Category Archives: Engineering

Women Working in Science

The commission found that women have doubled their share of bachelor’s degrees in science and engineering over the last four decades. In 1966, they earned one quarter (24.8 percent) of bachelor’s degrees in those fields, while in 2004, they earned half (50.4 percent). Over the same time span, women also gained a dramatically greater percentage of master’s degrees – 13.3 percent in 1966 versus 43.6 percent in 2004. At the doctorate level, the increase was especially noteworthy – 8 percent in 1966 compared to 37.4 percent in 2004.

Proportion of Females in the following fields, from the article:
Psychologists 67.3%
Biological Scientists 48.7%
Computer Programmers 26.0%
Chemical Engineers 14.3%
Mechanical Engineers 5.8%

Trash + Plasma = Electricity

The Prophet of Garbage (broken link removed):

Startech’s trash converter uses superheated plasma to reduce garbage to its molecular components.
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Perhaps the most amazing part of the process is that it’s self-sustaining. Just like your toaster, Startech’s Plasma Converter draws its power from the electrical grid to get started. The initial voltage is about equal to the zap from a police stun gun. But once the cycle is under way, the 2,200ËšF syngas is fed into a cooling system, generating steam that drives turbines to produce electricity. About two thirds of the power is siphoned off to run the converter; the rest can be used on-site for heating or electricity, or sold back to the utility grid.
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Over the past decade, half a dozen companies have been developing plasma technology to turn garbage into energy. “The best renewable energy is the one we complain about the most: municipal solid waste,” says Louis Circeo, the director of plasma research at the Georgia Institute of Technology. “It will prove cheaper to take garbage to a plasma plant than it is to dump it on a landfill.” A Startech machine that costs roughly $250 million could handle 2,000 tons of waste daily, approximately what a city of a million people amasses in that time span.

Related: Turning Trash into Electricity

Broken link http://www.popsci.com/popsci/science/873aae7bf86c0110vgnvcm1000004eecbccdrcrd.html

Cool Falkirk Wheel Canal Lift

Falkirk Wheel:

The wheel, which has an overall diameter of 35 metres, consists of two opposing arms which extend 15 metres beyond the central axle, and which take the shape of a Celtic-inspired, double-headed axe. Two sets of these axe-shaped arms are attached about 25 metres apart to a 3.5 metre diameter axle. Two diametrically opposed water-filled caissons, each with a capacity of 80,000 gallons (302 tons), are fitted between the ends of the arms.

These caissons always weigh the same whether or not they are carrying their combined capacity of 600 tonnes of floating canal barges as, according to Archimedes’ principle, floating objects displace their own weight in water, so when the boat enters, the amount of water leaving the caisson has exactly the same as the boat. This keeps the wheel balanced and so, despite its enormous mass, it rotates through 180Â° in less than four minutes while using very little power. It takes just 22.5 kilowatts (kW) to power the electric motors, which consume just 1.5 kilowatt-hours (kWh) of energy in four minutes, roughly the same as boiling eight kettles of water.

Pretty cool – follow link for more info and larger image. Less cool canal photos: Monocacy Aqueduct in Maryland, USA,here is the aqueduct (in this case, a bridge that is an carries a water for a canal).

IBM Believes New DRAM will Double Performance

IBM drives road to denser CPU memory

By combining techniques in process and circuit design, IBM believes it can put as much as 48 Mbytes of fast DRAM on a reasonably sized CPU when its 45nm technology becomes available in 2008.
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BM combined two advances to enable the new memory integration. The company found a way to migrate its deep trench technology used for DRAMs from CMOS to its silicon-on-insulator (SOI) logic process. In a paper last December, IBM described that work that involved suppressing the floating-body effect in SOI.

Article on Sergey Brin

The Story of Sergey Brin by Mark Malseed:

In the summer of 1990, a few weeks before Sergey’s 17th birthday, Michael led a group of gifted high school math students on a two-week exchange program to the Soviet Union. He decided to bring the family along, despite uneasiness about the welcome they could expect from Communist authorities. It would give them a chance to visit family members still living in Moscow, including Sergey’s paternal grandfather, like Michael, a Ph.D. mathematician.
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When he won a prestigious National Science Foundation scholarship for graduate school, he insisted on Stanford. (M.I.T. had rejected him.) Aside from the physical beauty of Stanford’s campus, Sergey knew the school’s reputation for supporting high-tech entrepreneurs. At the time, though, his focus was squarely on getting his doctorate.

