| 1. |
- Holmberg, Pär, et al.
(författare)
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Nurses' encounters with children as next of kin to parents with a cancer diagnosis on oncology wards
- 2020
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Ingår i: Nordic journal of nursing research. - : Sage Publications. - 2057-1585 .- 2057-1593. ; 40:1, s. 33-40
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Tidskriftsartikel (refereegranskat)abstract
- It is a challenge for registered nurses (RNs) to meet children and young people who have a parent diagnosed with cancer. These children often suffer from shock, anxiety, outrage, fear and stress. Recent studies indicate that when next of kin have a professional person to talk to, their wellbeing increases. Moreover, when these children are involved in their parent’s care they also begin to trust the nurse caring for their parent. However, there is little known of how nurses respond to a child’s needs. Thus, aim of this study was to describe RNs’ experiences of encounters with children as next of kin to a parent diagnosed with cancer. A qualitative descriptive study based on semi-structured group interviews, with a latent content analysis was carried out. One theme, ‘sense of security’ including three categories ‘balanced meeting’, ‘de-dramatize healthcare’ and ‘learn from one another’ was identified. Beyond the categories, there are six sub-categories: ‘sense of insecurity’, ‘caring approach’, ‘providing information’, ‘participation’, ‘processing and follow-up’ and ‘increased knowledge’. The findings of this study highlight the importance of strengthening the RN's ability to create a caring relationship with children as next of kin.
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| 2. |
- Sarfati, Mahir, et al.
(författare)
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Simulation and Evaluation of Zonal Electricity Market Designs
- 2020
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Ingår i: Electric power systems research. - : Elsevier. - 0378-7796 .- 1873-2046. ; 185
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Tidskriftsartikel (refereegranskat)abstract
- Zonal pricing with countertrading (a market-based redispatch) gives arbitrage opportunities to the power producers located in the export-constrained nodes. They can increase their profit by increasing the output in the day-ahead market and decrease it in the real-time market (the inc-dec game). For a six-node and a 24-node system, we numerically show that this leads to large inefficiencies in a standard zonal market. We also show how the inefficiencies can be significantly mitigated for these two examples by changing the design of the real-time market. We consider a two-stage game with oligopoly producers, wind-power shocks and real-time shocks. The game is formulated as a two-stage stochastic Equilibrium Problem with Equilibrium Constraints (EPEC), which we recast into a two-stage stochastic Mixed-Integer Linear Constraints (MILC).
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| 3. |
- Sarfati, Mahir, et al.
(författare)
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Production efficiency of nodal and zonal pricing in imperfectly competitive electricity markets
- 2019
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Ingår i: Energy Strategy Reviews. - : ELSEVIER SCIENCE BV. - 2211-467X .- 2211-4688. ; 24, s. 193-206
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Tidskriftsartikel (refereegranskat)abstract
- Electricity markets employ different congestion management methods to handle the limited transmission capacity of the power system. This paper compares production efficiency and other aspects of nodal and zonal pricing. We consider two types of zonal pricing: zonal pricing with Available Transmission Capacity (ATC) and zonal pricing with Flow-Based Market Coupling (FBMC). We develop a mathematical model to study the imperfect competition under zonal pricing with FBMC. Zonal pricing with FBMC is employed in two stages, a dayahead market stage and a re-dispatch stage. We show that the optimality conditions and market clearing conditions can be reformulated as a mixed integer linear program (MILP), which is straightforward to implement. Zonal pricing with ATC and nodal pricing is used as our benchmarks. The imperfect competition under zonal pricing with ATC and nodal pricing are also formulated as MILP models. All MILP models are demonstrated on 6-node and the modified IEEE 24-node systems. Our numerical results show that the zonal pricing with ATC results in large production inefficiencies due to the inc-dec game. Improving the representation of the transmission network as in the zonal pricing with FBMC mitigates the inc-dec game.
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| 4. |
- Holmberg, Pär, et al.
(författare)
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Comparison of congestion management techniques: Nodal, zonal and discriminatory pricing
- 2015
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Ingår i: Energy Journal. - : International Association for Energy Economics. - 1944-9089 .- 0195-6574. ; 36:2, s. 145-166
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Tidskriftsartikel (refereegranskat)abstract
- Wholesale electricity markets use different market designs to handle congestion in the transmission network. We compare nodal, zonal and discriminatory pricing in general networks with transmission constraints and loop flows. We conclude that in large games with many producers and certain information, the three market designs result in the same efficient dispatch. However, zonal pricing with counter-trading results in additional payments to producers in export-constrained nodes, which leads to inefficient investments in the long-run.
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| 5. |
- Bermejo Gómez, Antonio, et al.
