Thursday, September 2, 2021

Defense News: IAI to supply remote patrol vehicles to British Army

 

IAI to supply remote patrol vehicles to British Army


The contract was awarded under a UK Ministry of Defence program to obtain unmanned vehicles capable of supporting troops and limiting their direct exposure to threats

By  Eyal Boguslavsky, Israel Defense,  30/08/2021


The IDF's Jaguar unmanned ground vehicle, made by IAI subsidiary ELTA. Photo: IDF  


Israel Aerospace Industries (IAI) has been awarded a contract by the British Ministry of Defence to deliver four remote patrol vehicles (RPVs). The Shephard Media website said that IAI won the contract together with its British partner Marlborough Communications Limited, and that the contract is part of the second spiral of the UK MoD's RPV experimentation programme.

According to the website, the new contract will support further experimentation and capability development for land operations. The aim of Spiral 2 is to deliver RPVs capable of supporting personnel and limiting their direct exposure to threats.

Israeli Robot Warrior the Jaguar!  May 5, 2021


The RPVs, designed and built by IAI’s subsidiary ELTA, are billed as "robust, versatile multi-purpose/multi-mission platforms" capable of supporting ground personnel and strengthening force protection on the battlefield, the report said.

Wednesday, September 1, 2021

An accidental discovery hints at a hidden population of cosmic objects

AUGUST 31, 2021, by Jet Propulsion Laboratory

This mosaic shows the entire sky imaged by the Wide-field Infrared Survey Explorer (WISE). Infrared light refers to wavelengths that are longer than those visible to the human eye. Many cosmic objects radiate infrared, including gas and dust clouds where stars form, and brown dwarfs. 
Credit: NASA/JPL-Caltech/UCLA

Brown dwarfs aren't quite stars and aren't quite planets, and a new study suggests there might be more of them lurking in our galaxy than scientists previously thought.

A new study offers a tantalizing explanation for how a peculiar cosmic object called WISEA J153429.75-104303.3—nicknamed "The Accident"—came to be. The Accident is a brown dwarf. Though they form like stars, these objects don't have enough mass to kickstart nuclear fusion, the process that causes stars to shine. And while brown dwarfs sometimes defy characterization, astronomers have a good grasp on their general characteristics.

Or they did, until they found this one.

The Accident got its name after being discovered by sheer luck. It slipped past normal searches because it doesn't resemble any of the just over 2,000 brown dwarfs that have been found in our galaxy so far.

As brown dwarfs age, they cool off, and their brightness in different wavelengths of light changes. It's not unlike how some metals, when heated, go from bright white to deep red as they cool. The Accident confused scientists because it was faint in some key wavelengths, suggesting it was very cold (and old), but bright in others, indicating a higher temperature.

"This object defied all our expectations," said Davy Kirkpatrick, an astrophysicist at IPAC at Caltech in Pasadena, California. He and his co-authors posit in their new study, appearing in The Astrophysical Journal Letters, that The Accident might be 10 billion to 13 billion years old—at least double the median age of other known brown dwarfs. That means it would have formed when our galaxy was much younger and had a different chemical makeup. If that's the case, there are likely many more of these ancient brown dwarfs lurking in our galactic neighborhood.

A peculiar profile

Brown dwarfs share certain characteristics with both stars and planets. Generally, they are less massive than stars and more massive than planets. A brown dwarf becomes a star if its core pressure gets high enough to start nuclear fusion, the process that causes stars to shine. 
Credit: NASA/JPL-Caltech

The Accident was first spotted by NASA's Near-Earth Object Wide-Field Infrared Survey Explorer (NEOWISE), launched in 2009 under the moniker WISE and managed by NASA's Jet Propulsion Laboratory in Southern California. Because brown dwarfs are relatively cool objects, they radiate mostly infrared light, or wavelengths longer than what the human eye can see.

To figure out how The Accident could have such seemingly contradictory properties—some suggesting it is very cold, others indicating it is much warmer—the scientists needed more information. So they observed it in additional infrared wavelengths with a ground-based telescope at the W. M. Keck Observatory in Hawaii. But the brown dwarf appeared so faint in those wavelengths, they couldn't detect it at all, apparently confirming their suggestion that it was very cold.

They next set out to determine if the dimness resulted from The Accident being farther than expected from Earth. But that wasn't the case, according to precise distance measurements by NASA's Hubble and Spitzer Space Telescopes. Having determined the object's distance—about 50 light-years from Earth—the team realized that it is moving fast—about half a million miles per hour (800,000 kph). That's much faster than all other brown dwarfs known to be at this distance from Earth, which means it has probably been careening around the galaxy for a long time, encountering massive objects that accelerate it with their gravity.

