Abstract: In certain embodiments, a system includes a physical computing device having a tangible machine-readable medium including code. The code is adapted to determine an efficiency of a section of a steam turbine based on a relationship between enthalpy difference values and leakage flow rate values between adjacent sections of the steam turbine. The relationship includes a point of equalizing an enthalpy of the leakage and an enthalpy at a destination of the leakage.

Abstract: In certain embodiments, a system includes a physical computing device having a tangible machine-readable medium including code. The code is adapted to determine an efficiency of a section of a steam turbine based on a relationship between enthalpy difference values and leakage flow rate values between adjacent sections of the steam turbine. The relationship includes a point of equalizing an enthalpy of the leakage and an enthalpy at a destination of the leakage.

Abstract: Methods and apparatuses to present audio advertisements and deliver communication leads. One embodiment includes: providing an advertisement, on behalf of a party, to a customer over a real time communication channel that is capable of audio transmission; connecting the customer to the party according to a response to the advertisement; and charging for the advertisement according to a count of communication leads connected to the party.

Abstract: Methods and apparatuses to provide access to advertisement database through an application programming interface. One embodiment includes receiving a request according to an application program interface over a network connection; and in response to the request, providing at least a portion of an advertisement according to the application programming interface. The advertisement is designed to generate communication leads for a party; and the party is to be charged for the advertisement according to a count of communication leads generated for the party via the advertisement.

Abstract: Methods and apparatuses to track keywords used for matching advertisements that provide references to make calls for real time communications. One embodiment includes: selecting an advertisement based on a condition; providing a reference for presentation with the advertisement, to identify the condition and the advertisement; and charging an advertisement fee in response to a call via the reference for a real time communication session.

Abstract: Methods and apparatuses to provide access to manage advertisements which provide references usable to request real time communication connections. One embodiment includes receiving a request according to an application programming interface over a network connection; and providing access to manage an advertisement of an advertiser via the application programming interface in response to the request (e.g., to create, update, query, delete the advertisement, such as a pay per call advertisement). In one embodiment, the advertisement is to be embedded with a real time communication reference assigned to the advertiser; the real-time communication reference is to be used to request a real time communication connection with the advertiser; and the advertiser is to be charged for communication leads generated via the real-time communication reference embedded in the advertisement.

Abstract: Systems and methods to facilitate the management of multiple pay for performance advertisements. In one embodiment, a method includes: generating a user interface to show a plurality of advertisements simultaneously and to allow editing of any of the plurality of advertisements; and updating an advertisement database according to input received in the user interface. In one embodiment, the each advertisement of the plurality of advertisements is charged for according to a price bid in response to a communication lead generated from the advertisement. In one embodiment, the plurality of advertisements are selected from advertisements of more than one user.

Abstract: Methods and apparatuses to present advertisements which provide references to request real time communication connections. One embodiment includes presenting an advertisement including information usable to request a real time communication connection to a predetermined advertiser, which is to be charged a fee for the advertisement responsive to the real time communication connection established to the advertiser using the information.

Abstract: A method for measuring efficiency of a turbine includes operating the power plant at a first load, wherein a gas turbine is operated with a first fuel flow and a first gas turbine inlet air flow, determining a first shaft output at the first load with steam supplied from a heat recovery steam generator (HRSG) to both the first steam turbine inlet and the second steam turbine inlet, maintaining the first gas turbine fuel flow, the first gas turbine inlet air flow, and the first steam turbine inlet steam flow while isolating the second steam turbine from the steam admission flow, determining a second shaft output while the second steam turbine is isolated from the steam admission flow, and determining an expansion efficiency of the second steam turbine based on the first shaft output and the second shaft output and a measured change in second steam turbine admission steam flow.

Abstract: A method for measuring efficiency of a turbine includes operating the power plant at a first load, wherein a gas turbine is operated with a first fuel flow and a first gas turbine inlet air flow, determining a first shaft output at the first load with steam supplied from a heat recovery steam generator (HRSG) to both the first steam turbine inlet and the second steam turbine inlet, maintaining the first gas turbine fuel flow, the first gas turbine inlet air flow, and the first steam turbine inlet steam flow while isolating the second steam turbine from the steam admission flow, determining a second shaft output while the second steam turbine is isolated from the steam admission flow, and determining an expansion efficiency of the second steam turbine based on the first shaft output and the second shaft output and a measured change in second steam turbine admission steam flow.