 1972 Muskie presidential primary campaign.
George J. Mitchell Oral History Project
- Between 2008 and 2011, the Bowdoin College Library conducted an oral history project to create a collection of spoken recollections and personal impressions from individuals who have known George J. Mitchell in a variety of ways. These oral histories document his life and career from early childhood onward, with particular emphasis on his public service to Maine and to the nation, and they complement his personal papers, which are also held by Bowdoin College. Interviewees include Senator Mitchell's Waterville (Maine) friends and acquaintances; family members; college classmates; Maine legislators; political associates and competitors; campaign supporters; U.S. Senate colleagues and staff members; public agency officials; foreign policy specialists; law practice associates; public policy advocates; board members of various affiliations; and friends. Because oral history recordings are intrinsically informal, spontaneous, and candid, they characterize events and personalities in ways that are otherwise silent in the historical record. In particular, they capture personal knowledge and institutional memory about people, occasions, and processes that are rarely documented elsewhere. Thus, these oral histories provide an invaluable resource in understanding both the recent past and how individuals have played essential roles in shaping the present. TRANSCRIPT GUIDELINES Every attempt has been made to create transcripts that reflect the recorded interviews accurately. Interviewees were given the opportunity to edit their transcripts to correct errors of transcription and fact (often, for example, a recollection might have included a misremembered date or place), or to enhance clarity of expression. Additions and minor deletions or changes are indicated in the transcript by closed brackets ([ ]); more substantive omissions are noted as: [p/o] (i.e. “[phrase omitted]”). ATTRIBUTION These recordings and transcripts are provided for educational use, private study, and research. Brief quotations for academic purposes and other uses that fall within “fair use” (Title 17, United States Code) require proper attribution customary to the discipline or community. All other uses not protected by “fair use,” including derivation, publication, and reproduction, require written permission from Bowdoin College. In citing these interviews, specify the interviewee, interviewer, and interview date following the style found in the example below: George J. Mitchell, interview by Andrea L’Hommedieu, 10 May 2011, George J. Mitchell Oral History Project, Bowdoin College Library, Brunswick, Maine.
Interview with Steven Symms by Brien Williams
Date: 2009-08-11
Creator: Steven S Symms
Access: Open access
Biographial Note
Steven Symms was born on April 23, 1938, in Nampa, Idaho. He earned his degree in agriculture in 1960 from the University of Idaho. He served in the Marines for three years, worked as a private pilot and a farmer, and was editor of the Idaho Compass. In 1972 he ran as a Republican candidate for Congress, serving for four terms in the House of Representatives until 1980, when he ran for the U.S. Senate and served two terms. After leaving the Senate, he founded the consulting firm Symms, Lehn Associates, Inc. At the time of this interview, he was a partner at Parry, Romani, DeConcini & Symms, a lobbying firm in Washington, D.C.
Summary
Interview includes discussion of: Symms’s relationship with Senator Mitchell; Symms’s serving on the Environment and Public Works committee and the Senate Finance Committee with Mitchell; his and Mitchell’s work together on highway programs; their differences on the 1986 tax reform bill; partisanship; Mitchell’s efforts to get Amtrak to Portland, Maine, from Boston; the 1982 gas tax; Symms’s reaction when Mitchell was selected majority leader; characterizations of majority leaders Baker, Dole, Byrd, and Mitchell; Symms’s run against Frank Church; Symms’s decision to go from the House to the Senate; being a Republican minority in the Senate; New Republicans in the 1980s; how media has changed legislation; abortion as an issue in Congress; and Mitchell’s role in the Tower nomination.
Reconsidering Operation Condor: Cross-border Military Cooperation and the Defeat of the Transnational Left in Chile and Argentina during the 1970s
Date: 2014-05-01
Creator: Georgia C Whitaker
Access: Open access
- In this study of the roots of Operation Condor, I track the development of this unusual military alliance forged by six Southern Cone governments (Chile, Argentina, Brazil, Bolivia, Uruguay, and Paraguay) during the 1970s, as well as the push-and-pull relationship between the transnational migration of political militants and the military’s impetus for collaboration. While most accounts of Condor focus on the United States as the operation’s primary orchestrator, I contend that initial motivation for the type of cooperation that Condor would later formalize was driven not by the U.S., but by the Southern Cone militaries’ perception that Marxism had to be excised from the entire region. In addition, while Condor scholars have either ignored or minimized the role of the left as political actors and placed the blame for violence exclusively on the militaries and the United States, I draw from unpublished Argentine police records, Argentine Embassy documents, and Chilean-Argentine solidarity group publications to argue that it is essential to broaden our understanding of what both sides in this ideological confrontation were attempting to accomplish. The transnational left, never a homogenous group, evolved to meet a variety of objectives. Many militants continued to be politically active while they were in exile, and many acted in solidarity with like-minded leftists in their midst.
Digital Authoritarianism in China and Russia: A Comparative Study
Date: 2020-01-01
Creator: Laura H.C. Howells
Access: Open access
- Digital authoritarianism is on the rise around the world and threatens the data privacy and rights of both domestic and international Internet users. However, scholarship on digital authoritarianism remains limited in scope and case study selection. This study contributes a new, more comprehensive analytical framework for the study of Internet governance and applies it to the case studies of China and Russia. Special attention is paid to the still understudied Russian Internet governance model. After thorough literature review and novel data collection and analysis, this paper identifies relative centralization of network infrastructure and the extent and pace of change in governance as the most notable differences between the two models. These points of divergence may be explained by two theories; the varieties of authoritarianism hypothesis posits that different political systems face persistent and unique constraints to governance of the digital realm. The development trajectory theory argues that each country’s technological development path foreshadows the systems’ capacity for and extent of governance. This study is among the first to distinguish between Internet governance strategies of authoritarian regimes.
Répresentations de la banlieue dans le cinéma français contemporain
Date: 2020-01-01
Creator: Yaw Owusu Sekyere
Access: Open access
- Inhabitants of the poor French banlieues are rejected and isolated from the larger French society, who refuse to acknowledge their marginalization. As a result, the cycle continues where no political change is made. The French film genre, cinéma de banlieue, seeks to explain the perspectives of the underrepresented and marginalized groups within France. This honors project analyzes the representations of the banlieue through the films of La Haine (Mathieu Kassovitz), Wesh wesh qu’est-ce qui se passe ? (Rabah Ameur-Zaïmeche), Bande de filles (Céline Sciamma), Divines (Houda Benyamina), and Banlieusards (Kery James & Leïla Sy). These films focus on the themes of drugs, policial relations, the confinement of the banlieue, and the discrimination and stigmatisation that inhabitants of the poor banlieues face, all of which revolve around the idea of entrapment. This work intends to see if these representations of the banlieue, specifically on the periphery of Paris, perpetuate stereotypes, or propose a more complex dynamic.