Dynamic performance of parallel link suspension with seek motion during contact-sliding
Seek behavior and orientation of a contact-sliding head were investigated for two types of suspension with a ball slider. In a fundamental measurement, a seek behavior of the ball slider with a parallel link suspension was independent of kinetic friction in the sliding direction. A torsional displacement of the ball slider was inverse proportional to a ratio of torsional rigidity between a single beam and a parallel link suspension. In a dynamic measurement on a rotary disk, the ball slider with the single beam bounced intensely and showed large torsional displacement. While the parallel link suspension showed negligible torsion and kept stable orientation during seek motion.
Contact perpendicular recording on rigid media
The authors describe integrated head/flexure structures which have an effective mass of about 300 mu g, evidence no indication of head crash, and hold the potential for very low wear of both head and media, when operating in continuous sliding contact at media velocities of 15 m/s or greater. A perpendicular probe type transducer was constructed as an integral part of a thin dielectric flexure. Initial recording performance on two-layer perpendicular media indicates promise for achieving very high linear and track densities, and the extremely small mass facilitates the design of servo systems and actuators capable of substantially reducing track access time. >
CULTURE, SUSTAINABLE URBAN DEVELOPMENT AND URBAN REGENERATION
Concerns about the conflict between economy, development on one hand and urban cultural heritage on the other hand, have made the urban development to be lately one of the most important themes at European level. Also, another issue of concern is social equity, aiming to strike a balance between economic development and equal access to culture for all generations of inhabitants of urban communities. Basically, ensuring these balances between urban cultural heritage, economy and social equity we express the essence of the concept of sustainable development from the perspective of culture. Urbanization is an ongoing process in all the cities of the world, but urban cultural heritage is a crucial element in the development of the cities and has an important impact over the quality of life of that community. Castles, churches, fortresses, squares and public buildings all contribute at the creating of the community history and of their characteristics.