A demonstrates 2 active fixation pacemaker leads, one with the screw deployed (left). Panel B demonstrates 3 pacemaker leads with tines on the end, so-called passive fixation leads that are designed to catch onto muscular trabeculations in the heart.
The Medis 24-7 Power Pack is a
portable power system based on
Medis’ Direct Liquid Fuel Cell
Technology. It is designed to keep your
handheld devices operational while you
are on the go and can power or charge
many handheld devices.
Output Voltage: 3.6-5.45 Volts
Output Continuous Current: up to 220 mA
Nominal Power: up to 1 Watt
Protection: Full short circuit protection
Charge Indicator: Low power LED
Chipset: Medis Technologies Power Management
The solar-electric Helios Prototype flying wing is shown near the Hawaiian islands of Niihau and Lehua during its first test flight on solar power from the U.S. Navy's Pacific Missile Range Facility on Kauai, Hawaii, July 14, 2001.
July 14, 2001
NASA Photo / Nick Galante/PMRF
Technicians for AeroVironment, Inc., jack up a pressure tank to the wing of the Helios Prototype solar-electric flying wing. The tank carries pressurized hydrogen to fuel an experimental fuel cell system that powered the aircraft at night during an almost two-day long-endurance flight demonstration in the summer of 2003.
March 4, 2003
NASA Photo / Tom Tschida
This is a diagram of a basic PEMFC Proton Exchange Membrane Fuel Cell.
The diagram shows the anode, cathode, hydrogen, oxygen paths, gas diffusion backing, catalyst electrode layer, PEM membrane.