Although widely in use throughout Europe and the U.K. for some time now, the Screw is a newcomer in North America.

On the basis of previous studies carried out in Europe which
supported the claims to fish-friendliness, the first Ontario Screw
installation was installed in 2013.

Literally thousands of fish passages have been monitored and recorded
using underwater cameras at the intake, inside the chamber of the Screw
itself and at the outflow to assess the effect of the Screw on
salmonids (including smolts and kelts), brown trout and eels. The trials
looked at fish passage across a broad spectrum of sizes and turbine
speeds, possibly the most impressive of which was the safe passage of a
kelt measuring 98cm in length and weighing 7.6kg.

The European studies conclude that the Archimedean Screw turbine is
indeed fish- friendly with no adverse physical effect on fully grown
fish or kelts; at most 1.4% of smolts sustaining limited and recoverable
scale loss (NB ‘at most’ because these were wild fish and quite likely
to have sustained some scale damage prior to entry into the turbine) and
just 1 out of 160 eels (0.64%) suffered minor and recoverable pinching
to the tail. In addition, behavioural and migrational patterns across
the species have been shown to be entirely unaffected by the turbine.

Archimedes Screw Generators – GreenBug Energy – micro hydro


Tuning in to magnetic ink

A new ink containing iron-oxide nanoparticles can be turned into fully printed and versatile components for cellular networks.

Inkjet printing technology can be used to produce radio frequency devices, such as antennas, that can be magnetically reconfigured on demand. This discovery by a team from KAUST boosts prospects for inexpensive electronics that work worldwide by tuning in to multiple cellular bands and standards.

A typical cellphone antenna is made by depositing metallic patterns onto insulating silicon or glass wafers. These miniature aerials have excellent reliability, but only operate at fixed frequency bands. To fabricate devices that can adapt to different wireless settings, researchers are increasingly turning to magnets. Replacing an insulating wafer with a magnetic one, for instance, can achieve frequency tuning that can cover mega- to gigahertz ranges.

Instead of the complex, multilayered ceramics currently used as magnetic substrates, Mohammad Vaseem, Atif Shamim and colleagues investigated an approach based on printable electronics-a technology that replaces the dye-filled fluids found in consumer printers with special inks containing substances, such as metallic nanoparticles, and then custom-prints device patterns with relative ease and high speeds.

Read more.



Impressive Underground Refrigerator That Doesn’t Use Electricity 

Dutch Designer Floris Schoonderbeek constructed a “groundfridge,” which is completely operated without electricity. With the use of the insulation of the ground and the water’s cool temperature, the refrigeration remains at a temperature of 12 degrees Celsius. 

Portable root cellar!