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Article processing fees for journals indexed in the Directory of Open Access Journals (2019). Journals use a variety of ways to generate the income required to cover publishing costs (including editorial costs, any costs of administering the peer review system), such as subsidies from institutions [7] and subscriptions.
Ultraviolet filters for protecting a camera from ultraviolet radiation. An astronomical filter is a telescope accessory consisting of an optical filter used by amateur astronomers to improve the details and contrast of celestial objects, either for viewing or for photography.