Abstract: A method includes receiving first measurement data acquired by a radar based on radar signals reflected by a member of a movable device. The method also includes calculating an angle based on the first measurement data. The method also includes comparing the angle with a predetermined reference angle to obtain a difference. The method also includes adjusting an obstacle detection angle of the radar based on the difference. The method further includes causing the radar to scan an environment in the adjusted obstacle detection angle.

Abstract: A foam production method includes mixing liquid nitrogen with a foaming material to produce foam. A gas is produced in situ from liquid nitrogen. As the ratio of the volume of the gas produced by gasification of liquid nitrogen to the volume of the liquid nitrogen is relatively high, when a large gas supply flow is needed to generate a large foam flow, a liquid nitrogen storage device of a small volume can be used instead of bulky air supply devices such as high-pressure gas cylinders, air compressors, air compressor sets and the like, reducing the volume of the air supply device. In addition, the liquid nitrogen used in foaming will release nitrogen gas after the foam blast, such that the nitrogen is also able to inhibit combustion on the surface of burning materials, accelerating the extinguishing of the fire.

Abstract: The present disclosure relates to a technical field of a security detection device, and particularly, to a security detection system, comprising one or more detection devices, wherein the detection device comprises a first ray emitter, a ray receiver, and a movable frame, wherein the first ray emitter comprises a first ray source for generating first detection rays and is provided at a bottom portion of the movable frame, so that the first detection rays can penetrate through a detected object from a bottom of the detected object; the ray receiver comprises a ray detector provided on the movable frame, for correspondingly receiving the first detection rays having penetrated through the detected object; and the movable frame is movable in a direction in which the first ray emitter and the ray receiver are capable of moving through a detection region for the detected object.

Abstract: The present disclosure relates to a technical field of a security detection device, and particularly, to a security detection system, comprising one or more detection devices, wherein the detection device comprises a first ray emitter, a ray receiver, and a movable frame, wherein the first ray emitter comprises a first ray source for generating first detection rays and is provided at a bottom portion of the movable frame, so that the first detection rays can penetrate through a detected object from a bottom of the detected object; the ray receiver comprises a ray detector provided on the movable frame, for correspondingly receiving the first detection rays having penetrated through the detected object; and the movable frame is movable in a direction in which the first ray emitter and the ray receiver are capable of moving through a detection region for the detected object.

Abstract: The invention relates to a device for detecting the thickness and crown of plates and strips, belonging to the field of nuclear technology applications. The device comprises a C-frame; two ray source mounted in an upper arm of the C-frame and distributed at an interval along the width direction of a steel plate/strip; two rows of gas-pressurized ionization chamber detector arrays mounted in a lower arm of the C-frame and distributed at an interval along the moving direction of the plate/strip; collimators mounted below the two ray source, the collimators enabling the rays of each ray source to only irradiate to a corresponding row of detectors; pre-amplifier modules connected with the detector arrays; a data collector connected with the pre-amplifier modules; a data processing and displaying computer connected with the data collector; and a cooling water and pressurized air service system and a control system for ensuring system operation and monitoring.

Abstract: The invention relates to a device for detecting the thickness and crown of plates and strips, belonging to the field of nuclear technology applications. The device comprises a C-frame; two ray source mounted in an upper arm of the C-frame and distributed at an interval along the width direction of a steel plate/strip; two rows of gas-pressurized ionization chamber detector arrays mounted in a lower arm of the C-frame and distributed at an interval along the moving direction of the plate/strip; collimators mounted below the two ray source, the collimators enabling the rays of each ray source to only irradiate to a corresponding row of detectors; pre-amplifier modules connected with the detector arrays; a data collector connected with the pre-amplifier modules; a data processing and displaying computer connected with the data collector; and a cooling water and pressurized air service system and a control system for ensuring system operation and monitoring.