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Markku I. Peltola
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Appliances, machines, gadgets, apps, widgets and gizmos. They shape our lives and most of us couldn't survive without them.
Latest Activity: Apr 5
Started by Davy Oct 20, 2013.
Started by Michel. Last reply by Onyango Makagutu Apr 21, 2013.
Started by Michel Mar 26, 2013.
Started by Michel Mar 22, 2013.
Started by Michel. Last reply by Chris Apr 13, 2013.
Started by Michel. Last reply by abbylee Jan 6, 2015.
Started by Marc. Last reply by Davy Dec 15, 2012.
Started by Michel. Last reply by Chris Nov 10, 2012.
Started by Doone. Last reply by Michel Dec 3, 2012.
Started by Michel. Last reply by Adriana Sep 14, 2012.
Electric powered bicycles are interesting. Both electric and small engines have been used on bicycles for more than a century.
This kit looks interesting:
at a cost of ~$160 USD. I wonder if it would be strong enough for a tricycle with a front and rear basket loaded with groceries, and/or other items.
The area I live in isn't bicycle (or foot traffic) friendly. The roads are too narrow and the traffic is too dense. There are a lot of tourists who don't know the roads and have visited wineries.
England has made some neat airplanes. The Harrier vertical take of and landing plane was way ahead of it's time. I think the Mosquito used during WWII was inovative.
Reporter Taking to the skies in a RAF Tornado in 360 Video- BBC News
Har har, har
Swarming gizmos may be more problematic.
Might be out of line, but Stephens post "Hey Budd, Cand you Give Me a Hiand?
Reminded me of the following By Yip Harburg - the songwriter for the Wizazard of Oz. - Who was black listed.
Doesn't mean much.
"We are all going to die"
What do you mean by O/P? Operational Parameters?
As you know transformers increase, or decrease AC voltage. Rectifiers convert AC to DC.
Perhaps it's a good idea to make the connectors different so people don't mistakenly plug their device into the wrong power supply. If they were interchangable it wouldn't matter.
It shouldn't be difficult to make a common power supply so different power supplies work from the same source to supply a variety of different devices. USB seems to have helped for small devices.
Other battery supplied devices still have 'proprietary' voltages and adapters such that they aren't interchangable.
This is where IEEE and other engineering standards may be helpful.
Chris What are the transformers used for?
What are their O/P's AC or DC? Are they bare trannies?
I have a box with about fifteen, or twenty transformers. Each provides a different voltage output with a different connector. Why hasn't the IEEE standardized this better?
Batteries made with asphalt can charge in 5 minutes
Lithium batteries made with asphalt could charge 10 to 20 times faster than the commercial lithium-ion batteries currently available. The researchers developed anodes comprising porous carbon made from asphalt that show exceptional stability after more than 500 charge-discharge cycles. A high-current density of 20 milliamps per square centimeter demonstrates the material’s promise for use in rapid charge and discharge devices that require high-power density. “The capacity of these batteries is enormous, but what is equally remarkable is that we can bring them from zero charge to full charge in five minutes, rather than the typical two hours or more needed with other batteries,” says James Tour, the chair in chemistry and a professor of computer science and of materials science and nanoengineering at Rice University. The Tour lab previously used a derivative of asphalt—specifically, untreated gilsonite, the same type used for the battery—to capture greenhouse gases from natural gas. This time, the researchers mixed asphalt with conductive graphene nanoribbons and coated the composite with lithium metal through electrochemical deposition. The lab combined the anode with a sulfurized-carbon cathode to make full batteries for testing. The batteries showed a high-power density of 1,322 watts per kilogram and high-energy density of 943 watt-hours per kilogram. Testing revealed another significant benefit: The carbon mitigated the formation of lithium dendrites. These mossy deposits invade a battery’s electrolyte. If they extend far enough, they short-circuit the anode and cathode and can cause the battery to fail, catch fire, or explode. But the asphalt-derived carbon prevents any dendrite formation. An earlier project by the lab found that an anode of graphene and carbon nanotubes also prevented the formation of dendrites. Tour says the new composite is simpler. “While the capacity between the former and this new battery is similar, approaching the theoretical limit of lithium metal, the new asphalt-derived carbon can take up more lithium metal per unit area, and it is much simpler and cheaper to make,” he says. “There is no chemical vapor deposition step, no e-beam deposition step, and no need to grow nanotubes from graphene, so manufacturing is greatly simplified.” The research appears in the journal ACS Nano. Rice graduate student Tuo Wang is lead author of the paper. Additional coauthors of the paper are from Rice University; the King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia; and Wuhan University, China. The Air Force Office of Scientific Research, EMD-Merck, and Prince Energy supported the research. Source: Rice University Original Study DOI: 10.1021/acsnano.7b05874
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