The Experts below are selected from a list of 9906 Experts worldwide ranked by ideXlab platform

Chuck Kutscher - One of the best experts on this subject based on the ideXlab platform.

  • Small-Scale Geothermal Power Plant Field Verification Projects: Preprint
    2001
    Co-Authors: Chuck Kutscher
    Abstract:

    In the spring of 2000, the National Renewable Energy Laboratory issued a request for proposal for the construction of small-scale (300 kilowatt [kW] to 1 megawatt [MW]) geothermal power plants in the western United States. Five projects were selected for funding. Of these five, subcontracts have been completed for three, and preliminary design work is being conducted. The three projects currently under contract represent a variety of concepts and locations: a 1-MW evaporatively enhanced, air-cooled binary-cycle plant in Nevada; a 1-MW water-cooled Kalina-cycle plant in New Mexico; and a 750-kW low-temperature flash plant in Utah. All three also incorporate direct heating: onion dehydration, heating for a fish hatchery, and greenhouse heating, respectively. These projects are expected to begin operation between April 2002 and September 2003. In each case, detailed data on performance and costs will be taken over a 3-year period.

  • Small-Scale Geothermal Power Plant Field Verification Projects
    TRANSACTIONSGEOTHERMAL RESOURCES, 2001
    Co-Authors: Chuck Kutscher
    Abstract:

    In the spring of 2000, the National Renewable Energy Laboratory issued a request for proposal for the construction of small-scale (300 kilowatt [kW] to 1 megawatt [MW]) geothermal power plants in the western United States. Five projects were selected for funding. Of these five, subcontracts have been completed for three, and preliminary design work is being conducted. The three projects currently under contract represent a variety of concepts and locations: a 1-MW evaporatively enhanced, air-cooled binary-cycle plant in Nevada; a 1-MW water-cooled Kalina-cycle plant in New Mexico; and a 750-kW low-temperature flash plant in Utah. All three also incorporate direct heating: onion dehydration, heating for a fish hatchery, and greenhouse heating, respectively. These projects are expected to begin operation between April 2002 and September 2003. In each case, detailed data on performance and costs will be taken over a 3-year period.

Steven Willmott - One of the best experts on this subject based on the ideXlab platform.

  • exploring social networks in request for proposal dynamic coalition formation problems
    CEEMAS '07 Proceedings of the 5th international Central and Eastern European conference on Multi-Agent Systems and Applications V, 2007
    Co-Authors: Carlos Meridacampos, Steven Willmott
    Abstract:

    In small scale multi-agent environments, every agent is aware of all of the others. This allows agents to evaluate the potential outcomes of their interaction for each of their possible interaction partners. However, this farsighted knowledge becomes an issue in large scale systems, leading to a combinatorial explosion in evaluation and is unrealistic in communication terms. Limited awareness of other agents is therefore the only plausible scenario in many large-scale environments. This limited awareness can be modeled as a sparse social network in which agents only interact with a limited subset of agents known to them. In this paper, we explore a model of dynamic multi-agent coalition formation in which agents are connected via fixed underlying social networks that exhibit different well known structures such as Small World, Randomand Scale Freetopologies. Agents follow different exploratory policies and are distributed in the network according to a variety of metrics. The primary results of the paper are to demonstrate different positive and negative properties of each topology for the coalition formation problem. In particular we show that despite positive properties for many problems, Small Worldtopologies introduce blocking factors which hinder the emergence of good coalition solutions in many configurations.

  • the impact of betweenness in small world networks on request for proposal coalition formation problems
    Conference on Artificial Intelligence Research and Development, 2007
    Co-Authors: Carlos Meridacampos, Steven Willmott
    Abstract:

    The analysis of societies demonstrates the recurrent nature of small world topology in the interactions of elements in such worlds. The small world topology proves to have beneficial properties for system's performance in many cases, however there are also scenarios where the small world topology's properties negatively affect the system's outcome; thus in depth knowledge on the small world weaknesses is needed in order to develop new generations of artificial societies and new models of economic systems. In this paper, a multi-agent system based on request for proposal protocol and coalition formation organisational paradigm is used to analyse properties of small world social networks of agents. Experiments center on nodes in the network with high betweenness and in particular the distribution of agents in the population across these nodes. Results show that small world topology scenarios lose their beneficial properties when non-competitive agents are positioned as high betweeness nodes in the network.

