See what common passwords look like... And how not to.
http://securitynirvana.blogspot.com/2012/06/final-word-on-linkedin-leak.html
/A
Wednesday, June 26, 2013
Tuesday, June 25, 2013
Beyond Silicon: Transistors Without Semiconductors
(Fwd from Charu mama)
Beyond Silicon: Transistors Without Semiconductors
Michigan Tech News (06/21/13) Marcia Goodrich
Although electronic devices continue to shrink, transistors based on semiconductors can only get so small. "At the rate the current technology is progressing, in 10 or 20 years, they won't be able to get any smaller," says Michigan Technological University's Yoke Khin Yap. He also notes that semiconductors waste a lot of energy in the form of heat. He is working to develop semiconductor-less transistors using a nanoscale insulator with nanoscale metals on top. Yap and Oak Ridge National Laboratory researchers found that the method allowed electrons to jump very precisely from gold dot to gold dot, a phenomenon known as quantum tunneling. When sufficient voltage is applied, the transistor switches to a conducting state. When the voltage is lowered and turned off, the transistor returns to its natural state as an insulator. In addition, no electrons from the gold dots escaped, thus keeping the tunneling channel cool. The key to the gold-and-nanotube device is its submicroscopic size. "The gold islands have to be on the order of nanometers across to control the electrons at room temperature," notes Michigan Tech's John Jaszczak.
View Full Article
http://www.mtu.edu/news/stories/2013/june/story92119.html
----- End forwarded message -----
Beyond Silicon: Transistors Without Semiconductors
Michigan Tech News (06/21/13) Marcia Goodrich
Although electronic devices continue to shrink, transistors based on semiconductors can only get so small. "At the rate the current technology is progressing, in 10 or 20 years, they won't be able to get any smaller," says Michigan Technological University's Yoke Khin Yap. He also notes that semiconductors waste a lot of energy in the form of heat. He is working to develop semiconductor-less transistors using a nanoscale insulator with nanoscale metals on top. Yap and Oak Ridge National Laboratory researchers found that the method allowed electrons to jump very precisely from gold dot to gold dot, a phenomenon known as quantum tunneling. When sufficient voltage is applied, the transistor switches to a conducting state. When the voltage is lowered and turned off, the transistor returns to its natural state as an insulator. In addition, no electrons from the gold dots escaped, thus keeping the tunneling channel cool. The key to the gold-and-nanotube device is its submicroscopic size. "The gold islands have to be on the order of nanometers across to control the electrons at room temperature," notes Michigan Tech's John Jaszczak.
View Full Article
http://www.mtu.edu/news/stories/2013/june/story92119.html
----- End forwarded message -----
nano stuff
Beyond Silicon: Transistors without Semiconductors
Last Modified 8:10 AM on Fri Jun 21, 2013
mtunews@mtu.edu
906-487-2343,
By Marcia Goodrich
June 20, 2013—
For decades, electronic devices have been getting smaller, and smaller,
and smaller. It's now possible—even routine—to place millions of
transistors on a single silicon chip.
But transistors based on semiconductors can only get so small. "At the
rate the current technology is progressing, in 10 or 20 years, they
won't be able to get any smaller," said physicist Yoke Khin Yap of
Michigan Technological University. "Also, semiconductors have another
disadvantage: they waste a lot of energy in the form of heat."
Scientists have experimented with different materials and designs for
transistors to address these issues, always using semiconductors like
silicon. Back in 2007, Yap wanted to try something different that might
open the door to a new age of electronics.
"The idea was to make a transistor using a nanoscale insulator with
nanoscale metals on top," he said. "In principle, you could get a piece
of plastic and spread a handful of metal powders on top to make the
devices, if you do it right. But we were trying to create it in
nanoscale, so we chose a nanoscale insulator, boron nitride nanotubes,
or BNNTs for the substrate."
Yap's team had figured out how to make virtual carpets of BNNTs,which
happen to be insulators and thus highly resistant to electrical charge.
Using lasers, the team then placed quantum dots (QDs) of gold as small
as three nanometers across on the tops of the BNNTs, forming QDs-BNNTs.
BNNTs are the perfect substrates for these quantum dots due to their
small, controllable, and uniform diameters, as well as their insulating
nature. BNNTs confine the size of the dots that can be deposited.
In collaboration with scientists at Oak Ridge National Laboratory
(ORNL), they fired up electrodes on both ends of the QDs-BNNTs at room
temperature, and something interesting happened. Electrons jumped very
precisely from gold dot to gold dot, a phenomenon known as quantum
tunneling.
