Tuesday, 23 January 2018

What is a WEC?

A WEC is a wave energy converter. The European Marine Energy Centre in Orkney has a classification for different types of WECs, ranging from Attenuator to Rotating Mass converters.

Sidebar - The largest island on the Orkney archipelago (roughly 70 islands) is Mainland, derived from Old Norse Meginland.

Sunday, 7 January 2018

War for the Planet of the Apes (2017)

Andy Serkis plays Caesar. Nassau County-born Matt Reeves directs. With a $150m budget, and $490m box office, WOPA was a financial success. Novelist Pierre Boulle created the concept underlying the franchise with his 1963 novel "La Planète des Singes" (initially released in the UK as "Monkey Planet").

Sunday, 12 November 2017

Lime Plaster

Lime plaster is a type of plaster consisting of sand, water and lime. One of the earliest known examples of its use is at Ain Ghazaal in Jordan.

Sunday, 22 October 2017

Reinventing Bathrooms

The Duravit line also sports matching bathroom furniture.

Reinventing Radio

Ruark Audio makes modern radios.

Sunday, 1 October 2017

What is the Ecliptic?

The ecliptic is the circular path on the celestial sphere that the sun appears to follow over the course of the year. Earth's own rotation makes the ecliptic difficult to observe.

Saturday, 30 September 2017

Understanding the Physics behind RF Equipment - From kilo Hertz to giga Hertz

Airports employ a range of RF equipment such as ILS (instrument landing systems) or MLS (microwave landing systems).  The purpose of an ILS is to enable pilots to land without visual contact of the runway. It does this by transmitting radio signals.

The development of RF equipment came out of the study of "radio science".

RF refers to e-m wave frequencies between 3 kHz to 300 GHz (giga - ten to the power nine, or a factor of a billion). 300 GHz is a really really high frequency if you think about it.

Waves in the range of 30 GHz to 300 GHz are termed extremely high frequency (EHF) waves and were first investigated in the 1890s by Jagadish Chandra Bose.

What could such EHF waves possibly be used for?  In many former USSR nations, they are used in medical treatments (known as millimeter wave (MMW) therapy).

Hertz is the SI unit denoting one cycle per second. It is named after Heinrich Rudolf Hertz, the Hamburg-born German physicist who proved electromagnetic waves exist, a notion first theorised by the Scot, James Clerk Maxwell. At one time, electromagnetic waves were termed "Hertzian waves" by scientists.