منابع مشابه
Mechanical design of a power-adjustable spectacle lens frame.
Power-adjustable spectacle lenses, based on the Alvarez-Lohmann principle, can be used to provide affordable spectacles for subjective refractive errors measurement and its correction. A new mechanical frame has been designed to maximize the advantages of this technology. The design includes a mechanism to match the interpupillary distance with that of the optical centers of the lenses. The fra...
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• References Introduction This paper presents an overview of operator adjustable equalizers in the professional audio industry. The term “operator adjustable equalizers” is no doubt a bit vague and cumbersome. For this, the author apologizes. Needed was a term to differentiate between fixed equalizers and variable equalizers. Fixed equalizers, such as pre-emphasis and de-emphasis circuits, phon...
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ژورنال
عنوان ژورنال: JAMA: The Journal of the American Medical Association
سال: 1913
ISSN: 0098-7484
DOI: 10.1001/jama.1913.04350070044016