Abstract: The present disclosure provides a wake-up receiver, including: a radio frequency filter configured to filter a composite signal including an input signal and a background noise signal to obtain a first filtered signal, the first filtered signal includes the input signal and a part of the background noise signal, and the input signal is a product of a modulated signal and a radio frequency carrier; a self-mixing oscillator connected to the radio frequency filter and configured to cause the first filtered signal to self-mix to obtain a mixed signal; an intermediate frequency filter connected to the self-mixing oscillator and configured to filter the mixed signal, so as to filter out the noise self-mixed signal in the mixed signal and obtain a second filtered signal, the second filtered signal includes the modulated signal; and a wake-up signal generation module connected to the intermediate frequency filter and configured to obtain a wake-up signal according to the modulated signal.

Abstract: The present invention relates to the technical field of underwater communications, and discloses a bridging transmission device for underwater wireless signals, which includes a coaxial cable and two conversion assemblies. The coaxial cable can transmit the weak electric signal. The transmission device transmits and converts wireless signals by means of signal bridging between two or among more independent intelligent terminal devices, converts the electromagnetic wave signal and the weak electric signal to each other through two groups of conversion antennas, and transmits the weak electric signal under water through the coaxial cable, so the purpose of the remote transmission of underwater wireless signals can be achieved. The conversion assembly has no need to be wired to the intelligent terminal device through an interface, so the waterproof performance is good, and the universality is high.

Abstract: The present invention relates to the technical field of underwater communications, and discloses a bridging transmission device for underwater wireless signals, which includes a coaxial cable and two conversion assemblies. The coaxial cable can transmit the weak electric signal. The transmission device transmits and converts wireless signals by means of signal bridging between two or among more independent intelligent terminal devices, converts the electromagnetic wave signal and the weak electric signal to each other through two groups of conversion antennas, and transmits the weak electric signal under water through the coaxial cable, so the purpose of the remote transmission of underwater wireless signals can be achieved. The conversion assembly has no need to be wired to the intelligent terminal device through an interface, so the waterproof performance is good, and the universality is high.

Abstract: Disclosed is a underwater high-sensitivity button switch. The underwater high-sensitivity button switch includes an upper cover, a lower cover and a hollow block; the upper cover and the lower cover are made of an elastic material; the hollow block is made of a rigid material; two ends of a through hole of the hollow block are respectively sealed by the upper cover and the lower cover; a mounting block is held in the through hole of the hollow block; the mounting block is provided with a bridge-cutoff block; the bridge-cutoff block is made of a conductive material; two unconnected lug bosses are arranged on the bridge-cutoff block; the two lug bosses are respectively connected with a conducting wire; a button fixing seat is held in the through hole of the hollow block; the button fixing seat is provided with a button cap.

Abstract: Disclosed is a underwater high-sensitivity button switch. The underwater high-sensitivity button switch includes an upper cover, a lower cover and a hollow block; the upper cover and the lower cover are made of an elastic material; the hollow block is made of a rigid material; two ends of a through hole of the hollow block are respectively sealed by the upper cover and the lower cover; a mounting block is held in the through hole of the hollow block; the mounting block is provided with a bridge-cutoff block; the bridge-cutoff block is made of a conductive material; two unconnected lug bosses are arranged on the bridge-cutoff block; the two lug bosses are respectively connected with a conducting wire; a button fixing seat is held in the through hole of the hollow block; the button fixing seat is provided with a button cap.

Abstract: The present invention provides a smart watch, comprising a case and a bracelet. The smart watch further comprises: an electronic display, a pivot, hands and a rotatable pivot mounting member; the electronic display is provided with a through-hole at a specified location; the pivot is mounted inside the case and passes through the through-hole on the electronic display, a first end of the pivot that extends out from the back of the electronic display is connected to the pivot mounting member, the pivot is driven by the pivot mounting member to rotate about the axis when the pivot mounting member is rotating; a second end of the pivot that extends out from the front of the electronic display is equipped with the hands, the hands are driven by the pivot to rotate about the axis.

Abstract: A process for preparing polyoxymethylene dimethyl ethers from methanol is disclosed. For example, the process comprises contacting methanol with at least one oxidant in the presence of at least one catalyst wherein the at least one catalyst comprises at least one Group VIB metal component, such as in an amount of from about 0.5 to about 50 wt % (in terms of metal oxide) and at least one Group VIII metal component, such as in an amount of from about 0.2 to about 20 wt % (in terms of metal oxide), and at least one molecular sieve having acidic catalytic activity, such as in an amount of from about 40 to about 95 wt %, based on the total weight of the at least one catalyst for a time sufficient to obtain polyoxymethylene dimethyl ethers.

Abstract: A process for preparing polyoxymethylene dimethyl ethers from methanol is disclosed. For example, the process comprises contacting methanol with at least one oxidant in the presence of at least one catalyst wherein the at least one catalyst comprises at least one Group VIB metal component, such as in an amount of from about 0.5 to about 50 wt % (in terms of metal oxide) and at least one Group VIII metal component, such as in an amount of from about 0.2 to about 20 wt % (in terms of metal oxide), and at least one molecular sieve having acidic catalytic activity, such as in an amount of from about 40 to about 95 wt %, based on the total weight of the at least one catalyst for a time sufficient to obtain polyoxymethylene dimethyl ethers.