There is disclosed a solid semiconductor element which very efficiently detects information about a liquid and bidirectionally exchanges the information with the outside. This provides an inexpensive and high-capacity multilayer optical information recording medium based on a super-resolution technology. The memory cell can reduce the likelihood of gate electron injection through the gate electrode and into the charge storage elements during a Fowler-Nordheim erase by employing such tunneling barrier. A combination hibernation mode and a suspend mode is also provided that essentially maintains power to the RAM while transparently backing the RAM with the hibernation file, such that if power to the RAM is interrupted, the RAM contents are automatically restored from the hibernation file when power is restored. The stabilizing bar engages the floor in the lowered position to stabilize the conveyance with the seat assembly in the forward position. A soaking unit is provided in a plane in which the organic EL devices are provided.