We show that the level of market-efficiency in the five largest cryptocurrencies is highly time-varying. Specifically, before 2017, cryptocurrency-markets are mostly inefficient. This corroborates recent results on the matter. However, the cryptocurrency-markets become more efficient over time in the period 2017–2019. This contradicts other, more recent, results on the matter. One reason is that we apply a longer sample than previous studies. Another important reason is that we apply a robust measure ...
Tópico(s): Financial Markets and Investment Strategies
2019 - Elsevier BV | Finance research letters
Richard Olsen, Kim Nes Leirvik, Bjørn Kvamme, Tatiana Kuznetsova,
Carbon capture and storage is an attractive method of reducing carbon dioxide release to the atmosphere. One possibility is to inject carbon dioxide into underground aquifers. Injection wells consist of steel casings supported by cement (or plugged by cement, if abandoned), which contains large quantities of calcium oxide that can react with carbon dioxide to form calcium carbonate. Cement also contains various other clay materials similar to calcium carbonate. Pores between steel and cement make ...
Tópico(s): Concrete and Cement Materials Research
2016 - American Chemical Society | The Journal of Physical Chemistry C
Ingvild Flaskerud, Oddbjørn Leirvik,
What do we understand by the study of Islamic theology within the European academic framework? In this issue of Islam and Christian-Muslim Relations, scholars of Christian and Islamic theology and of religious studies debate how to construct theoretical and empirical contexts around 'Islamic theology' as an academic discipline that is profoundly etic, and for doing theology as an emic praxis. The question concerns how we design course programmes, curricula and research projects. What are the implications ...
Tópico(s): Education and Islamic Studies
2018 - Routledge | Islam and Christian–Muslim Relations
Tor Nordam, Emma Litzler, Jørgen Skancke, Ivar Singsaas, Frode Leirvik, Øistein Johansen,
Oil slick thickness is a key parameter for the behaviour of oil spilled at sea. It influences evaporation and entrainment, viable response options, and the risk to marine life at the surface. Determining this value is therefore of high relevance in oil spill modelling. In open water, oil can spread as thin films due to gravity alone, and may be further dispersed by horizontal diffusion and differential advection. In the presence of ice, however, a thin oil slick may become concentrated to higher ...
Tópico(s): Atmospheric chemistry and aerosols
2020 - Elsevier BV | Marine Pollution Bulletin
... included here, I appreciate the focus of Oddbjørn Leirvik's essay on humanism and secularity in relation to interfaith studies. Leirvik's 2014 book, Interreligious Studies: A Relational Approach ...
Tópico(s): Religion and Society Interactions
2024 - Wiley | The Heythrop Journal
Trude Storelvmo, Menghan Yuan, Thomas Leirvik, Kari Alterskjær, Peter C.B. Phillips, Chris Smith,
... method correctly diagnoses TCR from 20 CMIP6 ESMs if the same input variables are taken from the ...
Tópico(s): Energy, Environment, Economic Growth
2025 - IOP Publishing | Environmental Research Letters
In this paper I develop a framework for the optimal investments in bonds when market liquidity is stochastic. The price of the investable zero-coupon bond is affected by time varying market liquidity. I find that this has several implications for the optimal investment strategies in this bond. The trading policy is found in closed form and can be decomposed into three terms. The usual mean variance term is found to be time- dependent. The investor will also hedge both interest rate risk and liquidity ...
Tópico(s): Insurance and Financial Risk Management
2011 - RELX Group (Netherlands) | SSRN Electronic Journal
I investigate how transaction costs affect the optimal portfolio policy when volatility is stochastic. I find an analytical expression of the minimal size of the no trade region. This enables us to analyze the liquidity premium related to instantaneous volatility. I find the liquidity premium to be time dependent. With a finite investment horizon, the liquidity premium increases as the investment horizon approaches. I also find that the size of the liquidity premium is twice as large if the correlation ...
Tópico(s): Financial Markets and Investment Strategies
2011 - RELX Group (Netherlands) | SSRN Electronic Journal
We show that the level of market-efficiency in the five largest cryptocurrencies is highly time-varying. Specifically, before 2017, cryptocurrency-markets are mostly inefficient. This corroborates recent results on the matter. However, the cryptocurrency-markets become more efficient over time in the period 2017-2019. This contradicts other, more recent, results on the matter. One reason is that we apply a longer sample than previous studies. Another important reason is that we apply a robust measure ...
Tópico(s): Complex Systems and Time Series Analysis
2019 - RELX Group (Netherlands) | SSRN Electronic Journal
Muhammad Kashif, Thomas Leirvik,
We investigate the relationship between hybrid tail covariance risk (HTCR) and expected return over the last four decades. Despite a significant positive HTCR-expected return relationship in Bali et al. (2014) , we find that this relationship is not significant at least during average market conditions. However, if we control for market regime the relationship starts to appear. We find a strong link between market volatility and the relationship between HTCR and expected returns. We analyze this relationship ...
Tópico(s): Risk and Portfolio Optimization
2021 - RELX Group (Netherlands) | SSRN Electronic Journal