(författare)
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Transition metal-catalyzed redox isomerization of codeine and morphine in water
- 2014
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Ingår i: RSC Advances. - : Royal Society of Chemistry. - 2046-2069. ; 4:74, s. 39519-39522
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Tidskriftsartikel (refereegranskat)abstract
- A water-soluble rhodium complex formed from commercially available [Rh(COD)(CH3CN)(2)]BF4 and 1,3,5-triaza-7-phosphaadamantane (PTA) catalyzes the isomerization of both codeine and morphine into hydrocodone and hydromorphone with very high efficiency. The reaction is performed in water, allowing isolation of the final products by simple filtration, which results in very high isolated yields. The reactions can be easily scaled up to 100 g.
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| 6. |
- Holmberg, Pär
(författare)
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Unique supply function equilibrium with capacity constraints
- 2008
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Ingår i: Energy Economics. - : Elsevier BV. - 0140-9883 .- 1873-6181. ; 30:1, s. 148-172
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Tidskriftsartikel (refereegranskat)abstract
- Consider a market where producers submit supply functions to a procurement auction with uncertain demand, e.g. an electricity auction. In the Supply Function Equilibrium (SFE), every firm commits to the supply function that maximises expected profit in the one-shot game given the supply functions of competitors. A basic weakness of the SFE is the presence of multiple equilibria. This paper shows that with (i) symmetric producers, (ii) perfectly inelastic demand, (iii) a price cap, and (iv) capacity constraints that bind with a positive probability, there exists a unique, symmetric SFE.
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| 7. |
- Holmberg, Pär, et al.
(författare)
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Coupled FEM and lumped circuit model of the electromagnetic response of coaxially insulated windings in two slot cores
- 2007
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Ingår i: European transactions on electrical power. - : Wiley. - 1430-144X .- 1546-3109. ; 17:6, s. 554-568
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a coupled FEM and lumped circuit modelling approach that is primarily intended for high-frequency and overvoltage simulations of rotating electric machines with coaxially insulated windings, such as Powerformer and Motorformer. The magnetic fields and their interaction with the conductors of the winding are simulated with the aid of a FEM-program. The displacement current and its losses are modelled with an external lumped circuit. To consider eddy current losses, the stranded conductors and the laminated steel cores are replaced by homogeneous bodies with similar losses over a wide frequency range. The approach is illustrated and experimentally verified for a set-up with a cable wound around two slot cores. The model agrees well with measurements up to 1 MHz.
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| 8. |
- Holmberg, Pär
(författare)
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Supply Function Equilibrium with Asymmetric Capacities and Constant Marginal Costs
- 2007
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Ingår i: Energy Journal. - 0195-6574 .- 1944-9089. ; 28:2, s. 55-82
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Tidskriftsartikel (refereegranskat)abstract
- This paper analytically derives a Supply Function Equilibrium (SFE) of a real-time electricity market with multiple firms and asymmetric production capacities. There is a unique SFE, which is piece-wise symmetric when firms have identical constant marginal costs. It is believed that some of the properties of the derived SFE are valid for real-time markets in general. Firms’ capacity constraints bind at different prices (i). Still, firms with non-binding capacity constraints have smooth residual demand (ii). Approximating an asymmetric real-time market with a symmetric one, tends to overestimate mark-ups for small positive imbalances and underestimate mark-ups for large positive imbalances (iii).
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| 9. |
- Hästö, Peter, et al.
(författare)
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Some inequalities related to the analysis of electricity auctions
- 2006
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Ingår i: Applied Mathematics Letters. - : Elsevier BV. - 0893-9659 .- 1873-5452. ; 19:8, s. 814-819
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Tidskriftsartikel (refereegranskat)abstract
- Most balancing markets of electric power are organized as uniform-price auctions. In 2001, the balancing market of England and Wales switched to a pay-as-bid auction with the intention of reducing wholesale electricity prices. Numerical simulations of an electricity auction model have indicated that this should lead to decreased average prices. In this work we prove two inequalities which give an analytic proof of this claim in the same model.
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| 10. |
- Holmberg, Pär
(författare)
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Asymmetric Supply Function Equilibrium With Constant Marginal Costs
- 2005
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- In a real-time electric power auction, the bids of producers consist of committed supply as a function of price. The bids are submitted under uncertainty, before the demand by the Independent System Operator has been realized. In the Supply Function Equilibrium (SFE), every producer chooses the supply function maximizing his expected profit given his residual demand. I consider a uniform-price auction with a reservation price, where demand is inelastic and exceed the market capacity with a positive probability, and firms have identical constant marginal costs but asymmetric capacities. I show that under these conditions, there is a unique SFE, which is piece-wise symmetric.
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