1,720,985 research outputs found
Portrait of John H. Linehan, Engineering Professor, 1980-1989
No full textPortrait of John H. Linehan, Biomedical Engineering Professor, 1980-1989
Portrait of John H. Linehan, Engineering Professor, 1980-1989
No full textPortrait of John H. Linehan, Biomedical Engineering Professor, 1980-1989
Smiling portrait of John H. Linehan, Engineering Professor, 1980-1989
No full textSmiling portrait of John H. Linehan, Biomedical Engineering Professor, 1980-1989
Smiling portrait of John H. Linehan, Engineering Professor, 1980-1989
No full textSmiling portrait of John H. Linehan, Biomedical Engineering Professor, 1980-1989
A Theoretical Study of Energetic Interactions Between High Temperature Molten Materials and a Low Temperature Fluid
No full textAnalytical models have been developed to predict the hydrodynamic transients resulting from the energetic interactions between a high temperature molten material and a low temperature liquid coolant. Initially, the molten material at high temperature and pressure is separated from the low temperature fluid by a solid metal barrier. Upon contact between the molten material and solid barrier, thermal attack occurs eventually resulting in a loss of barrier integrity. Subsequently, the molten material is injected into the liquid pool resulting in energetic interactions. The analytical models have integrated a wide variety of potentially mutually-interacting transport phenomena which dominate the transient process into a deterministic scheme to predict the hydrodynamic transient process. The model calculations have been compared with the existing experimental results to show its engineering accuracy and adequacy in predicting such energetic interactions. In addition, sensitivity analyses have been performed for the models by varying the values of the major parameters to justify the values of parameters assumed in the numerical calculations. Two models have been formulated to bracket the transport of molten material to the rupture site for the reactor system. The stratified model minimized the rate of transport of material to the break location while the dispersed model maximized such transport. These two models have been applied to a reference pressure tube reactor to evaluate the pressure transients and the potential structural damages as a result of a postulated severe primary coolant blockage in a power channel. The results of the analyses indicated the following: (1) up to 12 adjacent pressure tubes could be permanently deflected, (2) up to all of the calandria tubes could be collapsed onto their associated pressure tubes, (3) the calandria vessel integrity would not be threatened by the hydrodynamic transient
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Experimental and finite element models of the contact parameters and temperature distributions in electrical injuries
No full textStudies were conducted to further an understanding of injuries due to contact with low voltage 60 Hz alternating currents. The impedance characteristics of circular and elliptical stainless steel electrodes, with areas of 0.3 to 20 cm\sp2 and circumferences of 2 to 28 cm, were analyzed in a saline tank. The saline tank resistance was inversely proportional to the product of electrode area to the one-quarter power and electrode circumference to the one-half power. To analyze the effects of contact geometry and duration on the cross-body resistance, which includes interface effects and body resistance, 100 volts was applied across the hindquarters of anesthetized hogs, between one of eight electrodes and a metal plate. The resulting current rose sharply to half the maximum, gradually reached the maximum, and then rapidly diminished to approximately zero. Average current durations varied from 24 to 326 seconds, and minimum cross-body resistances varied from 242 to 64 ohms, as the electrode size increased. Minimum cross-body resistance varied more with electrode circumference than area. To analyze the effects of contact voltage on the cross-body resistance, a voltage between 75 and 250 volts was applied across the hindquarters of anesthetized hogs, between a 2.5 cm diameter electrode and a metal plate. The voltage was applied until a cessation of current flow was observed. As the applied voltage increased from 75 to 250 volts, average current durations decreased from 225 to 4 seconds, and minimum cross-body resistances increased from 93 to 180 ohms. To measure the temperature distributions in an experimental electrical injury, thermistors were implanted prior to application of 100 volts across the hindquarters of anesthetized hogs between a 5.0 cm diameter electrode and a metal plate. Tissue temperatures were recorded every 10 seconds during the application and post-insult until all temperatures returned below 40\sp\circC. Temperatures in excess of 100\sp\circC were recorded beneath the edge of the electrode. Temperatures were significantly higher under the electrode edge than center. Two-dimensional axisymmetric finite element models of voltage and temperature distributions resulting from a disk in contact with a semi-infinite medium were developed in three stages: steady-state thermal, steady-state electrical, and transient thermoelectrical. (Abstract shortened with permission of author.
- …
