Abstract: An inclined waved board and a heat exchanger thereof. The inclined waved board includes a board body composed of continuous waved sections. The waved sections are respectively inclined from a first side to a second side, and a third side and from a fourth side to the second side of the board body. The waved sections define multiple raised sections and recessed sections on two faces of the board body. The heat exchanger is composed of multiple board bodies arranged adjacent to and in parallel to each other. Each two adjacent board bodies define therebetween a flow way. The inclined waved sections enhance turbulence intensity and guide the fluids to produce secondary flows along the cross-sections of the flow ways to form dynamic three-dimensional swirling flow structures which combine to augment heat transfer rates with reduced pressure-drop.

Abstract: A method for implementing file sharing in an audio and video conference includes: receiving a message sent by a file sharing initiator in the audio and video conference for requesting to create a file sharing data conference; creating the data conference for the initiator, and adding the initiator into the data conference; and carrying Session Description Protocol (SDP) information of a monitoring port distributed to the data conference in a response message, and sending the message to the initiator. A device and system for implementing file sharing in an audio and video conference are also provided.

Abstract: An inclined waved board and a heat exchanger thereof. The inclined waved board includes a board body composed of continuous waved sections. The waved sections are respectively inclined from a first side to a second side, inclined from the first side to a third side and inclined from a fourth side to the second side of the board body by an inclination. The waved sections define multiple raised sections and recessed sections on two faces of the board body. The heat exchanger is composed of multiple board bodies arranged adjacent to and in parallel to each other. Each two adjacent board bodies define therebetween a flow way. When fluids flow through the flow ways, the inclined waved sections enhance turbulence intensity and guide the fluids to produce secondary flows along the cross-sections of the flow ways so as to form dynamic three-dimensional swirling flow structure in the waved flow ways.

Abstract: A method for setting up an audio conference connection disclosed in an embodiment of the present invention includes: allocating at least two Media Servers (MSs), with the quantity of the MS dependent on the quantity of User Equipment (UE) involved in audio conference; selecting an MS as a root node MS, and treating the remaining MSs as leaf node MSs; allocating the UEs to the MSs, and setting up a connection between each UE and the MS that serves the UE; and setting up a connection between each leaf node MS and the root node MS. The present invention also discloses an apparatus for setting up an audio conference connection. The present invention enables concatenation of multiple MSs if a single MS is not enough for meeting the conference requirements, so as to implement a large conference with unlimited quantity of UE.