3,745 research outputs found
Mediators of Periodontal Osseous Destruction and Remodeling: Principles and Implications for Diagnosis and Therapy
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/142298/1/jper1377.pd
Calculation of nonzero-temperature Casimir forces in the time domain
We show how to compute Casimir forces at nonzero temperatures with
time-domain electromagnetic simulations, for example using a finite-difference
time-domain (FDTD) method. Compared to our previous zero-temperature
time-domain method, only a small modification is required, but we explain that
some care is required to properly capture the zero-frequency contribution. We
validate the method against analytical and numerical frequency-domain
calculations, and show a surprising high-temperature disappearance of a
non-monotonic behavior previously demonstrated in a piston-like geometry.Comment: 5 pages, 2 figures, submitted to Physical Review A Rapid
Communicatio
Hadronic interactions, precocious unification, and cosmic ray showers at Auger energies
At Auger energies only model predictions enable us to extract primary cosmic
ray features. The simulation of the shower evolution depends sensitively on the
first few interactions, necessarily related to the quality of our understanding
of high energy hadronic collisions. Distortions of the standard ``soft
semi-hard'' scenario include novel large compact dimensions and a string or
quantum gravity scale not far above the electroweak scale. Na\"{\i}vely, the
additional degrees of freedom yield unification of all forces in the TeV range.
In this article we study the influence of such precocious unification during
atmospheric cascade developments by analyzing the most relevant observables in
proton induced showers.Comment: 16 pages latex. 4 eps figure
Accuracy and Consistency of Radiographic Interpretation Among Clinical Instructors in Conjunction with a Training Program
There are inaccuracies and inconsistencies of radiographic interpretation among clinical instructors. The purpose of this investigation was to determine if a training program could improve the accuracy and consistency of instructors’ ratings of bone loss. A total of thirty-five clinical instructors consisting of periodontal faculty (periodontists and general dentists), dental hygiene faculty, and periodontal graduate students viewed projected digitized radiographic images and quantified bone loss for twenty-five teeth into four descriptive categories. Ratings of bone loss were made immediately before (pretest) and after (post-test 1) initiation of the training program and then again three months later (post-test 2). Ratings were compared to the correct choice categories as determined by direct measurement using the Schei ruler. Overall agreement with the correct choice improved over time (from 64.5 percent to 85.2 percent) with the greatest change from pretest (64.5 percent) to post-test 1 (76.5 percent). Mean and absolute differences improved in three of the four categories, but worsened in one from pretest to post-test 1. This category returned to its original high value at post-test 2. The greatest improvement in consistency among instructors’ ratings was seen in one of the four categories, which was “none” (no bone loss). Extension of the training program may further enhance the accuracy and consistency of instructors’ radiographic interpretation
Accuracy and Consistency of Radiographic Interpretation Among Clinical Instructors Using Two Viewing Systems
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/153540/1/jddj002203372006702tb04071x.pd
Accuracy and Consistency of Radiographic Interpretation Among Clinical Instructors Using Two Viewing Systems
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/153540/1/jddj002203372006702tb04071x.pd
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