Hunter Heidenreich | ML Research Scientist — Page 26

Computational Social Science
Visualization of party-based legislative embeddings

Party Matters: Enhancing Legislative Vote Embeddings

This paper introduces a neural architecture that combines bill text embeddings (CNN/MWE) with sponsor ideology metadata to improve vote prediction accuracy, particularly in out-of-session contexts where political dynamics shift.

Optical Chemical Structure Recognition
Five-stage pipeline for reconstructing chemical molecules from raster images

Reconstruction of Chemical Molecules from Images

This methodological paper proposes a comprehensive pipeline to digitize chemical structure images. It achieves 97% reconstruction accuracy on benchmarks by combining a topology-preserving vectorizer with a chemical knowledge validation module.

Scientific Computing
Three-dimensional Brownian motion trajectory showing random walk behavior

Second-Order Langevin Equation for Field Simulations

Proposes the Hyperbolic Algorithm for Euclidean field theory simulations. By adding a second-order fictitious time derivative to the Langevin equation, the method reduces systematic errors from O(ε) down to O(ε²).

Molecular Simulation
Visualization of the Stillinger-Weber potential showing the two-body radial term and three-body angular penalty

Stillinger-Weber Potential for Silicon Simulation

Stillinger and Weber propose a 3-body interaction potential that stabilizes the diamond crystal structure of silicon and reproduces liquid properties through molecular dynamics, addressing the inability of standard pair potentials to model tetrahedral semiconductors.

Computational Social Science
Hierarchical Ideal Point Topic Model visualization showing political polarization

Tea Party in the House: Legislative Ideology via HIPTM

This paper introduces the Hierarchical Ideal Point Topic Model (HIPTM) to analyze the 112th U.S. Congress. By jointly modeling votes and text, it uncovers how Tea Party Republicans and establishment Republicans differ in both voting records and how they frame specific policy issues.

Evolutionary Biology
Electron microscope image of Pyrolobus fumarii showing irregular coccoid cell structure

Three Domains of Life: Woese's Phylogenetic Revolution

This paper established the three-domain classification system (Bacteria, Archaea, Eucarya) based on molecular evidence from ribosomal RNA sequences, arguing that the prokaryote-eukaryote dichotomy obscures the deep evolutionary divergence of Archaea from Bacteria.

Molecular Simulation
Visualization of argon dimer on fcc(111) surface

Adatom Dimer Diffusion on fcc(111) Crystal Surfaces

This molecular dynamics study reveals that adatom dimers on fcc(111) surfaces exhibit simultaneous multiple jumps at intermediate temperatures, migrating with mobility comparable to single adatoms.

Scientific Computing
Abstract visualization of seven basis vectors represented as curved lines with dots, centered around a psi symbol

AI & Physical Sciences Taxonomy: A Seven-Vector Framework

Personal working taxonomy for categorizing papers as Method, Theory, Resource, Systematization, Position, Discovery, or Application contributions using a superposition model.

Molecular Simulation
Delayed convolution approximation for distinct Van Hove function showing comparison between simulated data and theoretical model

Correlations in the Motion of Atoms in Liquid Argon

This work validated classical Molecular Dynamics for simulating liquids, revealing the ‘cage effect’ in velocity autocorrelation and establishing predictor-corrector integration algorithms for N-body problems.

Planetary Science
Conceptual cross-section of the Cloud Continent proposal showing three layers: the CO2 atmosphere below, the nitrogen-filled honeycomb structure at 50 km altitude, and the habitable atmosphere above

Terraforming Venus With the Cloud Continent Proposal

A speculative 2022 engineering proposal for terraforming Venus by constructing a nitrogen-filled honeycomb structure floating at 50 km altitude where temperature and pressure are Earth-like, avoiding the need to remove Venus’s massive atmosphere while using CO2 electrolysis to produce breathable oxygen and carbon nanostructures for construction.

Planetary Science
Venus as seen by Mariner 10, showing swirling cloud patterns in the dense atmosphere

Venus Evolution Through Time: Key Questions and Missions

A comprehensive 2023 roadmap for Venus exploration synthesizing open questions about the planet’s evolution from potentially habitable to extreme greenhouse state, detailing the coordinated VERITAS, DAVINCI, and EnVision missions planned for the 2030s and identifying future technology requirements for answering fundamental habitability questions.

Planetary Science
Venus as seen by Mariner 10, showing swirling cloud patterns in the dense atmosphere

Life on Venus? Astrobiology and the Habitability Limits

A deep dive into the physical limits of life on Venus, reviewing Charles Cockell’s foundational 1999 analysis while connecting it to modern discoveries like the 2020 phosphine detection and upcoming DAVINCI+ missions.