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日期:2024-05-22
In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture[1]) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil.[2] It is a dimensionless number that is a quantitative mea...
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日期:2024-05-22
On a camera, the aperture setting is usually adjusted in discrete steps, known as f
-stops. Each "stop" is marked with its corresponding f-number, and represents ......
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日期:2024-05-19
1.1 Numerical aperture versus f-number; 1.2 Working (effective) f-number .... The
two equalities in the equation above are each taken by various authors as the ......
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日期:2024-05-18
eBay's Vehicle Purchase Protection covers only certain vehicle transactions that are completed ON eBay.com. If a Craigslist seller "promises" you eBay protection programs, walk away. It is fraudulent. Learn more. Common warning signs: A great deal that .....
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日期:2024-05-17
Case citation is a system used in many countries to identify past court case decisions, either in series of books called reporters or law reports, or in a "neutral" style that identifies a decision regardless of where it is reported. Case citations are fo...
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日期:2024-05-21
Listed in alphabetical order. Some of the free offerings may expire and new files may be available. Some services require sign up and some do not. Here you find hi-res files from 24/48K to 24/192K, DSD and beyond. I try my best to make sure these are all ...
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日期:2024-05-17
Links to documents - Welcome to the United Nations: It's Your World...
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日期:2024-05-18
Executive Summary – 3GPP Release 11: Understanding the Standards for HSPA+ and LTE-Advanced Enhancements (August 2013) By 4G Americas This summary is intended to provide a brief review of some of the key specifications in 3GPP Release 11. MIMO ......