Category Archives: Students

Items for students and others, interested in learning about science and engineering and the application of science in our lives. We post many of the general interest items here.

RoboCup German Open 2008

Video of humanoid robot football (soccer) competition in German, April 2008. They are a bit slow but it sure looks like this is a fun area to watch the improvement of robot engineering.

Alligator Blood Provides Strong Resistance to Bacteria and Viruses

Gator Blood May Be New Source of Antibiotics

The study authors, from McNeese State University and Louisiana State University, said their research is the first to take an in-depth look at alligator blood’s prospects as an antibiotic source. According to the researchers, alligators can automatically fight germs such as bacteria and viruses without having been exposed to them before launching a defense.

For the study, the researchers extracted proteins known as peptides from white cells in alligator blood. As in humans, white cells are part of the alligator’s immune system. The researchers then exposed various types of bacteria to the protein extracts and watched to see what happened.

In laboratory tests, tiny amounts of these protein extracts killed a so-called “superbug” called methicillin-resistant Staphylococcus aureus, or MRSA. The bacteria has made headlines in recent years because of its killing power in hospitals and its spread among athletes and others outside of hospitals.

The extracts also killed six of eight strains of a fungus known as Candida albicans, which causes a condition known as thrush, and other diseases that can kill people with weakened immune systems.

Data Center Energy Needs

It’s Too Darn Hot

The tech industry is facing an energy crisis. The cost of power consumption by data centers doubled between 2000 and 2006, to $4.5 billion, and could double again by 2011, according to the U.S. government. With energy prices spiking, the challenge of powering and cooling these SUVs of the tech world has become a major issue for corporations and utilities.
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The modern data center is like a vast refrigerator with hundreds or thousands of ovens blazing away inside. Six-foot-tall metal racks stacked with pizza box-size computers, storage devices, and network-routing machines are lined up in rows. Chilled air blows through the equipment from vents in the floors of “cold aisles.” Hot air blows out of the back ends into “hot aisles” and is drawn off and vented out of the building. Inside the centers, there’s a dull roar as large quantities of air shoot through ducts, vents, and computers.

So intense is the competition among tech companies to lower their costs of processing data that some treat information about their energy use like state secrets.
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The $4.5 billion spent in the U.S. in 2006 is the equivalent of the electric bills for 5.8 million U.S. households.

When you realize the huge cooling needs (in addition to the need for electricity to run the computers) you can see the huge advantage of a cold climate where you can take advantage of cool air for cooling.

2,000-year-old Seed to Bear Fruit in Three Years

2,000-year-old seed set to bear fruit in three years

Having been germinated, astoundingly, by an Israeli team more than three years ago, and kept alive since, the “Judean date” sapling appears likely (but not certain) to yield a now-extinct species of date that was renowned in ancient times as a treatment for heart disease, chest problems, the spitting of blood, weakened memory and other medical conditions, possibly even symptoms of cancer and depression.

The seed was discovered during the 1960s archaeological excavations of Masada by Prof. Yigael Yadin, an eminent Israeli archeologist, political leader and the second IDF chief of General Staff.

The Judean Dead Sea region was famous for its extensive and high-quality date culturing in the first century CE. High summer temperatures and low precipitation at Masada contributed to the seed’s exceptional longevity.

Cloak of Silence

Experts unveil ‘cloak of silence’

“The mathematics behind cloaking has been known for several years,” said Professor John Pendry of Imperial College London, UK, an expert in cloaking. “What hasn’t been available for sound is the sort of materials you need to build a cloak out of.”
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The Spanish team who conducted the new work believe the key to a practical device are so-called “sonic crystals”. These artificial composites – also known as “meta-materials” – can be engineered to produce specific acoustical effects.
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The research builds on work by scientists from Duke University in North Carolina, US, and the Hong Kong University of Science and Technology. Earlier this year, independent teams from the two institutions demonstrated the mathematics necessary to create an acoustic cloak. Other scientists have shown that objects can be cloaked from electromagnetic radiation, such as microwaves.

Retooling Theory and Practice

“Education in the composites industry is haphazard at best,” admits Gregor Welpton, president of Black Feather Boats (Douglas, Alaska). Although a number of training programs for both engineers and technicians have been spawned over the years, they are essentially independent and, therefore, largely unrelated efforts. The product of universities, community colleges, regional training centers, technical institutes, private training companies and composites vendors, these offerings run a wide gamut from undergraduate and advanced degrees and technical certifications to short courses and periodic seminars. A variety of teaching methods are employed by these programs, including classroom instruction and/or video-based training, video-interactive training and, least likely, hands-on lab work.

“Currently, composites education is being driven by the individual institution,” explains Andre Cocquyt, president of GRPGuru (Brunswick, Maine) and one of the architects of a new composites training curriculum being developed in Brunswick. “There is no consistent approach, no consistent level of education, no qualification,” he adds. The unintended consequence is a dramatic variation in the competency levels of program graduates.

