14 results about "Electric devices" patented technology

The invention discloses a lightweight porous MXene-based composite film electromagnetic shielding material and a preparation method thereof, and belongs to the technical field of film electromagnetic shielding materials and preparation thereof. Self-assembly of MXene and graphene oxide is realized by taking electrostatic interaction force as driving force on MXene modified by a cationic surface modifier and graphene oxide, and then the lightweight porous MXene-based composite electromagnetic shielding material with ultrahigh specific performance is obtained through film casting and high-temperature annealing. The prepared composite film material has excellent electromagnetic shielding effectiveness and specific effectiveness, and when the thickness is only 15 [mu]m, the porous MXene-based composite film obtained by adding 5 wt% of graphene oxide can keep the electromagnetic shielding effectiveness of 49 dB or above in the whole X wave band. The preparation process is simple and easy to operate, and the material is expected to be applied to the fields of aerospace, military equipment, micro electronic equipment, civil electric appliances and the like.

A method, performed by an electronic device, of identifying location information of an external includes: obtaining map information including location information for each time interval of a mobile device based on the mobile device moving while generating noise near the external device; obtaining audio signal information about an audio signal including the noise generated by the mobile device, the audio signal being collected by a microphone of the external device; identifying, from the audio signal information, a time point at which a noise level of the noise generated by the mobile device is highest; obtaining, from the map information, location information of the mobile device corresponding to the identified time point; and identifying the location information of the external device based on the obtained location information of the mobile device.

The invention discloses an intelligent building security monitoring device. The device is characterized by comprising a main body structure, an alarm structure and a split structure; and the alarm structure is movably mounted on the main body structure, and the split structure is detachably connected to the alarm structure. The invention relates to the technical field of security and protection equipment. After the device is started, when a door body is opened, a stress block is separated from a rolling wheel, and a control rod descends under the action of a spring to make contact with contactblocks on the two sides to power on internal electric devices, a buzzer gives an alarm, and meanwhile, a signal transmission module sends alarm information to a mobile phone by virtue of a network connected with a wireless network module, so that the purpose of receiving the alarm information of illegal entry in time is achieved. The device is simple and ingenious in structure, low in cost, convenient to mount, dismount and use and capable of greatly preventing theft accidents caused by picking the lock and receiving information at the first time to avoid loss.