Guns for Submarines

Of silicon and submarines

allows biologists to analyse the physical properties of biological molecules using nano techniques (Moore, 2001), while on the other it exploits these very molecules as miniature machines. After all, the most successful nanomachines ever created are those operating inside every cell. The properties and construction of complex self-assembling biological molecules are providing scientists with im...

Indoor Air Quality in Submarines

The next generation of conventional submarines will be submerged for several weeks, creating a need for regenerative air purification methods and new air monitoring instruments. Submarine air is a complex mixture of compounds, where the most obvious contaminant is metabolically produced carbon dioxide. Normal eight-hour occupational exposure limits are not applicable on a submarine, instead spe...

Challenge for Air Indoor Quality on board Submarines

Grip-Pattern Recognition for Smart Guns

This paper describes the design, implementation and evaluation of a user-verification system for a smart gun, which is based on grip-pattern recognition. An existing pressure sensor consisting of an array of 44 × 44 piezoresistive elements has been used. An interface has been developed to acquire pressure images from the sensor. The values of the pixels in the pressure-pattern images are used a...

Femtosecond Electron Guns for Ultrafast Electron Diffraction*

The photocathode radio-frequency (RF) gun is a powerful electron source to generate a high-brightness femtosecond electron beam with energies of 1~3 MeV. The RF gun based relativistic ultrafast electron diffraction (UED) is a promising new technique that has the potential to probe directly structural changes at the atomic scale with sub-100 fs temporal resolution. In this paper, we analyze the ...