Quantitative easing

Quantitative easing (QE) is a monetary policy action where a central bank purchases predetermined amounts of government bonds or other financial assets in order to stimulate economic activity. Quantitative easing is a novel form of monetary policy that came into wide application after the financial crisis of 20072008. It is used to mitigate an economic recession when inflation is very low or negative, making standard monetary policy ineffective. Quantitative tightening (QT) does the opposite, where for monetary policy reasons, a central bank sells off some portion of its holdings of government bonds or other financial assets. Similar to conventional open-market operations used to implement monetary policy, a central bank implements quantitative easing by buying financial assets from commercial banks and other financial institutions, thus raising the prices of those financial assets and lowering their yield, while simultaneously increasing the money supply. However, in contrast to norm

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EPFL1977

Light Management: A Key Concept in High-Efficiency Perovskite/Silicon Tandem Photovoltaics

Christophe Ballif, Daniel Anthony Jacobs, Florent Sahli

The remarkable recent progress in perovskite photovoltaics affords a novel opportunity to advance the power conversion efficiency of market-dominating crystalline silicon (c-Si) solar cells. A severe limiting factor in the development of perovskite/c-Si tandems to date has been their inferior light-harvesting ability compared to single-junction c-Si solar cells, but recent innovations have made impressive headway on this front. Here, we provide a quantitative perspective on future steps to advance perovskite/c-Si tandem photovoltaics from a light-management point of view, addressing key challenges and available strategies relevant to both the 2-terminal and 4-terminal perovskite/c-Si tandem architectures. In particular, we discuss the challenge of achieving low optical reflection in 2-terminal cells, optical shortcomings in state-of-the-art devices, the impact of transparent electrode performance, and a variety of factors which influence the optimal bandgap for perovskite top-cells. Focused attention in each of these areas will be required to make the most of the tandem opportunity.

AMER CHEMICAL SOC2019

Methodology for Comparing Strategies in Seismic Risk Management of Existing Building Population

Marc Badoux, Vincent Pellissier

This paper presents the approach of a current research project at the EPFL in the area of seismic risk management. The objective of the project is to define and test a methodology for the quantitative characterization and comparison of intervention strategies in a risk management framework. A tool to assist in the selection of an intervention strategy will be developed. The project includes a pilot project for the seismic risk management of a small town in Switzerland. The selection of an intervention strategy raises two categories of problems. The first is connected to the quality of the information available. The second is connected to the variety of the criteria integrated in the decision-making process. The use of multi-criteria methods facilitates decision-making. Concerning the type of multi-criteria methods, experience has drawn attention to the quality of the “surclassement” methods (e.g. ELECTRE), because they can deal equally with qualitative or quantitative criteria.

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Monetary policy is the policy adopted by the monetary authority of a nation to affect monetary and other financial conditions to accomplish broader objectives like high employment and price stability

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The Great Depression (19291939) was an economic shock that impacted most countries across the world. It was a period of economic depression that became evident after a major fall in stock prices i