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Duane Sharrock

A Working Assault Rifle Made With a 3-D Printer | Popular Science - 0 views

www.popsci.com/...assault-rifle-made-3-d-printer

3-D printing guns HaveBlue 3-D design Thingiverse Makerbot

shared by Duane Sharrock on 30 Aug 12 - No Cached
  • HaveBlue has also been testing the "marketplace" for 3-D printing weapons. To do this he asked Thingiverse, the 3-D design sharing site run by Makerbot Industries, whether it was permissible to post weapons designs or not. According to HaveBlue, Makerbot's senior leadership decided to not disallow, but to discourage, the posting of weapons designs. Haveblue then posted a design for an AR-15 part on Thingiverse, but in the intensive legal discussion that followed Haveblue's posting, Thingiverse decided to ban weapons designs outright. However, since Haveblue's design is still on the site, it's unclear whether Thingiverse is enforcing a ban or not.
  • Duane Sharrock on 30 Aug 12
     
    An amateur gunsmith, operating under the handle of "HaveBlue" (incidentally, "Have Blue" is the codename that was used for the prototype stealth fighter that became the Lockheed F-117), announced recently in online forums that he had successfully printed a serviceable .22 caliber pistol. Despite predictions of disaster, the pistol worked. It successfully fired 200 rounds in testing.
thinkahol *

Medical Daily: Reproductive scientists create mice from 2 fathers - 0 views

www.medicaldaily.com/...create-mice-from-2-fathers.htm

Medical Daily: Reproductive scientists create mice from 2 fathers

shared by thinkahol * on 12 Dec 10 - No Cached
  • thinkahol * on 12 Dec 10
     
    Using stem cell technology, reproductive scientists in Texas, led by Dr. Richard R. Berhringer at the M.D. Anderson Cancer Center, have produced male and female mice from two fathers.
thinkahol *

Why Do Intel's 3-D Transistors Matter? -- InformationWeek - 0 views

www.informationweek.com/...229402837

Why Do Intel's 3-D Transistors Matter? -- InformationWeek

shared by thinkahol * on 05 May 11 - No Cached
  • thinkahol * on 05 May 11
     
    The chipmaker's new transistor design leapfrogs competitors for now; here's how it works and why all computer chips will eventually use the technology.
thinkahol *

Toward optical computing in handheld electronics: Graphene optical modulators could lea... - 0 views

www.sciencedaily.com/...110508134927.htm

Toward optical computing in handheld electronics: Graphene modulators could lead to ultrafast communications

shared by thinkahol * on 09 May 11 - No Cached
  • thinkahol * on 09 May 11
     
    Graphene-based modulators could soon allow consumers to stream full-length, high-definition, 3-D movies onto a smartphone in a matter of seconds, the researchers said.
thinkahol *

In a genetic research first, researchers turn zebrafish genes off and on - 0 views

www.sciencedaily.com/...110508134922.htm

In a genetic research first researchers turn zebrafish genes off and on

shared by thinkahol * on 09 May 11 - No Cached
  • thinkahol * on 09 May 11
     
    ScienceDaily (May 9, 2011) - Mayo Clinic researchers have designed a new tool for identifying protein function from genetic code. A team led by Stephen Ekker, Ph.D., succeeded in switching individual genes off and on in zebrafish, then observing embryonic and juvenile development. The study appears in the journal Nature Methods.
thinkahol *

Hybrid solar system makes rooftop hydrogen | KurzweilAI - 0 views

www.kurzweilai.net/-system-makes-rooftop-hydrogen

Hybrid solar system makes rooftop hydrogen | KurzweilAI

shared by thinkahol * on 14 Aug 11 - No Cached
  • thinkahol * on 14 Aug 11
     
    Duke University engineer Nico Hotz has proposed a hybrid solar system in which sunlight heats a combination of water and methanol in a maze of tubes on a rooftop to produce hydrogen. The device is a series of copper tubes coated with a thin layer of aluminum and aluminum oxide and partly filled with catalytic nanoparticles. A combination of water and methanol flows through the tubes, which are sealed in a vacuum. Once the evaporated liquid achieves higher temperatures, tiny amounts of a catalyst are added, which produces hydrogen. This combination of high temperature and added catalysts produces hydrogen very efficiently, Hotz said. The resulting hydrogen can then be immediately directed to a fuel cell to provide electricity to a building during the day, or compressed and stored in a tank to provide power later. After two catalytic reactions, the system produced hydrogen much more efficiently than current technology without significant impurities, Hotz said. The resulting hydrogen can be stored and used on demand in fuel cells. "This set-up allows up to 95 percent of the sunlight to be absorbed with very little being lost as heat to the surroundings," he said. "This is crucial because it permits us to achieve temperatures of well over 200 degrees Celsius within the tubes. By comparison, a standard solar collector can only heat water between 60 and 70 degrees Celsius." Holtz performed a cost analysis, comparing a standard photovoltaic cell, a photocatalytic system, and the hybrid solar-methanol system.  He found that the hybrid system is the least expensive solution, with a total installation cost of $7,900 if designed to fulfill the requirements in summer. The paper describing the results of Hotz's analysis was named the top paper during the ASME Energy Sustainability Fuel Cell 2011 conference in Washington, D.C. Topics: Energy | Nanotech/Materials Science
Duane Sharrock