Speaking for many industry business owners, Welpton says the time has come for a coordinated industrywide education effort: “The industry needs an education initiative,” he says, “so that the employers know what they’re getting out of the institutions and the employees know what is expected of them when they show up to work.”

Buckminster Fuller: Dymaxion Man

Dymaxion Man

Fuller’s schemes often had the hallucinatory quality associated with science fiction (or mental hospitals). It concerned him not in the least that things had always been done a certain way in the past. In addition to flying cars, he imagined mass-produced bathrooms that could be installed like refrigerators; underwater settlements that would be restocked by submarine; and floating communities that, along with all their inhabitants, would hover among the clouds. Most famously, he dreamed up the geodesic dome. “If you are in a shipwreck and all the boats are gone, a piano top . . . that comes along makes a fortuitous life preserver,” Fuller once wrote. “But this is not to say that the best way to design a life preserver is in the form of a piano top. I think that we are clinging to a great many piano tops in accepting yesterday’s fortuitous contrivings.” Fuller may have spent his life inventing things, but he claimed that he was not particularly interested in inventions. He called himself a “comprehensive, anticipatory design scientist—”a “comprehensivist,” for short—and believed that his task was to innovate in such a way as to benefit the greatest number of people using the least amount of resources. “My objective was humanity’s comprehensive success in the universe” is how he once put it. “I could have ended up with a pair of flying slippers.”

Related: Buckminster Fuller $100,000 Challenge – Golden Buckyballs – Everything I Know, the historic 42-hour session with Buckminster Fuller

How Computers Boot Up

Things start rolling when you press the power button on the computer (no! do tell!). Once the motherboard is powered up it initializes its own firmware – the chipset and other tidbits – and tries to get the CPU running. If things fail at this point (e.g., the CPU is busted or missing) then you will likely have a system that looks completely dead except for rotating fans. A few motherboards manage to emit beeps for an absent or faulty CPU, but the zombie-with-fans state is the most common scenario based on my experience. Sometimes USB or other devices can cause this to happen: unplugging all non-essential devices is a possible cure for a system that was working and suddenly appears dead like this. You can then single out the culprit device by elimination.

If all is well the CPU starts running. In a multi-processor or multi-core system one CPU is dynamically chosen to be the bootstrap processor (BSP) that runs all of the BIOS and kernel initialization code. The remaining processors, called application processors (AP) at this point, remain halted until later on when they are explicitly activated by the kernel. Intel CPUs have been evolving over the years but they’re fully backwards compatible, so modern CPUs can behave like the original 1978 Intel 8086, which is exactly what they do after power up. In this primitive power up state the processor is in real mode with memory paging disabled. This is like ancient MS-DOS where only 1 MB of memory can be addressed and any code can write to any place in memory – there’s no notion of protection or privilege.

Video Cat Cam

I first wrote about the Cool Cat Cam about a year ago. Next, I interviewed the cat cam engineer. And
a few months ago I posted some photos by Fritz the Cat. Now enjoy some video catcat webcasts: Fritz in Aktion mit Catcam mit Musik – Catcam Smaka takes photos/Video! – Cat wears spy camera, makes film – Mr. Lee CatCam im MDR Aussenseiter-Spitzenreiter And then order your cat cam.

Plastic Balls for the Resevoir

photo of Los Angeles resevoir

This photo looks like a April fools joke but I think it is real. Los Angeles Drops 400,000 Balls in Reservoir to Fight Suspected Carcinogen

So why deploy these balls — which are typically used by airports to prevent bird congregation on runways — in particular? Some of the other alternatives, such as a large tarp or metal cover, were considered too costly or impractical. The balls, on the other hand, are (relatively) cheap — costing 40 cents each — and are safe for drinking water; black is also the only color able to deflect UV rays.

The DWP has ordered 6.5 million of these balls, 3 million of which it plans on using to blanket the Ivanhoe and Elysian reservoirs. So, yeah, this probably isn’t the best solution for the city’s water woes but, given the circumstances, maybe the only “realistic” option in the short-term.

Los Angeles Department of Water and Power drops 400,000 balls onto Ivanhoe Reservoir:

The water needs to be shaded because when sunlight mixes with the bromide and chlorine in Ivanhoe’s water, the carcinogen bromate forms, said Pankaj Parekh, DWP’s director for water quality compliance. Bromide is naturally present in groundwater and chlorine is used to kill bacteria, he said, but sunlight is the final ingredient in the potentially harmful mix.

Photo by (Irfan Khan / Los Angeles Times)

Call me a bit skeptical. Adding a huge number of plastic balls to a water supply in order to try and prevent a chemical reaction caused by added chemicals and sunlight seems a bit crazy to me. But who know maybe it is a good idea.