1,721,521 research outputs found
Photograph from a Collection on David Howard Tribou
No full textBlack and white photograph from the Alfred Greer Hempstead collection on David Howard Tribou. No information provided on location or date. Appears to be a photograph of Tribou early in his career as a chaplain in the United States Navy.https://digitalcommons.library.umaine.edu/spec_photos/1156/thumbnail.jp
Low power-electrical isolation for EKG monitoring equipment
No full textThesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1979.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.Includes bibliographical references.by David Howard Turkel.B.S
75th Anniversary. University of Idaho. Homer David, Howard David, Dr. L.H. Chamberlain, Earl David, and James H. Roper. [246-25]
No full text1964 photograph of 75th Anniversary. Homer David, Howard David, Dr. L.H. Chamberlain, Earl David, and James H. Roper. [PG1_246-25
The development of criteria to distinguish glaciotectonic and glaciomarine sedimentary environments
No full textThe palaeoenvironmental interpretation of many of Britain's glaciogenic sedimentary formations has been highly contentious over the last decade. The main reason for this has been a renewed interest in glaciomarine environments, which has led to a number of contrasting glacial sedimentary reconstructions within the glaciological literature. In particular, there has been vigorous debate between those advocating glaciotectonic models and others who have favoured glaciomarine models, with many of Britain's more complex glacial formations being subjected to glaciomarine re-interpretations.These differences in interpretation have arisen as a basic consequence of glacioterrestrial and glaciosubaquatic processes producing sediments that in many instances are visually very similar. This is particularly the case where glacial diamicts are deposited, as distinguishing sedimentary features of any kind are often lacking. The correct identification of such deposits is essential not only for the accurate assessment of contemporary and ancient glaciogenic sedimentary processes, but also for the wider implications that relate to ice sheet behaviour, sea-level and climate interaction. If the sedimentary processes that control glacier dynamics cannot be understood, the correct prediction of the future relationships between glaciers and their broader environment will not be possible.This research has attempted to identify criteria to distinguish glaciotectonic and glaciomarine sediments using macroscale and microscale analytical techniques. On the macroscale these include analysis of: lithofacies associations, sedimentological and structural style, and macrofabric data. The utilisation of macroscale analysis alone however, cannot identify the features which make one glacial deposit distinct from another and sedimentary micromorphological techniques have been extensively applied in order to accurately reconstruct sediment history. The methodology that has been adopted necessitates the investigation of a number of contemporary glacioterrestrial and glaciomarine environments from which a range of glaciogenic sedimentary criteria have been established. Having established these criteria, they have been used to test the depositional origins of a number of Quaternary glaciogenic formations that have recently been the subject of contradictory glacioterrestrial and glaciomarine models.This research shows that subglacial glaciotectonic sediments are deposited and deformed by a range of ductile and brittle shear mechanisms which determine the structural morphology of the sediment matrix. Ductile intergranular pervasive shear mechanisms tend to produce massive, isotropic sediment matrices in contrast to brittle shear mechanisms which impart a higher degree of anisotropic character to a sediment matrix. The interrelationship between these two shear mechanisms, and the rheological controls that determine their distribution may play a dominant role in the stratified form of many subglacial diamicts. (DX191283)</p
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Transport characteristics of large Wood in headwater streams: insights from a restoration field study and physical modelling
No full textFluvial systems and their effective functioning are of the utmost importance. Large wood, although recognised as a potential hazard, is also an essential component in the majority of headwater streams. The amount of large wood in many watersheds is being purposefully increased due to rewilding, restoration or natural flood management projects, however, the relationships between the key drivers that determine large wood processes are not fully understood. The relationships between large wood loading and geomorphic complexity, as well as the effects of large wood loading, large wood configuration and large wood piece characteristics on large wood transport, are explored in this thesis. The approaches that have been used to investigate the research questions include original empirical field research, original scaled physical modelling and published empirical field research. Reach scale geomorphic complexity in relation to large wood loading has been quantified (positive correlation). The effect of configuring large wood as structures mimicking logjams (post-assisted log structures) has been shown to increase large wood retention and decrease median large wood transport distances. Additionally, the large wood piece characteristics dimensionless length and dimensionless diameter are related to large wood movement status and large wood transport distance. The large wood near functional immobility threshold has been refined, and very short dimensionless length (0–0.35) and small to moderate dimensionless diameter (0.1–0.4) large wood pieces are transported the greatest distances. The implications of these findings are that large wood processes are now better understood, particularly in a restoration context. As there are feedbacks between key large wood process parameters including large wood loading, geomorphic complexity and large wood transport, good understanding of these processes is vital to minimise uncertainty and error propagation so that meaningful estimations can be achieved. Better forecasting of system state changes in relation to large wood can be utilised to predict how a system may respond to large wood manipulations, thus enhancing decision-making relating to large wood. In particular, this is crucial for rewilding, restoration or natural flood management projects, especially as specific configurations of treatment wood can promote greater large wood retention and geomorphic complexity. Additionally, understanding the likelihood of movement and the potential transport distances for individual large wood pieces helps to quantitatively assess large wood hazard
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