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Massive multiple-input multiple-output (MIMO) systems, where the base station (BS) is equipped with a large number of antennas and the mobile devices have a single antenna, can significantly enhance the system performance. In many wireless systems inter symbol interference (ISI) due to delay dispersion of the channel can dramatically affect the demodulation process of the received signals. Precodi
Vibrations in a built environment can exceed the requirements for sensitive equipment in a building or can cause annoyance to residents. Hence, there is often a need for reducing such vibrations. The vibrations can originate from ambient sources such as motorway traffic, or from internal sources such as people walking inside the building. Disturbing vibrations can be reduced by reduction measures.
In 'Rollercoaster loop shapes', (Pendrill 2005 Phys. Educ. 40 517) the author started from the observation that although textbook loops are often circular, real rollercoaster loops are not. In this paper the mathematical description of various possible loop shapes, as well as their riding properties was discussed and also how a study of loop shapes can be used in physics education.
The evolution of legal philosophy in Sweden in the first half of the 20th century basically coincides with the history of the so-called Uppsala School, which will be treated extensively in Tome 2 of this volume, in the part devoted to legal realism. Here I will be dealing with Swedish legal philosophy after that period, from the early 1940s onward, when the hitherto dominant influence of the philo
More often than not, it is asserted that Anders Vilhelm Lundstedt (1882-1955), a disciple and friend of Axel Hägerström who enthusiastically embraced the latter’s philosophical theories, (i) went to great lengths to apply those theories in the central fields of law but (ii) actually deviated from Hägerström’s teachings by introducing the complex notion of "social welfare" (or "social utility") as
Sveriges Regering fattade den 9 april 2015 beslut om en ny förordning medbestämmelser om riktvärden för buller utomhus för spårtrafik, vägar ochflygplatser vid bostadsbyggnader. Förordningen (2015:216) om trafikbullervid bostadsbyggnader träder i kraft den 1 juni 2015. I denna förordning finnsförändrade riktvärden för bullerexponering vid bostader som tillåter betydligtmer buller än tidigare, någo
In this work, we present a detailed investigation of the growth of palladium-seeded GaAs nanowires. Nanowires grown on GaAs (111)B substrates consist of three different morphologies, denoted as curly (containing multiple kinks), inclined (relative to the substrate, such as 〈001〉), and vertical. We show that the relative yield of the different types is controllable by a combination of V/III ratio a
In this study, a mathematical model was developed to simulate the jet and plume behavior in order to determine the optimum discharge conditions for different scenarios. The model was divided into two sub-models, describing respectively the near and intermediate field properties of the discharge for different inclinations and bottom slope. The lateral spreading and electrical conductivity was also
