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An introduction to minerals and rocks under the microscope
Science, Maths & Technology

An introduction to minerals and rocks under the microscope

...composition (e.g. SiO2) is cooled very rapidly it will produce a silica glass, whereas if it were cooled slowly it would produce a crystalline solid composed of quartz crystals. It is important to note that compared with crystalline solids, glass is not a particularly stable form of matter. Over many years, glass may slowly convert into a crystalline form in a process...
View course An introduction to minerals and rocks under the microscope
Level 2: Intermediate 8 hrs
Osprey process
Science, Maths & Technology

Osprey process

...compositions and rapidly solidified materials. Alloy steels and stainless steels are preformed on the Osprey Process. Cu-10%Sn bronze preforms with grain sizes of <0.0015 mm can be hot worked without cracking. Heat treatment times for homogenisation are substantially reduced. High temperature nickel- and cobalt-based superalloy aero-engine components are difficult to...
View article Osprey process
Article 5 mins
Direct metal deposition (DMD)
Science, Maths & Technology

Direct metal deposition (DMD)

...composition. Development is popular with high cost materials due to the reduction in wastage compared to subtractive manufacturing. Materials such as (limitations in brackets): Nickel-based super alloys (rapid cooling rates limit the extent to which precipitates can form, limiting the possible strength without post thermal treatments). Titanium alloys (limited by...
View article Direct metal deposition (DMD)
Article 10 mins
Selective laser melting (SLM)
Science, Maths & Technology

Selective laser melting (SLM)

...composition. Development is popular with high-cost materials due to the reduction in wastage compared to subtractive manufacturing. Materials such as (limitations in brackets): Nickel-based super alloys (rapid cooling rates limit the extent to which precipitates can form, limiting the possible strength without post-thermal treatments). Titanium alloys (high gas solubility...
View article Selective laser melting (SLM)
Article 10 mins
The ocean of Jupiter’s moon Europa
Science, Maths & Technology

The ocean of Jupiter’s moon Europa

...composition by mimicking these water-rock interactions using computer modelling or laboratory simulation experiments. For example, researchers in AstrobiologyOU have used geochemical modelling to investigate what might happen when rocks of a similar composition to those on the europan seafloor react with fluids from different sources, such as cometary ice and water...
View article The ocean of Jupiter’s moon Europa
Article 5 mins
A new mission to the icy moons of Jupiter
Science, Maths & Technology

A new mission to the icy moons of Jupiter

...composition of the ocean water – to simulate the chemical reactions that might be occurring there. Up to now, I’ve mainly looked at reactions involving inorganic compounds – metals and carbonates – and now I’m moving on to look at organic (compounds that contain carbon) materials. The Cassini mission in 2008 detected some very simple organic compounds on...
View article A new mission to the icy moons of Jupiter
Article 5 mins
Nos Galan Gaeaf: y dathliad Cymreig traddodiadol sy’n cael ei fwrw i’r cysgod gan ddathliadau Halloween modern
History & The Arts

Nos Galan Gaeaf: y dathliad Cymreig traddodiadol sy’n cael ei fwrw i’r cysgod gan ddathliadau Halloween modern

...du a gwyn o benglog dafad ar wal gerrig ] Bydd plant ym mhob cwr o Gymru wedi’u gwisgo fel gwrachod neu ysbrydion ar Hydref 31, yn mynd o ddrws i ddrws, gan weiddi “cast ynteu ceiniog”/“trick or treat”, yn y gobaith o dderbyn losin. Mewn geiriau eraill, bydd yr olygfa’n debyg iawn i honno a welir ar adeg Halloween yng ngweddill y DU. Ar bosteri sy’n...
View article Nos Galan Gaeaf: y dathliad Cymreig traddodiadol sy’n cael ei fwrw i’r cysgod gan ddathliadau Halloween modern
Article 5 mins
Codi ymwybyddiaeth a chymorth i ddynion
Health, Sports & Psychology

Codi ymwybyddiaeth a chymorth i ddynion

...du wrth ochr ei gilydd.] Mae dynion deirgwaith yn fwy tebygol na menywod o farw trwy hunanladdiad. Dynion 40 i 49 oed sydd â’r gyfradd hunanladdiad uchaf yn y DU. Mae dynion yn llai tebygol o geisio cymorth megis therapïau seicolegol o gymharu â menywod. Mae dynion yn llawer mwy tebygol o fynd ar goll, cysgu ar y stryd, a dod yn ddibynnol ar alcohol a chyffuriau. Er...
View article Codi ymwybyddiaeth a chymorth i ddynion
Article 5 mins