Dead Battery? Wind Power, The Spot Market, and Hydro Power Interaction in the Nordic Electricity Market

It is well established within both the economics and power system engineering literature that hydro power can act as a complement to large amounts of intermittent energy. In particular, hydro power can act as a "battery" where large amounts of wind power are installed. This paper attempts to extend that literature by describing the effects of cross-border wind and hydro power interaction in a day-ahead "spot" market. I use simple econometric distributed lag models with data from the Nordic electricity market and a sample of Norwegian hydro power plants with water storage magazines. I suggest that wind power mainly affects prices in the hydro power area by way of shifting the shadow value of water. The empirical results support this view.Wind Power; Hydro Power; Nordic Electricity Market; Empirical

The Decision to Scrap a Wind Turbine: Opportunity Cost, Timing and Policy

This paper attempts to empirically identify the key factors involved in the decision to scrap a wind turbine using data from Denmark. The importance of the opportunity cost of operating an older wind turbine is shown to be a prominent factor in the decision to scrap. I show the strong effect that renewable energy policy plays in the decision to scrap a turbine. Through the use of both non-parametric and semi-parametric duration models and an instrumental variables approach I identify a strong effect for scrapping schemes put in place by the Danish government. I also obtain the, initially, counter-intuitive result that more effective wind turbines have a higher hazard of being scrapped.Wind Power; Denmark; Empirical; Duration Models; Scrapping

Rocket noise filtering system using digital filters

A set of digital filters is designed to filter rocket noise to various bandwidths. The filters are designed to have constant group delay and are implemented in software on a general purpose computer. The Parks-McClellan algorithm is used. Preliminary tests are performed to verify the design and implementation. An analog filter which was previously employed is also simulated

The effect of oil prices on offshore production : evidence from the Norwegian continental shelf

I use detailed field-level data on Norwegian o↵-shore oil field production and a semi-parametric additive model to control for the production profile of fields to estimate the e↵ect of oil prices on production. I find no significant evidence of a concurrent reaction of field production to oil prices, though a slight lagged e↵ect is found of the magnitude of approximately 2 to 4% for a 10 dollar per barrel increase in the real price of oil. Most of this e↵ect appears to come in the planning phase of a field’s development

The information continuum model of evolution

Most biologists agree that evolution is contingent on inherited information shaped by natural selection. This apparent consensus could be taken to indicate agreement on the forces shaping evolution, but vivid discussions reveal divergences on how evolution is perceived. The predominant Modern Synthesis (MS) paradigm holds the position that evolution occurs through random changes acting on genomic inheritance. However, studies from recent decades have revealed that evolutionary inheritance also includes DNA-methylation, RNA, symbionts, and culture, among other factors. This has fueled a demand of a broader evolutionary perspective, for example from the proponents of the Extended Evolutionary Synthesis (EES). Despite fundamental disagreements the different views agree that natural selection happens through dissimilar perpetuation of inheritable information. Yet, neither the MS, nor the ESS dwell extensively on the nature of hereditary information. We do - and conclude that information in and of itself is immaterial. We then argue that the quality upon which natural selection acts henceforth is also immaterial. Based on these notions, we arrive at the information-centric Information Continuum Model (ICM) of evolution. The ICM asserts that hereditary information is embedded in diverse physical forms (DNA, RNA, symbionts etc.) representing a continuum of evolutionary qualities, and that information may migrate between these physical forms. The ICM leaves theoretical exploration of evolution unrestricted by the limitations imposed by the individual physical forms wherein the hereditary information is embedded (e.g. genomes). ICM bestows us with a simple heuristic model that adds explanatory dimensions to be considered in the evolution of biological systems.publishedVersio

The Effect of Oil Price on Field Production: Evidence from the Norwegian Continental Shelf

Abstract I use detailed field-level data on Norwegian off-shore oil field production and a semi-parametric additive model to control for the production profile of fields to estimate the effect of oil prices on production. I find no significant evidence of a concurrent reaction of field production to oil prices, though a slight lagged effect is found of the magnitude of approximately 2 to 4% for a 10 dollar per barrel increase in the real price of oil. Most of this effect appears to come in the planning phase of a field's development

A study of the large scale circulation and water mass formation in the Nordic seas and Arctic ocean

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and the Woods Hole Oceanographic Institution, 1994.Includes bibliographical references (leaves 205-212).by Cecilie Mauritzen.Ph.D

The Decision to Scrap a Wind Turbine: Opportunity Cost, Timing and Policy

Abstract This paper attempts to empirically identify the key factors involved in the decision to scrap a wind turbine using data from Denmark. The importance of the opportunity cost of operating an older wind turbine is shown to be a prominent factor in the decision to scrap. I show the strong effect that renewable energy policy plays in the decision to scrap a turbine. Through the use of both non-parametric and semi-parametric duration models and an instrumental variables approach I identify a strong effect for scrapping schemes put in place by the Danish government. I also obtain the, initially, counter-intuitive result that more effective wind turbines have a higher hazard of being scrapped