He provides another example of someone born outside the USA providing great benefit to the US. The United States has done very well allowing others to flourish here.

Shouldn’t Google Toolbar spell check have Sergey and Brin as words?

Undersea Restaurant

Take a vacation and visit this cool engineering project: Hilton Maldives Resort & Spa Rangali Island (they broke link so I removed it).

Bionanotechnology Future

Commercialization and Future Developments in Bionanotechnology by Marcel P. Bruchez:

The lack of specifiability of our modules was a key challenge to commercialization. Specification will require detailed basic investigations of the properties and chemistry of nanoparticle materials in biological systems. In addition, we will have to establish analytical tools and quantitative descriptors to detail the distribution of properties present in a population of nanoparticles. This is categorically different from specification for organic molecules and proteins, in which properties can be effectively described by an average. In nanomaterials, performance properties may be dominated by a relatively small population of particles, so averaging cannot always be used.

Interesting paper, from The Bridge, an open-access publication of the National Academy of Engineering. This issue includes papers from the 12th U.S. Frontiers of Engineering including: New Mobility: The Next Generation of Sustainable Urban Transportation and Creating Intelligent Agents in Games.

Chimps Used Stone “Hammers”

Ancient chimp-made ‘hammers’ fuel evolutionary debate:

The stone hammers that the team discovered, essentially irregularly shaped rocks about the size of cantaloupes – with distinctive patterns of wear – were used to crack the shells of nuts. The research demonstrates conclusively that the artifacts couldn’t have been the result of natural erosion or used by humans. The stones are too large for humans to use easily and they also have the starch residue from several nuts known to be staples in the chimpanzee diet, but not the human diet.

Using so-called “percussive technology” to free the edible parts of nuts is more complicated than it sounds. “We know that modern chimpanzee behaviour regarding nut-cracking is socially transmitted and takes up to seven years to learn,” Mercader says. “Some of the nuts require a compression force of more than a thousand kilograms to crack. And the idea is to crack the shell but not smash it – it’s not a simple technique.”

The discovery suggests that a ‘chimpanzee stone age’ reaches well back to ancient times. “Chimpanzee material culture has a long prehistory whose deep roots are only beginning to be uncovered,” the authors write.

Pakistan Engineering Education

HEC’s Unconvincing Mega Projects by Pervez Hoodbhoy:

The on-going efforts at reforming higher education are turning into a disaster. Billions are being spent on mindless mega projects. The 15-fold increase in the funding of Pakistani universities over the last six years may have delivered a marginal improvement, but it is superficial and likely to be temporary.
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a realistic and modest course of action with real chances of success would have to be designed differently. We should initially aim for, at the very most, two properly planned new engineering universities under the collective authority of the European Union. We also need external help for adding engineering departments to existing universities, and to massively upgrade existing ones. It is still not too late to ask for this.

While I have no knowledge of the this situation in Pakistan the thoughts expressed in the essay make sense to me. I support investing in science and engineering education as a aid to economic growth and societal well being. But that investment must work with the existing local situation.

Mini Helicopter Masters Insect Navigation Trick

Mini helicopter masters insect navigation trick:

A miniature robotic helicopter has revealed a simple yet effective visual trick that lets insects fly so adeptly without sophisticated avionics.
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As insects fly forwards the ground beneath them sweeps backwards through their field of view. This “optical flow” is thought to provide crucial cues about speed and height. For example, the higher an insect’s altitude, the slower the optical flow; the faster it flies, the faster the optical flow.

Previous experiments involving bees suggest that optical flow is crucial to landing. Maintaining a constant optical flow while descending should provide a constant height-to-groundspeed ratio, which makes a bee slowdown as it approaches the ground. Distorting this optical flow can cause them to crash land instead.