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Showing posts with label geek. Show all posts
Showing posts with label geek. Show all posts

Wednesday, October 24, 2012

5 crazy inventions from the mind of Nikola Tesla

Earthquake machines! Death rays! Those far-fetched gadgets are part of a plan to build a museum dedicated to one of history's most famous mad scientists

Early 20th century inventor Nikola Tesla was ahead of his time with concepts that ranged from x-rays to robotics.
Early 20th century inventor Nikola Tesla was ahead of his time with concepts that ranged from x-rays to robotics. Photo: Herbert Barraud/Getty Images

Nikola Tesla signature
Nikola Tesla signature (Photo credit: Wikipedia)
Matthew Inman, proprietor of web comic The Oatmeal, is on a mission to build a crowd-funded museum dedicated to inventor Nikola Tesla, who Inman refers to as "the greatest geek who ever lived." Inman's goal was to raise $850,000 (which would be matched dollar-for-dollar by a New York state grant) in 45 days. But surprisingly, a little more than a week into it, the online campaign has gathered more than $1.1 million in donations. Many of the inventor's fans think Tesla was more brilliant than his more famous contemporaries, including Alexander Graham Bell and Thomas Edison. Even though Tesla isn't exactly a household name, his unsung accomplishments and wild imagination have turned him into something of a folk hero. Here, a rundown of five of Tesla's craziest inventions:


Wireless transmission of power and energy demo...
Wireless transmission of power and energy demonstration during his high frequency and potential lecture of 1891 (Photo credit: Wikipedia)
1. Wireless energy transfer
About 120 years ago at the 1893 World Fair in Chicago, Tesla demonstrated that you could wirelessly transmit electricity by firing up a series of phosphorous light bulbs in a process he called electrodynamic induction. He dreamed that such technology would allow us to one day shoot power over long distances in the atmosphere, supplying distant destinations with the energy needed to live comfortably. Now over a century later, companies such as Intel and Sony are interested in applying the non-radiative energy transfer to things such as cell phones to allow you to charge your battery without messy power cables.

2. X-raysTesla's research in the field of electromagnetism helped give radiologists everywhere the ability to peer into a person's anatomy without cutting them open — a concept that, in the late 1800s, sounded far-fetched. Although German physicist Willhelm Röntgen is widely credited with the discovery of X-rays in 1895, Tesla's own experiments with the technology eight years prior highlighted some of the inherent dangers of using radiation on human flesh.

3. Death ray
In the 1930s Tesla reportedly invented a particle beam weapon that some, ironically, called a "peace ray," says Lauren Davis at io9. "The device was, in theory, capable of generating an intense targeted beam of energy" that could be used to dispose of enemy warplanes, foreign armies, "or anything else you'd rather didn't exist." The so-called "death ray" was never constructed, however, even though Tesla shopped the device around to various military divisions. The plans for the laser were never found after Tesla's death.

4. Robotics
Tesla imagined that, in the future, a race of robots "would be able to perform labor safely and effectively," says io9's Davis. In 1898, he demonstrated a radio-controlled boat he'd invented, which many credit as "being the birth of robotics." He envisioned a world filled with "intelligent cars, robotic human companions, [various] sensors, and autonomous systems."

5. Earthquake machine
"In 1898, Tesla claimed he had built and deployed a small oscillating device that, when attached to his office and operating, nearly shook down the building and everything around it," says Shea Gunther at Revmodo. The device weighed just a few pounds, but Tesla was able to tune the timing of the oscillator at such a frequency that each little vibration added just a little more energy to the wave of flex in the building. "Given enough little pushes, even the largest structure could be shaken apart." Realizing the potential terrors such a device could create, "Tesla said he took a hammer to the oscillator to disable it, instructing his employees to claim ignorance to the cause of the tremors if asked."

