The Experts below are selected from a list of 276762 Experts worldwide ranked by ideXlab platform
Kristin Vala Ragnarsdottir - One of the best experts on this subject based on the ideXlab platform.
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Modelling Global Wolfram Mining, Secondary Extraction, Supply, Stocks-in-Society, Recycling, Market Price and Resources, Using the WORLD6 System Dynamics Model
BioPhysical Economics and Resource Quality, 2017Co-Authors: Harald Ulrik Sverdrup, Anna Hulda Olafsdottir, Kristin Vala RagnarsdottirAbstract:The extraction, Supply, Market price and recycling of the metal wolfram (W) were modelled using a wolfram submodule developed for the WORLD6 system dynamics model. The resource estimates made for wolfram resulted in significantly larger estimates than earlier studies (URR = 28 million ton in 2015, where at least 24 million ton is in primary ore and about 2 million ton is secondary resources). The model can well reconstruct the observed extraction rates and price histories. The model outputs demonstrate that wolfram is a finite resource and that there is a risk for Supply scarcity, unless the degree of recycling will be significantly improved from the present level. The model outputs suggest that there will be a soft scarcity around 2030 and hard scarcity after 2200. When pictured as Supply per person per year or stocks-in-use, there will be a Supply problem in the distant future. There are substitutes for some applications, but for some key uses there are none that are optimal. Without wolfram, several advanced technologies seen as important at the present time will become difficult to produce.
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A system dynamics model for platinum group metal Supply, Market price, depletion of extractable amounts, ore grade, recycling and stocks-in-use
Resources Conservation and Recycling, 2016Co-Authors: Harald Ulrik Sverdrup, Kristin Vala RagnarsdottirAbstract:The long term development of world primary extraction, Market Supply, recycling and extractable amounts of the platinum group metals platinum, palladium and rhodium was assessed. The degree of sustainability was estimated using system dynamics modelling. Compiling estimates from different sources, and considering recent technological advances in deep mining suggests that the Ultimately Recoverable Resource (URR) is about 216,000 ton of platinum group metals down to a mining depth of maximum 5 km, significantly more than earlier published estimates. The world Supply and production of platinum group metals was calculated using system dynamics methodology to develop the PGM-model for this study. The model combines mining, ore grade changes, trade Markets, price mechanisms, Supply, demand, estimates of stock-in-use, waste, dissipative losses and recycling into a whole world system. The model was run for the period of 1900–2400. The model outputs were successfully tested on historic data for mining rate, ore grades and platinum Market price during 1900–2014. The model indicates that extraction will reach maximum in the period 2020–2050 and that Market Supply will peak in 2070–2080. The delay is caused by the effect of recycling. The outputs from the model emphasize the importance of recycling, metal conservation and elimination of dissipative losses in order to secure long term sustainable platinum group metals Supply.
Harald Ulrik Sverdrup - One of the best experts on this subject based on the ideXlab platform.
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Modelling Global Wolfram Mining, Secondary Extraction, Supply, Stocks-in-Society, Recycling, Market Price and Resources, Using the WORLD6 System Dynamics Model
BioPhysical Economics and Resource Quality, 2017Co-Authors: Harald Ulrik Sverdrup, Anna Hulda Olafsdottir, Kristin Vala RagnarsdottirAbstract:The extraction, Supply, Market price and recycling of the metal wolfram (W) were modelled using a wolfram submodule developed for the WORLD6 system dynamics model. The resource estimates made for wolfram resulted in significantly larger estimates than earlier studies (URR = 28 million ton in 2015, where at least 24 million ton is in primary ore and about 2 million ton is secondary resources). The model can well reconstruct the observed extraction rates and price histories. The model outputs demonstrate that wolfram is a finite resource and that there is a risk for Supply scarcity, unless the degree of recycling will be significantly improved from the present level. The model outputs suggest that there will be a soft scarcity around 2030 and hard scarcity after 2200. When pictured as Supply per person per year or stocks-in-use, there will be a Supply problem in the distant future. There are substitutes for some applications, but for some key uses there are none that are optimal. Without wolfram, several advanced technologies seen as important at the present time will become difficult to produce.
