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New Method for Rendering Particles Outlined

Tomb Raider: Anniversary coder Mike Krazanowski has outlined a new method for rendering particles using pixel shaders and a little bit of math. "Although this method has been employed in games for many years, this article defines a method using shader technology to more physically represent these volumetric particles. This method will give a more accurate visual representation of the simulated volumes as well as potentially decreasing the necessary number of particles, which in turn will help to improve render performance. It should first be stated that the method defined in this article is limited to particles that represent volumes of sub-particles. It is also noted that the analysis that is to follow assumes a uniform density of the particles.

Nanotech Wages War on Infections

Made of pure silver, these particles measure about 10 nm in diameter. We manufacture them in a proprietary solution and then treat the devices we coat in the same solution. SilvaGard-treated surfaces can provide for a programmable duration of antimicrobial efficacy — lasting days, weeks or months. Our patent-pending process basically grows nanotech particles on the surface of medical devices. SilvaGard particles tightly adhere to these surfaces, requiring no intermediate binder layer. Nor do these particles change the mechanical or physical properties of the device to which they are applied.

Nanotech Wages War on Infections

What is the makeup of your infection-fighting nanomaterial, SilvaGard? Made of pure silver, these particles measure about 10 nm in diameter. We manufacture them in a proprietary solution and then treat the devices we coat in the same solution. SilvaGard-treated surfaces can provide for a programmable duration of antimicrobial efficacy %u2014 lasting days, weeks or months. Our patent-pending process basically grows nanotech particles on the surface of medical devices. SilvaGard particles tightly adhere to these surfaces, requiring no intermediate binder layer. Nor do these particles change the mechanical or physical properties of the device to which they are applied. Why was this new material developed? We started our company about 15 years ago, developing wound-care products, such as gels and dressings that incorporate the antimicrobial p

National study examines health risks of coarse particle pollution

Researchers at the Johns Hopkins Bloomberg School of Public Health have conducted the largest nationwide study on the acute health effects of coarse particle pollution. Coarse particles are airborne pollutants that fall between 2.5 and 10 microns in diameter. These particles are larger than fine particles (less than 2.5 microns) and are produced by processes such as mechanical grinding, windblown dust and agriculture. These particles are of interest from both public health and regulatory perspectives.

Particles Retain Weight for Billions of Years

Unlike most of us, subatomic particles don't gain weight as they get older. The mass of these tiny bits of matter has remained constant over the last 6 billion years, recent astronomical observations indicate.

Light-Emitting Particles Yield Faster Computing

schliz writes to tell us that researchers at the University of California San Diego are developing new transistors based on particles called 'excitons' in an attempt to speed up the interaction between computing and communications signals. "Excitons are formed by linking a negatively-charged electron with a positively-charged 'hole'. An exciton decays when the electron and hole combine, emitting a flash of light in the process. By joining exciton-based transistors to form several types of switches, the UCSD physicists were able to achieve switching times on the order of 200 picoseconds."

Scientists map previously undetected particles from edge of solar system

Washington, July 3 : Scientists have mapped the energized particles where the hot solar wind slams into the cold interstellar medium, which were undetected till now, using images captured by NASA's sun-focused Solar Terrestrial Relations Observatory (STEREO) twin spacecraft.

Cancer warning over nano particles

Which? is calling for better regulation of nanotechnology after scientists warned certain tiny particles could pose a health risk similar to asbestos.

Satellite to Shed Light on How Clouds, Particles Warm Earth

BELTSVILLE, Md. _ NASA plans to launch a new satellite next year that will help scientists fill in a gap in their understanding of global warming: the role of clouds and airborne particles.

STEREO Shows Solar System's Invisible Frontier

NASA's sun-focused STEREO spacecraft unexpectedly detected particles from the edge of the solar system last year, allowing University of California, Berkeley, scientists to map for the first time the energized particles in the region where the hot solar wind slams into the cold interstellar medium.

First images of solar system's invisible frontier

NASA's sun-focused STEREO spacecraft unexpectedly detected particles from the edge of the solar system last year, allowing University of California, Berkeley, scientists to map for the first time the energized particles in the region where the hot solar wind slams into the cold interstellar medium.

STEREO craft examine solar system's invisible frontier

BERKELEY -- NASA's sun-focused STEREO spacecraft unexpectedly detected particles from the edge of the solar system last year, allowing University of California, Berkeley, scientists to map for the first time the energized particles in the region where the hot solar wind slams into the cold interstellar medium.

NASA Delivers First Images of Solar System's Invisible Frontier

Sensors onboard the space agency's Solar Terrestrial Relations Observatory spacecraft detected particles from the edge of the solar system. The new data has helped scientists map the energized particles where the hot solar wind meets the cold interstellar medium.

Jupiter's Rings Made in the ShadeWhat Mars Fossils Might Look Like

An eclipse of the sun by Jupiter, as viewed from Galileo, reveals the rings. Small dust particles high in Jupiter's atmosphere, as well as the dust particles that compose the rings, can be seen by reflected sunlight. Credit: NASA, JPL, Galileo Project, (NOAO), J. Burns (Cornell) et al.

