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  • Schleeh, Joel, 1986, et al. (författare)
  • Cryogenic Ultra-Low Noise Amplification - InP PHEMT vs. GaAs MHEMT
  • 2013
  • Ingår i: Conference Proceedings - International Conference on Indium Phosphide and Related Materials. - 1092-8669. - 9781467361316
  • Konferensbidrag (refereegranskat)abstract
    • We present a comparative study of 130 nm high electron mobility transistors (HEMTs) fabricated on pseudomorphic InGaAs/InAlAs/InP (InP PHEMT) and InGaAs/InAlAs/GaAs (GaAs MHEMT) intended for ultra-low noise amplifiers (LNAs). The epitaxial growth, as well as the HEMT process, was performed simultaneously. When integrated in a 4-8 GHz 3-stage LNA at 300 K, the measured average noise temperature was 34 K for the GaAs MHEMT and 27 K for the InP PHEMT. When cooled down to 10 K, the InP PHEMT LNA was improved to 1.6 K, while the GaAs MHEMT LNA was only reduced to 5 K. The reason for the superior cryogenic noise performance of the InP PHEMT compared to the GaAs MHEMT in this study, was found to be a higher quality of pinch-off when cooled down.
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  • Linnell, Mikael, 1976- (författare)
  • The Constitution and Reconstitution of Risk in Crisis Preparedness and Response Training
  • 2013
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • In recent years, education and exercise in societal crisis preparedness and response activities have increasingly proliferated. Thus, we tend to spend an increasing amount of time and resources being prepared for impending but uncertain negative events. Local community representatives, public institutions and organisations within critical infrastructure are expected to hold regular exercises in order to prepare for future potential crises. Likewise, civil sector organisations are utilized to assemble engaged citizens. Voluntary organisations dealing with societal crisis preparedness and response seek new ways to capture and educate the public. At the same time, the contemporary regime in managing societal crises is as cross-sectional and interorganisational collaboration. The purpose of this paper is to explore how the risk of uncertain future events is being constituted and reconstituted in the context of two voluntary organisations dealing with societal crisis preparedness and response. What kinds of risk-categories are members being taught to prepare for, what do these categories actually comprise, and how do members prepare for them? These issues will be explored in an object-oriented approach which draws on Harold Garfinkel´s notion of oriented objects (2003), Stephen Hilgartner´s notion of risk objects (1992), and Susan Leigh Star & James Griesemer´s notion of boundary objects (1989). These different notions of objects share the basic assumption that social objects, like risks, must be mutually oriented, which means that they must be rendered in a mutually intelligible form in order to exist as social objects (Rawls 2008). 
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