Abstract: An internal detection system of stress concentration of an oil and gas pipeline based on unsaturated orthogonally magnetization is provided. The system comprises a detection device and a processing device; the detection device comprises a detection probe; the detection probe comprises a magnetizing device and a magnetic signal acquisition device; the magnetizing device is fixedly connected with the magnetic signal acquisition device; the magnetizing device is configured to magnetize a pipeline to be detected, so that the pipeline generates a magnetized magnetic field; the magnetic signal acquisition device is configured to acquire a magnetic signal of the magnetized magnetic field to obtain an acquired signal and send the acquired signal to the processing device; the processing device is configured to receive the acquired signal and obtain a stress concentration area of the pipeline based on the acquired signal.

Abstract: A quantum random number generator is provided that can generate more secure random numbers in consideration of at least one of imperfection of quantum bits or imperfection of a projective measurement equipment. In this generator, the functional configuration of a random number extractor differs from a conventional configuration, and the random number extractor acquires a probability distribution of measurement expectation values from information of a random number sequence for measurement basis selection used in the equipment, and at least one of information of imperfection of the equipment measured in advance, or information of imperfection of a quantum bit generator. Then, an estimation probability is calculated by using the probability distribution of the measurement expectation values, and a measurement result in a binary bit string output from the equipment is compressed by the calculated estimation probability to extract a secure random number.