42results about How to "Realize dynamic protection" patented technology

The invention discloses a method for protecting a trial witness picture. The method comprises the following steps of taking a witness room picture before a witness enters a witness room as a reference frame, taking a witness room picture after the witness enters the witness room as a current frame, and executing an encoding process; calculating the sum of brightness absolute differences between macro blocks corresponding to the reference frame and the current frame; determining a witness rectangular region in the current frame according to a macro block whose sum of brightness absolute differences is greater than or equal to a threshold, and setting the witness rectangular region as a region of interest in the current frame; setting an H.264 coding quantization parameter of the region of interest in the current frame to be larger than H.264 coding quantization parameters of other regions except the region of interest in the current frame; performing H.264 encoding on the current frame and then sending out the current frame; and taking the current frame as the reference frame, taking the next frame of the current as the current frame, and repeating the encoding process circularly. The invention further discloses a trial witness picture protection device and system, and a video motion picture protection method and device. The method, the device and the system for protecting the trial witness picture and the video motion picture provided by the invention can realize the dynamic protection of the witness picture in motion, and ensure real-time and fast trial live streaming.

The invention relates to the technical field of waterproof construction, in particular to waterproof technologies of underground engineering such as subways, underground pipelines, tunnels, underground pipe corridors, underground garages and underground air defense facilities, and discloses a full surrounding skin-type structure of underground waterproof engineering and a construction method. The full surrounding skin-type structure of the underground waterproof engineering comprises a bottom layer, a top layer and a side face layer; the bottom layer, the top layer and the side face layer are surrounded to be whole and form a hollow structure; water-soluble non-curing coating layers and thin film reinforcing layers are arranged on the bottom layer, the top layer and the side face layer correspondingly; and the bottom water-soluble non-curing coating layer, the side face water-soluble non-curing coating layer and the top water-soluble non-curing coating layer form the integrated seamless connection full surrounding structure. According to the full surrounding skin-type structure of the underground waterproof engineering and the construction method, the defects that in the prior art, as for the underground waterproof engineering, whole failure or leakage in local joints are easy to occur are overcome.

The invention discloses a dynamic management method and device of a security mechanism. The method includes the steps of extracting subject attributes and object attributes of an access data stream; according to a preset ternary relationship and the subject attributes and object attributes of the access data stream, determining security mechanism components required by the access data stream, wherein the ternary relationship is a relationship among the subject attributes, the object attributes and security mechanism attributes; recombining the determined security mechanism components to generate a security protection system. In this way, the dynamic protection of internet services is achieved, accordingly the internet services and the security protection mechanism of an internet-based information system are more targeted, and the security protection capability of the internet services or the internet-based information system is also improved.

The invention discloses a tube-shell type heat exchange device and aims to provide a heat exchange device which can effectively achieve heat exchange between two types of liquid, has temperature difference compensation capacity and can be prevented from being damaged due to over-large temperature difference stress between a shell and a heat exchange tube. The tube-shell type heat exchange device comprises a tube pass part, a shell pass part and a plurality of brackets, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes; the shell pass part comprises an outer heat exchanger shell, a shell pass inlet tube and a shell pass outlet tube; the outer heat exchanger shell consists of a sealing head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a sealing head tube plate is arranged between the sealing head and the tube box; a tube pass flow partition plate partitions the interior of the shell head into a tube pass inflow cavity and a tube pass outflow cavity; an expansion joint is arranged on the tube box. The tube-shell type heat exchange device has the beneficial effects that according to the characteristic hat the expansion joint is relatively easy to deform, by the cooperation of the slidable sealing head tube plate, the structural temperature difference compensation effect can be achieved, and the structural damage caused by over-large temperature difference stress is avoided.

The invention discloses a chemical engineering heat exchanger and aims to provide a heat exchanger which can effectively realize heat exchange between two liquors, has capability of temperature difference compensation and can be prevented from being damaged due to excessively large temperature difference stress between a shell and heat exchange tubes. The chemical engineering heat exchanger comprises a tube pass part, a shell pass part and a plurality of brackets, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and the plurality of heat exchange tubes; the shell pass part comprises a heat exchanger shell body, a shell pass inlet tube and a shell pass outlet tube; the heat exchanger shell body comprises a seal head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a seal head tube plate is arranged between the seal head and the tube box; a tube pass flow baffle is used for dividing the interior of the shell head into a tube pass inflow cavity and a tube pass outflow cavity; an expansion joint is arranged on the tube box. The chemical engineering heat exchanger has the benefits that a structural temperature difference compensation effect can be achieved in combination with the slidable seal head tube plate based on a characteristic of easiness for deformation at the expansion joint, and structural damage caused by excessively large temperature difference stress is avoided.

The invention discloses a double-pass double-liquid heat exchange device and aims to provide a heat exchange device which can effectively realize heat exchange between two liquid, has the temperature difference compensation capacity and can prevent a shell and heat exchange tubes from being damaged caused by overlarge temperature difference stress between the shell and the heat exchange tubes. The double-pass double-liquid heat exchange device comprises a tube pass part, a shell pass part and a plurality of support frames, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes; the shell pass part comprises a heat exchanger shell, a shell pass inlet tube and a shell pass outlet tube; the heat exchanger shell consists of a sealing head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a sealing head tube plate is arranged between the sealing head and the tube box; the inner part of the shell head is divided into a tube pass flow inlet cavity and a tube pass flow outlet cavity through a tube pass flow isolation plate; an expansion joint is arranged on the tube box. The double-pass double-liquid heat exchange device has the benefits that through the characteristic that the deformation of the expansion joint is relatively easy and in cooperation with the slideable sealing head tube plate, a structural temperature difference compensation function can be realized, and the structure damage caused by overlarge temperature difference stress is avoided.

The invention discloses a tube-and-shell heat exchanger and aims to provide a heat exchanger, allowing effective heat exchange between two liquids, having thermal difference compensating capacity and preventing damage caused by thermal difference stress between a shell and heat exchange tubes. The tube-and-shell heat exchanger comprises a tube side portion, a shell side portion and a plurality of supports; the tube side portion comprises a tube side incoming tube, a tube side outgoing tube and a plurality of heat exchange tubes; the shell side portion comprises a housing, a shell side incoming tube and a shell side outgoing tube; the housing is composed of a seal head, a shell head and a tube box; a fixing tube plate is disposed between the shell head and the tube box; a seal head tube plate is disposed between the seal head and the tube box; a tube side partition plate divides the inside of the shell head into a tube side inflow cavity and a tube side outflow cavity; the tube box is provided with an expansion joint. The tube-and-shell heat exchanger has the advantages that the expansion joint featuring ease of deformation and the seal head tube plate slidable fit to function in structural thermal difference compensation, and structural damage caused by excessively high thermal temperature stress is avoided.