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Sum rules for the antenna input impedance and admittance are introduced. These identities relate the radiation resistance and conductance integrated over all frequencies with the low-frequency capacitance and inductance. They are valid for lossless antennas and particularly useful for small antennas that utilise their first resonance. Numerical results for various antennas are used to illustrate t
Objectives. The aim of the study was to investigate older persons' experiences of using mobility devices. Methods. In this qualitative study, focus group interviews were carried out with participants living in two municipalities in the south of Sweden. Occupational therapists and physiotherapists identified interested participants, 65 years or older. A total of 22 persons participated once in the
In this paper it is shown hour corresponding conics in two images can be used to estimate the epipolar geometry in terms of the fundamental/essential matrix. The corresponding conics can, be images of either planar celtics or silhouettes of quadrics. It is shown that one conic correspondence gives two independent constraints on the fundamental matrix and a method to estimate the fundamental matrix
A time-independent plasticity model using only one yield surface and capable of predicting cyclic loading is presented. Memory points are defined to monitor the loading history; these memory points have the property that they can be created as well as disappear during the load history. The generalized plastic modulus is defined from these memory points in such a way that it will be continuous and
