Abstract: Methods, apparatus, systems and articles of manufacture for automatic database failover in a master-replica replication configuration are disclosed. An example node within a database system having a plurality of nodes, includes an agent to select a first database operated at one of the plurality of nodes to function as a master database in a master-replica replication configuration. The agent is to cause the selected database to be configured as the master database. The agent is to configure a first reverse proxy of the node. The first reverse proxy is to receive a query from a load balancer and forward the query to the master database based on the configuration.

Abstract: Methods and apparatus to propagate an update between nodes in a distributed environment are disclosed. An example apparatus includes a first virtual appliance configured to install an update using an update file from a first update repository, the first update repository located apart from the first virtual appliance, the first virtual appliance configured to form a second update repository at the first virtual appliance, the second update repository to include a copy of the update file from the first update repository. The example apparatus also includes a second virtual appliance, the second virtual appliance formed as a replica of the first virtual appliance, the second virtual appliance to install the update using the copy of the update file from the second update repository.

Abstract: Methods, apparatus, systems and articles of manufacture for automatic database failover in a master-replica replication configuration are disclosed. An example node within a database system having a plurality of nodes, includes an agent to select a first database operated at one of the plurality of nodes to function as a master database in a master-replica replication configuration. The agent is to cause the selected database to be configured as the master database. The agent is to configure a first reverse proxy of the node. The first reverse proxy is to receive a query from a load balancer and forward the query to the master database based on the configuration.

Abstract: Methods and apparatus to propagate an update between nodes in a distributed environment are disclosed. An example apparatus includes a first virtual appliance configured to install an update using an update file from a first update repository, the first update repository located apart from the first virtual appliance, the first virtual appliance configured to form a second update repository at the first virtual appliance, the second update repository to include a copy of the update file from the first update repository. The example apparatus also includes a second virtual appliance, the second virtual appliance formed as a replica of the first virtual appliance, the second virtual appliance to install the update using the copy of the update file from the second update repository.

Abstract: An apparatus for ablating living tissue. In one embodiment, the apparatus includes a first Sr vapor laser for generating a first laser beam, a second Sr vapor laser for receiving and amplifying the first laser beam, and a spatial filter optically positioned between and coupled to the first Sr vapor laser and the second Sr vapor laser for allowing selected fractions of the first laser beam to be received and amplified by the second Sr vapor laser so as to generate a second laser beam with sufficient strength and beam quality in a single pulse for ablating living tissue.

Abstract: A Stator-Rotor piston internal combustion engine (50) is diclosed having two identical stator halves (5) with an equal number of cylinders in each of them, a flat rotor (6) with two internal gear rings (12) fitted on its periphery and two auxiliary gears (13) sliding on its hubs (14), the rotor (6) being fixed on the engine shaft (7) between both stator halves. Each cylinder is provided with own crankshaft (10) and a drive gear (11) mounted thereon. All drive gears (11) are engaged with the rotor internal gear rings (12) and the auxiliary gears (13) for transmitting the explosion power to the engine shaft (7). As a result of the transmission ratio between the drive gears (11) and the internal gear rings (12) the engine revolutions are reduced in comparison with those of the single crankshafts. For smooth running characteristics of the engine two opposite cylinders explode simultaneously, one of each stator half, and the firing order runs in a circle: 1+3A, 2+4A, 3+1A, 4+2A.