Viljo Viitanen

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There are activities aiming at abling users to dock to a wireless or wired network while visiting organisations outside the premises of their usual connection to the network. These activities, known as roaming access to network, are usually based on well-known technologies, such as RADIUS, IEEE 802.1X, VPN or HTTP redirection. On the other hand, there are(More)
A technology capable of producing large-area pressure-tolerant x-ray entrance windows of submicrometer thickness is presented. It is based on successive tungsten griddings to support a multilayered membrane consisting of polyimide, aluminum, and aluminum nitride. The aspects of design and fabrication processes are discussed with emphasis on the window foil(More)
In order to fabricate entrance windows for soft x-ray detectors, various technologies have been developed. Depending on the x-ray-detector type and the environment in which the windows are used, entrance windows must meet several, often contradictory, requirements: while good pressure tolerance and durability as well as gas tightness require thicker(More)
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