Abstract: Provided is a method for retrieving a lost-of-contact mobile terminal. The method is applied to a first control terminal, and includes: receiving a first lost-of-contact distress signal a first mobile terminal forwarded by a server; displaying a help seeking interface; sending, in response to a help-retrieving instruction, a first help-retrieving request to the server; and receiving a first confirmation help message from a second control terminal from the server, wherein the first confirmation help message indicates that the second control terminal agrees to help retrieve the first mobile terminal.

Abstract: Provided is a three-dimensional measurement device, including an illumination system (I) and an imaging system (II). The illumination system includes, along an illumination light path, a light source (8), a light beam shaping apparatus (8), a pattern modulation apparatus (6), and a projection lens (2). The pattern modulation apparatus is configured to form a coded pattern. The light beam shaping apparatus is configured to shape light emitted by the light source into near-parallel light. The projection lens is configured to project the coded pattern onto a target object. The imaging system includes an imaging lens (3), a first beam-splitting system (12, 13), and an image sensor group including N image sensors (9, 10, 11). The first beam-splitting system is configured to transmit the coded pattern received by the imaging lens and projected onto the target object to the N image sensors of the image sensor group.

Abstract: Provided is a method for processing video data. The method includes: acquiring a second outline of at least one object in an (n+1)th image frame of a to-be-compressed video data group based on a fuzzy algorithm; determining a motion vector of the at least one object according to the second outline and a first outline of the at least one object in an nth image frame of the to-be-compressed video data group; acquiring compressed video data according to the motion vector and a start image frame of to-be-compressed video data; and sending the compressed video data to an apparatus for displaying images.

Abstract: A terminal resistance circuit, a chip and a chip communication device are provided. The terminal resistance circuit can be used for a high-speed differential I/O pair and includes two resistance circuits and a control circuit. An end of the two resistance circuits connected in series is connected to a first interface and another end is connected to a second interface. A conductor wire connected between the two resistance circuits has a target node thereon. The two resistance circuits are symmetrically arranged relative to the target node. The control circuit is connected to the two resistance circuits individually and used to control the two resistance circuits each to be in a turn-off state during powering-on of the chip. An abnormal operation caused by a short circuit between two interfaces of a I/O pair during the powering-on of the chip is avoided and the working stability of the chip is improved.

Abstract: Provided are a digital-to-analog conversion circuit and method. The digital-to-analog conversion circuit includes a conversion unit and a first regulating unit. The conversion unit includes a first code value receiving terminal used to receive a first code value, and the conversion unit is used to convert the first code value into an analog signal. The first regulating unit includes a second code value receiving terminal used to receive a second code value. A signal input terminal of the first regulating unit is connected to a signal output terminal of the conversion unit. The first regulating unit is used to acquire a first analog regulation signal according to the second code value, and regulate, by using the first analog regulation signal, an analog signal transmitted by the conversion unit.

Abstract: A terminal resistance circuit, a chip and a chip communication device are provided. The terminal resistance circuit can be used for a high-speed differential I/O pair and includes two resistance circuits and a control circuit. An end of the two resistance circuits connected in series is connected to a first interface and another end is connected to a second interface. A conductor wire connected between the two resistance circuits has a target node thereon. The two resistance circuits are symmetrically arranged relative to the target node. The control circuit is connected to the two resistance circuits individually and used to control the two resistance circuits each to be in a turn-off state during powering-on of the chip. An abnormal operation caused by a short circuit between two interfaces of a I/O pair during the powering-on of the chip is avoided and the working stability of the chip is improved.

Abstract: An oscillation maintenance circuit with comparator-based pulse generation is provided. By sampling an RF signal and controlling a pulse generation circuit to generate a pulse signal of the same frequency as the RF signal, a switch unit is controlled to be ON/OFF at a same frequency as the RF signal, achieving synchronization between change of the current injection and the RF signal. Thus, the oscillation frequency is not affected by current injection, ensuring the FSK communication performance. At the same time, two comparators are respectively compared with two reference voltage levels to obtain an output pulse signal, and the reference voltage levels can be adjusted according to practical requirements, so that the switch-on point of time and current injection time duration are adjustable, maximizing the efficiency of current injection, resulting in simple circuit structure, low power consumption, and increased communication distance of an HDX passive RFID transponder.

Abstract: A half-duplex RFID oscillation maintenance circuit with trigger-based pulse generation is provided, including: a resonance inductor and a resonance capacitor forming an L-C resonance circuit coupled to an external radio frequency field to generate alternating current for a rectifier circuit, which is connected to an energy-storage capacitor. A first antenna end is connected to a trigger circuit through a switch unit and a resistor connected in series; and an output end of the trigger circuit is connected to a control end of the switch unit. The trigger circuit is configured to sample an oscillation signal at the first antenna end to generate a rectangular wave signal, whose pulse width can be self-adaptively adjusted, to control OFF/ON of the switch unit and, when the switch unit is ON, to form a current injection loop from the energy-storage capacitor to the L-C resonance circuit.

