ScienceDaily: Top Technology News |
- Technique to control light from nanoparticles
- Space telescopes reveal secrets of turbulent black hole
- Orbital observations of Mercury reveal flood lavas, hollows, and unprecedented surface details
- Scientists release most accurate simulation of the universe to date
- Scientists and engineers create the 'perfect plastic'
- Building better catalysts
- NASA space telescope finds fewer asteroids near Earth
- Pressurized vascular systems for self-healing materials
- Hydrogen released to fuel cell more quickly when stored in metal nanoparticles
- Redefining the kilogram and the ampere
- Stardust discovered in far-off planetary systems
- World's first energy-storage membrane devised
| Technique to control light from nanoparticles Posted: 29 Sep 2011 01:13 PM PDT Chemists have discovered a way to use liquid crystals to control light scattered from gold nanorods. The researchers use voltage to sensitively manipulate the alignment of liquid crystal molecules that alternately block and reveal light from the particles; the gold nanorods collect and retransmit light in a specific direction.  |
| Space telescopes reveal secrets of turbulent black hole Posted: 29 Sep 2011 12:53 PM PDT Supermassive black holes at the hearts of active galaxies swallow large amounts of gas. During this feast they spill a lot of their 'food', which is discharged in turbulent outbursts. An international team of astronomers has revealed some striking features of such an outburst around a supermassive black hole in a distant galaxy. They found a very hot 'convertor' corona hovering above the black hole and cold gas 'bullets' in hotter diffuse gas, speeding outwards with velocities up to 700 km/s.  |
| Orbital observations of Mercury reveal flood lavas, hollows, and unprecedented surface details Posted: 29 Sep 2011 12:09 PM PDT After only six months in orbit around Mercury, NASA's MESSENGER spacecraft is sending back information that has revolutionized the way scientists think about the innermost planet. Analyses of new data from the spacecraft show, among other things, new evidence that flood volcanism has been widespread on Mercury, the first close-up views of Mercury's "hollows," the first direct measurements of the chemical composition of Mercury's surface, and the first global inventory of plasma ions within Mercury's space environment.  |
| Scientists release most accurate simulation of the universe to date Posted: 29 Sep 2011 11:46 AM PDT The Bolshoi supercomputer simulation, the most accurate and detailed large cosmological simulation run to date, gives physicists and astronomers a powerful new tool for understanding such cosmic mysteries as galaxy formation, dark matter, and dark energy.  |
| Scientists and engineers create the 'perfect plastic' Posted: 29 Sep 2011 11:46 AM PDT Researchers have solved a long-standing problem that could revolutionize the way new plastics are developed.  |
| Posted: 29 Sep 2011 11:46 AM PDT Chemists have developed a method to design and test new catalysts, which are substances that speed chemical reactions and are crucial for producing energy, chemicals and industrial products. By using the new method, the chemists also made a discovery that will make it easier to design future catalysts.  |
| NASA space telescope finds fewer asteroids near Earth Posted: 29 Sep 2011 10:50 AM PDT New observations by NASA's Wide-field Infrared Survey Explorer, or WISE, show there are significantly fewer near-Earth asteroids in the mid-size range than previously thought. The findings also indicate NASA has found more than 90 percent of the largest near-Earth asteroids, meeting a goal agreed to with Congress in 1998.  |
| Pressurized vascular systems for self-healing materials Posted: 29 Sep 2011 09:29 AM PDT Artificial microvascular systems for self-repair of materials damage, such as cracks in a coating applied to a building or bridge, have relied on capillary force for transport of the healing agents. Now, researchers have demonstrated that an active pumping capability for pressurized delivery of liquid healing agents in microvascular systems significantly improves the degree of healing compared with capillary force methods.  |
| Hydrogen released to fuel cell more quickly when stored in metal nanoparticles Posted: 29 Sep 2011 09:28 AM PDT Researchers have demonstrated that the size of a metal alloy nanoparticle influences the speed with which hydrogen gas is released when stored in a metal hydride. The smaller the size of the nanoparticle, the greater the speed at which the hydrogen gas makes its way to the fuel cell.  |
| Redefining the kilogram and the ampere Posted: 29 Sep 2011 04:42 AM PDT New research using graphene presents the most precise measurements of the quantum Hall effect ever made, one of the key steps in the process to redefine two Système Internationale d'unités (SI) units. New research is underpinning the biggest change in the SI Units since the system began 50 years ago.  |
| Stardust discovered in far-off planetary systems Posted: 29 Sep 2011 04:40 AM PDT Searching for extra-solar planets -- which are planets outside of our solar system -- is very popular these days. About 700 planets are known at the moment, a number that is continuously rising due to refined observational techniques. Astronomers have just made a remarkable discovery: they were able to establish proof of so-called debris discs around two stars. The debris discs are remnants of the formation of the planets.  |
| World's first energy-storage membrane devised Posted: 29 Sep 2011 04:40 AM PDT Performance of a novel membrane surpasses existing rechargeable batteries and supercapacitors, promising a low-cost, environmentally-friendly energy source. Electrical energy storage and its management is becoming an urgent issue due to climate change and energy shortage. Scientists have now developed a membrane that not only promises greater cost-effectiveness in delivering energy, but is also an environmentally-friendly solution.  |
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