A5090958241- Astro and Planetary Science
- Planetary Science and Exploration
- Gamma-ray bursts and supernovae
- Complex Network Analysis Techniques
- Opinion Dynamics and Social Influence
- Space Satellite Systems and Control
- Caching and Content Delivery
- Spacecraft Design and Technology
- Isotope Analysis in Ecology
- earthquake and tectonic studies
- Space Exploration and Technology
- Social Media and Politics
- Distributed Control Multi-Agent Systems
- Information Retrieval and Search Behavior
- Target Tracking and Data Fusion in Sensor Networks
- Neural Networks and Applications
- Radioactive contamination and transfer
- Marine and coastal ecosystems
- Optimization and Search Problems
- Microbial Community Ecology and Physiology
- Geological and Geochemical Analysis
- Geophysics and Gravity Measurements
- High-pressure geophysics and materials
- Evolutionary Game Theory and Cooperation
- Historical Geography and Cartography
Search for Extraterrestrial Intelligence
2023-2024
Carl von Ossietzky Universität Oldenburg
2017
University of California, Santa Barbara
2012-2014
Twitter (United States)
2012-2013
Universität Greifswald
2013
Abstract NASA's Double Asteroid Redirection Test (DART) mission was the first to demonstrate asteroid deflection, and mission's Level 1 requirements guided its planetary defense investigations. Here, we summarize DART's achievement of those requirements. On 2022 September 26, DART spacecraft impacted Dimorphos, secondary member Didymos near-Earth binary system, demonstrating an autonomously navigated kinetic impact into with limited prior knowledge for defense. Months subsequent Earth-based...
The web today is increasingly characterized by social and real-time signals, which we believe represent two frontiers in information retrieval. In this paper, present Early bird, the core retrieval engine that powers Twitter's search service. Although bird builds maintains inverted indexes like nearly all modern engines, its index structures differ from those built to support traditional search. We describe these differences rationale behind our design. A key requirement of ability ingest...
Abstract We report observations of the Didymos–Dimorphos binary asteroid system using Atacama Large Millimeter/submillimeter Array (ALMA) and Compact (ACA) in support Double Asteroid Redirection Test mission. Our on UT 2022 September 15 provided a preimpact baseline first measure Didymos–Dimorphos’s spectral emissivity at λ = 0.87 mm, which was consistent with handful siliceous carbonaceous asteroids measured millimeter wavelengths. postimpact were conducted four consecutive executions each...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 79:235-245 (2017) - DOI: https://doi.org/10.3354/ame01832 Special 6: 'SAME 14: progress and perspectives in aquatic microbial ecology' The functional role of planktonic mixotrophs altering seston stoichiometry Stefanie D. Moorthi1,*, Robert Ptacnik2, W. Sanders3, Fischer1, Michaela Busch1, Helmut Hillebrand1 1Institute...
Schools of fish and flocks birds are examples self-organized animal groups that arise through social interactions among individuals. We numerically study two individual-based models, which recent empirical studies have suggested to explain group behavior: (i) a zone-based model where the communication topology is determined by finite interacting zones repulsion, attraction, orientation individuals; (ii) described Delaunay triangulation, defined each individual's Voronoi neighbors. The models...
Information propagation in social media depends not only on the static follower structure but also topic-specific user behavior. Hence novel models incorporating dynamic behavior are needed. To this end, we propose a model for individual users, termed genotype. The genotype is per-topic summary of user's interest, activity and susceptibility to adopt new information. We demonstrate that genotypes remain invariant within topic by adopting them classification information spread large-scale...
An abstract is not available for this content so a preview has been provided. As you have access to content, full PDF via the ‘Save PDF’ action button.
We explore a real-time Twitter search application where tweets are arriving at rate of several thousands per second. Real-time demands that they be indexed and searchable immediately, which leads to number implementation challenges. In this paper, we focus on one aspect: dynamic postings allocation policies for index structures completely held in main memory. The core issue can characterized as "Goldilocks Problem". Because memory remains today scare resource, an policy is too aggressive...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 611:45-58 (2019) - DOI: https://doi.org/10.3354/meps12852 Growth and grazing control of dinoflagellate Lingulodinium polyedrum in a natural plankton community Michaela Busch1, David Caron2, Stefanie Moorthi1,* 1Institute for Chemistry Biology Environment (ICBM), Carl-von-Ossietzky University Oldenburg, 26382...
Many models of disease and rumor-spreading phenomena average the behavior individuals in a population order to obtain coarse description expected system behavior. For these types models, we determine how close approximation is its corresponding agent-based system. These findings lead general result on logistic information propagation for networks both connected graphs with doubly stochastic edge weights, symmetric weights. Moreover, discuss appropriateness discrete few example heterogeneous...
We use statistical learning methods to construct an adaptive state estimator for nonlinear stochastic systems. Optimal estimation, in the form of a Kalman filter, requires knowledge system's process and measurement uncertainty. propose that these uncertainties can be estimated from (conditioned on) past observed data, without making any assumptions prior distribution. The distribution at each time step is constructed ensemble least-squares estimates on sub-sampled sets data via jackknife...