Abstract: Disclosed is a three layer process for making contact points to a high transition temperature superconductor (HTSC), particularly to (Bi,Pb)2 Sr2 Ca2 CU3019+x with and without silver in the superconductor. The contact structure is a three layer configuration with a perforated silver foil (3) sandwiched between two metal spray gun deposited silver layers (2,5) and subsequent heat treatment in air. The contact has been made on tubes and rods (1). The silver contacts are capable of carrying a continuous current of 200 Amps without adding any substantial heat load to the cryogen used to cool the HTSC. The contact resistance at 4.2 K is in the range of 1.5×10 (hoch?8) to 8.5? 10 (hoch?8) OHM in zero applied filed.

Abstract: Disclosed is a three layer process for making contact points to a high transition temperature superconductor (HTSC), particularly to (Bi,Pb)2 Sr2 Ca2 CU3019+x with and without silver in the superconductor. The contact structure is a three layer configuration with a perforated silver foil (3) sandwiched between two metal spray gun deposited silver layers (2,5) and subsequent heat treatment in air. The contact has been made on tubes and rods (1). The silver contacts are capable of carrying a continuous current of 200 Amps without adding any substantial heat load to the cryogen used to cool the HTSC. The contact resistance at 4.2K is in the range of 1.5×10(hoch?8) to 8.5? 10(hoch?8)OHM in zero applied filed.

Abstract: Disclosed is a three layer process for making contact points to a high transition temperature superconductor (HTSC), particularly to (Bi,Pb)2Sr2Ca2Cu3O19+x with and without silver in the superconductor. The contact structure is a three layer configuration with a perforated silver foil (3) sandwiched between two metal spray gun deposited silver layers (2,5) and subsequent heat treatment in air. The contact has been made on tubes and rods (1). The silver contacts are capable of carrying a continuous current of 200 Amps without adding any substantial heat load to the cryogen used to cool the HTSC. The contact resistance at 4.2 K is in the range of 1.5×10 (hoch?8) to 8.5? 10 (hoch?8)OHM in zero applied filed.

Abstract: The present invention provides a process for the preparation of high temperature superconducting (HTS) bulk current leads capable of supplying a continuous current of more than 200 A at 77 K, at least for 2 to 4 hours without any substantial heat load to cryogen free cryocooler and other superconducting magnet systems. The superconducting bulk current leads with improved properties are prepared from an improved high temperature superconducting (HTS) bismuth based cuperate [(Bi, Pb)2Sr2Ca2Cu3O10+x] material in tube and rod shape with both end metallic contacts.

Abstract: The present invention provides a process for joining oxide-superconducting tubes with a superconducting joint. The process involves the preparation of a partially preformed superconducting material, followed by cold isopressing of the powder of partially performed superconducting material into tube shape and further provided with grooves at both ends of the tubes with a subsequent deposition of a silver layer. The process further involves the lapping of one of the end faces of a pair of said tubes to be joined. These lapped end faces of both the tubes clubbed together on a common silver bush are coated with a paste of the same partially preformed superconducting material in organic formulation. Then these coated end faces are closed pressed together to form a joint. This joint portion and the end portions of the tubes are wrapped with a perforated silver foil followed by deposition of another layer of silver.

Abstract: An improved process for the preparation of oxide superconducting rods. The present invention provides a process for the preparation of oxide superconducting rods. The process includes the steps of a cold isopressing process without addition of binder, particularly thin and those based on Ag-added (Bi,Pb)2 Sr2 Ca2 Cu3 O10+x is disclosed.

Abstract: Disclosed is a three layer process for making contact points to a high transition temperature superconductor (HTSC), particularly to (Bi,Pb)2 Sr2Ca2 Cu3O19+1 with and without silver in the superconductor. The contact structure is a three layer configuration with a perforated silver foil (3) sandwiched between two metal spray gun deposited silver layers (2,5) and subsequent heat treatment in air. The contact has been made on tubes and rods (1). The silver contacts are capable of carrying a continuous current of 200 Amps without adding any substantial heat load to the cryogen used to cool the HTSC. The contact resistance at 4.2 K is in the range of 1.5×10 (hoch?8) to 8.5? 10 (hoch?8)OHM in zero applied filed.

Abstract: The present invention provides a process for the preparation of high temperature superconducting (HTS) bulk current leads capable of supplying a continuous current of more than 200 A at 77K, at least for 2 to 4 hours without any substantial heat load to cryogen free cryocooler and other superconducting magnet systems. The superconducting bulk current leads with improved properties are prepared from an improved high temperature superconducting (HTS) bismuth based cuperate [(Bi, Pb)2 Sr2Ca2Cu3O10+x] material in tube and rod shape with both end metallic contacts.

Abstract: The invention is a fault isolation method and apparatus for use in a network access server. The method includes allocating one or more modems in a group of modems associated with an access server to a debug modem pool; allocating one or more remaining modems in the group to a session modem pool; thereafter determining whether an incoming call to the access server meets predefined fault isolation criteria; and, if so, then allocating a debug modem from the debug modem pool to the incoming call and initiating a fault isolation session; and if not, then allocating a session modem from the session modem pool to the incoming call and proceeding with a normal session. Preferably, the defined criteria include at least one match between one or more user attributes associated with the incoming call and one or more corresponding fault isolation session attributes stored within the network access server. The criteria themselves may be configurable, e.g. definable by the user.

Abstract: The invention is a fault isolation method and apparatus for use in a network access server. The method includes allocating one or more modems in a group of modems associated with an access server to a debug modem pool; allocating one or more remaining modems in the group to a session modem pool; thereafter determining whether an incoming call to the access server meets predefined fault isolation criteria; and, if so, then allocating a debug modem from the debug modem pool to the incoming call and initiating a fault isolation session; and if not, then allocating a session modem from the session modem pool to the incoming call and proceeding with a normal session. Preferably, the defined criteria include at least one match between one or more user attributes associated with the incoming call and one or more corresponding fault isolation session attributes stored within the network access server. The criteria themselves may be configurable, e.g. definable by the user.