Abstract: A method for constructing a fixed monitoring pile for a mining area with a high phreatic water level includes: S1: prefabricating a pile foundation body, where the pile foundation body has a columnar structure, and a plurality of extension connection ports are provided at an outer side and a bottom of the pile foundation body; and S2: digging a foundation pit at a designated monitoring point; combining the pile foundation body with an extension body to form a fixed monitoring pile; placing the fixed monitoring pile into the foundation pit, such that a bottom extension body and a side extension body are inserted into the pit foundation; and backfilling and compacting. The method increases the affinity between the fixed monitoring pile and a loose layer and strengthens the fixed monitoring pile to prevent it from loosening, thereby improving measurement accuracy.

Abstract: The present application provides a continuous preparation system and method for vinylidene chloride. In the present application, by coupling two stages of high gravity reactors, the product vinylidene chloride and water vapor are distilled from a reaction system in form of an azeotrope by adopting a water vapor steam stripping method, and the product obtained using the method has high purity. In addition, by combining steam stripping and high gravity, trichloroethane and alkali solution are rapidly mixed for mass transfer, and the product vinylidene chloride is rapidly distilled from the reaction system in form of the azeotrope (based on rapid diffusion of water vapor), such that the reaction proceeds continuously towards the direction of producing vinylidene chloride, thus significantly improving the conversion rate.

Abstract: A method for constructing a fixed monitoring pile for a mining area with a high phreatic water level includes: S1: prefabricating a pile foundation body, where the pile foundation body has a columnar structure, and a plurality of extension connection ports are provided at an outer side and a bottom of the pile foundation body; and S2: digging a foundation pit at a designated monitoring point; combining the pile foundation body with an extension body to form a fixed monitoring pile; placing the fixed monitoring pile into the foundation pit, such that a bottom extension body and a side extension body are inserted into the pit foundation; and backfilling and compacting. The method increases the affinity between the fixed monitoring pile and a loose layer and strengthens the fixed monitoring pile to prevent it from loosening, thereby improving measurement accuracy.

Abstract: The present application provides a continuous preparation system and method for vinylidene chloride. In the present application, by coupling two stages of high gravity reactors, the product vinylidene chloride and water vapor are distilled from a reaction system in form of an azeotrope by adopting a water vapor steam stripping method, and the product obtained using the method has high purity. In addition, by combining steam stripping and high gravity, trichloroethane and alkali solution are rapidly mixed for mass transfer, and the product vinylidene chloride is rapidly distilled from the reaction system in form of the azeotrope (based on rapid diffusion of water vapor), such that the reaction proceeds continuously towards the direction of producing vinylidene chloride, thus significantly improving the conversion rate.

Abstract: A control flow attacks based on return address signatures comprises: using a return address as a push return address when a response is given to an interrupt service routine; generating an encrypted push return address by an XOR encryption circuit by means of an n-bit binary key generated by a pseudo random number generator; then, generating a push_address signature value by an MD algorithm signature circuit; when the response to the interrupt service routine is over, reading an n-bit binary address out of a stack to serve as a pop return address; generating an encrypted pop return address by the XOR encryption circuit; generating a pop address signature value by the MD algorithm signature circuit; comparing the push_address signature value with the pop address signature value; and determining whether or not a data processor is under a control flow attack according to a comparison result.

Abstract: The disclosure discloses a method for defending control flow attacks. When a data processor gives a response to an interrupt routine, a return address and a binary key are input to an encryption circuit to be encrypted to obtain an encrypted return address, and the obtained encrypted return address is synchronously written into a stack of the data processor and an built-in register bank; when the response given to the interrupt routine by the data processor is finished, the encrypted return address is read from the tack of the data processor and the built-in register bank; afterwards, the two encrypted return addresses are decrypted by first and second decryption circuits respectively to obtain two decrypted return addresses; and the two decrypted return addresses are compared to draw a conclusion whether the data process suffers from a control flow attack, and data processor determines to continue or terminate the routine accordingly.

Abstract: A control flow attacks based on return address signatures comprises: using a return address as a push return address when a response is given to an interrupt service routine; generating an encrypted push return address by an XOR encryption circuit by means of an n-bit binary key generated by a pseudo random number generator; then, generating a push_address signature value by an MD algorithm signature circuit; when the response to the interrupt service routine is over, reading an n-bit binary address out of a stack to serve as a pop return address; generating an encrypted pop return address by the XOR encryption circuit; generating a pop address signature value by the MD algorithm signature circuit; comparing the push_address signature value with the pop address signature value; and determining whether or not a data processor is under a control flow attack according to a comparison result.

Abstract: The disclosure discloses a method for defending control flow attacks. When a data processor gives a response to an interrupt routine, a return address and a binary key are input to an encryption circuit to be encrypted to obtain an encrypted return address, and the obtained encrypted return address is synchronously written into a stack of the data processor and an built-in register bank; when the response given to the interrupt routine by the data processor is finished, the encrypted return address is read from the tack of the data processor and the built-in register bank; afterwards, the two encrypted return addresses are decrypted by first and second decryption circuits respectively to obtain two decrypted return addresses; and the two decrypted return addresses are compared to draw a conclusion whether the data process suffers from a control flow attack, and data processor determines to continue or terminate the routine accordingly.