Closest Images Ever of Mars Dust Grains

The Phoenix science team tested out the lander's Optical Microscope by imaging grains of sand and dust particles, some as small as one-tenth the diameter of a human hair. These are the highest resolution image ever of small soil particles from another planet. "We have images showing the diversity of mineralogy on Mars at a scale that is unprecedented in planetary exploration," said Michael Hecht of NASA's Jet Propulsion Laboratory.

Closest Images Ever of Mars Dust Grains

June 6, 2008 - The Phoenix science team tested out the lander's Optical Microscope by imaging grains of sand and dust particles, some as small as one-tenth the diameter of a human hair. These are the highest resolution image ever of small soil particles from another planet

Looking for Black Holes in ... Water?

Looking for Hawking Radiation in space is likely impossible with our current technology. But scientists here on Earth recently used flowing water to simulate a black hole and create event horizons, testing Stephen Hawking's famous prediction that the event horizon creates particles and anti-particles.

Brown University opens nanotechnology center

Hoping to advance nanotechnology, Brown University [profile] in Providence, R.I., has established a new research center, the Institute for Molecular and Nanoscale Innovation. Last week, Brown launched the institute with a three-day nanoscience forum. The institute studies particles so small that they can be viewed only with an electron microscope, said Robert Hurt, the institute's director and a professor in Brown's division of engineering. The careful analysis, manipulation and control of the tiny particles can have practical results. For example, most sunscreen lotions used to be white, like cream, to block the sun's rays.

Nanotechnology zippers for membranes

(Nanowerk Spotlight) Nanotechnology researchers have appropriated the name of Janus - the Roman god of gates and doorways, usually depicted with two heads looking in opposite directions - to name a class of amphiphilic (i.e. containing both hydrophobic and hydrophilic portions) nanoparticles composed of two fused hemispheres, each made from a different substance. Their particular structure makes Janus particles an intriguing subject for exploring novel anti-cancer therapies where they, for instance, carry two different and complementary medicines. In a novel use of Janus particles, researchers have now isolated a means of using them to make 're-sealable' pores in lipid bilayer membranes. Described in another way, the localization of the nanoparticles in the pore can be thought of as the placement of a zipper, which allows a specific slit

Nanotechnology straws - capillary action at the nanoscale

(Nanowerk Spotlight) Various techniques are being developed to enhance the already impressive properties of carbon nanotubes (CNTs) further by combining them with other materials. We have covered plenty of examples in our Spotlights. For instance, encapsulating carbon nanofibers with CNTs transforms cheap commercial carbon nanotubes into highly efficient carbon for electrochemical energy storage applications (Converting conventional nanotubes into superior carbon for batteries). Another study demonstrated that the redox properties of iron and iron oxide particles are tunable via encapsulation within CNTs, suggesting that a host-guest interaction between the confined metal particles and CNTs, which is different from that on the outside of the nanotubes (see: Ethanol production inside carbon nanotubes).

Large Hadron Collider Could Generate Dark Matter

One of the biggest questions that occupy particle physicists and cosmologists alike is: what is dark matter? We know that a tiny fraction of the mass of the universe is the visible stuff we can see, but 23% of the Universe is made from stuff that we cannot see. The remaining mass is held in something called dark energy. But going back to the dark matter question, cosmologists believe their observations indicate the presence of dark matter, and particle physicists believe the bulk of this matter could be held in quantum particles. This trail leads to the Large Hadron Collider (LHC) where the very small meets the very big, hopefully explaining what particles could be generated after harnessing the huge energies possible with the LHC…

Particles retain weight for billions of years

An artist's representation of radio waves from a distant quasar, called B0218+367 (seen far right). On their way to Earth, these waves pass through a spiral galaxy containing ammonia gas, which absorbs a portion of the radio emission. Credit: N. Junkes; A. Biggs; NASA; ESA; STScI; W. Keel; E. Beckwith

Particles Detect Cancer

PROVIDENCE, R.I., May 27, 2008 -- The smallest magnetic nanoparticles created to date can be sent on such seek-and-find missions for tumor cells and emit signals MRI scans can detect.

Waves, Particles, and Medicine in Houston: 50th AAPM Meeting, July 27 to July 31

X-RAYS, CT SCANS, SOUND WAVES FOR ULTRASOUND, MAGNETIC FIELDS, MRI, MEDICINE, MODERN MEDICAL PHYSICS, IMAGING THE HUMAN BODY, TREATMENT, CANCER, DISEASES

Waves, Particles, and Medicine in Houston: 50th AAPM Meeting, July 27 to July 31

Newswise - Later this month, thousands of scientists and health professionals from the field of medical physics will meet at the 50th meeting of the American Association of Physicists in Medicine (AAPM) in Houston, Texas. There, from July 27 to July 31, they will present the latest technologies for imaging and treating diseases and discuss the ethical and regulatory issues facing the field today.

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