  • CCIA - The impact of betweenness in small world networks on request for proposal coalition formation problems
    2007
    Co-Authors: Carlos Merida-campos, Steven Willmott
    Abstract:

    The analysis of societies demonstrates the recurrent nature of small world topology in the interactions of elements in such worlds. The small world topology proves to have beneficial properties for system's performance in many cases, however there are also scenarios where the small world topology's properties negatively affect the system's outcome; thus in depth knowledge on the small world weaknesses is needed in order to develop new generations of artificial societies and new models of economic systems. In this paper, a multi-agent system based on request for proposal protocol and coalition formation organisational paradigm is used to analyse properties of small world social networks of agents. Experiments center on nodes in the network with high betweenness and in particular the distribution of agents in the population across these nodes. Results show that small world topology scenarios lose their beneficial properties when non-competitive agents are positioned as high betweeness nodes in the network.

  • the effect of heterogeneity on coalition formation in iterated request for proposal scenarios
    European Workshop on Multi-Agent Systems, 2006
    Co-Authors: Carlos Meridacampos, Steven Willmott
    Abstract:

    This paper explores a general model of economic exchange between heterogeneous agents representing firms, traders, or other socioeconomic entities, that self-organise into coalitions to face specific tasks. In particular, the work addresses coalition formation problems in which many tasks are addressed to the same population over time in an iterative fashion – giving the agents the possibility to organise themselves for specific tasks. In particular, the purpose of the paper is to describe the impact of task and skill heterogeneity in the population on the performance of the agents. Experiments are carried out for two common strategies from the economic world, namely competitive and conservative strategies. Results obtained show that competitive population outperforms conservative population, and that the heterogeneity degree has a direct effect on the advantage of the first strategy versus the second. We analyse experimental results by using a novel data mining technique called collaboration graphs.

Carlos Meridacampos - One of the best experts on this subject based on the ideXlab platform.

  • exploring social networks in request for proposal dynamic coalition formation problems
    CEEMAS '07 Proceedings of the 5th international Central and Eastern European conference on Multi-Agent Systems and Applications V, 2007
    Co-Authors: Carlos Meridacampos, Steven Willmott
    Abstract:

    In small scale multi-agent environments, every agent is aware of all of the others. This allows agents to evaluate the potential outcomes of their interaction for each of their possible interaction partners. However, this farsighted knowledge becomes an issue in large scale systems, leading to a combinatorial explosion in evaluation and is unrealistic in communication terms. Limited awareness of other agents is therefore the only plausible scenario in many large-scale environments. This limited awareness can be modeled as a sparse social network in which agents only interact with a limited subset of agents known to them. In this paper, we explore a model of dynamic multi-agent coalition formation in which agents are connected via fixed underlying social networks that exhibit different well known structures such as Small World, Randomand Scale Freetopologies. Agents follow different exploratory policies and are distributed in the network according to a variety of metrics. The primary results of the paper are to demonstrate different positive and negative properties of each topology for the coalition formation problem. In particular we show that despite positive properties for many problems, Small Worldtopologies introduce blocking factors which hinder the emergence of good coalition solutions in many configurations.