With a mound of evidence suggesting The Accident is extremely old, the researchers propose that its strange properties aren't strange at all and that they may be a clue to its age.

When the Milky Way formed about 13.6 billion years ago, it was composed almost entirely of hydrogen and helium. Other elements, like carbon, formed inside stars; when the most massive stars exploded as supernovae, they scattered the elements throughout the galaxy.

Methane, composed of hydrogen and carbon, is common in most brown dwarfs that have a temperature similar to The Accident. But The Accident's light profile suggests it contains very little methane. Like all molecules, methane absorbs specific wavelengths of light, so a methane-rich brown dwarf would be dim in those wavelengths. The Accident, by contrast, is bright in those wavelengths, which could indicate low levels of methane.

Thus, the light profile of The Accident could match that of a very old brown dwarf that formed when the galaxy was still carbon poor; very little carbon at formation means very little methane in its atmosphere today.


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SPACE - S0 - 20210901 - Sun Triggers Geomagnetic Quakes, Top Risk Zones, Space Mysteries

SPACE - S0 - 20210901 - Sun Triggers Geomagnetic Quakes, Top Risk Zones, Space Mysteries

Good Morning, 0bservers!

    
     
Solar Wind speeds dropped after 1400 UTC and stabilized, riding the 320 KPS line up to the last reporting time of 1000 UTC. Particle density continued its mild morning rise, took a minor jump for about two hours at 1400 UTC, and then stabilized again for the remainder of the period. Temperatures moved above 5200°K, again at around 1400 UTC, but started a slow decline to the 5000°K-5100°K level, dipping below that in the early hours of this morning before returning to that region. The Phi Angle was influenced a couple of times by some polarity collisions, but both it and the Bt/Bz activity seemed to return to a nominal level. KP-Index readings moved down a bit from yesterday's KP-3 highs in the early morning hours, with mostly KP-2s and KP-1s, so no evidence of geomagnetic stress there. However, NOAA is still forecasting a KP-5 (minor geomagnetic storm) at 2100 UTC followed by a possible KP-6 (moderate) before moving back to the green range. Well, we'll see. The Magnetometer again dipped to the 40 nT level around 0800 UTC for the second day in a row, but its peak was lower than the previous two. Proton Flux? Nominal. Electron Flux? Nah, not so much. It's still cresting above the alert threshold, with its last foray over the line only an hour before this writing. There were a number of repeated spikes in the X-Ray Flux chart at the upper Class B level yesterday afternoon and early evening, but it calmed for several hours before popping one out just above the Class C line at 0930 UTC. By the bye, I misjudged the rotational speed of that coronal hole yesterday. Wasn't expecting it to start its transit across the midpoint until this afternoon at the earliest, but the video loops show that happening now. The Class B spikes I mentioned earlier seem to be coming from both the old and departing Southwest sunspot group, and a newer one crossing the Northeast lim. You can also see some prominences and a small filament release at the Southwest lim ahead of the sunspot. Too soon to see the Class C eruption, but you'll have your best chance later this morning at 304Å and 131Å. The Magnetogram shows some lessening of complexity in the departing sunspot group, and the new one incoming looks to be Beta to Beta-Delta at this point and is far smaller. 
  
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Roman Ships ramming Carthaginian Ships

Discovery of four ancient 450lb battering rams shed new light on how Rome took command of the Mediterranean 2,000 years ago by smashing through Carthage's ships

  • The ancient artefacts were recovered from the waters to the east of Sicily 
  • The rams would have been used in the Battle of the Aegates in March 241 BC 
  • Roman vessels surprised and outmanoeuvred the cargo-laden Carthaginian fleet
  • They sunk 50 enemy vessels and captured 70 more, ending the First Punic War
  • Following this, Carthage sued for peace and surrendered Sicily to the Romans

Four ancient bronze battering rams — each weighing a colossal 450lbs —  have been recovered from Roman wrecks that sunk off the coast of Sicily in 241 BC.

Originally attached to the bows of warships, the rams were used against the Carthaginian fleet during the Battle of the Aegates that ended the First Punic War.

Fought in the waters around Sicily and North Africa, this conflict between the Phoenicians and the Romans lasted 23 years — the longest naval war of antiquity. 

Each once-gleaming ram boasts three blades on each side which would have been used to try to splinter the wooden hulls of enemy vessels.

Damage seen on some of the rams suggest that ships went head-to-head in collisions the team said must have been 'very violent'.

Accounts suggest that the Romans succeeded in sinking 50 Carthaginian ships.

The rams have not been the only underwater finds from the area this summer — with the wrecks of three merchant vessels, all loaded with ceramic jars, also found. 

The archaeological efforts have been led by the Sicilian Marine Archaeology Unit, in tandem with the US non-profit the RPM Nautical Foundation.

Four ancient bronze battering rams — each weighing a colossal 450lbs — have been recovered from Roman wrecks that sunk off the coast of Sicily in 241 BC. Pictured: one of the battering rams, which would once have adorned the bow of a Roman warship

Four ancient bronze battering rams — each weighing a colossal 450lbs — have been recovered from Roman wrecks that sunk off the coast of Sicily in 241 BC. Pictured: one of the battering rams, which would once have adorned the bow of a Roman warship

Originally attached to the bows of warships called  triremes (pictured in this artist's impression), the rams were used against the Carthaginian fleet during the Battle of the Aegates that ended the First Punic War

'Carthaginian rams we have found have inscriptions to the god Baal on them and are less well made than the Roman rams,' Sicily's Marine Archaeology Unit's Valeria Livigni told the Times

'Carthaginian rams we have found have inscriptions to the god Baal on them and are less well made than the Roman rams,' Sicily's Marine Archaeology Unit's Valeria Livigni told the Times

THE FIRST PUNIC WAR 

The First Punic War was the first of three wars fought between the Phoenicians of Carthage and Rome in the early third century BC.

The longest naval war of antiquity, the conflict raged from 264–241 BC in the waters around Sicily and North Africa.

It began when Roman forces gained a foothold on Sicily and, allied with the people of Syracuse, laid siege to the Carthaginian's main base on the island, that of Akragas. 

Following this, Rome built a navy to rival that of the Phoenicians' and, after a series of minor victories, launched an invasion of North Africa which was intercercepted at the Battle of Cape Ecnomus — in what many consider, by the number of combatants, to be the largest naval battle of all time.

Beaten, Carthage sued for peace, but fought on after rejecting the Roman's harsh terms for such.

After several years of effective stalemate, the Roman forces deployed a successful blockade of the garrisons at Drepana and Lilybaeum.

Carthage dispatched a fleet in 241 BC to relieve their outposts, but this was intercepted and bested at the Battle of the Aegates — in which the nimble Roman vessels deployed battering rams against their opponents to devastating effect. 

In the wake of the battle, Carthage sued for peace, ultimately surrendering Sicily to Roman control. 

According to the Greek Historians Polybius and Diodorus of Sicily, the Battle of the Aegates was held in the waters around the Aegadian Islands on March 10, 241 BC.

The Carthaginian fleet was led by Hanno, son of Hannibal, who had previously provided support to the military commander Hannibal Gisco during the Roman siege of Agrigentum, on the southern Sicilian coastline, in 262 BC.

Whether Hanno was the son of Hannibal Gisco is unclear — the Punic [Western Phoenician] nobles used a remarkably limited repertoire of around 10 first names. In fact, accounts list at least three Hannibals and five Hannos in the Punic wars.

The Roman forces, meanwhile, were commanded by the Praetor Quintus Valerius Falto — stepping in for his superior, Gaius Lutatius Catulus, who had been injured in the siege of Drepana (known today as Trapani), which from from 249–241 BC.

Following Catulus' intensification of the siege, the Carthaginians were forced to send a fleet to support the town — and it was this that the recently-bolstered Roman navy intercepted and defeated at the Battle of the Aegates.

The site of the battle was identified back in 2010 by the Italian archaeologist Sebastiano Tusa, after a local fisherman recovered a battering ram from the conflict and presented it to a Sicilian dentist. Since then, 25 more rams have been recovered.

Accounts suggest that the Romans sunk 50 Carthaginian vessels and captured 70 more, although at the cost of 30 of their own ships and damage to 50 more.

It is thought that the fleets of both sides originally numbered some 200 vessels. 

Victory in the battle is credit to the greater manoeuvrability of the Roman ships, which enabled them to ram their opponent's vessels. 

'We believed that ships tried to ram each other broadside,' RPM Nautical Foundation's David Ruff told the Times.

'But many of the rams we have discovered are damaged, suggesting they went head to head. Either way, these were very violent collisions.'

It is believed that the Romans jettisoned their masts and anchors in order to make their ships — which could be rowed with oars — lighter before engaging the Carthaginian fleet. Certainly, Professor Tusa recovered anchors from the seabed.