Source, Maximum PC, RSNA.org, An Engineer's Aspect, io9, Activist Post, Revmodo


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Monday, April 23, 2012

Top 10 DIY Food Geek Projects


Top 10 DIY Food Geek Projects

Kevin Purdy @ Lifehacker posts:
The best-tasting food is the kind that comes from your own efforts, because victory tastes oh-so-sweet. Conquer KFC-style fried chicken, smoky barbecue, wood-fired pizza, five-minute bread, and other DIY delicacies with these great food-focused projects.
Photo from The Pizza Hacker.
We've previously tackled 10 clever kitchen repurposing tricks and food and drink hacks, but this here is a compendium of more involved, fare more awesome projects that actually create food and drinks you can brag about.

10. Put Your Chicken on a "Throne" for Crispy Skin and Moist Meat

It's a pretty light project, but you certainly get your hands dirty. Cooking chicken so that it's standing up, with a can of liquid inside its carcass, ensures that the skin gets the perfect kind of crisp you're looking for, but the inner meat stays juicy, thanks to the steam coming from the can. You can watch Christopher Walken—yep, that Christopher Walken—demonstrate a fancier indoor method in the video, or read up on how to make it on the grill.

9. Make Crispy Wings at Home in the Oven

Top 10 DIY Food Geek ProjectsChicken wings you get at the bar are crispy, but their sauce sticks right to them. Wings you make at home in the oven are slick, and you're lucky if half the sauce stays on. The solution? Baking powder, along with some overnight, open-air refrigeration before cooking. You get healthier wings you can cook at home, and a great feeling of having somehow beaten the takeout economy. (Original post)

8. Brew Your Own Beer and Soda

Top 10 DIY Food Geek ProjectsYou'd think homebrew beer or soda would be a pretty huge undertaking, but it doesn't have to be. Starting out with either project is nothing more than a weekend afternoon spent with some beginner's materials. Guided tours and cost analyses of DIY brew are provided by the Wise Bread and The Simple Dollar, while a great video on making your own 2-liter soda experiments is offered at Howcast. (Original posts: beer, soda).

7. Fry Some KFC-Style Chicken at Home

Top 10 DIY Food Geek ProjectsThe Colonel's 11 secret herbs and spices do a good enough job when you want the bucket, but if you want the good stuff at home—or you're not a huge fan of MSG—you can pick up the mix provided by the Guardian UK's Word of Mouth blog. Many testers claim it to provide the same kind of mouth-filling feeling as the KFC's version, though if you disagree, the theoretically secret recipe is offered at the post, too, coming from Ron Douglas' America's Most Wanted Recipes. (Original post)

6. Make Fresh Bread Without a Bread Maker

Top 10 DIY Food Geek ProjectsFirst came the no-knead bread, and it was declared good. Then there came faster and whole wheat remixes, and it couldn't seem to get better. But then came another no-bread-machine-needed recipe, a mix-once, break-off-and-bake dough recipe that our own Jason tested and loved, and then a recipe that rises while you're at work for about a minute of prep time. There is nothing quite like fresh-baked bread, and that's all we have to say on that. (Original posts: no-knead, faster and whole wheat, five minutes, one-minute).
Continue reading here...


Tuesday, September 13, 2011

New combination of nanoparticles and graphene results in a more durable catalytic material for fuel cells

Mary Beckman, PNNL [Source]

Bracing catalyst in material makes fuel cell component work better and last longer

Triple Junction

A nanoparticle of indium tin oxide (green and red) braces platinum nanoparticles (blue) on the surface of graphene (black honeycomb) to make a hardier, more chemically active fuel cell material. A new combination of nanoparticles and graphene results in a more durable catalytic material for fuel cells, according to work published today online at the Journal of the American Chemical Society. The catalytic material is not only hardier but more chemically active as well. The researchers are confident the results will help improve fuel cell design.

"Fuel cells are an important area of energy technology, but cost and durability are big challenges," said chemist Jun Liu. "The unique structure of this material provides much needed stability, good electrical conductivity and other desired properties."

