Social sites have become extremely popular among users but have they attracted equal attention from the research community? Are they good only for simple tasks, such as tagging and poking friends? Do they present any new or interesting research challenges? In this paper, we describe the insights we have obtained implementing CourseRank, a course evaluation and planning social system. We argue t...

In this study, we develop methods to identify verbal expressions in social media streams that refer to real-world activities. Using aggregate daily patterns of Foursquare checkins, our methods extract similar patterns from Twitter, extending the amount of available content while preserving high relevance. We devise and test several methods to extract such content, using timeseries and semantic ...

PEEK is being used increasingly often in seals, bushings, bearings, and other moving parts due to its excellent mechanical tribological properties. Herein, PEEK-based composites were prepared using PI as the organic filler h-BN nano-SiO2 particles inorganic fillers. There was significant improvement properties of at conditions above glass transition temperature; coefficient friction +20P/4B/4Si...

Adhesion of regenerating bone tissue to orthopaedic implants is critical their long-term success. Titanium has excess rigidity, interferes with imaging, and complicates radiation treatment. Poly(ether-ether-ketone) (PEEK) a preferred material, but limited by biological inertness. We show that plasma immersion ion implantation (PIII) imparts osteoadhesion on 3D printed PEEK using in vitro pull-o...

Compared to conventional sheet forming operations, incremental (ISF) is a flexible technique that can achieve higher formability in terms of localized deformation. Due excellent mechanical properties and X-ray penetration, polyether-ether-ketone (PEEK) an ideal alternative titanium alloy stainless steel orthopedic applications. In this study, 3-axis desktop manufacturing system has been fabrica...

Poly-ether-ether-ketone (PEEK) is a widely used and versatile polymer. Here, we use ellipsometry to determine the wavelength-dependent optical properties of PEEK before after surface modified by plasma immersion ion implantation (PIII), technique that renders hydrophilic bio-active. Lorentz Gaussian oscillator models are fit data for extraction constants dielectric function. The effect PIII, ev...

Infants generally begin to recognize emotional expressions after 6 months of age; some reports have even observed recognition in neonates. Emotional recognition is important for social referencing, in which infants “read” their parents’ expressions to understand events. Three methods for studying how infants come to recognize emotion are described in this article: peek-aboo, matching faces and ...

OBJECTIVE This study aimed to compare the clinical and radiologic outcomes of patients with subaxial cervical injury who underwent anterior cervical discectomy and fusion (ACDF) with autologous iliac bone graft or polyetheretherketone (PEEK) cages using demineralized bone matrix (DBM). METHODS From January 2005 to December 2010, 70 patients who underwent one-level ACDF with plate fixation for...

This study investigates the retention load (RL) between ZrO₂ primary crowns and secondary polyetheretherketone (PEEK) crowns made by different fabrication methods with three different tapers. Standardized primary ZrO₂ crowns were fabricated with three different tapers: 0°, 1°, and 2° (n = 10/group). Ten secondary crowns were fabricated (i) milled from breCam BioHPP blanks (PM); (ii) pressed fro...