in-situ-time-dependent-dielectric-breakdown-transmission-electron

<em>In Situ</em> Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices

The time-dependent dielectric breakdown (TDDB) in on-chip interconnect stacks is one of the most critical failure mechanisms for microelectronic devices. ...

Fraunhofer Institute for Ceramic Technologies and Systems

The aim of the present study was to determine the influence of gingival dimensions on the development of gingival recession following placement of artificial crowns. The study population consisted of 11 periodontally healthy patients in whom 44 maxillary anterior teeth and/or premolars had to be crowned. A total of 36 teeth (82%) had, after crown placement, a mean intracrevicular crown margin of 0.57 +/- 0.47 mm. Thirty-nine teeth without restorations served as controls. Immediately after incorporation, as well as after 3, 6, 9, and 12 months, periodontal examinations were carried out. Gingival thickness was determined sonometrically and averaged 1.25 +/- 0.40 mm. Mean periodontal probing depth was 1.80 +/- 0.54 mm. Twelve months later, crowned teeth had experienced a mean attachment loss of 0.17 +/- 0.99 mm as compared to an attachment gain of 0.18 +/- 0.46 mm at control teeth. At test teeth, the gingival margin had receded a mean of 0.43 +/- 0.74 mm. In multivariate analyses considering the correlated structure of the data employing generalized estimating equation methods, crown placement was identified as a major factor for attachment loss and development of gingival recession. In addition, a shallow probing depth and narrow band of gingiva negatively influenced the level of periodontal attachment. The present results point to the importance of a more detailed periodontal diagnosis of the dentogingival region before placement of artificial crowns.

A possible influence of gingival dimensions on attachment loss and gingival recession following placement of artificial crowns.

Early-modern Jesuit universities did not offer studies in medicine, and from 1586 onwards, the Jesuit Ratio studiorum prohibited digressions on medical topics in the Aristotelian curriculum. However, some sixteenth-century Jesuit text books used in philosophy classes provided detailed accounts on physiological issues such as sense perception and its organic location as discussed in Aristotle's De anima II, 7-11. This seeming contradiction needs to be explained. In this paper, I focus on the interst in medical topics manifested in a commentary by the Jesuits of Coimbra. Admittedly, the Coimbra commentary constituted an exception, as the Jesuit college that produced it was integrated in a royal university which had a strong interest in educating physicians. It will be claimed that the exclusion of medicine at Jesuit universities and colleges had its origin in rather incidental events in the course of the foundation of the first Jesuit university in Sicily. There, the lay professors of law and medicine intended to avoid subordination to the Jesuits and thereby provoked a conflict which finally led the Jesuit administration to refrain from including faculties of medicine and law in Jesuit universities. Towards the end of the sixteenth century, a veritable Jesuit animosity towards medicine emerged for philosophical and pedagogical reasons. This development reflects educational concerns within the Society as well as the role of commentaries on Aristotle for early-modern learning.

Christoph Sander

Fraunhofer Institute for Ceramic Technologies and Systems

In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices