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BerichtGeplaatst: 12-09-2018 10:24:03    Onderwerp: defeated the al-Qaid Reageren met citaat
Lightweight composite metal foams could prove to make all the difference when it comes to x-ray and gamma ray shieldingand neutron radiation protectionas they can absorb the energy created during high-impact collisions T.J. Yeldon Jersey , says study. This study was published in the Radiation Physics and Chemistry Journal and was authored by researchers from NC State. The work was also supported by the Nuclear Energy University Program grant offered by DOE’s Office of Nuclear Energy.

“There’s an opportunity to use composite metal foam to develop safer systems for transporting nuclear waste, more efficient designs for spacecraft and nuclear structures, and new shielding for use in CT scanners,” says AfsanehRabiei, one of the authors of this study, professor of aerospace engineering at NC State. This means that metal foams could be extremely useful for space exploration applications, medical technology and nuclear safety.

This lightweight metal foam was first built to be used in military and transportation applications, but the authors also wanted to determine whether it could be helpful in space exploration applications and nuclear radiationprotection, and to examine whether this metal foam could protect against high impact, offer structural support and provide radiation shielding against different types of radiation.

To examine its use, the study conducted several tests to examine the foam’s effectiveness at gamma ray shielding, x-ray shielding and radiation protection. This was then compared to the performance of materials that are currently being used in all kinds of shielding applications. The comparison proved that while each sample had the same weight, it varied in terms of volume.

A composite material known as high-Z steel-steel was found to be the most effective in offering protection against all three forms of radiation. This metal is mostly comprises of stainless steel, but it also contains small quantities of tungsten. The major difference is that its structure was modified so that the composite foam which included tungsten wasn’t denser than metal foams made using stainless steel only.

The shielding performance of this new material was then tested against different types of gamma rays as gamma rays can have different energies depending on the source material. For example, barium emits low energy gamma rays while cobalt or cesium emits higher-energy rays.

The study went on to show that high-Z steel-steelfoam was on par with most bulk materials at blocking high-energy gamma rays, but it was far better than most, including bulk steel, in blocking out low-energy gamma rays. The material also outshone others when it came to neutron radiation protection and x-ray shielding.

This foam is non-toxic which makes it easy to recycle and manufacture. It can also act as a viable candidate for nuclear structural applications because of its thermal and mechanical properties, and its capability to absorb energy. Researchers are now working on modifying the composition of this metal foam to make it a more effective shield against x-rays. Rabiei says that early results are extremely promising.

DAMASCUS, Aug. 21 (Xinhua) -- The Syrian army and allied troops backed by Russian air force are so close to lay the largest siege on the Islamic State (IS) militants in the Syrian desert in the remote eastern countryside of Homs province, a military source told Xinhua and activists said.


After recently capturing Al-Sukhnah city in eastern Homs from IS, the Syrian army was moving from another direction to form a circle around IS.


On Sunday, the Syrian army captured the town of Taibeh, north of Al-Sukhnah, becoming only 15 km to impose a full siege on around 9,000 sq km of IS-controlled terrain in the Syrian desert, the source told Xinhua on condition of anonymity.


The troops in Al-Sukhnah are advancing north of the city to meet with the troops who are closing in from Taibeh, said the source, adding that when the troops meet, the largest siege against IS will be in place.


So far, the IS militants have started fleeing through the remaining 15 km between Al-Sukhnah and Taibeh toward Deir al-Zour province in eastern Syria and the southern countryside of Hasakah province.


The months-long military operations in the Syrian desert by the Syrian army and allied fighters aimed to clear the desert from IS presence and to reach the administrative borders of Deir al-Zour to break the years-long IS siege on the city and the military forces trapped inside.


The operation is moving in that direction and breaking Deir al-Zour siege is now a priority for the Syrian army, the source told Xinhua.


In the south, near the capital Damascus, the Syrian army and the Lebanese Hezbollah group are fighting another battle against IS to clear the western Qalamoun region near Lebanon from the terror-designated group.


The source told Xinhua that the army and Hezbollah have captured key hilltops and heights, which will make it easy for the advancing troops to clear that area from IS, just a couple of weeks after the military forces and the Lebanese Shiite group defeated the al-Qaida-linked Nusra Front in the Qalamoun region.


Meanwhile, local media reported the falling of civilian victims as a result of the U.S.-led airstrikes on IS-held areas in the city of Raqqa, the de facto capital of the terror-labeled group.


At least 40 civilians have been killed over the past 24 hours by U.S.-led airstrikes on a building in Raqqa city, activists said, adding that all of the bodies are still under the rubble.


In Hasakah, at least 20 civilians were killed a day earlier when U.S.-led airstrikes heavily pounded areas in the eastern countryside of Hasakah, namely in the town of Jasa', activists said.


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