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... its circular shape (but it still has a sharp edge on a smaller scale) the shape of the point-source Arago spot changes ... Note that this is only the case if the source is close to an ideal point source ... From an extended source the Arago spot is only affected marginally, since one can interpret the Arago spot as a point-spread function ...
... For an ideal point source the intensity of the Arago spot equals that of the undisturbed wave front ... peak depends on the distances between source, circular object and screen, as well as the source's wavelength and the diameter of the circular object ... means that one can compensate for a reduction in the source's wavelength by increasing the distance l between circular object and screen or reducing the circular object's diameter ...
... Raymond about the social workings of open-source software development ... anthropological roots of the gift culture in open source as contrasted with the exchange culture of closed source software ... Raymond also investigates the nature of the spread of open source into the untamed frontier of ideas he terms the noosphere, postulating that ...
... Unsealed source radiotherapy relates to the use of soluble forms of radioactive substances which are administered to the body by injection or ingestion ... Sealed-source therapy, in which the radioisotope remains in a capsule or metal wire during therapy and is never allowed to dissolve in fluids, is usually referred to as brachytherapy ...
... it could be quickly developed into a practical power source ... However, as with other fusion experiments, development into a power source has proven difficult ... Nevertheless, the fusor has since become a practical neutron source and is produced commercially for this role ...
Famous quotes containing the word source:
“It is the child in man that is the source of his uniqueness and creativeness, and the playground is the optimal milieu for the unfolding of his capacities and talents.”
—Eric Hoffer (1902–1983)
“The child knows only that he engages in play because it is enjoyable. He isn’t aware of his need to play—a need which has its source in the pressure of unsolved problems. Nor does he know that his pleasure in playing comes from a deep sense of well-being that is the direct result of feeling in control of things, in contrast to the rest of his life, which is managed by his parents or other adults.”
—Bruno Bettelheim (20th century)
“Discourses on humility are a source of pride in the vain and of humility in the humble. So those on scepticism cause believers to affirm. Few men speak humbly of humility, chastely of chastity, few doubtingly of scepticism.”
—Blaise Pascal (1623–1662)