Georgia Institute of Technology

Unraveling the PFAS Helix: A Statistical Approach

Abstract The extreme persistence of per- and polyfluoroalkyl substances (PFAS) in the environment is rooted in their three-dimensional molecular conformation. The helical twist adopted by perfluoroalkyl chains due to hyperconjugation involving their recalcitrant C–F bonds governs...

Optimal Flight Planning for Marine Mammal Surveillance from a Seaplane Unmanned Aerial Vehicle

Unmanned aerial vehicles are playing an increasing role in environmental monitoring and wildlife conservation activities. This paper describes an optimal flight planning algorithm for a solar-powered unmanned aerial vehicle designed to search for and identify whales in the open o...

Protein expression derived from scRNA-seq reveals lupus-induced acceleration of immune aging

Single-cell RNA sequencing (scRNA-seq) is widely established and excels at capturing transcriptional heterogeneity and signaling states. However, it lacks direct quantification of surface proteins, which are key determinants of immune cell identity and function. To enable protein...

Quantum Dot-Induced Kinetic Bottleneck in Singlet Exciton Relaxation of Conjugated Polymer Aggregates

Abstract We designed hybrid aggregate model systems with cascade energy alignment from conjugated polymers (CPs) to quantum dots (QDs) to investigate the effects of QDs on CP singlet (S1) excitons. Radiative recombination of S1 excitons occurs within 1 ps in the chlorinated CP/QD...

ThermoPix: an electronic-photonic temperature sensor array with microsecond row readout

Abstract This paper presents ThermoPix, a CMOS-compatible electronic–photonic architecture for high-spatial-resolution temperature sensing. The proposed system converts temperature-induced wavelength shifts in a photonic interferometric sensor into timing information that can be...

Prenatal cannabis exposure associated with altered brain connectivity: neural correlates of cognitive and mental health variability in offspring

Emerging evidence from human and preclinical studies suggests that prenatal cannabis exposure (PCE) may be associated with offspring neurodevelopmental outcomes. Although prior studies have linked PCE to cognitive and mental health differences in offspring, the large-scale functi...

Synchronization and Averaging in Partially Hyperbolic Systems with Fast and Slow Variables

Abstract We consider a family of dynamical systems obtained by coupling an Anosov map on the two-dimensional torus—the chaotic system —with the identity map on the one-dimensional torus—the neutral system —through a dissipative interaction. Firstly, we show that the two systems s...

Characterization of Rock Fabric and Its Influence on Water Occurrence in Tight Gas Reservoirs

Abstract After hydraulic fracturing, the flowback rates of some tight gas reservoirs are less than 50%, which seriously affects tight gas production. Regarding the fracturing fluid retention mechanism in tight gas reservoirs, it is still unclear. This research focused on the rock...

Ultrahigh flow strength in shocked nanopolycrystalline diamond

Extreme pressures and temperatures create conditions that allow even hard and brittle materials to flow plastically. Despite extensive research, the limits of flow strength under such conditions remain uncertain, and the mechanisms driving deformation at the relevant stresses are...

Structure of Li3YCl6 and Its Effect on Lithium Ionic Conductivity

Abstract Halide-based Li+ solid-state electrolytes have garnered renewed interest in recent years, mainly because of their significantly improved Li+ ionic conductivity and excellent stability against high-voltage cathodes. Numerous studies have reported that synthetic conditions...

When Too Many Cooks Spoil the Broth: Three Failure Modes of Multi-Agent LLM Reliability

Multi-agent LLM systems are widely deployed under three implicit assumptions: that self-confidence calibration transfers to peer evaluation, that errors made by distinct instances are statistically independent, and that any sufficiently calibrated model is an equivalent verifier....

Profiling a Rydberg-Atom Electric Field Sensor for Off-Resonant Detection of Sub-100 MHz RF Signals

We present a Rydberg-Atom electric field sensor optimized to detect signals at sub-100 MHz carrier frequencies. The sensing setup employs a sapphire vapor cell that allows for detection of signals below 100 MHz—typical vapor cells made of glass or quartz demonstrate strong screen...

Cyclic Ion Mobility Separations of Free Oxylipins

Abstract Oxylipins are oxygenated lipid metabolites derived from polyunsaturated fatty acids (PUFAs). They play interconnected roles in physiological processes such as inflammation and vascular function, and their dysregulation has been linked to diseases, including cardiovascula...

Direct Air CO2 Capture via Hot Water Cycling of Poly(ethyleneimine)/Silica Hollow Fiber Sorbents

Abstract Hollow fiber sorbents containing amine-infused mesoporous silicas are promising materials for CO2 capture from ambient air due to their ease of heat integration and low pressure drops. This advanced sorbent design permits a wide range of heat source integration options,...

Paving the way for more accessible cancer care in low-income countries with optimization

Abstract Cancers are a growing cause of morbidity and mortality in low-income countries. Geographic access plays a key role in both timely diagnosis and successful treatment. In areas lacking well-developed road networks, seasonal weather events can lengthen already long travel t...

Kinetic Modeling of Enzymatic Cephalexin Synthesis with Neural ODEs and Surrogate-Accelerated Bayesian Inference

Abstract α-Amino ester hydrolases offer a promising route to the stereoselective synthesis of β-lactams such as cephalexin. However, published kinetic studies have encountered difficulty when extended beyond fitting of the data, indicating practical nonidentifiability of the unde...

Relaxation approach to quantum-mechanical modeling of ferroelectric and antiferroelectric phase transitions

Ferroelectrics and antiferroelectrics are the electric counterparts of ferromagnets and antiferromagnets. These materials undergo temperature- and electric-field-induced phase transitions that give rise to their characteristic hysteresis loops. Modeling such hysteresis loops and...

Bioinspired fabric architecture harnessing anisotropy for omnidirectional mechanical protection

Powder bed fusion (PBF)-printed fiber-reinforced composites often exhibit powder-recoating-induced anisotropy, resulting in direction-dependent mechanical behavior that limits reliability under multidirectional loading. Inspired by the surface-following alignment of enamel rods i...

Quantifying pain in persistent spinal pain syndrome: a pilot protocol using spectrogram analysis and PROMIS score correlation

Persistent spinal pain syndrome (PSPS) is a debilitating condition that affects millions of individuals and presents unique challenges for effective assessment and management. Pain is often evaluated using self-report measures, which can be influenced by psychological, social, an...

Inclusion and assistive technologies in disability rights legislation: a cross-country NLP-based comparative analysis

Abstract This study analyzes and compares the thematic structures of two landmark disability rights laws: the Americans with Disabilities Act (ADA) and the Lei Brasileira de Inclusão da Pessoa com Deficiência (Brazilian Law of Inclusion, BLI; Law No. 13.146/2015), to explore how...