Polyzwitterionic Hydrogels for Efficient Atmospheric Water Harvesting

A periodic folded piezoelectric beam for efficient vibration energy harvesting

Periodic piezoelectric beams have been used for broadband vibration energy harvesting in recent years. In this paper, a periodic folded piezoelectric beam (PFPB) is introduced. The PFPB has special features that distinguish it from other periodic piezoelectric beams. The Adomian decomposition method (ADM) is used to calculate the first two band gaps andtwelve natural frequencies of the PF...

Polymer Nanocomposite Hydrogels for Water Purification

Bioinspired Breathable Architecture for Water Harvesting

Thuja plicata is a coniferous tree which displays remarkable water channelling properties. In this article, an easily fabricated mesh inspired by the hierarchical macro surface structure of Thuja plicata branchlets is described which emulates this efficient water collection behaviour. The key parameters are shown to be the pore size, pore angle, mesh rotation, tilt angle (branch droop) and laye...

Receding Horizon Control for Atmospheric Energy Harvesting by Small UAVs

This paper discusses energy harvesting by small Uninhabited Aerial Vehicles (UAV s). A receding horizon controller which computes a sequence of pitch rate commands with the goal of maximizing energy gain over a fixed horizon is derived. An energy based reward function is used to maximize energy gain with only local knowledge of atmospheric wind conditions. Terms are included in the developed re...

Performance of Sulfonated Polyacrylamide/Chromium Triacetate Hydrogels for Water Shut-off Treatment

A hydrogel was prepared by crosslinking aqueous solutions of sulfonated polyacrylamide/chromium triacetate for use in water shut off operations. Gel swelling and the effects of salinity, injection time and flow rate on residual resistance factor (Frr) were investigated. In the presence of electrolytes, gel swelling decreased by about 80%. Results showed that oil permeability increased as inject...