Study on Instability Mechanism of Extraction Structure under Undercut Space Based on Thin Plate Theory in Block Caving Method

The instability of extraction structure under the undercut space in the block caving stope presents specific characteristics: Time Release rib spalling and floor heave in ore-loading roadway and collapse of major apexes.In order to study the stress and displacement evolution law of extraction structure under undercut space and reveal the instabilit

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Guess and determine attack on E0algorithm

A guess and determine attack on E0was presented,the stream cipher that was used in the short-range wireless technology Bluetooth.In the attack,an ingenious assumption by linear approximation to diminish the number of Pie Servers values that have to be guessed was made.Futher more,a test equation to reduce the number of the guessed candidates was us

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