DIY
Off-Grid ESP32 Flood-Stage Sensor: Cutting Standby From 20 mA to Under 100 µA on a $70 Solar Node
Full open-hardware build: ultrasonic stage sensing, LiFePO4 pack, and the dev-board parasitic draw that wastes 89% of a node's daily energy.
Water
Deepsea
Underwater Acoustic Target Recognition: 2026 Strategy Report
Intelligence report on lightweight hybrid attention networks for underwater acoustic target recognition: ShipsEar, DeepShip, AUKUS, Replicator.
Water
How to Build a Self-Contained Wastewater Treatment IBC Tote System: A 150 GPD Design Guide
A hybrid MBBR plus UF train fits a 275-gal IBC footprint, draws 2 kWh/day, and meets NSF/ANSI reuse grade. Aeration energy is the binding constraint.
Water
Containerized Water Treatment for Residential Development: MBR, MBBR, and Modular Bioreactors as an Alternative to Centralized Sewers
Containerized MBR bioreactors can serve greenfield subdivisions in weeks, not years.