The Hellenic Navy (HN) (Greek: Πολεμικό Ναυτικό, Polemikó Naftikó, abbreviated ΠΝ) is the naval force of Greece, part of the Greek Armed Forces. The modern Greek navy has its roots in the naval forces of various Aegean Islands, which fought in the Greek War of Independence. During the periods of monarchy (1833–1924 and 1936–1973) it was known as the Royal Navy (Βασιλικόν Ναυτικόν, Vasilikón Naftikón, abbreviated ΒΝ).The total displacement of all the navy's vessels is approximately 150,000 tons.The motto of the Hellenic Navy is "Μέγα το της Θαλάσσης Κράτος" from Thucydides' account of Pericles' oration on the eve of the Peloponnesian War. This has been roughly translated as "Great is the country that controls the sea". The Hellenic Navy's emblem consists of an anchor in front of a crossed Christian cross and trident, with the cross symbolizing Greek Orthodoxy, and the trident symbolizing Poseidon, the god of the sea in Greek mythology. Pericles' words are written across the top of the emblem. "The navy, as it represents a necessary weapon for Greece, should only be created for war and aim to victory."...............The Hellenic Merchant Marine refers to the Merchant Marine of Greece, engaged in commerce and transportation of goods and services universally. It consists of the merchant vessels owned by Greek civilians, flying either the Greek flag or a flag of convenience. Greece is a maritime nation by tradition, as shipping is arguably the oldest form of occupation of the Greeks and a key element of Greek economic activity since the ancient times. Nowadays, Greece has the largest merchant fleet in the world, which is the second largest contributor to the national economy after tourism and forms the backbone of world shipping. The Greek fleet flies a variety of flags, however some Greek shipowners gradually return to Greece following the changes to the legislative framework governing their operations and the improvement of infrastructure.

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This is a bilingual blog in English and / or Greek and you can translate any post to any language by pressing on the appropriate flag....Note that there is provided below a scrolling text with the 30 recent posts...Αυτό είναι ένα δίγλωσσο blog στα Αγγλικά η/και στα Ελληνικά και μπορείτε να μεταφράσετε οποιοδήποτε ποστ σε οποιαδήποτε γλώσσα κάνοντας κλικ στη σχετική σημαία. Σημειωτέον ότι παρακάτω παρέχεται και ένα κινούμενο κείμενο με τα 30 πρόσφατα ποστς....This is a bilingual blog in English and / or Greek and you can translate any post to any language by pressing on the appropriate flag....Note that there is provided below a scrolling text with the 30 recent posts...Αυτό είναι ένα δίγλωσσο blog στα Αγγλικά η/και στα Ελληνικά και μπορείτε να μεταφράσετε οποιοδήποτε ποστ σε οποιαδήποτε γλώσσα κάνοντας κλικ στη σχετική σημαία. Σημειωτέον ότι παρακάτω παρέχεται και ένα κινούμενο κείμενο με τα 30 πρόσφατα ποστς.........

Saturday, December 20, 2014

First 3-D printer in space..[ 5045 ]

Twist and shout: NASA prints 3-D wrench in space

By Sarah LeTrent, CNN

December 19, 2014 -- Updated 2229 GMT (0629 HKT) |

(CNN) -- Bringing supplies to astronauts on the International Space Station can be a little screwy, leaving astronauts waiting for the next costly and risky resupply mission.
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This week, thanks to 3-D printing, astronaut and ISS commander Barry "Butch" Wilmore had a wrench he needed manufactured by a printer in just four hours.

The ratcheting socket wrench was the first "uplink tool" printed in space, according to Grant Lowery, marketing and communications manager for Made In Space, which built the printer in partnership with NASA. The tool was designed on the ground, emailed to the space station and then manufactured.

From start to finish, the process took less than a week.

Made in Space's 3-D printer is the first to operate in zero gravity, and printed its first object in orbit -- a part for the printer, ironically -- in November.

Astronaut Barry "Butch" Wilmore holds up the ratchet after removing it from the print tray.

Astronaut Barry "Butch" Wilmore holds up the ratchet after removing it from the print tray.

"This means that we could go from having a part designed on the ground to printed in orbit within an hour to two from start to finish," Niki Werkheiser, NASA's 3-D print manager, said in a press release when the printer was sent to the ISS in September. "The on-demand capability can revolutionize the constrained supply chain model we are limited to today and will be critical for exploration missions."

The goal for the project is to create in-space manufacturing, especially as missions venture farther from Earth.

Space, the final frontier for 3-D printing

Ultimately, Lowery said the wrench and other objects will be sent back to assess whether there are any functional differences between those samples printed in space versus those on the ground.

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