University of Colorado Boulder

Reproductive numbers and traveling fronts in models of protest dynamics with police management

Protests often spread through social networks and across cities, a phenomenon that can be modeled using reaction–diffusion systems. Building on the model in [10] , which links protest activity and social tension, we study an extended model that also includes police protest manage...

The MISR Research Product Algorithm – producing global, self-consistent, pixel-level aerosol retrievals for the Multi-angle Imaging SpectroRadiometer

Abstract. The MISR Research Aerosol retrieval algorithm (RA) was developed in parallel with the MISR standard operational algorithm (SA), to explore innovative retrieval ideas for possible implementation in the SA, and to provide higher-spatial-resolution results with enhanced se...

Tipping point forecasting in nonstationary dynamics on function spaces

Tipping points are abrupt, drastic, and often irreversible changes in the evolution of nonstationary and chaotic dynamical systems. For instance, increased greenhouse gas concentrations are predicted to lead to drastic decreases in low cloud cover, referred to as a climatological...

Engineering Biohybrid Mycelium Fibers through Hierarchical Structuring and Biomineralization

ABSTRACT Engineered living materials (ELMs) that utilize fungal cells have emerged as a class of functional materials, owing to their ability to self‐assemble, adapt, and regenerate. Filamentous fungi growth promotes the formation of a network of interwoven threads, or mycelia, t...

Understanding Relative Reactivity-Governed Kinetics and Network Formation in Thiol-Yne and Other Competitive Consecutive Polymerizations

Abstract Thiol-yne polymerizations couple two sequential additions of thiol: first, to an alkyne and subsequently, to a vinyl sulfide, making the polymerization and the resulting polymer structure dependent on the relative reactivity. Herein, kinetic, analytical, and random-graph...

Synoptic and regional-scale meteorological controls of stratus altitude in the Namib Desert

Abstract. In the Namib Desert, fog is an essential water source and occurs when and where advected marine stratus clouds intersect with the land surface. However, the meteorological controls of the cloud base height are still insufficiently understood. This study aims to develop...

Multirate Runge–Kutta for Nonlinearly Partitioned Systems

Abstract. Multirate integration is an increasingly relevant tool that enables scientists to simulate multiphysics systems. Existing multirate methods are designed for equations whose fast and slow variables can be linearly separated using additive or componentwise partitions. How...

The Importance of Nanoscale Phenomena in Electrolyte Behavior: Acetonitrile-Aqueous Zinc Sulfate Electrolytes

Abstract Electrolytes composed of mixed solvents are of significant scientific and technological importance in lithium-ion and beyond-lithium-ion batteries, and more broadly across physical chemistry. Their emergence has highlighted the importance of multiscale phenomena, particu...

Are Socioeconomic Status and Time in Preschool Mediators of Shared Environment Variance in Reading Ability?

While socioeconomic status (SES), time in preschool (TiP) and their interaction are related to reading ability, the results have been mixed. This study assessed whether the shared environment mediated these associations using a longitudinal behavior genetic design. Further, this...

Design-logic alignment in digital transformation: A qualitative meta-analysis of Kodak

ABSTRACT Why does an incumbent like Kodak, despite investing early in digital technology, still fail to create and capture value? We argue that Kodak’s fate exemplifies a canonical paradox of digital transformation (DT) because its organisational identity, strategy, and technolog...

Single‐Crystal Helical Covalent Polymers with Organic Counter Cations

ABSTRACT Helical polymers, central to many bioactive molecules and polymers, offer distinctive functional properties, yet the precise synthesis and atomic‐level characterization of artificial helical covalent polymers (HCPs) remain challenging. Here, we demonstrate that soft orga...

Experimental snowball earth viscosity drives the evolution of motile multicellularity

During the 70-million-year Cryogenian Snowball Earth glaciations, low ocean temperatures beneath global sea ice increased water viscosity over 3-fold. Unicellular eukaryotes in this environment would have faced severe constraints on movement and nutrient uptake, while nascent mul...

Temporal transcriptomics identifies transregulation by multiple lncRNAs in human iPSCs

Some long noncoding RNAs (lncRNAs) are known to regulate gene expression. However, the underlying temporal dynamics of lncRNAs influencing gene and epigenetic regulation, and mechanisms of lncRNA regulation in trans , are less understood. To investigate this, we genetically engin...

Controlled SiO2 etching by HF in an HF/H2O liquid-like layer in a vacuum environment

Controlled SiO2 etching was demonstrated using hydrogen fluoride (HF) in an HF/H2O liquid-like layer in a vacuum environment. Under vacuum conditions in the absence of H2O, there was no etching of SiO2 by HF. In the presence of H2O, the SiO2 etch rates were dependent on the HF pr...

Observational Validation of Boundary‐Layer Cloud Regimes in Arctic Cold Air Outbreaks

Abstract Arctic cold air outbreaks (CAOs) produce low‐level cloud patterns influencing the surface radiative balance. The stability parameter (boundary‐layer height over Monin‐Obukhov length) is theorized to distinguish shear‐driven roll convection from buoyancy‐driven cellular c...

UV Inactivation of Bacteria and Viruses on Surfaces: Mechanistic Insights and Testing Method Comparisons

Abstract Accurate evaluation of UV surface disinfection requires understanding of the impacts of testing methods and microbial characteristics on observed inactivation performance. This study evaluated the surface inactivation kinetics of two bacteria and two bacteriophages using...

Prehistoric global migration of vanishing gut microbes with humans

The gut microbiome is crucial for health and is affected strongly by lifestyle1. Many microorganisms commonly found in non-industrialized populations are disappearing or have become extinct in industrialized populations2–6. Studying which microorganisms have been long-term reside...

Constraints on NO x emission in Thailand using GEMS satellite data

Nitrogen oxides (NOx=NO+NO2) are key pollutants that contribute to ozone and secondary aerosol formation, posing environmental and health risks. Accurate simulation and forecasting of NO x pollution is essential for developing mitigation strategies. Local inventories in Thailand...

Plenty of fish in the sea, but only one multimodal feather star robot

A feather star–inspired soft swimming robot achieves multimodal 3D maneuverability with minimal actuation using a mechanically intelligent body design.

The Fluid Mechanics of Stroke

Stroke remains a leading global cause of death and disability, originating from disruption of blood supply to brain tissue either from blockage or rupture of a blood vessel in the brain. Understandably, fluid mechanics plays a critical role in stroke mechanisms, disease manifesta...