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- Assadi, A., et al.
(författare)
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Interaction of planar polymer Schottky barrier diodes with gaseous substances
- 1994
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Ingår i: Sensors and actuators. B, Chemical. - : Elsevier. - 0925-4005 .- 1873-3077. ; 20:1, s. 71-77
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Tidskriftsartikel (refereegranskat)abstract
- Conducting polymers appear very attractive as sensor materials either as the gas-sensitive component or as a matrix for easy immobilization of a specific substrate. The planar Schottky barrier diode with poly(3-octylthiophene), P3OT, as the semiconductor is used as a sensor for the detection of different gas species. The shifts in the current-voltage (C-V) characteristics as well as the C-V characteristics of the diodes due to water and ethanol vapour, ammonia gas and nitric oxide gases are studied. Nitric oxide and ammonia give the largest and most specific changes of the C-V characteristics. Nitric oxide has a doping effect, which increases the reverse current, while ammonia is the only gas that causes a negative change in the forward bias current of the I-V curve. The planar configuration of the Schottky barrier diode facilitates the absorption of gaseous species in the environment, and provides a simple method for production of gas sensors.
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| 2. |
- Dahlquist, Magnus, et al.
(författare)
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Estimatinf the Term Structure of Interest Rates with Simple and Complex Functional Forms : Nelson & Siegel vs. Longstaff & Schwartz
- 1994
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The paper compares estimation of spot (zero-coupon) interest rates and implicit forward interest rates from Swedish Treasury bill rates and Government coupon bond yields with two functional forms for the discount function, the simple form of Nelson & Siegel (NS) and the complex form of Longstaff & Schwartz (LS). NS is much easier to use and has much better convergence properties, whereas LS is more flexible. For the data used, estimates with NS and LS are close, with only marginally better fit for LS. The fit of NS seems satisfactory for monetary policy purposes.
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| 6. |
- Tepfers, Ralejs, 1933, et al.
(författare)
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Hybrid fiber composites as non-metallic reinforcement in concrete
- 1994
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Ingår i: First Slovak Confrence on Concrete Structures, Bratislava, Slovakia, September 13-14, 1994. Publisher Slovak Technical University in Bratislava.. - 8022706965 ; , s. 26-35
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Konferensbidrag (refereegranskat)
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| 7. |
- Wessén, Magnus, et al.
(författare)
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Modelling of Pearlite Decomposition in Nodular Cast Iron
- 1993
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Ingår i: Modeling of casting, welding and advanced solidification processes - VI. - Warrendale, Pa. : The Minerals, Metals & Materials Society. - 9780873392099 ; , s. 71-78
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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