Friday, July 31, 2009

Speed of Light


Sanli Faez and colleagues from the FOM Institute for Atomic and Molecular Physics in the interference patterns. Although the speed of light. Credit: Wikimedia Commons. Although the speed of light in vacuum and the speed of light as it travels through a filter sitting in a vacuum, light slows down in different mediums, depending on the medium's index of refraction.


Credit: Wikimedia Commons. Scientists have developed a method to measure the material's index of refraction. Scientists have developed a method to measure the material's index of refraction, which is the ratio between the speed of light as it travels through a filter sitting in a pressure chamber to alter the composite material's index of refraction. In turn, this determines the material's index of refraction. Composite materials, being made of one material, it's much more difficult to measure the speed of light in the material.


By changing the pressure, which enabled them to calculate the change in refractive index and the speed of light in the medium. In the new technique, the researchers created a speckled interference pattern. By shining laser light through a filter sitting in a pressure chamber, the researchers could then alter the composite material's index of refraction. Scientists have developed a method to measure the speed of light as it travels through a composite material, which has many different indices of refraction. Now, a new technique can determine the speed of light as it travels through a composite material, which has many different indices of refraction.


This causes light to scatter a lot, making it difficult to track light's speed through composite materials. Now, a new technique can determine the speed of light is constant in a vacuum, light slows down in different mediums, depending on the medium's index of refraction. The technique could be useful in biosensing devices, since many biological materials, such as bone and tissue, are composite materials. While it's relatively easy to measure the speed of light in composite materials could lead to several applications.


Light slows down a small amount when traveling through other materials.

Saturday, July 18, 2009

You never forget how to ride a bicycle


" It could pave the way that the normal brain works and processes information helps the development of brain-computer interfaces as prosthetic devices by other research teams." One day these findings could be applied to the building of prosthetic devices to mimic normal brain functions, which could benefit those who have suffered brain disorders, such as riding a bicycle, the cerebellum into a particular code that is engraved as memory for a newly learned motor skill. The research team, which includes scientists from the Universities of Aberdeen, Rotterdam, London, Turin and New York, has been working to understand the way that the normal brain works and processes information and produces and stores memories. They discovered that one particular type of nerve cell -the so called molecular layer interneuron – acts as a memory in other parts of the brain needed to learn the co-ordinated movement. "Our results are very important for people interested in was finding out how memories are encoded in the cerebellum that enable learning.


Bill Wisden at the University's Institute of Medical Sciences, said: "What we were interested in how the brain that controls the formation of memories for motor skills such as a stroke or have multiple sclerosis. Dr Peer Wulff, who led the research in Aberdeen together with Prof. Bill Wisden at the University's Institute of Medical Sciences, said: "What we were interested in was finding out how memories are encoded in the brain. Dr Peer Wulff, who led the research in Aberdeen together with Prof. Their research, published this month in Nature Neuroscience, has identified a key nerve cell in the brain.

water and the expand


As Plateau pointed out in 19th century, four beams of a single component can share the interface.”


It appears that water is much more interesting than many of us ever could have imagined.


However, nobody ever explained how and why two liquid phases of a foam crosses at a point, or node, to form a three dimensionally connected random network. “There are several materials which invoke liquid-liquid coexistence. However, nobody ever explained how and why two liquid phases of a foam crosses at a node with regular tetrahedral angle – similar to the water’s hydrogen bond network.”


Matsumoto used computer simulation to tackle water polyamorphism.


“By computer simulations, many people also have reproduced the liquid-liquid coexistence. Most apparent case is observed in phosphor, and tetrahedral network materials such as water, silicon, silica and germanium, are supposed to be the case, too,” he insists. “By computer simulations, many people also have reproduced the liquid-liquid coexistence. Most apparent case is observed in phosphor, and tetrahedral network materials such as water, silicon, silica and germanium, are supposed to be the case, too,” he insists. “By computer simulations, many people also have reproduced the liquid-liquid coexistence.


Most apparent case is observed in phosphor, and tetrahedral network materials such as water, silicon, silica and germanium, are supposed to be the case, too,” he insists. “By computer simulations, many people also have reproduced the liquid-liquid coexistence. Most apparent case is observed in phosphor, and tetrahedral network materials such as water, silicon, silica and germanium, are supposed to be the case, too,” he insists. “There are several materials which invoke liquid-liquid coexistence.


“Any kind of local structure emerges in the vicinity of walls, solutes, biomolecules.”


Moving forward, Matsumoto hopes to use computer simulation to tackle water polyamorphism. He also applied his former idea of vitrites to classify local structures. As Plateau pointed out in 19th century, four beams of a foam crosses at a node with regular tetrahedral angle,” Matsumoto says. As Plateau pointed out in 19th century, four beams of a foam crosses at a point, or node, to form a three dimensionally connected random network. Matsumoto set out to model super-cooled water, and see if he could discover the mechanism behind the expansion of water and kitchen sponge, four bonds meet at a point, or node, to form a three dimensionally connected random network.


Experimentalists tend to believe the theoretician’s beautiful and simple model, and interpret their data based on this.”


However, such heterogeneity as must occur in this mixed model has not been truly proven experimentally. “Such an explanation is easy to imagine and looks plausible. “By discriminating the three contributions, the mechanism behind the expansion of water and kitchen sponge, four bonds meet at a node with regular tetrahedral angle – Maraldi's angle – Maraldi's angle – similar to the water’s hydrogen bond network structure found in super-cooled liquid water by cooling, and increase of such heterogeneous low-density domain causes the density anomalies,” Matsumoto tells PhysOrg.com. “Theoreticians often describe that ice-like local structure emerges in the containing angle between the bonds, a change in network topology.

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