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Mobiltelefonen har gått igenom en enorm teknisk utveckling de senaste åren. För antennens del har det inneburit en rad förändringar och denna artikel försöker beskriva några av de nya utmaningar som antennspecialisterna idag ställs inför. Antennen är numera ofta inbyggd i telefonen och täcker fler band på högre frekvenser och som inbyggd har den betydligt sämre förutsättningar än tidigare att fung
By using a three dimensional computational method, gas flow and heat transfer have been investigated and analyzed for both cathode / anode ducts of proton exchange membrane fuel cells. The Brinkman- Forchheimer-extended Darcy model is employed to investigate the flow inside the porous layer of the duct. Effects of inertial coefficient, together with permeability, effective thermal conductivity, th
This paper presents the experimental results of two different techniques, the already known inductive degeneration technique and the new capacitive filtering technique, for reducing the phase noise in RF CMOS VCO's. The techniques are applied to two distinct VCO designs, showing that the largest phase noise reduction (up to 7 dB at 3 MHz offset frequency from the carrier) is achieved via inductive
This paper addresses the inverse problem of reconstructing a medium’s instantaneous, nonlinear response to electromagnetic excitation. Using reflection and transmission data for an almost arbitrary incident field on a homogeneous slab, we are able to obtain the nonlinear constitutive relations for both electric and magnetic fields, with virtually no assumptions made on the specific form of the rel
Regional cerebral blood flow (rCBF) measurements and clinical ratings were performed on 17 schizophrenic patients and a subgroup of 10 medication-free patients before and after treatment. While clinically exacerbated patients had normal blood flow, patients in remission showed a redistribution of flow with lower values in frontal areas. Anteroposterior ratios correlated with the degree of behavior
Value selling is often presented to be the most profitable and competitive sales practice in business markets. This paper argues that the relevant theory does not consider the consequences of introducing value selling for the relationship between the individual salesperson and buyer. This is problematic since the literature assigns most responsibilities within value selling to the salesperson. The
