The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, we investigate low-k dielectric degradation process under bipolar voltage stress and thermal anneal. We study dielectric breakdown lifetime tBD, charge to breakdown QBD and conduction current I during dielectric degradation process. Compared with conventional CV (constant voltage) TDDB, bipolar TDDB has up to 2–3x lifetime increase. We find the change of leakage current ΔI/I per polarity...
This paper establishes parametric model of the bioprosthetic heart valve via computer aided design. Dynamic finite element analysis is used along with a geometrically accurate model of the bioprosthetic heart valve. The stress distribution of cylindrical and paraboloidal valve leaflets under the same load is analyzed as the leaflets are closed. The finite element analysis results show that the stress...
The finite element software is often applied to stress analysis, which is also crucial to the design of anti-fatigue and anti-calcification of artificial heart valve. The material properties and the boundary conditions of bioprosthetic valve leaflets are defined and geometrical models are established. The linear material and the non-linear material of leaflets with different shapes are analyzed. After...
In order to improve long-term durability of bioprosthetic heart valve, stress distribution of bioprosthetic heart valve leaflets with different shapes under the same load is analyzed and compared based on finite element method. Combining traditional design theories and modern design methods, we create the cylindrical, spherical, paraboloidal and ellipsoidal curved surfaces in accordance with the geometrical...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.