Abstract: A multilevel AC/DC power converter device includes a high-frequency power converter including a first AC port and a low-frequency power converter including a second AC port and a DC port. A power converting method includes: serially connecting the first AC port of the high-frequency power converter and the second AC port of the low-frequency power converter; operating frequency of the low-frequency power converter synchronized with frequency of an AC power source and operating the high-frequency power converter with high-frequency PWM to generate a multilevel AC voltage; controlling the multilevel AC voltage to obtain a current of an input AC port being sinusoidal and in same phase with a voltage of the AC power source. Accordingly, the input power factor approaches unity and the low-frequency power converter supplies a DC voltage to a load via a DC output port.

Abstract: A cascade bridge-type DC-AC power converter device includes a low-frequency bridge-type power converter including an AC terminal and a DC bus and a high-frequency bridge-type power converter including an AC terminal. A power conversion method includes: serially connecting the AC terminal of the high-frequency bridge-type power converter and the AC terminal of the low-frequency bridge-type power converter; operating frequency of the low-frequency bridge-type power converter synchronized with frequency of an AC source and operating the high-frequency bridge-type power converter with high-frequency PWM to generate a multilevel AC voltage. A DC power source connects to the DC bus of the low-frequency bridge-type power converter. No additional power supply circuit will be required for power supply to a DC bus of the high-frequency bridge-type power converter. Accordingly, the power circuit is simplified and the manufacturing cost is reduced.

Abstract: A pump casing for a centrifugal pump, which comprises an inlet opening, a discharge outlet, and a transition surface extending between an inner peripheral surface of the main pumping chamber and an inner peripheral surface of the discharge outlet, the transition surface arranged for separating an in use exit flow of material in the discharge outlet from an in use recirculation flow of material in the main pumping chamber. The transition surface has a cutwater having a profiled section which comprises a protrusion which extends irregularly from an otherwise generally rounded arched or U-shaped transition surface and is configured such that, in use, the velocity and/or turbulence resulting from the in use flow of the material being pumped in the main pumping chamber is reduced.

Abstract: A pump casing for a centrifugal pump, which comprises an inlet opening, a discharge outlet, and a transition surface extending between an inner peripheral surface of the main pumping chamber and an inner peripheral surface of the discharge outlet, the transition surface arranged for separating an in use exit flow of material in the discharge outlet from an in use recirculation flow of material in the main pumping chamber. The transition surface has a cutwater having a profiled section which comprises a protrusion which extends irregularly from an otherwise generally rounded arched or U-shaped transition surface and is configured such that, in use, the velocity and/or turbulence resulting from the in use flow of the material being pumped in the main pumping chamber is reduced.

Abstract: A clamping mechanism includes a supporting seat, a clamping assembly, and a pushing assembly. The clamping assembly includes a fixing member, four clamping members, and a limiting member. The fixing member is fixedly received in the supporting seat and defines a receiving hole therein. The four clamping members are partially received in the receiving hole and protrude out of the fixing member. The limiting member is sleeved around the four clamping members. The pushing assembly includes an adjusting seat, an elastic member, and a pushing member. The elastic member is received in the adjusting seat. The pushing member is partially received in the adjusting seat, and an end of the pushing member away from the adjusting seat is surrounded by the four clamping members and resists the four clamping members outwardly.

Abstract: An apparatus and method for assisting in delivering update contents in computer networks are provided. The computer networks also comprise at least one peer client, and the assistant apparatus comprises: an evaluating unit configured to evaluate a user's interaction preference according to the user's interaction history; and a prefetching unit configured to evaluate, in response to the received update notification, whether to prefetch the update contents corresponding to the update notification according to the evaluated interaction preference, and, if prefetching, obtain the update contents from at least one peer client. The corresponding method is also provided. With the apparatus and method in this invention, the update contents in computer networks can be delivered between peer clients, not via the server, which reduces the server load without impairing user experience on client side.

Abstract: A method for group messaging at a mobile terminal in autonomous network includes acquiring a message and a list of target identifiers, containing the identifiers of multiple mobile terminals to which the message is to be sent; transmitting the message via the autonomous network to any mobile terminal of the multiple mobile terminals that locates in the autonomous network, and removing the identifier of the mobile terminal from the list of target identifiers to obtain an updated list of target identifiers; generating an aggregate message, wherein the aggregate message contains the message and the identifiers in the updated list; sending the aggregate message to a base station if the length of the aggregate message does not exceed a threshold; dividing the aggregate message into multiple fragment messages and sending the multiple fragment messages to the base station if the length of the aggregate message exceeds the threshold.

Abstract: A centrifugal pump impeller includes front and back shrouds and a plurality of pumping vanes therebetween, each pumping vane having a leading edge in the region of an impeller inlet and a trailing edge, the front shroud has an arcuate inner face in the region of the impeller inlet, the arcuate inner face having a radius of curvature (Rs) in the range from 0.05 to 0.16 of the outer diameter of the impeller (D2) The back shroud includes an inner main face and a nose having a curved profile with a nose apex in the region of the central axis which extends towards the front shroud, there being a curved transition region between the inner main face and the nose. Fr is the radius of curvature of the transition region and the ratio Fr/D2 is from 0.32 to 0.65. Other ratios of various dimensions of the impeller are also described.

