Abstract:
L'invention concerne un procédé de prévention ou de réduction considérable de la formation de dépôts calcaires sur une cathode conductrice d'électrons inerte dans une cellule primaire (1), basé sur la réaction entre l'oxygène, l'eau et une anode métallique, lors qu'elle est immergée dans de l'eau de mer et connectée à une charge (2). Le problème de la détérioration de la cellule (1) provoquée par les dépôts calcaires sur la cathode de la cellule, est résolu par le contrôle de la tension de la cellule et/ou de facteurs conduisant à des changements se produisant dans la tension de ladite cellule, réduisant ou déconnectant la charge (2) si la tension de la cellule chute au-dessous d'un certain niveau (VC), et reconnectant ladite charge (2) après un certain temps ou lorsque la tension s'élève au-dessus d'un second niveau donné (VB).
Abstract:
This invention relates to electrical power cables having crosslinked extruded insulation (4) and fully bonded extruded semiconductors in contact with the conductor (2) and with the outer screens (6) respectively. In order to provide smooth interfaces between the semiconductors and the insulation and prevent pre-crosslinked semiconductor clots from appearing at the inner (and outer) surface of the insulation layers, the semiconductors are extruded as a composite structure the inner parts (3b, 5b) of which are free from crosslinking agents.
Abstract:
This invention relates to a communication network intended for secure transmission of speech and data, including different types of subscriber terminals (1-4) and switching modules (7-8), where subscriber lines (23-26) connect each subscriber terminal with a switching module and transmission links (19-22) connect each switching module to other switching modules in the network, where transmission links and subscriber lines each carry one or more communication channels, and where the network further comprise crypto devices (13-15) to undertake encryption/decryption or other required protection mechanisms of information transmitted through the network, and where at least one of the crypto devices is constituted by a crypto-pool device having a number of crypto modules (35) which is physically separated from the switching modules (7,8), and which may communicate with the switching modules through standardized interface and communication protocols which makes the device accessible from subscriber terminals, from switching modules or from other network equipment. At least one of the crypto pool devices is a security guard (9 or 10) arranged at the interface between a switching module (7 or 8) and one of its transmission links (19 or 22) such that no impact on the switching module is required. The security guard (9 or 10) includes means stored and managed by a managing device (30) for specifying the criteria for whether a communication channel should be subjected to encryption/decryption or a data packet (message) on a virtual communication channel should be subjected to protection as required. The security guard (9 or 10) includes means stored and managed by the managing device (30) which during installation or a managing procedure are configured by a security manager (17) for monitoring control information on the signalling channel (38 or 39) to detect whether a particular communication channel is to be encrypted/decrypted or a data packet (message) is to be protected as required.
Abstract:
This invention relates to a method and means for interconnecting two insulated conductors in subsea environments. The interconnection is done by means of a subsea connector (1) including a conductor splice pin (6,7) and a splice insulation sleeve (8). A metal tube (9) is placed over the splice sleeve (8) and the conductor insulation (4,5) of both. The metal tube (9) is provided with partition means (12) for separating the two moldings (13,14).
Abstract:
This invention relates to a communication network intended for secure transmission of speech and data, including different types of subscriber terminals (10-15) and switching modules (4-6), and where the network further comprise crypto devices to undertake encryption/decryption of information transmitted through the network. At least one of the crypto devices is constituted by a crypto-pool device (7,8,9) having a number of crypto modules (CM) physically separated from the switching modules (4,5,6). Each crypto-pool (7,8,9; 20) is provided with a managing device (MA, 26) for communicating with a ciphering key distribution authority through standardized communication protocols and distribute keys to the relevant CM through a control path (25) of the crypto-pool. Each crypto-pool has access to an authentication server (AS, 16; 41,43) providing a directory of security certificates necessary in the authentication process when initiating a network connection.
Abstract:
This invention relates to a communication network intended for secure transmission of speech and data, including different types of subscriber terminals (10-15) and switching modules (4-6), and where the network further comprise crypto devices to undertake encryption/decryption of information transmitted through the network. At least one of the crypto devices is constituted by a crypto-pool device (7,8,9) having a number of crypto modules (CM) physically separated from the switching modules (4,5,6). Each crypto-pool (7,8,9; 20) is provided with a managing device (MA, 26) for communicating with a ciphering key distribution authority through standardized communication protocols and distribute keys to the relevant CM through a control path (25) of the crypto-pool. Each crypto-pool has access to an authentication server (AS, 16; 41,43) providing a directory of security certificates necessary in the authentication process when initiating a network connection.
Abstract:
This invention relates to electrical power cables having crosslinked extruded insulation (4) and fully bonded extruded semiconductors in contact with the conductor (2) and with the outer screens (6) respectively. In order to provide smooth interfaces between the semiconductors and the insulation and prevent pre-crosslinked semiconductor clots from appearing at the inner (and outer) surface of the insulation layers, the semiconductors are extruded as a composite structure the inner parts (3b, 5b) of which are free from crosslinking agents.