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CAPTCHA (also known as verification code) is mainly used to guarantee the login security of the interactive websites. At present, the most popular verification code is image CAPTCHA which can distinguish the human user from the computer by identifying characters in the image. Although the image CAPTCHA is safe at beginning, great deals of CAPTCHAs have been cracked by the computers along with the...
This paper proposes a new method for shielding the ambient magnetic field in a CRT. The key to the method is the use of U-shaped magnetic sheets arranged around the frame of the CRT. The sheets are magnetized by the ambient field, and create a demagnetizing field to cancel the field perpendicular to the screen. They are thus an effective means of reducing mislanding. For example, mislandings at the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.