Two types of aluminum nitride (AlN) samples were oxidized in flowing oxygen between 900°C and 1150°C for up to 6 h-highly (0001) textured polycrystalline AlN wafers and low defect density AlN single crystals. The N-face consistently oxidized at a faster rate than the Al-face. At 900°C and 1000°C after 6 h, the oxide was 15% thicker on the N-face than on the Al-face of polycrystalline AlN. At 1100°C and 1150°C, the oxide was only 5% thicker on the N-face, as the rate-limiting step changed from kinetically-controlled to diffusion-controlled with the oxide thickness. A linear parabolic model was established for the thermal oxidation of polycrystalline AlN on both the Al-and N-face. Transmission electron microscopy (TEM) confirmed the formation of a thicker crystalline oxide film on the N-face than on the Al-face, and established the crystallographic relationship between the oxide film and substrate. The oxidation of high-quality AlN single crystals resulted in a more uniform colored oxide layer compared to polycrystalline AlN. The aluminum oxide layer was crystalline with a rough AlN/oxide interface. The orientation relationship between AlN and Al 2 O 3 was (0001) AlN//(101 -0) Al 2 O 3 and (11 -00) AlN//(011 -2) Al 2 O 3 .

The dangers that digital files face can seem merely the stuff of theory and risk assessment matrices until an institution experiences its first data loss; especially when those digital files represent the graduate research output of a university, the potential impact of that loss increases exponentially. The authors present a case study of the challenges one academic library has encountered in the stewardship of its electronic theses and dissertations (ETDs) over the course of a decade. This article examines the problems that can arise years after the transition from a physical to electronic collection and presents documentation solutions that can make ETD preservation and curation more effective.

Based off the following report, the following are recommended:• Establish a Change log for the website. A log that would record changes, what day they happened, and why they happened. If a new URL is created, or an old URL is removed, it should be recorded in the change log to take into consideration for analytics. • Establish a Website Assessment Policy-With all the various oddities of the library website, it is recommended that a clear assessment policy be developed. • Dynamic News Box-Investigate if the auto scrolling news box is causing "clicks" in Google's "In-PageAnalytics". If it is, see if the code can be changed so that it doesn't count as clicks. If not, make note of the anomaly to avoid it causing problems in the future. • Links-Out Documentation-Make a comprehensive list of URLs that are on the main library website that we do not have Google Analytics for so that can be factored in when looking at web statistics. • Right Side Links-Are underutilized. Either move the content to left or make it more noticeable.Perhaps links for students can be on the left and links for staff can be on the right. In order to verify if the right side links are a problem, an eye-tracking usability study should be considered. • Personal Librarians-An eye tracking usability study might be considered to see which link to the Personal Librarians page is most easily found by students. The less of the two should be removed to simplify navigation and learnability. • Hours Page Link-An eye tracking usability study might be considered to see which link to the Hours page is more visible. The less of the two should be removed to simplify navigation and learnability. • Employment-Since this is such a heavily used link, and is one of the few links Google includes in the result for TTU library, it should be moved to a more prominent location higher up on the left side. • Home Page False Positives-An observational study can be done to see how users on the main floor of the library handle the fact that the home page is the Main Library website. Users can be observed and statistics kept of how often they leave the page open while they are looking at other things. This could also be done in a usability study where students are asked to go to other websites.If the study shows that a certain percentage of use is passive, then that needs to be factored into assessments about performance of the library website. It could be that stats on the main page are false positives, and need to be removed from analysis. This would need to be declared in an official website assessment policy for the library. • Safari-The stats from 2012 show that Safari Browser was not working well with the Library website.It is recommended that testing be done to see if the library website is not preforming as quickly with some browsers or if there are other factors that are causing the Average page load time to be so high.

No abstract

No abstract