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A system dynamics model for platinum group metal Supply, Market price, depletion of extractable amounts, ore grade, recycling and stocks-in-use
Resources Conservation and Recycling, 2016Co-Authors: Harald Ulrik Sverdrup, Kristin Vala RagnarsdottirAbstract:The long term development of world primary extraction, Market Supply, recycling and extractable amounts of the platinum group metals platinum, palladium and rhodium was assessed. The degree of sustainability was estimated using system dynamics modelling. Compiling estimates from different sources, and considering recent technological advances in deep mining suggests that the Ultimately Recoverable Resource (URR) is about 216,000 ton of platinum group metals down to a mining depth of maximum 5 km, significantly more than earlier published estimates. The world Supply and production of platinum group metals was calculated using system dynamics methodology to develop the PGM-model for this study. The model combines mining, ore grade changes, trade Markets, price mechanisms, Supply, demand, estimates of stock-in-use, waste, dissipative losses and recycling into a whole world system. The model was run for the period of 1900–2400. The model outputs were successfully tested on historic data for mining rate, ore grades and platinum Market price during 1900–2014. The model indicates that extraction will reach maximum in the period 2020–2050 and that Market Supply will peak in 2070–2080. The delay is caused by the effect of recycling. The outputs from the model emphasize the importance of recycling, metal conservation and elimination of dissipative losses in order to secure long term sustainable platinum group metals Supply.
Joseph Spear - One of the best experts on this subject based on the ideXlab platform.
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towards more effective sourcing and supplier management
European Journal of Purchasing & Supply Management, 1999Co-Authors: Robert E Spekman, John W Kamauff, Joseph SpearAbstract:While most acknowledge the cost savings associated with more efficient buying, lower purchase costs alone are not an adequate measure of world-class procurement management. To focus solely on cost savings, we believe, falls short of excellence in sourcing and supplier management. Firms that buy “smarter” achieve lower costs and leverage Supply Market opportunities to accomplish corporate goals. While the importance of cost savings is acknowledged, this paper argues that other “above the line” metrics deserve attention. This paper accomplishes two related goals. First, 10 principles that lead to effective sourcing and supplier management are presented and discussed. Second, a set of parallel data is used to add credibility to our normative presentation. The findings suggest that high performing Supply chains do, in fact, support the tenets of more effective sourcing and supplier management. Implications for managers are presented as well.
Katy Roelich - One of the best experts on this subject based on the ideXlab platform.
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Business model innovation in electricity Supply Markets: The role of complex value in the United Kingdom
Energy Policy, 2016Co-Authors: Stephen Hall, Katy RoelichAbstract:This research investigates the new opportunities that business model innovations are creating in electricity Supply Markets at the sub-national scale. These local Supply business models can offer significant benefits to the electricity system, but also generate economic, social, and environmental values that are not well accounted for in current policy or regulation. This paper uses the UK electricity Supply Market to investigate new business models which rely on more complex value propositions than the incumbent utility model. Nine archetypal local Supply business models are identified and their value propositions, value capture methods, and barriers to Market entry are analysed. This analysis defines 'complex value' as a key concept in understanding business model innovation in the energy sector. The process of complex value identification poses a challenge to energy researchers, commercial firms and policymakers in liberalised Markets; to investigate the opportunities for system efficiency and diverse outcomes that new supplier business models can offer to the electricity system.
Robert E Spekman - One of the best experts on this subject based on the ideXlab platform.
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towards more effective sourcing and supplier management
European Journal of Purchasing & Supply Management, 1999Co-Authors: Robert E Spekman, John W Kamauff, Joseph SpearAbstract:While most acknowledge the cost savings associated with more efficient buying, lower purchase costs alone are not an adequate measure of world-class procurement management. To focus solely on cost savings, we believe, falls short of excellence in sourcing and supplier management. Firms that buy “smarter” achieve lower costs and leverage Supply Market opportunities to accomplish corporate goals. While the importance of cost savings is acknowledged, this paper argues that other “above the line” metrics deserve attention. This paper accomplishes two related goals. First, 10 principles that lead to effective sourcing and supplier management are presented and discussed. Second, a set of parallel data is used to add credibility to our normative presentation. The findings suggest that high performing Supply chains do, in fact, support the tenets of more effective sourcing and supplier management. Implications for managers are presented as well.