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All published content in one place — writing, notes, projects, and poetry. Filter by collection or tag.
15 entries
ProjectCarbonifyBuilding biochar-based biological agri-input products for Indian farms — adding stable carbon to soil, restoring soil biology, and improving climate resilience for smallholder farmers.ProjectCodeCraft AcademyAn AI-powered Python learning web app with an in-browser code editor and a conversational AI tutor that generates lessons and explanations on-demand — built so beginners can learn by doing and asking, not by watching.ProjectMaati AIA WhatsApp-first AI assistant for Indian farmers — answering questions on fertilizers, mandi prices, weather, and crop health in their own language, where they already are.Poetryएक अभिलाषामाँ के आँचल और पिता के चरणों में लौट जाने की अभिलाषा। A longing to return — to rest in a mother's embrace and bow at a father's feet.WritingFrom Molecule to Flame: Building a Complete Combustion Model for HMXStarting from quantum mechanics calculations of individual bond-breaking events and ending with a model that correctly predicts burn rates across pressures — this is the story of assembling a first-principles combustion model for HMX, and what it took to make the pieces fit together.WritingWhat Happens in the First Microseconds: Using Quantum Mechanics to Map How RDX and HMX Begin to DecomposeBefore you can model or predict the combustion of an energetic material, you have to know what actually happens at the molecular level when it starts to break down. This is the story of using quantum mechanics calculations to answer that question for RDX and HMX — two of the most important explosives and propellant ingredients in use today.Writing750× Faster: Making Detailed Chemical Kinetics Usable in Engine SimulationDetailed reaction mechanisms are physically accurate but computationally intractable in engineering simulation. This is the story of two methods — tabulated chemistry and machine learning tabulation — that recover that accuracy at engineering speeds, and what they enable for engine design and emissions prediction.WritingNewton–GMRES and Preconditioning for Stiff ChemistryA fully self-contained first-principles walkthrough of stiffness, implicit integration, Newton solves, GMRES, and structure-aware preconditioning for chemistry ODE systems — with an interactive lab embedded to explore the solver data directly.ProjectNewton–GMRES Interactive LabAn interactive visual lab embedded in the Newton–GMRES article — explore solver traces from a 60-species stiff chemistry system and see why preconditioning collapses GMRES iteration counts from 172 to 4.NotesStiffness and Implicit Integration — Working NotesField notes on why combustion ODE systems are stiff, what stiffness actually means numerically, and how implicit integrators handle it in practice.NotesMagnesium and the Lightweighting Path to DecarbonizationTransportation is ~30% of global emissions. One underappreciated lever is lightweighting — and magnesium, the lightest structural metal, is getting a second look as seawater-based production makes clean manufacturing feasible for the first time.NotesMatching Energy Storage to Application: The Ragone PerspectiveNot all storage technologies are interchangeable. The Ragone plot — power density vs energy density — reveals why capacitors, electrochemical batteries, and chemical/mechanical storage occupy distinct niches, and why mismatching technology to application is expensive.NotesEROI: Why the Comparison Between Fossil Fuels and Renewables Is Usually WrongEnergy Return on Investment is the right metric for comparing energy sources — but most popular comparisons measure EROI at the point of extraction rather than point of use. When you account for the full chain, the picture looks very different from the conventional wisdom.NotesRound-Trip Efficiency of Energy Storage: What the Numbers Actually MeanRTE tells you how much electricity you recover from a storage system compared to what you put in. The numbers vary dramatically across technologies — from 85% for lithium-ion to 25% for hydrogen — and understanding why reveals the physics of each approach.NotesThe Thermodynamic Limits of Direct Air CaptureDAC is a fight against entropy. The second law of thermodynamics sets an absolute energy floor of 120 kWh per tonne of CO₂ — and current technology is only 7–8% efficient against that floor. The numbers matter for how seriously we should take DAC as a climate solution.