The adsorption of atomic hydrogen on a single crystal ZnO(1010) surface has been studied by scanning tunneling microscopy (STM) under ultrahigh vacuum conditions at room temperature and at elevated temperatures. High resolution STM images indicate that a well-ordered (1x1) H adlayer is formed on the ZnO(1010) surface. The STM data strongly indicate that the hydrogen adsorbs on top of the oxygen...

We determined the structures of silicon clusters in the 11-14 atom size range using the tight-binding molecular dynamics method. These calculations reveal that Si11 is an icosahedron with one missing cap, Si12 is a complete icosahedron, Si13 is a surface capped icosahedron, and Si14 is a 4-4-4 layer structure with two caps. The characteristic feature of these clusters is that they are all surfa...

Introduction: Congenital missing of maxillary lateral incisors and mandibular second premolars are one of the most common developmental dental anomalies that can affect patient’s function and aesthetics. The aim of this study was to determine the prevalence and pattern of congenital missing of lateral maxillary teeth and second mandibular premolars in patients referred to the Dental Faculty of ...

The entanglement between a ?-type three-level atom and its spontaneous emission fields is investigated. The effect of spontaneously generated coherence (SGC) on entanglement between the atom and its spontaneous emission fields is then discussed. We find that in the presence of SGC the entanglement between the atom and its spontaneous emission fields is completely phase dependent, while in absen...

For highly charged ions with 3 to 10 electrons, we derive explicit, closed form quantum states which become exact in the high charge limit. When combined with suitably renormalized experimental data across iso-electronic sequences, these quantum states provide a novel and widely applicable route to predicting electronic configurations and term values for neutral atom energy levels. Moreover, ou...

The paper extends existing models for multilevel multivariate data with mixed response types to handle quite general types and patterns of missing data values in a wide range of multilevel generalized linear models. It proposes an efficient Bayesian modelling approach that allows missing values in covariates, including models where there are interactions or other functions of covariates such as...

An important reality when studying relational databases is the fact that entries in relational tables may often be \missing" or only partially speciied. The study of such missing information has led to a rich body of work on \null values." It was recognized early on that there are many diierent types of null values, each of which reeects diierent intuitions about why a particular piece of infor...

Content syndication specifications such as Atom have become a popular mechanism to disseminate information across the Internet, with many sites providing Atom feeds for users to subscribe to and consume. Such a scenario typifies the originally intended use of Atom; however, our research has explored an alternative domain for this syndication technology. This research has evaluated Atom for its ...