A comprehensive analysis of gened relativistic spacetimes which admit a shearfree, irrotational and geodesic time-like coogruence is presented. The equations governing the models for a gened energy-momentum tensor are wrilten down. Coordinates in which the metric of such spacetimes takes on a simplified form are established. The general subwses of 'zero anisotropic stress', 'zero heat-flux vector' and 'two-component Ruids' are investigated. In particular, perfect-fluid Friedmann-Robertson-Walker models and spatially homogeneous models are discussed. Models with a variety of physically relevant energy-momentum tensors are considered. Anisowopic fluid models and viscous fluid models with heat conduction are examined. Also. models with B perfect Ruid plus a magnetic field or with pure radiation. and models with two non-collinw perfect fluids (satisfying a variety of physical conditions) are inwtigated. In particular. models with a (single) perfect Ruid which is tilting with respect to the shem-free, vorticity-free and acceleration-free time-like congruence are discussed.PACS numbers: 0420J. 9880H

Lead-zirconate-titanate (PZT) thin films were prepared on non-alkaline glass substrates widely used in liquid crystal display (LCD) devices, by plasma-assisted magnetron RF sputtering with an immersed coil. After preparation of the PZT thin film, the glass was available for use in LCD device processing. No mutual diffusion of the elements was recognized between the glass substrate and the bottom electrode. The PZT layer had a dense film structure with rectangular and columnar grains, and only its perovskite phase was crystalline. PZT thin films on a glass substrate had leakage current densities of about 10-8 A/cm2, acceptable hysteresis loop shapes with the remanent polarization (P r ) of 45 µC/cm2 and the coercive field (E c ) of 90 kV/cm. Ferroelectric properties on a glass substrate almost conform with those on a Si-based substrate.

We have made a prototype of flexible display system integrated with bend-input function. It consists of flexible display, flexible backlight unit with bending sensor, and MPU connected to PC.

Submicron semiconductive epitaxial BaTiO3 thin film was prepared on (100)MgO substrate. An epitaxi ally grown BaTiO3 film prepared by MOCVD was coated with ethanol solution of LaCl3 and heated un der a reducing atmosphere at 800-1200•Ž. The resistivity was less than 1ƒ ¶•Ecm and the carrier concen tration was in the order of 1018cm-3. The film was n-type semiconductor and the resistivity increased abruptly with the increase in temperature above 600•Ž in air because of the decrease of the carrier con centration.

The authors developed a prototype for a flexible‐display system integrated with a bend‐input function that enables users to interact with the display by flexing it. The display enables users to feel as if they are operating objects on the screen directly with their hands. This interactive intuitive interface is suitable for simple operations in application software and opens up new possibilities for flexible displays to be used as user‐interface devices.