نتایج جستجو برای: opacity
تعداد نتایج: 7090 فیلتر نتایج به سال:
Abstract Background and Aim: The opacity of dental ceramics has important role in final appearance of all ceramic restorations. opacity of super high translucent zirconia is not clearly determined.The aim of this study was evaluating the opacity of two super high translucent zirconia (zolid fx and DD cubeX2 ) and lithium disilicate reinforced glass ceramic(IPS e.max CAD LT). Materials and Metho...
This requires calculation of the opacity κλ; this is the core task of a spectral synthesis program. The opacity can be considered to consist of a continuous opacity, and opacity due to atomic line transitions. The main contribution to the continuous opacity is due to bound-free and free-free H transitions; other major sources (H+2 molecule, photoionisation of metals) also need to be considered....
Opacity testing is formalized and studied. We specify opacity testers as well as tested systems by (timed) process algebras. We model various testers according to how sophisticated observations of tested system they can make and which kind of conclusions they can obtain. We use this technique to define several realistic security properties. The properties are studied and compared with other sec...
To investigate the performance of combined 18F-FDG Positron Emission Tomography/Computed Tomography with high-resolution CT for differentiating invasive adenocarcinoma from adenocarcinoma in situ (pre-invasive lesion) or minimally invasive adenocarcinoma in stage IA lung cancer patients with solitary ground-glass opacity nodules. This retrospective study enrolled 58 consecutive stage IA pulmona...
Recently, opacity has proved to be a very promising technique for describing security properties. Much of the work has been couched in terms of Petri nets. Here, we extend the notion of opacity to the model of labelled transition systems and generalize opacity in order to be able to represent information flow security as well as protocol security. We give precise links between opacity and other...
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