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Failure Analysis Methods in Electronics Assembly Technology (2008)

Balogh, Bálint ; Gordon, Péter ; Kovács, Róbert ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Materials science forum Vol. 589 (June 2008), p. 349-354

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ISSN: 1662-9752

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: The aim of this paper is to describe a failure analysis methodology applicable to revealthe root causes of electronic assembly failures. The most relevant properties of the appliedtechniques, i.e. optical microscopy, X-ray microstructure analysis, SEM (scanning electronmicroscopy) combined with EDX (energy dispersive X-ray spectroscopy) analysis, are given. Threerecent failure analysis case studies are also presented. In case of a burnt component the microwireand the leadframe formed AlCu intermetallic compound in the length of several millimeters. Thelow joint strength of gullwing leads were deduced back to paste printing and wetting problems. Thefracture surface morphology of a joint broken on the field showed different structure from the onesbroken at room temperature. It was revealed that SnPb solder fracture surface is different at roomtemperature and above 100°C

Type of Medium: Electronic Resource

URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.589.349.pdf

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Personality correlates of faculty and course evaluations (1976)

Kovacs, Robert ; Kapel, David E.

Springer

Research in higher education 5 (1976), S. 335-344

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ISSN: 1573-188X

Keywords: Faculty and course evaluation ; student personological variables ; personality correlates

Source: Springer Online Journal Archives 1860-2000

Topics: Nature of Science, Research, Systems of Higher Education, Museum Science

Notes: Abstract This study explored the interactions of classroom experiences and selected student and faculty personality variables in faculty and course evaluations. University instructors from five disciplines and their students participated in the study. Students completed the Locus of Control Scale, Mehrabian Achievement Scale, Instructor Evaluation Form, and a semantic differential scale to assess course content and structure. Pearson and canonical correlations indicated that a student's need to achieve is significantly related to faculty evaluation. Similarly, evaluation of course content and structure was significantly related to student personality variables.