Henry Geerlings

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Piezoelectric materials are used in numerous applications requiring a coupling between electrical fields and mechanical strain. Despite the technological importance of this class of materials, for only a small fraction of all inorganic compounds which display compatible crystallographic symmetry, has piezoelectricity been characterized experimentally or(More)
The effect of three types of filter on the quality of radiographs of the chest was compared. These filters improve visualization of mediastinal structures without significantly reducing the quality of the pulmonary image. In practice the Du Pont filter proved best; the quality of the central and peripheral portions of the lung image is equal to that of an(More)
A comparison of chest radiographs using two films of different gradation (Cronex 4 and Cronex L (R)) shows that the relevant structures are visualized if the technique is optimal, and that the assessment speed is not prolonged. For visualizing the peripheral vessels it seems to be particularly important to employ a technique that provides rich contrasts.(More)
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