Abstract: The present disclosure discloses a time service and positioning network system for an underground chain-shaped large space in a coal mine. The system adopts a base station-level network internal time synchronization method which takes an optical fiber time service as a main part and takes a satellite time service as an auxiliary part to construct a time service and positioning network system with an unified time within the ad-hoc network base stations, based on the ad-hoc network base stations linearly arranged in the underground chain-shaped large space in the coal mine. Through the network construction, the network stabilization and the network application, the system unifies the time reference of the base station-level network and improves the positioning accuracy of the network application by utilization of the base station-level network internal time synchronization method.

Abstract: The present disclosure discloses a time service and positioning network system for an underground chain-shaped large space in a coal mine. The system adopts a base station-level network internal time synchronization method which takes an optical fiber time service as a main part and takes a satellite time service as an auxiliary part to construct a time service and positioning network system with an unified time within the ad-hoc network base stations, based on the ad-hoc network base stations linearly arranged in the underground chain-shaped large space in the coal mine. Through the network construction, the network stabilization and the network application, the system unifies the time reference of the base station-level network and improves the positioning accuracy of the network application by utilization of the base station-level network internal time synchronization method.

Abstract: An apparatus, a process and a system for treating petroleum coke are provided. The apparatus includes an activation unit that is an annular furnace reactor. The system includes a first reactor, the apparatus as a second reactor, a washing and separating unit, a cooling unit, a dissolving and separating unit, a washing and drying unit, optionally a regenerating unit, optionally a drying and calcining unit and optionally an evaporation-crystallization unit. The process for producing carbon materials uses the system for treating petroleum coke. The apparatus, the process and the system can achieve continuous production, and have advantages of high activation efficiency and stable properties of the resultant carbon material products.

Abstract: The present disclosure provides a refrigerator with a lifting shelf, including a lifting shelf, a shelf driving mechanism, and a shelf stroke detection device. The shelf driving mechanism includes: a driving motor and a gear transmission mechanism, where the gear transmission mechanism includes at least one group of transmission gears, the driving motor outputs a torque through a driving output shaft, and a first pulley is disposed on the driving output shaft; a guide rail slidably connected to a support piece on the guide rail, wherein the lifting shelf is fixedly connected with the support piece; and a traction cable, where the traction cable is wound around the first pulley, and the other end of the traction cable is fixedly connected with the support piece.

Abstract: The present disclosure provides a refrigerator, including a storage compartment and a door opening or closing the storage compartment. A vacuum sealing device is disposed on the door. The vacuum sealing device includes an upper support and a lower support opposite to each other and a vacuumization assembly. The lower support is detachably connected to the door; opening cavities are formed on mutually-opposed surfaces of the upper support and/or the lower support; the upper support can move close to or away from the lower support under the drive of a driving device; the upper supports moves close to the lower support until the upper support and the lower support are butt-joined, and the opening cavities sealingly form a vacuumization region by sealing portions; the vacuumization assembly is in communication with the vacuumization region through a pipe to perform vacuumization or depressurization for the vaccumization region.

Abstract: The present disclosure provides a refrigerator with a lifting shelf, including a lifting shelf, a shelf driving mechanism, and a shelf stroke detection device. The shelf driving mechanism includes: a driving motor and a gear transmission mechanism, where the gear transmission mechanism includes at least one group of transmission gears, the driving motor outputs a torque through a driving output shaft, and a first pulley is disposed on the driving output shaft; a guide rail slidably connected to a support piece on the guide rail, wherein the lifting shelf is fixedly connected with the support piece; and a traction cable, where the traction cable is wound around the first pulley, and the other end of the traction cable is fixedly connected with the support piece.

Abstract: Provided are a supported catalyst, a preparation method therefor and use thereof, and a method for the preparation of isobutylene from halomethane. The catalyst is characterized in that it comprises a carrier and a metallic active component supported on the carrier, wherein the metallic active component comprises zinc oxide and zinc halide. On the basis of the total amount of the catalyst, by weight content, the content of zinc oxide is 0.5%-20%, the content of zinc halide is 10%-50%, and the content of the support is 40%-88%. Compared with the prior art, the catalyst of the present invention can convert halomethane into isobutylene with a high selectivity. With the reaction for preparing of isobutylene by converting bromomethane according to the method of the present invention, the conversion of bromomethane is not less than 90% and the selectivity of isobutylene is not less than 80%.

Abstract: Provided are a supported catalyst, a preparation method therefor and use thereof, and a method for the preparation of isobutylene from halomethane. The catalyst is characterized in that it comprises a carrier and a metallic active component supported on the carrier, wherein the metallic active component comprises zinc oxide and zinc halide. On the basis of the total amount of the catalyst, by weight content, the content of zinc oxide is 0.5%-20%, the content of zinc halide is 10%-50%, and the content of the support is 40%-88%. Compared with the prior art, the catalyst of the present invention can convert halomethane into isobutylene with a high selectivity. With the reaction for preparing of isobutylene by converting bromomethane according to the method of the present invention, the conversion of bromomethane is not less than 90% and the selectivity of isobutylene is not less than 80%.

Abstract: This invention relates to a composite oxide, production and use thereof as a methane selective oxidizing catalyst. The composite oxide has a composition as illustrated by the formula RhRxMoyVzO?-?, wherein the symbols are as defined in the specification. When used as a methane selective oxidizing catalyst, the present composite oxide provides a high methane conversion and a high selectivity to the aimed products.

Abstract: This invention relates to a composite oxide, production and use thereof as a methane selective oxidizing catalyst. The composite oxide has a composition as illustrated by the formula RhRxMoyVzO?-?, wherein the symbols are as defined in the specification. When used as a methane selective oxidizing catalyst, the present composite oxide provides a high methane conversion and a high selectivity to the aimed products.