Abstract: In the automatic welding method and device for prestressed tubular piles provided in the present application, which is applied in welding equipment, a detection is conducted around a connection position between prestressed tubular piles and a position of a target welding seam is obtained. Then the target welding seam is welded around the prestressed tubular piles according to the position of the target welding seam.

Abstract: In the automatic welding method and device for prestressed tubular piles provided in the present application, which is applied in welding equipment, a detection is conducted around a connection position between prestressed tubular piles and a position of a target welding seam is obtained. Then the target welding seam is welded around the prestressed tubular piles according to the position of the target welding seam.

Abstract: A method and apparatus provide access to communication services using dynamically assigned user credentials. The method includes establishing a communication connection with a first communication network (such as GSM, UMTS, CDMA, or LTE networks) using a real user credential (e.g., a SIM, a USIM, or an R-UIM card or certificates) in a first communication module, utilizing the first communication connection to request the dynamically assigned user credential from a remote management system, and registering a second communication module into the second communication network. The second communication connection is then tethered to allow other devices to access the Internet or other network.

Abstract: An interworking solution only requires that Greenfield LTE deploy the IWF and IMS AS, and set up the connections between their MME and IWF for the IMSI attach procedure. The solution uses an IMS client that can be installed on the roamer's devices. Thus once the roamer is attached to the LTE network together with IMSI attach via IWF function, and registered into the IMS system, the roamer can receive voice call and SMS by the original phone number, even though the LTE operator network does not support CSFB.

Abstract: A method and apparatus provide access to communication services using dynamically assigned user credentials. The method includes establishing a communication connection with a first communication network (such as GSM, UMTS, CDMA, or LTE networks) using a real user credential (e.g., a SIM, a USIM, or an R-UIM card or certificates) in a first communication module, utilizing the first communication connection to request the dynamically assigned user credential from a remote management system, and registering a second communication module into the second communication network. The second communication connection is then tethered to allow other devices to access the Internet or other network.

Abstract: A method and apparatus provide access to communication services using dynamically assigned user credentials. The method includes establishing a communication connection with a first communication network (such as GSM, UMTS, CDMA, or LTE networks) using a real user credential (e.g., a SIM, a USIM, or an R-UIM card or certificates) in a first communication module, utilizing the first communication connection to request the dynamically assigned user credential from a remote management system, and registering a second communication module into the second communication network. The second communication connection is then tethered to allow other devices to access the Internet or other network.

Abstract: A method and apparatus provide access to communication services using dynamically assigned user credentials. The method includes establishing a communication connection with a first communication network (such as GSM, UMTS, CDMA, or LTE networks) using a real user credential (e.g., a SIM, a USIM, or an R-UIM card or certificates) in a first communication module, utilizing the first communication connection to request the dynamically assigned user credential from a remote management system, and registering a second communication module into the second communication network. The second communication connection is then tethered to allow other devices to access the Internet or other network.

Abstract: A method and apparatus provide access to communication services using dynamically assigned user credentials. The method includes establishing a communication connection with a first communication network (such as GSM, UMTS, CDMA, or LTE networks) using a real user credential (e.g., a SIM, a USIM, or an R-UIM card or certificates) in a first communication module, utilizing the first communication connection to request the dynamically assigned user credential from a remote management system, and registering a second communication module into the second communication network. The second communication connection is then tethered to allow other devices to access the Internet or other network.

Abstract: An improvement to raise the efficiency of a reciprocating refrigeration compressor, the improvement comprising a channel in the piston that transfers pressure from the clearance volume of the cylinder to the low pressure side of the piston when an opening of the channel aligns with a groove or a duct in the cylinder wall. The channel comprises a ball extending from and held to the clearance volume opening of the channel by a spring. When the spring is compressed, the ball is moved from the opening, and pressure in the clearance volume is transferred to the low pressure side of the piston.

Abstract: An improvement to raise the efficiency of a reciprocating air compressor, the improvement comprising a channel in the piston that transfers pressure from the clearance volume of the cylinder to the low pressure side of the piston when an opening of the channel aligns with a groove in the cylinder wall. Alternately, the channel comprises a ball extending from and held to the clearance volume opening of the channel by a spring. When the spring is compressed, the ball is moved from the opening, and pressure in the clearance volume is transferred to the low pressure side of the piston. The improvement dramatically raises the efficiency of a reciprocating air compressor.

Abstract: An improvement to raise the efficiency of a reciprocating refrigeration compressor, the improvement comprising a channel in the piston that transfers pressure from the clearance volume of the cylinder to the low pressure side of the piston when an opening of the channel aligns with a groove or a duct in the cylinder wall. Alternately, the channel comprises a ball extending from and held to the clearance volume opening of the channel by a spring. When the spring is compressed, the ball is moved from the opening, and pressure in the clearance volume is transferred to the low pressure side of the piston.