  • the impact of betweenness in small world networks on request for proposal coalition formation problems
    Conference on Artificial Intelligence Research and Development, 2007
    Co-Authors: Carlos Meridacampos, Steven Willmott
    Abstract:

    The analysis of societies demonstrates the recurrent nature of small world topology in the interactions of elements in such worlds. The small world topology proves to have beneficial properties for system's performance in many cases, however there are also scenarios where the small world topology's properties negatively affect the system's outcome; thus in depth knowledge on the small world weaknesses is needed in order to develop new generations of artificial societies and new models of economic systems. In this paper, a multi-agent system based on request for proposal protocol and coalition formation organisational paradigm is used to analyse properties of small world social networks of agents. Experiments center on nodes in the network with high betweenness and in particular the distribution of agents in the population across these nodes. Results show that small world topology scenarios lose their beneficial properties when non-competitive agents are positioned as high betweeness nodes in the network.

  • the effect of heterogeneity on coalition formation in iterated request for proposal scenarios
    European Workshop on Multi-Agent Systems, 2006
    Co-Authors: Carlos Meridacampos, Steven Willmott
    Abstract:

    This paper explores a general model of economic exchange between heterogeneous agents representing firms, traders, or other socioeconomic entities, that self-organise into coalitions to face specific tasks. In particular, the work addresses coalition formation problems in which many tasks are addressed to the same population over time in an iterative fashion – giving the agents the possibility to organise themselves for specific tasks. In particular, the purpose of the paper is to describe the impact of task and skill heterogeneity in the population on the performance of the agents. Experiments are carried out for two common strategies from the economic world, namely competitive and conservative strategies. Results obtained show that competitive population outperforms conservative population, and that the heterogeneity degree has a direct effect on the advantage of the first strategy versus the second. We analyse experimental results by using a novel data mining technique called collaboration graphs.

Christian Weik - One of the best experts on this subject based on the ideXlab platform.

K.d. Wiemers - One of the best experts on this subject based on the ideXlab platform.

  • Low-activity waste envelope definitions for the TWRS Privatization Phase I request for proposal
    1996
    Co-Authors: G.k. Patello, L. Lauerhass, R.l. Myers, K.d. Wiemers
    Abstract:

    Radioactive waste has been stored in large underground storage tanks at the Hanford Site since 1944. Approximately 212 million liters of waste containing approximately 240,000 metric tons of processed chemicals and 177 mega-curies of radionuclides are now stored in 177 tanks. These caustic wastes are in the form of liquids, slurries, saltcakes, and sludge. In 1991, the Tank Waste Remediation System (TWRS) Program was established to manage, retrieve, treat, immobilize, and dispose of these wastes in a safe, environmentally sound, and cost-effective manner. The Department of Energy (DOE) has believes that it is feasible to privatize portions of the TWRS Program. Under the privatization strategy embodied in the request for proposal (RFP), DOE will purchase services from a contractor-owned, contractor-operated facility under a fixed-price contract. Phase I of the TWRS privatization strategy is a proof-of-concept/commercial demonstration-scale effort. The objectives of Phase I are to demonstrate the technical and business viability of using privatized facilities to treat Hanford tank waste; define and maintain required levels of radiological, nuclear, process, and occupational safety; maintain environmental protection and compliance; and substantially reduce life-cycle costs and time required to treat Hanford tank waste. Three low-activity waste (LAW) envelopes are identified for Phase I of the privatization contract and are representative of the range of Hanford double-shelled tank (DST) waste.

  • TWRS Privatization Phase I waste characterization data evaluation for the request for proposal
    1996
    Co-Authors: G.k. Patello, K.d. Wiemers
    Abstract:

    Radioactive wastes have been stored in large underground tanks at Hanford since 1944. In 1991, The Tank Waste Remediation System (TWRS) program was established to manage, retrieve, treat, immobilize, and dispose of these wastes in a safe, effective manner. DOE believes that it is feasible to privatize portions of the TWRS program. Under the Privatization strategy embodied in the request for proposal, DOE will purchase services from a contractor-owned, contractor-operated facility under a fixed-price type of contract. Phase I is a proof-of- concept/commercial demonstration-scale effort. Method used to achieve the objective of producing a technically reviewed inventory is outlined. Organic speciation and physical properties were gathered for the tank wastes and may be found in the individual tank section of this document; reference reviews and tank volume and sampling summary graphs are also provided for each tank.