Search for dissertations about: "trap model"

Showing result 1 - 5 of 85 swedish dissertations containing the words trap model.

2. 1. Nonlinear Modeling of FETs for Microwave Switches and Amplifiers

   Author : Ankur Prasad; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HEMT; symmetry; small-signal model; field-plate.; GaAs; GaN; nonlinear model; trap model; symmetrical model; trap; model;

   Abstract : The exponential growth in wireless systems require rapid prototyping of radio frequency circuits (RF) using computer-aided design (CAD) enabled models. Most of the RF circuits (e.g. switches, amplifiers, mixers, etc. READ MORE

4. 2. The mechanical Paul trap in the upper secondary physics laboratory

   Author : Sebastian Kilde Löfgren; Göteborgs universitet; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Physics education research; discipline-based education research; physics laboratory; design-based research; variation theory; model-based science; modelling; mechanical Paul trap; Paul trap.;

   Abstract : In physics, toy models are often used in popular science contexts. Further, toy models have also been used to communicate some important principles of abstract phenomena qualitatively. One such example can be found in the 1989 Nobel laureate Wolfgang Paul’s Nobel lecture. READ MORE

5. 3. Studies of Charge Transport Processes in Dye-sensitized Solar Cells

   Author : Kristofer Fredin; Anders Hagfeldt; Mukundan Thelakkat; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; solar cell; mesoporous; dye-sensitized; model; simulation; electron transport; trap distribution; Physical chemistry; Fysikalisk kemi;

   Abstract : Dye-sensitized solar cells (DSCs) have attained considerable attention during the last decade because of the potential of becoming a low cost alternative to silicon based solar cells. Although efficiencies exceeding 10% in full sunlight have been presented, major improvements of the system are however limited. READ MORE

6. 4. Assessment and reduction of the conflicts between commercial fisheries and grey seals (Halichoerus grypus) in Swedish waters

   Author : Arne Fjälling; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; conflict; fishery; grey seal; mitigate; predation; salmon; trap; konflikt; fiskeri; gråsäl; skadeförebyggande; predation; lax; fälla;

   Abstract : Along with the recovery of the Baltic Sea grey seal population from very low figures in the late 1970 's, there were clear signs of a rapidly increasing conflict between grey seals and fisheries. The set trap fisheries for salmonids seemed to be suffering the worst, but such data as were available were bard to evaluate. READ MORE

7. 5. Malthusian Progress

   Author : Jacob Weisdorf; Ekonomisk-historiska institutionen; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Social Mobility; Preventive Checks; Positive Checks; Industrial Revolution; French Revolution; Mortality; Longevity; Malthusian Model; Fertility; Industrious Revolution ; Economic Growth;

   Abstract : Some scholars maintain that pre-industrial England was held in a Malthusian ‘trap’, and that this trap prevented the sustained growth of real wages until as late as 1800. Opponents to this view argue that the structural transformations occurring in preindustrial England – urbanization, labour reallocation between sectors, and human capital investments – are features of development that are incompatible with the idea of Malthusian stagnation. READ MORE