Tetrahedral amorphous carbon (ta-C) coatings have the potential to protect biomedical implants from wear and increase their service life. This study elucidates biocompatibility, mechanical properties, adhesion, resistance of ta-C fabricated by physical vapor deposition on cobalt-chromium-molybdenum (CoCr) titanium (Ti64) alloys as well ultrahigh molecular weight polyethylene (UHMWPE). Satisfact...

Background: A bonded fixed retainer is used to stabilize the alignment of teeth. Different composites have been introduced for this purpose. This study aimed investigate wear resistance flowable nanocomposite in comparison with microhybrid composite an vitro situation. Materials and Methods: In study, 46 disk‑shaped specimens were divided into two groups: Filtek Ultimate Z250 composite. The sam...

TiN coatings with a thickness of 2 μm were deposited using the magnetron sputtering has developed rapidly over last decade in such way that it become an established process choice for deposition wide range various applications different domains as gives excellent performance many aspects. In view this, we have by Ti target at nitrogen content to study influence on mechanical properties and trib...

Copy-on-write virtual disks (e.g., qcow2 images) provide many useful features like snapshot, de-duplication, and full-disk encryption. However, our study uncovers that they introduce additional metadata for block organization and notably more disk sync operations (e.g., more than 3X for qcow2 and 4X for VMDK images). To mitigate such sync amplification, we propose three optimizations, namely pe...

background and importance: disk sequestration can be defined as a herniated disk with perforation of the fibrous ring (or outermost annulus fibrosus) and posterior longitudinal ligament with migration of the disk fragment to the epidural space. even after the introduction of high-resolution magnetic resonance imaging (mri), it is still frequently misinterpreted as neoplastic masses. unfortunate...

in the present work, the aa2124/25vol.%mosi2 composite was produced by powder metallurgy technique. the aluminum alloy 2124 powder was produced by gas atomization method and the mosi2 intermetallic particles were produced through combustion synthesis. the aa2124 matrix powder was mechanically blended with 25vol.%mosi2 using a ball milling mixer. the blended powder mixture was encapsulated and t...

Responding to the PIN cracking attacks from Berkman and Ostrovsky (FC 2007), we outline a simple solution called salted-PIN. Instead of sending the regular user PIN, salted-PIN requires an ATM to generate a Transport Final PIN from a user PIN, account number, and a salt value (stored on the bank card) through, e.g., a pseudo-random function. We explore different attacks on this solution, and pr...

In this work, effects of different tool pin profiles of flat and tapered shoulder geometries on the peak temperature in friction stir welding are investigated analytically. The developed models used for the analytical investigations considered the welding process as a combination or mixture of the pure sliding and the pure sticking. From the results, the amount of heat generation and the peak t...