1,725,221 research outputs found
Utilization of 8630 Steel in Golf Club Irons for Improved Performance
No full textTaylorMade Golf Company currently uses a two-piece construction of a forged 4140 steel face and investment cast 8620 steel body for P790 golf club irons. The cast body is welded to the forged face and then the assembly is austenitized, quenched, and tempered to form tempered martensite. It is proposed that a material substitution of 8630 steel for 8620 steel will lead to an increase in strength with a nominal tradeoff in ductility due to the 0.1 weight percent increase in carbon. To evaluate the yield strength, tensile strength, and ductility, tensile testing was conducted on cast 8620 and 8630 steel samples that were tempered at 400°C, 430°C, and 460°C. Optical microscopy and scanning electron microscopy were also used to investigate the microstructures and fracture surfaces of the tensile bars to identify any processing defects. Results indicated that 8630 steel quenched and tempered at 400°C had an average increase of 95.6 MPa in yield strength above the currently used 8620 steel quenched and tempered at 430°C; however, 8630 steel quenched and tempered at 400°C had an average percent elongation of 4.27, whereas 8620 steel quenched and tempered at 430°C showed an average percent elongation of 7.14. The increase in carbon content from 8620 steel to 8630 steel was determined to have a statistically significant increase in yield strength with a nominal tradeoff in ductility. In addition, the increase in carbon content also led to an increased tendency to observe brittle fracture in the steel tensile samples
Eléments orbitaux d'étoiles doubles: ADS 1345, 7730 et 8630
Full text linkNous présentons de nouveaux éléments orbitaux pour les étoiles doubles visuelles ADS 1345, 7730 et 8630. Ces éléments ont été obtenus en utilisant les dernières mesures que nous avons effectuées avec le tavelographe PISCO et le télescope Zeiss de 102 cm de Merate (Italie), et celles déjà disponibles dans la littérature
Work and care: dockworkers conceptions about Brazilian port modernization law 8630/93
No full textIntroduction: Brazilian’s ports had their work organization dramatic modified by Port Modernization Law (8630/93), with great impact to occupational health. Objective: This study investigated dockworkers conceptions about the impacts of Law 8630/93 to work and health care. Method: The empirical research that
grounded the discussion had a qualitative approach and it used as instruments for obtaining data ethnographic observation and 39 in-depth dockworkers interviews. Methods triangulation was applied to the empirical material according to the conceptual framework of hermeneutical referential. Results: Since law 8630/93 was
established, dockworkers have been named as Trabalhadores Portuários Avulsos (TPAs) and they reported that their work organization, that was historically build by them, has been suffering a lot of changes, as: lower payments, uncertainty about getting ‘the job of the day’ and lost of control about their shifts. They share a neglect way of care about their health issues although having the understanding that they perform risk jobs in
a dangerous profession, surrounded by accidents. Conclusion: TPAs’ work organization has changed by Law 8630/93 and, according to them, it brought a lot of losses: real ones (lack of freedom, work control and payments) and symbolical (turning into TPAs and union neutralization). They underestimate their health issues, avoiding to seek medical treatment, a common male attitude according to the gender referential
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Analysis of arrest of aircraft using polyinyl chloride plastic cable
Full text linkArrest of an aircraft during landing or abortive take off using a PVC cable as an energy absorber incorporates simplicity, novelty, and reliability. It is the purpose of this report to evaluate the feasability of this system in terms of aircraft arrest characteristics, amount of cable required and the influence of stress waves in the steel and PVC cables generated upon engagement by the moving aircraft.Made available in DSpace on 2021-11-04T16:27:40Z (GMT). No. of bitstreams: 2
TAM618-UILU-ENG-1971-8630.pdf: 119857009 bytes, checksum: 511820d1eebb5a40fdff69095080e549 (MD5)
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