Medical devices powered by the ear itself - MIT News Office - 0 views

www.mit.edu/...biological-battery-1107.html

medical devices powered ear mit news battery otolaryngology Focus Center Research Program the National Institute Deafness and Other Communication Disorders Bertarelli Foundation

shared by Duane Sharrock on 09 Nov 12 - No Cached
  • Health Sciences and Technology (HST) demonstrate for the first time that this battery could power implantable electronic devices without impairing hearing.
  • The devices could monitor biological activity in the ears of people with hearing or balance impairments, or responses to therapies. Eventually, they might even deliver therapies themselves
  • “In the past, people have thought that the space where the high potential is located is inaccessible for implantable devices, because potentially it’s very dangerous if you encroach on it,” Stankovic says. “We have known for 60 years that this battery exists and that it’s really important for normal hearing, but nobody has attempted to use this battery to power useful electronics.”
  • ...5 more annotations...
  • The ear converts a mechanical force — the vibration of the eardrum — into an electrochemical signal that can be processed by the brain; the biological battery is the source of that signal’s current. Located in the part of the ear called the cochlea, the battery chamber is divided by a membrane, some of whose cells are specialized to pump ions. An imbalance of potassium and sodium ions on opposite sides of the membrane, together with the particular arrangement of the pumps, creates an electrical voltage.
  • Low-power chips, however, are precisely the area of expertise of Anantha Chandrakasan’s group at MTL
  • The frequency of the signal was thus itself an indication of the electrochemical properties of the inner ear.
  • in cochlear implants, diagnostics and implantable hearing aids. “The fact that you can generate the power for a low voltage from the cochlea itself raises the possibility of using that as a power source to drive a cochlear implant,” Megerian says. “Imagine if we were able to measure that voltage in various disease states. There would potentially be a diagnostic algorithm for aberrations in that electrical output.”
  • “I’m not ready to say that the present iteration of this technology is ready,” Megerian cautions. But he adds that, “If we could tap into the natural power source of the cochlea, it could potentially be a driver behind the amplification technology of the future.”
  • Duane Sharrock on 09 Nov 12
     
    "For the first time, researchers power an implantable electronic device using an electrical potential - a natural battery - deep in the inner ear."
  • Duane Sharrock on 09 Nov 12
     
    "All of D-Lab's classes assess the needs of people in less-privileged communities around the world, examining innovations in technology, education or communications that might address those needs. The classes then seek ways to spread word of these solutions - and in some cases, to spur the creation of organizations to help disseminate them. Specific projects have focused on improved wheelchairs and prosthetics; water and sanitation systems; and recycling waste to produce useful products, including charcoal fuel made from agricultural waste."
Duane Sharrock

Tissue engineering: Growing new organs, and more - MIT News Office - 0 views

www.mit.edu/...ering-growing-organs-1214.html

tissue engineering growing mit office scaffolding Sangeeta Bhatia regeneration replacement organ skin stem cells

shared by Duane Sharrock on 21 Dec 12 - No Cached
  • This kind of disease modeling could have a great impact in the near term, says MIT professor Sangeeta Bhatia, who is developing liver tissue to study hepatitis C and malaria infection.
  • liver is difficult to grow outside the human body because cells tend to lose their function when they lose contact with neighboring cells. “
  • In a large-scale project recently funded by the Defense Advanced Research Projects Administration, several MIT faculty members are working on a “human-on-a-chip” system that scientists could use to study up to 10 human tissue types at a time.
  • ...6 more annotations...
  • Biological and Mechanical Engineering
  • developing regenerative therapies that help promote wound healing.
  • Endothelial cells, normally found lining blood vessels, could help repair damage caused by angioplasty or other surgical interventions; smoke inhalation; and cancer or cardiovascular disease.
  • One of the earliest successes of implantable tissues was the development of artificial skin, which is now commonly used to treat burn victims.
  • Langer is now working on more complex tissues, such as cardiac-tissue scaffolds that include electronic sensors and a synthetic polymer that could restore vocal-cord function in people who have lost their voices through overuse or other types of damage
  • In Bhatia’s lab, where tissue-engineering research is evenly divided between modeling diseases and working toward implantable organs, researchers recently developed 3-D liver tissues that include their own network of blood vessels
  • Duane Sharrock on 21 Dec 12
     
    "MIT News examines research with the potential to reshape medicine and health care through new scientific knowledge, novel treatments and products, better management of medical data, and improvements in health-care delivery. "
  • Duane Sharrock on 21 Dec 12
     
    "MIT News examines research with the potential to reshape medicine and health care through new scientific knowledge, novel treatments and products, better management of medical data, and improvements in health-care delivery. "
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