In contrast, the Carthaginian vessels were laden down with supplies that they had intended to offload at the sieged ports of Drepana and Lilybaeum (today known as Marsala) prior to engaging the Roman fleet. 

They were also poorly manned, having similarly been unable to pick up the complement of marines from Sicily as had also been planned.  

Evidence also suggests that the Romans might have been a little more disciplined when it came to the construction of their maritime weaponry.

'Carthaginian rams we have found have inscriptions to the god Baal on them and are less well made than the Roman rams,' the head of Sicily's Marine Archaeology Unit, Valeria Livigni, told the Times.

The Roman weapons, she explained, 'have an inscription by a judge to verify that they had been made according to the rules and met standards.'

Each once-gleaming ram boast three blades on each side which would have been used to try to splinter the wooden hulls of enemy vessels. Pictured: a ram is hauled up from the sea floor

Each once-gleaming ram boast three blades on each side which would have been used to try to splinter the wooden hulls of enemy vessels. Pictured: a ram is hauled up from the sea floor

Fought in the waters around Sicily and North Africa, the First Punic War between the Phoenicians and the Romans lasted 23 years — the longest naval war of antiquity. Pictured: a model of a Roman trireme as seen on display in the naval museum of Chania on Crete

Fought in the waters around Sicily and North Africa, the First Punic War between the Phoenicians and the Romans lasted 23 years — the longest naval war of antiquity. Pictured: a model of a Roman trireme as seen on display in the naval museum of Chania on Crete

During the Battle of the Aegates, the Romans reportedly sunk 50 Carthaginian vessels and captured 70 more, although at the cost of 30 of their own ships and damage to 50 more. Pictured: the Roman victory is alluded to in this coin dated from 109 BC — it depicts a Roman vessel surrounded by a wreath of oak leaves

During the Battle of the Aegates, the Romans reportedly sunk 50 Carthaginian vessels and captured 70 more, although at the cost of 30 of their own ships and damage to 50 more. Pictured: the Roman victory is alluded to in this coin dated from 109 BC — it depicts a Roman vessel surrounded by a wreath of oak leaves

'We believed that ships tried to ram each other broadside,' RPM Nautical Foundation's David Ruff told the Times. Pictured: one of the rams recovered from the sea floor

'We believed that ships tried to ram each other broadside,' RPM Nautical Foundation's David Ruff told the Times. Pictured: one of the rams recovered from the sea floor

The remainder of the Carthaginian fleet succeeded in fleeing thanks to a change in wind — one the Romans, having left behind their masts, sails and rigging, were unable to similarly exploit. On arrival at Carthage, Hanno was crucified for his failure.

In the wake of the battle, Carthage sued for peace, as part of which it surrendered Sicily to Roman control — alongside paying substantial reparations — as was agreed under the so-called Treaty of Lutatius.

According to Dr Livigni, the three merchant vessels that their expedition has brought to light were found among the Aegadian Islands, near the island of Ustica and off the coast of Isola delle Femmine.

'They were loaded with amphoras [storage jars],' she added.

'One off the [Aegadian Islands] had more than 200 on board, still piled up — including some that contained traces of wine.' 

'Many of the rams we have discovered are damaged, suggesting they went head to head. Either way, these were very violent collisions,' Mr Ruff added

'Many of the rams we have discovered are damaged, suggesting they went head to head. Either way, these were very violent collisions,' Mr Ruff added

According to Dr Livigni, the three merchant vessels that the expedition brought to light alongside the battering rams were found among the Aegadian Islands (also the site of the Battle of the Aegates), near the island of Ustica and off the coast of Isola delle Femmine

According to Dr Livigni, the three merchant vessels that the expedition brought to light alongside the battering rams were found among the Aegadian Islands (also the site of the Battle of the Aegates), near the island of Ustica and off the coast of Isola delle Femmine

THE CARTHAGINANS 

Pictured: the location of Cartage, with the extent of the Carthaginian Empire in blue

Pictured: the location of Cartage, with the extent of the Carthaginian Empire in blue

Ancient Carthage was a Phoenician civilisation centred around Carthage, on the Gulf of Tunis, which founded by colonists from Tyre in 814 BC.

At its height during the fourth century BC, the city-state became the largest metropolis in world, with an empire that dominated the western Mediterranean. 

It had a mercantile network that extended from north Europe down to west Africa and across to west Asia.

Far less is known about Carthage's peoples than those of ancient Rome or Greece, as most indigenous records were destroyed — along with the city — following the Third Punic War in 146 BC.

Their victory in this conflict paved the way for the Roman civilisation to become the dominant power in the Mediterranean.