| 1. |
- Lundberg, A., et al.
(författare)
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Heredopathia atactica polyneuritiformis (Refsum’s Disease) : Experiences of Dietary Treatment and Plasmapheresis
- 1972
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Ingår i: European Neurology. - : S. Karger AG. - 0014-3022 .- 1421-9913. ; 8:6, s. 309-324
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Tidskriftsartikel (refereegranskat)abstract
- The clinical data of two patients with Refsum’s disease are presented. All the cardinal symptoms and signs were present. In addition the patients had fingernails which showed peculiar abnormalities. The dietary treatment installed to reduce the phytanic acid accumulation resulted in an unexpected severe weight reduction, rapidly increasing levels of serum phytanic acid and a severe deterioration of the clinical condition. Plasmapheresis was found to be an efficient mode of treating high levels of serum phytanic acid. The patients have been observed for nearly 4 years at changing levels of serum phytanic acid. It is our opinion that a causal relationship exists between the phytanic acid accumulation and, at least, the signs of polyneuropathy.
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| 2. |
- Gustavsson, M, et al.
(författare)
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Lifetime measurements for excited states of rare-earth atoms using pulse modulation of a cw dye-laser beam
- 1979
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Ingår i: Journal of the Optical Society of America. ; 69:7, s. 984-992
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Tidskriftsartikel (refereegranskat)abstract
- By pulse-modulating a cw dye-laser beam and employing the delayed-coincidence technique, we have determined the natural radiative lifetimes of a number of atomic states in rare-earth atoms Eu, Dy, and Yb. In the measurements, which were performed on an atomic beam, exponential decay curves with good statistics were obtained using short measuring times. The general features of the technique are discussed. When possible, oscillator strengths are deduced and compared with literature values.
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| 3. |
- Lundberg, Bengt, et al.
(författare)
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Optimum transmission of elastic waves through joints
- 1979
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Ingår i: Wave motion. - : Elsevier BV. - 0165-2125 .- 1878-433X. ; 1:3, s. 193-200
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Tidskriftsartikel (refereegranskat)abstract
- An elastic wave transmitting system (e.g. a nonuniform elastic rod) consisting of an input section with constant impedance, a joint with variable impedance, and an output section with constant impedance is considered. The efficiency of energy transmission (the ratio of transmitted to incident elastic wave energy) is determined and the following optimization problem is solved for two sample cases: Given the properties of the wave transmitting system and a limited duration of the incident wave, determine the shape of this wave such that the efficiency of energy transmission is maximized. In the first case (a joint with constant impedance) the optimization problem leads to a matrix eigenvalue problem. In the second case (a joint with concentrated mass) it leads to an eigenvalue problem for an integral equation. The efficiencies obtained for the optimum incident waves are compared with those obtained for rectagular incident waves an it is found that the differences are generally small. The results, which are discussed with particular reference to the transmission of elastic wave energy through drill rod joints, can also be interpreted for e.g. shallow water waves and electromagnetic waves in a transmission line.
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