Archive for the ‘energy’ category: Page 243
Jun 12, 2018
Why fascism is so tempting — and how your data could power it
Posted by Derick Lee in categories: business, cybercrime/malcode, energy, holograms
In a profound talk about technology and power, author and historian Yuval Noah Harari explains the important difference between fascism and nationalism — and what the consolidation of our data means for the future of democracy. Appearing as a hologram live from Tel Aviv, Harari warns that the greatest danger that now faces liberal democracy is that the revolution in information technology will make dictatorships more efficient and capable of control. “The enemies of liberal democracy hack our feelings of fear and hate and vanity, and then use these feelings to polarize and destroy,” Harari says. “It is the responsibility of all of us to get to know our weaknesses and make sure they don’t become weapons.” (Followed by a brief conversation with TED curator Chris Anderson)
Check out more TED Talks: http://www.ted.com
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Jun 11, 2018
In desert trials, next-generation water harvester delivers fresh water from air
Posted by Bill Kemp in categories: energy, habitats, sustainability
Last October, a University of California, Berkeley, team headed down to the Arizona desert, plopped their newest prototype water harvester into the backyard of a tract home and started sucking water out of the air without any power other than sunlight.
The successful field test of their larger, next-generation harvester proved what the team had predicted earlier in 2017: that the water harvester can extract drinkable water every day/night cycle at very low humidity and at low cost, making it ideal for people living in arid, water-starved areas of the world.
“There is nothing like this,” said Omar Yaghi, who invented the technology underlying the harvester. “It operates at ambient temperature with ambient sunlight, and with no additional energy input you can collect water in the desert. This laboratory-to-desert journey allowed us to really turn water harvesting from an interesting phenomenon into a science.”
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Jun 11, 2018
Ultra-capacitor hybrid radically boosts power and efficiency of lithium batteries
Posted by Klaus Baldauf in categories: energy, transportation
Combining the unique strengths of lithium batteries with crazy-fast charging, carbon ultra-capacitors could save a ton of weight and add significant range and power to electric vehicles, according to Nawa Technologies. Based outside Marseilles, this fascinating French startup is working on a new type of battery it believes could offer some huge advantages in the EV space, among many others.
Jun 10, 2018
Berkeley’s desert water extractor is taking us one step closer to harvesting water out of thin air
Posted by Genevieve Klien in categories: energy, sustainability
Right now, there are roughly 16 sextillion liters of water suspended in the atmosphere. The air around you is a river, you just can’t see it.
Harvesting water from air would be a game-changing solution to tackling freshwater scarcity, which is increasing as the world warms. It would be especially vital in places with very little humidity in the air, like the desert. But while it’s technically possible—you just need to get the water content in the air to condense around something—doing so efficiently has been difficult, until now.
The challenge with this technology is cooling. Water vapor will only condense into a liquid if the material it condenses on is cooler than the surrounding air. That’s why droplets of condensation will appear on a soda can the moment you take it out of the fridge. But how do you leave a piece of machinery in the desert sun all day and keep it cooler than the surrounding air? One way would be to install a cooling system. But it takes a a lot of energy to perpetually cool an object in a hot place, and isn’t feasible in places where energy is expensive. We also don’t want to increase the amount of energy demand in a world already struggling to reduce emissions.
Jun 7, 2018
The decline of our oceans is accelerating, but it’s not too late to stop it
Posted by Nicholi Avery in categories: economics, energy, sustainability
We shouldn’t underestimate the powerful attraction of a ‘sustainable blue economy’, which – I firmly believe – will feed and support the lives of our children and those who come after them. Getting it right – whether through aquaculture, offshore energy, green shipping or ecotourism – is vital not just for SDG14, but for the future of the global commons, and for humankind itself. To do this we must move with purposeful steps. Here are five that could be taken immediately.
Curtail subsidies
Let us stop throwing good money after bad, and resolve to prohibit subsidies that support harmful and illegal fishing. A critical opportunity to eliminate them is looming at the 2019 ministerial meeting of the World Trade Organisation. It must not be missed.
Jun 6, 2018
Vela X-1 is plowing its way through the galaxy
Posted by Genevieve Klien in categories: energy, space
Every now and again you run into an astronomical object where everything about it is mind blowing. And I get to share it with you! Let me introduce you to a binary star that will crush your imagination and make you realize the Universe is way cooler than you knew.
A few million years ago, and 6,000 light years from Earth, two stars were born out of the gas and dust in the galaxy in a cluster with many other stars. These two formed together, so close their mutual and growing gravity bound them together, forcing them to orbit one another. And they grew huge: By the time they switched on and became true stars, they each had more than two dozen times the mass of the Sun.
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Jun 1, 2018
Engineers design new solid polymer electrolyte, paving way for safer, smaller batteries and fuel cells
Posted by Bill Kemp in categories: energy, satellites
Fuel cells and batteries provide electricity by generating and coaxing positively charged ions from a positive to a negative terminal which frees negatively charged electrons to power cellphones, cars, satellites, or whatever else they are connected to. A critical part of these devices is the barrier between these terminals, which must be separated for electricity to flow.
Improvements to that barrier, known as an electrolyte, are needed to make energy storage devices thinner, more efficient, safer, and faster to recharge. Commonly used liquid electrolytes are bulky and prone to shorts, and can present a fire or explosion risk if they’re punctured.
Research led by University of Pennsylvania engineers suggests a different way forward: a new and versatile kind of solid polymer electrolyte (SPE) that has twice the proton conductivity of the current state-of-the-art material. Such SPEs are currently found in proton-exchange membrane fuel cells, but the researchers’ new design could also be adapted to work for the lithium-ion or sodium-ion batteries found in consumer electronics.