"Imagine that the nanotubes are a river, with an electrode on each bank.
Now imagine some very tiny stepping stones across the river," said Yap.
"The electrons hopped between the gold stepping stones. The stones are
so small, you can only get one electron on the stone at a time. Every
electron is passing the same way, so the device is always stable."
Yap's team had made a transistor without a semiconductor. When
sufficient voltage was applied, it switched to a conducting state. When
the voltage was low or turned off, it reverted to its natural state as
an insulator.
Furthermore, there was no "leakage": no electrons from the gold dots
escaped into the insulating BNNTs, thus keeping the tunneling channel
cool. In contrast, silicon is subject to leakage, which wastes energy in
electronic devices and generates a lot of heat.
Other people have made transistors that exploit quantum tunneling, says
Michigan Tech physicist John Jaszczak, who has developed the theoretical
framework for Yap's experimental research. However, those tunneling
devices have only worked in conditions that would discourage the typical
cellphone user.
"They only operate at liquid-helium temperatures," said Jaszczak.
The secret to Yap's gold-and-nanotube device is its submicroscopic size:
one micron long and about 20 nanometers wide. "The gold islands have to
be on the order of nanometers across to control the electrons at room
temperature," Jaszczak said. "If they are too big, too many electrons
can flow." In this case, smaller is truly better: "Working with
nanotubes and quantum dots gets you to the scale you want for electronic
devices."
"Theoretically, these tunneling channels can be miniaturized into
virtually zero dimension when the distance between electrodes is reduced
to a small fraction of a micron," said Yap.
Yap has filed for a full international patent on the technology.
Their work is described in the article "Room Temperature Tunneling
Behavior of Boron Nitride Nanotubes Functionalized with Gold Quantum
Dots," published online on June 17 in Advanced Materials. In addition to
Yap and Jaszczak, coauthors include research scientist Dongyan Zhang,
postdoctoral researchers Chee Huei Lee and Jiesheng Wang, and graduate
students Madhusudan A. Savaikar, Boyi Hao, and Douglas Banyai of
Michigan Tech; Shengyong Qin, Kendal W. Clark and An-Ping Li of the
Center for Nanophase Materials Sciences at ORNL; and Juan-Carlos Idrobo
of the Materials Science and Technology Division of ORNL.
The work was funded by the Office of Basic Energy Sciences of the US
Department of Energy (Award # DE-FG02-06ER46294, PI:Y.K.Yap) and was
conducted in part at ORNL (Projects CNMS2009-213 and CNMS2012-083, PI:
Y.K.Yap).
Michigan Technological University (www.mtu.edu) is a leading public
research university developing new technologies and preparing students
to create the future for a prosperous and sustainable world. Michigan
Tech offers more than 130 undergraduate and graduate degree programs in
engineering; forest resources; computing; technology; business;
economics; natural, physical and environmental sciences; arts;
humanities; and social sciences.
--
http://www.fastmail.fm - Same, same, but different...
Last Modified 8:10 AM on Fri Jun 21, 2013
mtunews@mtu.edu
906-487-2343,
By Marcia Goodrich
June 20, 2013—
For decades, electronic devices have been getting smaller, and smaller,
and smaller. It's now possible—even routine—to place millions of
transistors on a single silicon chip.
But transistors based on semiconductors can only get so small. "At the
rate the current technology is progressing, in 10 or 20 years, they
won't be able to get any smaller," said physicist Yoke Khin Yap of
Michigan Technological University. "Also, semiconductors have another
disadvantage: they waste a lot of energy in the form of heat."
Scientists have experimented with different materials and designs for
transistors to address these issues, always using semiconductors like
silicon. Back in 2007, Yap wanted to try something different that might
open the door to a new age of electronics.
"The idea was to make a transistor using a nanoscale insulator with
nanoscale metals on top," he said. "In principle, you could get a piece
of plastic and spread a handful of metal powders on top to make the
devices, if you do it right. But we were trying to create it in
nanoscale, so we chose a nanoscale insulator, boron nitride nanotubes,
or BNNTs for the substrate."
Yap's team had figured out how to make virtual carpets of BNNTs,which
happen to be insulators and thus highly resistant to electrical charge.
Using lasers, the team then placed quantum dots (QDs) of gold as small
as three nanometers across on the tops of the BNNTs, forming QDs-BNNTs.
BNNTs are the perfect substrates for these quantum dots due to their
small, controllable, and uniform diameters, as well as their insulating
nature. BNNTs confine the size of the dots that can be deposited.
