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Aridity drives coordinated trait shifts but not decreased trait variance across the geographic range of eight Australian trees
(2020)bioRxivContext Large intraspecific functional trait variation strongly impacts many aspects of natural communities and ecosystems, yet is inconsistent across traits and species. Approach We measured within-species variation in leaf mass per area (LMA), leaf dry matter content (LDMC), branch wood density (WD), and allocation to stem area vs. leaf area in branches (branch Huber value, HV) across the aridity range of seven Australian eucalypts ...Working Paper -
On the endpoint behaviour of oscillatory maximal function
(2020)arXivInspired by a question of Lie, we study boundedness in subspaces of L1(R) of oscillatory maximal functions. In particular, we construct functions in L1(R) which are never integrable under action of our class of maximal functions. On the other hand, we prove that these maximal functions map certain classes of spaces resembling Sobolev spaces into L1(R) continuously under mild curvature assumptions on the phase γ.Working Paper -
Bio-inspired Flexible Twisting Wings Increase Lift and Efficiency of a Flapping Wing Micro Air Vehicle
(2020)arXivWe investigate the effect of wing twist flexibility on lift and efficiency of a flapping-wing micro air vehicle capable of liftoff. Wings used previously were chosen to be fully rigid due to modeling and fabrication constraints. However, biological wings are highly flexible and other micro air vehicles have successfully utilized flexible wing structures for specialized tasks. The goal of our study is to determine if dynamic twisting of ...Working Paper -
Characterization and Thermal Management of a DC Motor-Driven Resonant Actuator for Miniature Mobile Robots with Oscillating Limbs
(2020)arXivIn this paper, we characterize the performance of and develop thermal management solutions for a DC motor-driven resonant actuator developed for flapping wing micro air vehicles. The actuator, a DC micro-gearmotor connected in parallel with a torsional spring, drives reciprocal wing motion. Compared to the gearmotor alone, this design increased torque and power density by 161.1% and 666.8%, respectively, while decreasing the drawn current ...Working Paper -
Weak differentiability for fractional maximal functions of general Lp functions on domains
(2020)arXivLet Ω⊂Rn be bounded a domain. We prove under certain structural assumptions that the fractional maximal operator relative to Ω maps Lp(Ω)→W1,p(Ω) for all p>1, when the smoothness index α≥1. In particular, the results are valid in the range p∈(1,n/(n−1)] that was previously unknown. As an application, we prove an endpoint regularity result in the domain setting.Working Paper -
Global post-translational modification profiling of HIV-1-infected cells reveals mechanisms of host cellular pathway remodeling
(2020)bioRxivViruses must effectively remodel host cellular pathways to replicate and evade immune defenses, and they must do so with limited genomic coding capacity. Targeting post-translational modification (PTM) pathways provides a mechanism by which viruses can broadly and rapidly transform a hostile host environment into a hospitable one. We used quantitative proteomics to measure changes in two PTM types – phosphorylation and ubiquitination – ...Working Paper -
On spline interpolation in ellipsoidal geometry and its application in geodesy
(2020)Working Paper -
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 -
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