Posted on 08 March 2010 by admin
A team of scientists at MIT has discovered a previously unknown phenomenon that can cause powerful waves of energy to shoot through minuscule wires known as carbon nanotubes, a discovery that could lead to a new way of producing electricity.
The phenomenon, described as thermopower waves, “opens up a new area of energy research, which is rare,” said Michael Strano, MIT’s Charles and Hilda Roddey Associate Professor of Chemical Engineering, who was the senior author of a paper describing the new findings.
Like a collection of flotsam propelled along the surface by waves traveling across the ocean, it turns out that a thermal wave — a moving pulse of heat — traveling along a microscopic wire can drive electrons along, creating an electrical current. The key ingredient in the recipe is carbon nanotubes — submicroscopic hollow tubes made of a chicken-wire-like lattice of carbon atoms.
In the new experiments, each of these electrically and thermally conductive nanotubes was coated with a layer of a highly reactive fuel that can produce heat by decomposing.
This fuel was then ignited at one end of the nanotube using either a laser beam or a high-voltage spark, and the result was a fast-moving thermal wave travelling along the length of the carbon nanotube like a flame speeding along the length of a lit fuse.
According to Strano, in the group’s initial experiments, when they wired up the carbon nanotubes with their fuel coating in order to study the reaction, “lo and behold, we were really surprised by the size of the resulting voltage peak” that propagated along the wire.
Posted on 19 February 2010 by admin
This traditional portrait of Athanasius Kircher gives his age as 76. The engraver has emphasized the energy in Kircher’s inquiring eyes. A professor of eloquence in Rome added the flowery inscription: “The painter or poet would declare only in error: ‘This is the man.’ But the farthest Antipodes know his name and face.”
Posted on 07 February 2010 by admin
The green brigade has precisely touched most of the industries; Automobile can be left as the fuel consumption is the highest in this sector. Efforts have been made in the past to promote electric cars but the end result has not been impressive to many. Electronic cars launched previously had few draw backs like their top speed not exceeding 20 miles per hour, long recharge hours, expensive and two seating capacity. Though they make no noise and are pollution free vehicles it didn’t made any difference.
A lot of time and money has been put in developing these electric cars and make them more lucrative to the buyer.
UK is coming up with a Electric car which will be a four seater, can run up to 70 miles without bothering to be recharged. It’s a Citroen C1 based car, which is joint venture by Peugeot, Toyota and Citroen. It shall take only six to seven hours to charge and can be charged in a 13a normal socket. Subsidies are also being discussed with British government to encourage people to go in for a Citroen C1. By 2011 Citroen C1will hit the market.
Posted on 24 September 2009 by admin
Robert Oppenheimer – father of the American atomic bomb, the head of the Manhattan Project.
Military generals and Robert Oppenheimer inspect the ruins of the tower after the first test of the atomic bomb on July 16 1945.
Posted on 01 August 2009 by admin
In a new research, scientists have found for the first time that ethane and heavier hydrocarbons can be synthesised under the pressure-temperature conditions of the upper mantle of the Earth.
The research was conducted by scientists at the Carnegie Institution’s Geophysical Laboratory, with colleagues from Russia and Sweden.
Methane (CH4) is the main constituent of natural gas, while ethane (C2H6) is used as a petrochemical feedstock.
Posted on 25 July 2009 by admin
AORA, a leading Israeli solar energy technology company, launched world’s first hybrid solar thermal power station at Kibbutz Samar in southern Israel.
This marked the first time that concentrating solar power (CSP) stations can provide environmentally-friendly power 24 hours a day, according to AORA’s CEO, Haim Fried.
AORA’s “Power Flower” station, named due to its unique yellow tulip design, consists of a field of 30 tracking mirrors (heliostats) situated on half an acre of land.
Each of the station’s 30 heliostats tracks the sun and reflects its rays towards the top of a 30 meter-high tower housing a special solar receiver along with a 100 kilowatt gas turbine.
Posted on 25 July 2009 by admin
Scientists at the Indian Institute of Science in Bangalore, along with researchers in Italy, have found two types of liquid water that have long been suspected to exist below water’s normal freezing point.
Unlike most liquids, water becomes less rather than more dense when it freezes — and it is densest not when it is coldest (at 0 degrees Celsius, just before it freezes) but at 4 degrees C.
These are just two of water’s host of anomalous properties, some of which are crucial to its behaviour in the natural environment.
In 1992, Gene Stanley of Boston University, Massachusetts, and his co-workers carried out computer simulations of water, which suggested that hydrogen bonds in water might produce two different types of liquid if water was made very cold and squeezed to high pressures.