In collaboration with scientists at Oak Ridge National Laboratory
(ORNL), they fired up electrodes on both ends of the QDs-BNNTs at room
temperature, and something interesting happened. Electrons jumped very
precisely from gold dot to gold dot, a phenomenon known as quantum
tunneling.
"Imagine that the nanotubes are a river, with an electrode on each bank.
Now imagine some very tiny stepping stones across the river," said Yap.
"The electrons hopped between the gold stepping stones. The stones are
so small, you can only get one electron on the stone at a time. Every
electron is passing the same way, so the device is always stable."
Yap's team had made a transistor without a semiconductor. When
sufficient voltage was applied, it switched to a conducting state. When
the voltage was low or turned off, it reverted to its natural state as
an insulator.
Furthermore, there was no "leakage": no electrons from the gold dots
escaped into the insulating BNNTs, thus keeping the tunneling channel
cool. In contrast, silicon is subject to leakage, which wastes energy in
electronic devices and generates a lot of heat.
Other people have made transistors that exploit quantum tunneling, says
Michigan Tech physicist John Jaszczak, who has developed the theoretical
framework for Yap's experimental research. However, those tunneling
devices have only worked in conditions that would discourage the typical
cellphone user.
"They only operate at liquid-helium temperatures," said Jaszczak.
The secret to Yap's gold-and-nanotube device is its submicroscopic size:
one micron long and about 20 nanometers wide. "The gold islands have to
be on the order of nanometers across to control the electrons at room
temperature," Jaszczak said. "If they are too big, too many electrons
can flow." In this case, smaller is truly better: "Working with
nanotubes and quantum dots gets you to the scale you want for electronic
devices."
"Theoretically, these tunneling channels can be miniaturized into
virtually zero dimension when the distance between electrodes is reduced
to a small fraction of a micron," said Yap.
Yap has filed for a full international patent on the technology.
Their work is described in the article "Room Temperature Tunneling
Behavior of Boron Nitride Nanotubes Functionalized with Gold Quantum
Dots," published online on June 17 in Advanced Materials. In addition to
Yap and Jaszczak, coauthors include research scientist Dongyan Zhang,
postdoctoral researchers Chee Huei Lee and Jiesheng Wang, and graduate
students Madhusudan A. Savaikar, Boyi Hao, and Douglas Banyai of
Michigan Tech; Shengyong Qin, Kendal W. Clark and An-Ping Li of the
Center for Nanophase Materials Sciences at ORNL; and Juan-Carlos Idrobo
of the Materials Science and Technology Division of ORNL.
The work was funded by the Office of Basic Energy Sciences of the US
Department of Energy (Award # DE-FG02-06ER46294, PI:Y.K.Yap) and was
conducted in part at ORNL (Projects CNMS2009-213 and CNMS2012-083, PI:
Y.K.Yap).
Michigan Technological University (www.mtu.edu) is a leading public
research university developing new technologies and preparing students
to create the future for a prosperous and sustainable world. Michigan
Tech offers more than 130 undergraduate and graduate degree programs in
engineering; forest resources; computing; technology; business;
economics; natural, physical and environmental sciences; arts;
humanities; and social sciences.
--
http://www.fastmail.fm - Same, same, but different...
Tuesday, June 18, 2013
Thursday, June 6, 2013
Colorimeter using PIC etc... homemade by UK 1-man co
Enjoy this interview:
http://banu.com/blog/41/interview-of-colorhug-maker-richard-hughes/
Also... you thought you know how to draw a circle ? Then read this:
http://banu.com/blog/7/drawing-circles/
/A
http://banu.com/blog/41/interview-of-colorhug-maker-richard-hughes/
Also... you thought you know how to draw a circle ? Then read this:
http://banu.com/blog/7/drawing-circles/
/A
Monday, June 3, 2013
Stanford's flying fish, graphene image sensor, space telescope for u
Stanford's flying fish glider:
http://www.gizmag.com/flying-fish-glider/27690/
Graphene image sensor for low light photography -- from NTU researchers
http://www.gizmag.com/graphene-imaging-sensor/27718/
Space telescope to take your pictures
http://singularityhub.com/2013/05/29/diamandis-and-planetary-resources-to-build-first-crowdfunded-public-space-telescope/
/A
http://www.gizmag.com/flying-fish-glider/27690/
Graphene image sensor for low light photography -- from NTU researchers
http://www.gizmag.com/graphene-imaging-sensor/27718/
Space telescope to take your pictures
http://singularityhub.com/2013/05/29/diamandis-and-planetary-resources-to-build-first-crowdfunded-public-space-telescope/
/A
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