Liu and his colleagues at the Department of Energy's Pacific Northwest National Laboratory, Princeton University in Princeton, N.J., and Washington State University in Pullman, Wash., combined graphene, a one-atom-thick honeycomb of carbon with handy electrical and structural properties, with metal oxide nanoparticles to stabilize a fuel cell catalyst and make it better available to do its job.

"This material has great potential to make fuel cells cheaper and last longer," said catalytic chemist Yong Wang, who has a joint appointment with PNNL and WSU. "The work may also provide lessons for improving the performance of other carbon-based catalysts for a broad range of industrial applications."

Muscle Metal Oxide

Fuel cells work by chemically breaking down oxygen and hydrogen gases to create an electrical current, producing water and heat in the process. The centerpiece of the fuel cell is the chemical catalyst — usually a metal such as platinum — sitting on a support that is often made of carbon. A good supporting material spreads the platinum evenly over its surface to maximize the surface area with which it can attack gas molecules. It is also electrically conductive.

Fuel cell developers most commonly use black carbon — think pencil lead — but platinum atoms tend to clump on such carbon. In addition, water can degrade the carbon away. Another support option is metal oxides — think rust — but what metal oxides make up for in stability and catalyst dispersion, they lose in conductivity and ease of synthesis. Other researchers have begun to explore metal oxides in conjunction with carbon materials to get the best of both worlds.

As a carbon support, Liu and his colleagues thought graphene intriguing. The honeycomb lattice of graphene is porous, electrically conductive and affords a lot of room for platinum atoms to work. First, the team crystallized nanoparticles of the metal oxide known as indium tin oxide — or ITO — directly onto specially treated graphene. Then they added platinum nanoparticles to the graphene-ITO and tested the materials.

Platinumweight

The team viewed the materials under high-resolution microscopes at EMSL, DOE's Environmental Molecular Sciences Laboratory on the PNNL campus. The images showed that without ITO, platinum atoms clumped up on the graphene surface. But with ITO, the platinum spread out nicely. Those images also showed catalytic platinum wedged between the nanoparticles and the graphene surface, with the nanoparticles partially sitting on the platinum like a paperweight.

To see how stable this arrangement was, the team performed theoretical calculations of molecular interactions between the graphene, platinum and ITO. This number-crunching on EMSL's Chinook supercomputer showed that the threesome was more stable than the metal oxide alone on graphene or the catalyst alone on graphene.

But stability makes no difference if the catalyst doesn't work. In tests for how well the materials break down oxygen as they would in a fuel cell, the triple-threat packed about 40% more of a wallop than the catalyst alone on graphene or the catalyst alone on other carbon-based supports such as activated carbon.

Last, the team tested how well the new material stands up to repeated usage by artificially aging it. After aging, the tripartite material proved to be three times as durable as the lone catalyst on graphene and twice as durable as on commonly used activated carbon. Corrosion tests revealed that the triple threat was more resistant than the other materials tested as well.

The team is now incorporating the platinum-ITO-graphene material into experimental fuel cells to determine how well it works under real world conditions and how long it lasts.


Reference: Rong Kou, Yuyan Shao, Donghai Mei, Zimin Nie, Donghai Wang, Chongmin Wang, Vilayanur V Viswanathan, Sehkyu Park, Ilhan A. Aksay, Yuehe Lin, Yong Wang, Jun Liu, Stabilization of Electrocatalytic Metal Nanoparticles at Metal-Metal Oxide-Graphene Triple Junction Points, February 8, 2011, J. Am. Chem. Soc., DOI 10.1021/ja107719 (http://pubs.acs.org/doi/full/10.1021/ja107719u.

This work was supported by the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy.

Wednesday, August 31, 2011

X-Men Family Tree [Infographic]

Cool Looking Infographics about the relationships between the different x-men, can you identify them all? I couldn't....

via