An 1880s house in New Orleans, a triplex in Philadelphia and a Tudor near Salt Lake City.
I thought nuclear reactors were an absolute no-go for environmentalists. But I keep hearing them touted as a clean energy source. What are nuclear energy's green credentials?The All-Star Game at CitiField on Tuesday will follow several days of related attractions, like the Futures Game and a New York Philharmonic-Mariah Carey concert in Central Park. As Persian Gulf monarchs forcibly suppress street protests in the kingdom of Bahrain, the Obama adminstration has responded mostly with mild or muted objections - a sharp contrast from its demands for new governments in the republics of Egypt and Libya.
Nigel Evans, a deputy speaker questioned by the police on Saturday, said that the accusations of rape and sexual assault by two men were â€œcompletely false.â€ Al Qaedaâ€™s North African arm said Tuesday that it had beheaded a French hostage in retaliation for Franceâ€™s intervention in Mali, Mauritaniaâ€™s ANI news agency reported.
The dispute at the Flathead Reservation centers on a proposed bill that would specify who is entitled to the water, and how much they can take from the reservoirs and ditches. A Pentagon audit has found that the federal government overpaid a billionaire oilman by as much as $200 million on several military contracts
worth nearly $2.7 billion. A novel of Israelis and Palestinians looks to the days when there was an intimacy to the violence. MEXICO CITY - President Felipe Calderon proposed sweeping new measures Thursday to crack down on the cash smuggling and money laundering that allow trade miner review to use billions in U.S.
drug profits to enrich their criminal organizations. A new approach that allows objects to become â€œinvisibleâ€ has now been applied to an entirely different area: letting particles â€œhideâ€ from passing electrons, which could lead to more efficient thermoelectric devices and new kinds of electronics.The concept â€” developed by MIT graduate student Bolin Liao, former postdoc Mona Zebarjadi (now an assistant professor at Rutgers University), research scientist Keivan Esfarjani, and mechanical engineering professor Gang Chen â€” is described in a paper in the journal Physical Review Letters.Normally, electrons travel
through a material in a way that is similar to the
motion of electromagnetic waves, including light; their behavior can be described by wave equations. That led the MIT researchers to the idea of harnessing the cloaking mechanisms developed to shield objects from view â€” but applying it to the movement of electrons, which is key to electronic and thermoelectric devices.Previous work on cloaking objects from view has relied on so-called metamaterials made of artificial materials with unusual properties.
The composite structures used for cloaking cause light beams to bend around an object and then meet on the other side, resuming their original path â€” making the object appear invisible. â€œWe were inspired by this idea,â€ says
Chen, the Carl Richard Soderberg Professor of Power Engineering at MIT, who decided to study how it might apply to electrons instead of light. But in the new electron-cloaking material developed by Chen and his colleagues, the process is slightly different.
The MIT researchers modeled nanoparticles with a core of one material clickbank pirate review shell of another.
But in this case, rather than bending around the object, the
electrons do actually pass through the particles: Their paths are bent first one way, then back again, so they return to the same trajectory they began with.In computer simulations, the concept appears to work, Liao says. Now, the team will try to build actual devices to see whether they perform as expected. â€œThis was a first
step, a theoretical proposal,â€ Liao says. â€œWe want to carry on further research on how to make some real devices out of this strategy.â€While the initial concept was developed using
particles embedded in a normal semiconductor substrate, the MIT researchers would like to see if the results can be replicated with other materials, such as two-dimensional sheets of graphene, which might offer interesting additional properties.The MIT
researchersâ€™ initial impetus was to optimize the materials used in thermoelectric devices, which produce an electrical current from a temperature gradient. Such devices require a combination of characteristics that are hard to obtain: high electrical conductivity (so the generated current can flow freely), but low thermal conductivity (to maintain a temperature gradient).
But the two types of conductivity tend to coexist, so few materials offer these contradictory characteristics.
The teamâ€™s simulations show this electron-cloaking material
could meet these requirements unusually well.The simulations
used particles a few nanometers in size, matching the wavelength of flowing electrons and improving the flow of electrons at particular energy levels by orders of magnitude compared to traditional doping strategies. This might lead to more efficient filters or sensors, the researchers say. aquaponics 4 you download components on computer chips get smaller, Chen says, â€œwe have to come up with strategies to control electron transport,â€ and this might be one useful approach.The concept could also lead to a new kind of switches for electronic devices, Chen says.
The switch could operate by toggling between transparent and opaque to electrons, thus turning a flow of them on and off. â€œWeâ€™re really just at the beginning,â€ he says.
â€œWeâ€™re not sure how far this is going to go yet, but there is some potentialâ€ for significant applications.Xiang Zhang, a professor of mechanical engineering at the University of California at Berkeley who was not involved in this research, says â€œthis is very exciting workâ€ that expands the concept of cloaking to the domain of electrons. The authors, he says, â€œuncovered a very interesting approach that may be very useful to thermoelectric applications.â€This research was funded by the U.S. Department of Energy (DOE) through MITâ€™s Solid-State Solar-Thermal Energy Conversion center, a DOE Energy Frontier Research Center.
arrested last fall for protesting the military's
"don't ask, don't tell" policy are scheduled to appear in court Friday to face charges rarely pressed against groups demonstrating at or near federal property.
Today, the results of an early study on a controversial treatment for M.S. will be released. ATLANTA -- US Airways increased the pressure on Delta Air Lines' unsecured creditors to take its buyout offer by raising the bid Wednesday nearly 20 percent to $10.3
the deal would survive regulatory scrutiny may be the deciding factor. As Ellsworth Kellyâ€™s 90th birthday fat loss factor all over the world are presenting his work. Virginia Tech tailback Michael Holmes has been kicked out of school after being convicted of assault and battery.
Concerns about how the Interior Department manages the nation's oil and gas resources have earned it a spot on a closely watched list of the government's most at-risk offices and programs.
Everyone in attendance was blindfolded for the duration of the Lincoln Center Festivalâ€™s production of Lera Auerbachâ€™s unconventional opera â€œThe Blind.â€ to perform dwarf-galaxy archaeology, allowing us to better understand galaxy formation; U.S.
stocks fell for a second straight week as a jump in jobless claims and an unexpected slump in manufacturing in the Philadelphia area suggested that a rebound in corporate profit growth won't be sustained. The Federal Reserveâ€™s point man on bank regulation, Daniel Tarullo, is calling for big banks who rely on the debt markets for financing to hold more capital, adding to the growing pressure to rein in megabanks. Read full article >> At Jack Sandersâ€™s Heavy Metal
camp, welding is the medium but adventure is the mode.
Goodall, the primatologist known for her research on chimpanzees, said she was â€œdistressedâ€ that sources were not properly cited in an upcoming book on plants.
You bite your nails.
Your house is a sty.
You never signal before changing lanes, and when you finally reach your destination, you're 30 minutes late.
all have bad habits in real life.
Why can't technology help cure them? While technology should help us break bad habits, all too often it makes things