Wednesday 9 July 2014

Researchers develop efficient approach to manufacture 3D metal parts

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A cylinder is built using Selective Laser Melting (SLM) — an additive manufacturing process — and the island scanning pattern, where the region to be melted is divided into smaller islands that are scanned randomly by the laser.   Lawrence Livermore National Laboratory researchers have developed a new and more efficient approach to a challenging problem in additive manufacturing – using selective laser melting, namely, the selection of appropriate process parameters that result in parts with desired properties. Selective laser melting (SLM) is a powder-based, additive manufacturing process where a 3D part is produced, layer by layer, using a high-energy laser beam to fuse the metal powder particles. Some SLM applications require parts that are very dense, with less than 1 percent porosity, as the pores or voids are the weakest part of the material and most likely would result in failure. But building functional parts and components to specific standards and performance specifications can be challenging because a large number of parameters must be set appropriately. Some of the key parameters include laser power, laser speed, distance between laser scan lines, scanning strategy and powder layer thickness. As a result, there is a need for a reliable and cost-effective approach to determine the

The post Researchers develop efficient approach to manufacture 3D metal parts has been published on Technology Org.

 
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We finally left the village...

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We finally left the village...
...and now we're on the way to the big city?
http://www.space.com/26462-voyager-1-interstellar-space-confirmed.html?cmpid=514630_20140708_27443976   #outerspace  

 » see original post https://plus.google.com/116000959328274308893/posts/aJ3YCj7Vg46
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VIDEO: Making digital animals from old phones

Science Focus

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Digital collective Is This Good? talk to BBC News about their fascination with digital animals. 
#science 
 » see original post http://www.bbc.co.uk/news/magazine-28106467#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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Divided Supreme Court narrows EPA’s regulation of greenhouse gases

Science Focus

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Today, a divided Supreme Court gave the EPA the ability go forward with regulations that limit the emissions of greenhouse gases from most industrial sources. The ruling, however, would leave sites that emit only greenhouse gases (and not other pollutants regulated under the Clean Air Act) free from restrictions.

Six of the Court's nine members found this unsatisfying in varying ways, with four wanting to see the EPA's original plan approved. Two others hoped to see the agency's ability to regulate carbon emissions pulled entirely.

The roots of this decision date back to 2007, when the Supreme Court ruled in a case now referred to as Massachusetts v. EPA. That decision indicated that the EPA had the right to regulate greenhouse gas emissions under the Clean Air Act. It did not, however, tell the EPA how to craft those regulations, although subsequent decisions suggested the statute provided a degree of flexibility in crafting emissions limits.

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 » see original post http://feeds.arstechnica.com/~r/arstechnica/science/~3/wiYOmKoJ7t8/
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NASA Turns World Cup into Lesson in Aerodynamics

Science Focus

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Excitement is building for fans across the globe with today’s first match of the Fédération Internationale de Football Association (FIFA) 2014 World Cup tournament. These fans include NASA engineers, who used the lead-up to the tournament to test the aerodynamics of this year’s new ball design, developed by Adidas and dubbed the Brazuca ball. Although NASA is not in the business of designing or testing balls, the tournament provides an opportunity to explain the concepts of aerodynamics to students and individuals less familiar with the fundamentals of aerodynamics. “Sports provide a great opportunity to introduce the next generation of researchers to our field of aerodynamics by showing them something they can relate to,” said Rabi Mehta, chief of the Experimental Aero-Physics Branch at NASA’s Ames Research Center in Moffett Field, California. Aerodynamics is the study of how air and liquids, referred to collectively as “fluids” in aerodynamics research, flow around objects. Engineers at Ames, a world leader in fundamental aerodynamics research, possess an in-depth understanding of how fluids flow around simple three-dimensional shapes such as cylinders and spheres. With this knowledge, engineers can predict how even the minor alterations in these basic shapes change flow patterns. The previous World Cup

The post NASA Turns World Cup into Lesson in Aerodynamics has been published on Technology Org.

 
#physics 
 » see original post http://feedproxy.google.com/~r/TechnologyOrgPhysicsNews/~3/3ZyedD5Qhe0/
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Eye - Stellar Nursery R136 on nebula background Square Sticker

Here's a great sheet of stickers featuring a beautiful image from deep space


tagged with: astronomy, envelope sealers, eye, stellar nursery, r136, 30 doradus nebula, massive stars, tarantula nebula, hrbstslr dorneblmc, galaxy stars, large magellanic cloud, star cluster, amazing hubble images

Galaxies, Stars and Nebulae series On a background of the Pelican and North American nebulae, an eye made from hundreds of brilliant blue stars wreathed by warm, glowing clouds appear in this the most detailed view of the largest stellar nursery in our local galactic neighborhood. The massive, young stellar grouping, called R136, is only a few million years old and resides in the 30 Doradus (or Tarantula) Nebula, a turbulent star-birth region in the Large Magellanic Cloud (LMC), a satellite galaxy of our Milky Way.
There is no known star-forming region in our galaxy as large or as prolific as 30 Doradus. Many of the diamond-like icy blue stars are among the most massive stars known. Several of them are over 100 times more massive than our Sun. These hefty stars are destined to pop off, like a string of firecrackers, as supernovas in a few million years. The image, taken in ultraviolet, visible, and red light by Hubble's Wide Field Camera 3, spans about 100 light-years.
The movement of the LMC around the Milky Way may have triggered the massive cluster's formation in several ways. The gravitational tug of the Milky Way and the companion Small Magellanic Cloud may have compressed gas in the LMC. Also, the pressure resulting from the LMC plowing through the Milky Way's halo may have compressed gas in the satellite. The cluster is a rare, nearby example of the many super star clusters that formed in the distant, early universe, when star birth and galaxy interactions were more frequent.
The LMC is located 170,000 light-years away and is a member of the Local Group of Galaxies, which also includes the Milky Way. The Hubble observations were taken Oct. 20-27, 2009. The blue color is light from the hottest, most massive stars; the green from the glow of oxygen; and the red from fluorescing hydrogen.

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image code: dorneblmc

image credit: Hubble's Wide Field Camera 3

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Gliese 832c: The Closest Potentially Habitable Exoplanet

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Rosetta, are we there yet?

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After a 10-year journey that has clocked up more than 6 billion kilometres, ESA’s Rosetta spacecraft is rapidly closing in on its destination comet, and ESA is inviting you along for the ride.




via ESA Space Science

http://www.esa.int/Our_Activities/Space_Science/Rosetta/Rosetta_are_we_there_yet

Stellar Spire Wall Graphics

Here's a great wall decal featuring a beautiful image from deep space


tagged with: universe, space, science, astronomy, nebula, eagle nebula, stellar spire, spire

Photograph of Stellar Spire in the Eagle Nebula by NASA and ESA.

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Using Tree Tannins to Target Manure Odor

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Tannins from the quebracho tree can control the production of compounds that cause manure odors, according to studies by U.S. Department of Agriculture (USDA) scientists. This research may someday give livestock farmers options for odor control that help protect animal health and restore harmony between rural producers and nearby residents. The study was done by Agricultural Research Service (ARS) scientists in Peoria, Ill. ARS is USDA’s chief intramural scientific research agency. Hydrogen sulfide and other sulfur compounds make up about half of the offensive odorants from swine manure. Scientists have determined that a group of microbes called sulfate-reducing bacteria generate these compounds as part of the process of breaking down manure. Bacterial activity in manure pits also generates methane and nitrous oxide, which are both greenhouse gases. Research conducted by scientists elsewhere indicated that tannins-compounds naturally present in tree leaves and other feed materials-can block bacterial activity in the guts of ruminant livestock. Drawing on this research, ARS microbiologists Terry Whitehead and Mike Cotta, who work at the agency’s Bioenergy Research Unit in Peoria, conducted a laboratory study to see if quebracho tree tannins could suppress odor-generating bacterial activity in manure. The scientists incubated swine manure under laboratory conditions that mimic on-farm conditions, which allowed them to monitor gas

The post Using Tree Tannins to Target Manure Odor has been published on Technology Org.

 
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Carbon monoxide predicts 'red and dead' future of gas guzzler galaxy

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Astronomers have studied the carbon monoxide in a galaxy over 12 billion light years from Earth and discovered that it's running out of gas, quite literally, and headed for a 'red and dead' future. The galaxy, known as ALESS65, was observed by the Atacama Large Millimeter Array (ALMA) in 2011 and is one of fewer than 20 known distant galaxies to contain carbon monoxide.

via Science Daily

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NASA Mars Orbiter views rover crossing into new zone

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NASA Mars rover Curiosity has driven out of the ellipse, approximately 4 miles wide and 12 miles long (7 kilometers by 20 kilometers), that was mapped as safe terrain for its 2012 landing inside Gale Crater.

via Science Daily

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Planet Mercury a result of early hit-and-run collisions

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New simulations show that Mercury and other unusually metal-rich objects in the solar system may be relics left behind by hit-and-run collisions in the early solar system. The origin of planet Mercury has been a difficult question in planetary science because its composition is very different from that of the other terrestrial planets and the moon.

via Science Daily

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Astronomers bring the third dimension to a doomed star's outburst

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In the middle of the 19th century, the massive binary system Eta Carinae underwent an eruption that ejected at least 10 times the sun's mass and made it the second-brightest star in the sky. Now, a team of astronomers has used extensive new observations to create the first high-resolution 3-D model of the expanding cloud produced by this outburst.

via Science Daily

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Stretching forces shaped Jupiter moon's surface, laboratory model suggests

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Processes that shaped the ridges and troughs on the surface of Jupiter's icy moon Ganymede are likely similar to tectonic processes seen on Earth, according to a team of researchers. To arrive at this conclusion, the team subjected physical models made of clay to stretching forces that simulate tectonic action.

via Science Daily

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Sun sends more 'tsunami waves' to Voyager 1

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NASA's Voyager 1 spacecraft has experienced a new "tsunami wave" from the sun as it sails through interstellar space. Such waves are what led scientists to the conclusion, in the fall of 2013, that Voyager had indeed left our sun's bubble, entering a new frontier.

via Science Daily

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Something is amiss in the Universe: Cosmic accounting reveals missing light crisis

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Something is amiss in the Universe. There appears to be an enormous deficit of ultraviolet light in the cosmic budget. The vast reaches of empty space between galaxies are bridged by tendrils of hydrogen and helium, which can be used as a precise 'light meter.' In a recent study a team of scientists finds that the light from known populations of galaxies and quasars is not nearly enough to explain observations of intergalactic hydrogen. The difference is a stunning 400 percent.

via Science Daily

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A hotspot for powerful cosmic rays, most energetic particles in the universe

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An observatory found a 'hotspot' beneath the Big Dipper emitting a disproportionate number of the highest-energy cosmic rays. The discovery moves physics another step toward identifying the mysterious sources of the most energetic particles in the universe.

via Science Daily

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Orion Nebula (Hubble Telescope) Poster

Here's a great poster featuring a beautiful image from deep space


tagged with: orion nebula, milky way, nebula, star formation, stars, nasa, esa, universe, outer space, hubble telescope, hubble space telescope, hubble photograph, hubble photo, cosmos, astronomy, astronomical, cosmology, space photograph, deep space, space, nature, natural, science, advanced camera for surveys, acs, messier 42, messier 43

This Hubble photograph of the Orion Nebula is a great choice for astronomy lovers!

This is a photograph of the massive Orion Nebula, taken by the Hubble Space Telescope. The Orion Nebula is the birthplace of many new stars, and over 3000 stars are present in this image, surrounded by swirling clouds of gas and dust. The colours of the original photo have been enhanced slightly, and include rich oranges, pinks and purples.

Credit: ASA, ESA, M. Robberto ( Space Telescope Science Institute/ESA) and the Hubble Space Telescope Orion Treasury Project Team

Another view of the Orion Nebula can be found here.

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Nanotechnology: Paving the way for electronic applications

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Two-dimensional sheets of electronic materials, such as graphene, show promise for practical nanoelectronics applications, including transparent electronic circuits used in electronic displays. The formation of electrically conducting ‘nanoroads’ on atomically thin semiconductor nanosheets enables the integration of electronic components.

via Science Daily

Silicon sponge improves lithium-ion battery performance

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A sponge-like silicon material could help lithium-ion batteries run longer on a single charge by giving the batteries' electrodes the space they need to expand without breaking.

via Science Daily

The Active Cigar Galaxy - Messier 82 Square Stickers

Here's a great sheet of stickers featuring a beautiful image from deep space


tagged with: stars, galaxies, outer space, envelope sealers, agmet, galaxies and stars, hubble, chandra, messier 82, cigar galaxy, active galaxies

Galaxies, Stars and Nebulae series

Composite of images of the active galaxy Messier 82 from the three Great Observatories: Hubble Space Telescope, Chandra X-Ray Observatory, and Spitzer Space Telescope. X-ray data recorded by Chandra appears here in blue, infrared light recorded by Spitzer appears in red. Hubble's observation of hydrogen emission appears in orange. Hubble's bluest observation appears in yellow-green.

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Image code: agmet

Image credit: Hubble Space Telescope, Chandra X-Ray Observatory, Spitzer Space Telescope

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In Effort to Shift Abandoned NASA Craft, a Hiccup (or Burp)

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Attempts to correct the course of an abandoned spacecraft stumbled when thrusters failed to fire properly. Another try will be made on Wednesday.















via New York Times

Star birth in Carina Nebula from Hubble's WFC3 det Wall Skins

Here's a great wall decal featuring a beautiful image from deep space


tagged with: argo navis, astronomy, carina, celestial bodies, exploration, milky way, natural sciences, natural world, nebula, ngc 3372, nobody, outer space, physical science, sciences, space exploration and research, stars

ImageID: 42-23286264 / STScI / NASA/Corbis / Star birth in Carina Nebula from Hubble's WFC3 detector

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