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Ohne Windenergie keine Energiewende
(2019)IASS Discussion PaperWir zeigen, wie die vorgeschlagene 1000 m-Abstandsregelung zwischen Windkraftanlagen und Wohngebäude den Ausbau der Windkraft an Land in Deutschland praktisch stoppen würde. Wir zeigen auch, dass ein Abstand von 600 m gleichzeitig den Schutz der Anwohner und der Ausbau der Windkraft möglich machen kann.Working Paper -
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Equilibrium particulate exposure
(2019)IGC Working PaperWe assemble global spatially disaggregated panel data describing ambient particulate levels and transport, population, and economic and polluting activities. These data indicate the importance of country level determinants of pollution, of the equilibrium process that separates or brings together people and particulates, of urbanization, and of the composition of economic activity and energy production. We then develop an Integrated ...Working Paper -
A Tight Degree 4 Sum-of-Squares Lower Bound for the Sherrington-Kirkpatrick Hamiltonian
(2019)arXivWorking Paper -
Cohesive self-organization of mobile microrobotic swarms
(2019)arXivMobile microrobots are envisioned to be useful in a wide range of high-impact applications, many of which requiring cohesive group formation to maintain self-bounded swarms in the absence of confining boundaries. Cohesive group formation relies on a balance between attractive and repulsive interactions between agents. We found that a balance of magnetic dipolar attraction and multipolar repulsion between self-assembled particle chain ...Working Paper -
Managing shutdown risk in merchant commodity and energy production
(2019)SSRNMerchant commodity and energy production assets operate in markets with volatile prices and exchange rates. Producers can choose in each period between production, production suspension, and permanent shutdown. Plant closures, however, adversely affect societal entities beyond the specific plant being shutdown such as the parent company and the local community. Motivated by an aluminum producer, we study if mitigating these hard-to-assess ...Working Paper -
Monolithic shape-programmable dielectric liquid crystal elastomer actuators
(2019)arXivMacroscale robotic systems have demonstrated great capabilities of high speed, precise, and agile functions. However, the ability of soft robots to perform complex tasks, especially in centimeter and millimeter scale, remains limited due to the unavailability of fast, energy-efficient soft actuators that can programmably change shape. Here, we combine desirable characteristics from two distinct active materials: fast and efficient actuation ...Working Paper -
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The near and far of a pair of magnetic capillary disks
(2019)arXivControl on microscopic scales depends critically on our ability to manipulate interactions with different physical fields. The creation of micro-machines therefore requires us to understand how multiple fields, such as surface capillary or electro-magnetic, can be used to produce predictable behaviour. Recently, a spinning micro-raft system was developed that exhibited both static and dynamic self-assembly [Wang et al. (2017) Sci. Adv. ...Working Paper