Sökning: "Per-Åke Nilsson"

Hittade 4 avhandlingar innehållade orden Per-Åke Nilsson.

  1. 1. Key Components for High Tc SQUID Magnetometers

    Författare :Per-Åke Nilsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis describes the development of key components for superconducting quantum interference device (SQUID) magnetometers in the high temperature superconductor YBa2Cu3O7 (YBCO). Such magnetometers are made for liquid nitrogen temperature operation, as opposed to low Tc devices that are confined to liquid helium. LÄS MER

  3. 2. Thin films of YBa2Cu3O7 deposited by co-evaporation, Josephson junctions, and DC-SQUIDS

    Författare :Per-Åke Nilsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; microbridge; Josephson junction; BaF2< sub>; co-evaporation; sub- #956; YBa2< sub>Cu3< sub>O7< sub>; bi-crystal; DC-SQUID; thin film; m;

    Sammanfattning : .... LÄS MER

  4. 3. Distributed Multiple Access and Service Differentiation Algorithms for Wireless Networks

    Författare :Thomas Nilsson; Per-Åke Wedin; Jerry Eriksson; Lennart Bondesson; Andrzej Duda; Umeå universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wireless Local Area Networks; Medium Access Control; Quality of Service; Resource Allocation; IEEE 802.11; IEEE 802.11e; Datatransmission; Datatransmission;

    Sammanfattning : Communicating over a wireless channel poses many unique challenges not found in wired communication because of the special characteristics of the wireless channel. The capacity in a wireless network is typically scarce as a result of the limited bandwidth and many distinct phenomenons, like attenuation and interference, that work destructively on the received signals. LÄS MER

  5. 4. Ecology, tourism and management of harbour seals (Phoca vitulina)

    Författare :Sandra M. Granquist; Anders Angerbjörn; Per-Åke Nilsson; Hrefna Sigurjónsdóttir; Arne Bjørge; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Harbour seals; Phoca vitulina; ecology; tourism; wildlife; disturbance; zoologisk ekologi; Animal Ecology;

    Sammanfattning : In cases where human and wildlife are co-using the same geographical areas and resources, management issues often get complex and stakeholder conflicts are common. The Icelandic harbour seal (Phoca vitulina) population is rapidly decreasing, but direct culling of seals still occurs. LÄS MER