Abstract: An electronic apparatus controlled by a self-checking system. The self-checking system constantly detects and stores, in a limited storage, a number of state characteristics of the electronic apparatus and constantly writes over and thus deletes previous data. An operating system in the electronic apparatus transmits a reset instruction before the expiry of predetermined time intervals. The self-checking system starts a timing process when the operating system is started and resets the timing process when a reset instruction is received from the operating system. If a reset instruction is not received before the expiry of a predetermined time interval, the self-checking system stores the instantaneous state characteristic of the electronic apparatus to make preparation for a failure analysis by the user.

Abstract: A positioning mechanism includes a loading assembly and a clamping assembly. The clamping assembly includes a driver mounted on the bottom of the loading assembly, at least two sliding members driven by the driver, and at least two clamping subassemblies mounted on the top of the loading assembly. The clamping subassemblies are divided into two groups and are arranged and mounted adjacent to opposite sides of the loading assembly, and the sliding members are connected to the two groups of the at least two clamping subassemblies, respectively. The driver is capable of driving the sliding members to move away from or toward each other to enable the two groups of the clamping subassemblies to move toward or away from the loading assembly to clamp or release a workpiece on the loading assembly. The present invention further discloses a bonding device using the positioning mechanism.

Abstract: A slurry pump impeller which includes a front shroud and a back shroud each having an inner main face with an outer peripheral edge and a central axis, a plurality of pumping vanes extending between the inner main faces of the shrouds, the pumping vanes being disposed in spaced apart relation. Each pumping vane includes a leading edge in the region of the central axis and a trailing edge in the region of the outer peripheral edges of the shrouds with a passageway between adjacent pumping vanes. Each passageway has associated therewith a discharge guide vane, each discharge guide vane being disposed within a respective passageway and located closer to one or the other of the pumping vanes and projecting from the inner main face of at least one of the or each shrouds.

Abstract: A method for group messaging at a mobile terminal in autonomous network includes acquiring a message and a list of target identifiers, containing the identifiers of multiple mobile terminals to which the message is to be sent; transmitting the message via the autonomous network to any mobile terminal of the multiple mobile terminals that locates in the autonomous network, and removing the identifier of the mobile terminal from the list of target identifiers to obtain an updated list of target identifiers; generating an aggregate message, wherein the aggregate message contains the message and the identifiers in the updated list; sending the aggregate message to a base station if the length of the aggregate message does not exceed a threshold; dividing the aggregate message into multiple fragment messages and sending the multiple fragment messages to the base station if the length of the aggregate message exceeds the threshold.

Abstract: A centrifugal pump impeller includes front and back shrouds and a plurality of pumping vanes therebetween, each pumping vane having a leading edge in the region of an impeller inlet and a trailing edge, the front shroud has an arcuate inner face in the region of the impeller inlet, the arcuate inner face having a radius of curvature (Rs) in the range from 0.05 to 0.16 of the outer diameter of the impeller (D2) The back shroud includes an inner main face and a nose having a curved profile with a nose apex in the region of the central axis which extends towards the front shroud, there being a curved transition region between the inner main face and the nose. Fr is the radius of curvature of the transition region and the ratio Fr/D2 is from 0.32 to 0.65. Other ratios of various dimensions of the impeller are also described.

Abstract: A pre-adhesive syrup copolymer composition comprising an acid functional acrylate solute copolymer, a monomer solvent mixture, and a polyaziridine crosslinking agent is disclosed.

Abstract: A slurry pump impeller which includes a front shroud and a back shroud each having an inner main face with an outer peripheral edge and a central axis, a plurality of pumping vanes extending between the inner main faces of the shrouds, the pumping vanes being disposed in spaced apart relation. Each pumping vane includes a leading edge in the region of the central axis and a trailing edge in the region of the outer peripheral edges of the shrouds with a passageway between adjacent pumping vanes. Each passageway has associated therewith a discharge guide vane, each discharge guide vane being disposed within a respective passageway and located closer to one or the other of the pumping vanes and projecting from the inner main face of at least one of the or each shrouds.

Abstract: A method for group messaging at a mobile terminal in autonomous network includes acquiring a message and a list of target identifiers, containing the identifiers of multiple mobile terminals to which the message is to be sent; transmitting the message via the autonomous network to any mobile terminal of the multiple mobile terminals that locates in the autonomous network, and removing the identifier of the mobile terminal from the list of target identifiers to obtain an updated list of target identifiers; generating an aggregate message, wherein the aggregate message contains the message and the identifiers in the updated list; sending the aggregate message to a base station if the length of the aggregate message does not exceed a threshold; dividing the aggregate message into multiple fragment messages and sending the multiple fragment messages to the base station if the length of the aggregate message exceeds the threshold.

Abstract: A proxy apparatus for group messaging at a mobile terminal in the autonomous network includes an acquiring device, configured to acquire a message and the identifiers of multiple mobile terminals to which the message is to be sent; a transmitting device, configured to transmit a message via the autonomous network to one or more mobile terminals in the autonomous network; and a message aggregating device, configured to generate an aggregate message, the aggregate message containing a message and identifiers of multiple mobile terminals to which the message is to be sent, wherein the transmitting device is further configured to send the aggregate message generated by the message aggregating device to a base station of mobile terminals.

Abstract: The invention provides an electromagnetic shielding adhesive tape, comprising: a resin film layer; and an electromagnetic interference shielding layer with a sandwiched structure, which is laminated with the resin film layer and comprises: a first adhesive layer bonded to one side of the resin film layer; a second adhesive layer; and a conductive metal layer provided between the first adhesive layer and the second adhesive layer.