Abstract: A half-duplex RFID oscillation maintenance circuit with trigger-based pulse generation is provided, including: a resonance inductor and a resonance capacitor forming an L-C resonance circuit coupled to an external radio frequency field to generate alternating current for a rectifier circuit, which is connected to an energy-storage capacitor. A first antenna end is connected to a trigger circuit through a switch unit and a resistor connected in series; and an output end of the trigger circuit is connected to a control end of the switch unit. The trigger circuit is configured to sample an oscillation signal at the first antenna end to generate a rectangular wave signal, whose pulse width can be self-adaptively adjusted, to control OFF/ON of the switch unit and, when the switch unit is ON, to form a current injection loop from the energy-storage capacitor to the L-C resonance circuit.

Abstract: An oscillation maintenance circuit with comparator-based pulse generation is provided. By sampling an RF signal and controlling a pulse generation circuit to generate a pulse signal of the same frequency as the RF signal, a switch unit is controlled to be ON/OFF at a same frequency as the RF signal, achieving synchronization between change of the current injection and the RF signal. Thus, the oscillation frequency is not affected by current injection, ensuring the FSK communication performance. At the same time, two comparators are respectively compared with two reference voltage levels to obtain an output pulse signal, and the reference voltage levels can be adjusted according to practical requirements, so that the switch-on point of time and current injection time duration are adjustable, maximizing the efficiency of current injection, resulting in simple circuit structure, low power consumption, and increased communication distance of an HDX passive RFID transponder.

Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a Pd- and/or Pt-based catalyst component and a USY-type zeolite. By using the catalyst, a hydrocarbon containing propane or butane as a main component, i.e. a liquefied petroleum gas, can be produced with high activity, high selectivity and high yield from at least one of methanol and dimethyl ether.

Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a Pd- and/or Pt-based catalyst component and a USY-type zeolite. By using the catalyst, a hydrocarbon containing propane or butane as a main component, i.e. a liquefied petroleum gas, can be produced with high activity, high selectivity and high yield from at least one of methanol and dimethyl ether.

Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a Pd-based methanol synthesis catalyst component and a ?-zeolite catalyst component. It can be used in a reaction of carbon monoxide and hydrogen to give a hydrocarbon containing propane or butane as a main component, i.e., a liquefied petroleum gas, with high activity, high selectivity and high yield. Furthermore, the catalyst has a longer catalyst life with less deterioration.

Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a methanol synthesis catalyst component in which an olefin-hydrogenation catalyst component is supported on a Zn—Cr-based methanol synthesis catalyst, and a zeolite catalyst component. It can be used in a reaction of carbon monoxide and hydrogen to give a hydrocarbon containing propane or butane as a main component, i.e., a liquefied petroleum gas, with high activity, high selectivity and high yield. Furthermore, the catalyst has a longer catalyst life with less deterioration.

Abstract: A hydrocarbon gas containing propane or butane as a main component, i.e., a liquefied petroleum gas is produced by passing a raw material gas comprising at least one selected from the group consisting of methanol and dimethyl ether, and a synthesis gas through a catalyst layer comprising a catalyst for producing a liquefied petroleum gas.

Abstract: Crude methanol or crude dimethyl ether containing carbon monoxide and/or carbon dioxide is produced from the synthesis gas, which is produced from a carbon-containing starting material such as a natural gas, and then a hydrocarbon containing propane or butane as a main component, i.e., a liquefied petroleum gas is produced from the crude methanol or the crude dimethyl ether.

Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a Pd-based methanol synthesis catalyst component and a ?-zeolite catalyst component. It can be used in a reaction of carbon monoxide and hydrogen to give a hydrocarbon containing propane or butane as a main component, i.e., a liquefied petroleum gas, with high activity, high selectivity and high yield. Furthermore, the catalyst has a longer catalyst life with less deterioration.

Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a Pd— and/or Pt-based catalyst component and a USY-type zeolite. By using the catalyst, a hydrocarbon containing propane or butane as a main component, i.e. a liquefied petroleum gas, can be produced with high activity, high selectivity and high yield from at least one of methanol and dimethyl ether.

Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a Pd-based methanol synthesis catalyst component and a ?-zeolite catalyst component. It can be used in a reaction of carbon monoxide and hydrogen to give a hydrocarbon containing propane or butane as a main component, i.e., a liquefied petroleum gas, with high activity, high selectivity and high yield. Furthermore, the catalyst has a longer catalyst life with less deterioration.