The researchers found a way to make an “optical battery,” said Stephen Rand, a professor in the departments of Electrical Engineering and Computer Science, Physics and Applied Physics.
In the process, they overturned a century-old tenet of physics.
“You could stare at the equations of motion all day and you will not see this possibility. We’ve all been taught that this doesn’t happen,” said Rand, an author of a paper on the work published in the Journal of Applied Physics. “It’s a very odd interaction. That’s why it’s been overlooked for more than 100 years.”
Light has electric and magnetic components. Until now, scientists thought the effects of the magnetic field were so weak that they could be ignored. What Rand and his colleagues found is that at the right intensity, when light is traveling through a material that does not conduct electricity, the light field can generate magnetic effects that are 100 million times stronger than previously expected. Under these circumstances, the magnetic effects develop strength equivalent to a strong electric effect.
“This could lead to a new kind of solar cell without semiconductors and without absorption to produce charge separation,” Rand said. “In solar cells, the light goes into a material, gets absorbed and creates heat. Here, we expect to have a very low heat load. Instead of the light being absorbed, energy is stored in the magnetic moment. Intense magnetization can be induced by intense light and then it is ultimately capable of providing a capacitive power source.”
What makes this possible is a previously undetected brand of “optical rectification,” says William Fisher, a doctoral student in applied physics. In traditional optical rectification, light’s electric field causes a charge separation, or a pulling apart of the positive and negative charges in a material. This sets up a voltage, similar to that in a battery. This electric effect had previously been detected only in crystalline materials that possessed a certain symmetry.
Rand and Fisher found that under the right circumstances and in other types of materials, the light’s magnetic field can also create optical rectification.
“It turns out that the magnetic field starts curving the electrons into a C-shape and they move forward a little each time,” Fisher said. “That C-shape of charge motion generates both an electric dipole and a magnetic dipole. If we can set up many of these in a row in a long fiber, we can make a huge voltage and by extracting that voltage, we can use it as a power source.”
The light must be shone through a material that does not conduct electricity, such as glass. And it must be focused to an intensity of 10 million watts per square centimeter. Sunlight isn’t this intense on its own, but new materials are being sought that would work at lower intensities, Fisher said.
“In our most recent paper, we show that incoherent light like sunlight is theoretically almost as effective in producing charge separation as laser light is,” Fisher said.
This new technique could make solar power cheaper, the researchers say. They predict that with improved materials they could achieve 10 percent efficiency in converting solar power to useable energy. That’s equivalent to today’s commercial-grade solar cells.
“To manufacture modern solar cells, you have to do extensive semiconductorprocessing,” Fisher said. “All we would need are lenses to focus the light and a fiber to guide it. Glass works for both. It’s already made in bulk, and it doesn’t require as much processing. Transparent ceramics might be even better.”
In experiments this summer, the researchers will work on harnessing this power with laser light, and then with sunlight.
The paper is titled “Optically-induced charge separation and terahertz emission in unbiased dielectrics.” The university is pursuing patent protection for the intellectual property.
Despite shifting into higher gear within the consumer's green conscience, hybrid vehicles are still tethered to the gas pump via a fuel-thirsty 100-year-old invention: the internal combustion engine.
However, researchers at Michigan State University have built a prototype gasoline engine that requires no transmission, crankshaft, pistons, valves, fuel compression, cooling systems or fluids. Their so-called Wave Disk Generator could greatly improve the efficiency of gas-electric hybrid automobiles and potentially decrease auto emissions up to 90 percent when compared with conventional combustion engines.
The engine has a rotor that's equipped with wave-like channels that trap and mix oxygen and fuel as the rotor spins. These central inlets are blocked off, building pressure within the chamber, causing a shock wave that ignites the compressed air and fuel to transmit energy.
The Wave Disk Generator uses 60 percent of its fuel for propulsion; standard car engines use just 15 percent. As a result, the generator is 3.5 times more fuel efficient than typical combustion engines.
Researchers estimate the new model could shave almost 1,000 pounds off a car's weight currently taken up by conventional engine systems.
Last week, the prototype was presented to the energy division of the Advanced Research Projects Agency, which is backing the Michigan State University Engine Research Laboratory with $2.5 million in funding.
Michigan State's team of engineers hope to have a car-sized 25-kilowatt version of the prototype ready by the end of the year.
© 2011 Discovery Channel
Last month in the House, the newly empowered GOP majority voted down a resolution stating simply that global warming was real: they've apparently decided to go with their own versions of physics and chemistry.
This week in the Senate, the biggest environmental groups were reduced to a noble, bare-knuckles fight merely to keep the body from gutting the Clean Air Act, the proudest achievement of the green movement. The outcome is still unclear; even several prominent Democrats are trying to keep the EPA from regulating greenhouse gases.
And at the White House? The president who boasted that his election marked the moment when 'the oceans begin to recede' instead introduced an energy plan heavy on precisely the carbon fuels driving global warming. He focused on 'energy independence,' a theme underscored by his decision to open 750 million tons of Wyoming coal to new mining leases. That's the equivalent of running 3,000 new power plants for a year.
Here's what we think is going on, in the broadest terms.
The modern environmental movement was born on Earth Day 1970, in an unprecedented burst of mass organizing--by some estimates 20 million Americans, a tenth of the population, took to the streets. It was a young movement, at a time when large numbers of people were serious about not just cleaning the air but stopping wars and ending official discrimination. That popular base inspired--or, more likely, cowed--Washington: the next four years saw the passage of virtually all the environmental legislation that still forms the core of green law.
It also saw the birth or rebirth of many of the organizations we think of when we think of environmentalism. Powered by that initial burst of mass support, they were able to make real headway in DC, and so they concentrated on important and professional tasks: patient lobbying of subcommittees, careful report-writing. And they kept making substantial gains: Superfund toxic cleanups, acid-rain control.
But in recent years two things have happened. One, that battery wound up on the first Earth Day has finally wound down: congressmen, it turns out, can tell the difference between an aging membership list and a vibrant political movement. As the DC political bible Politico put it last month: "green groups are being forced to play defense in a world where D.C. pols aren't scared of them."
Second, the key issue has changed. Forget acid rain and Superfund; these were important but relatively easy fights that didn't directly confront anyone's business model. You could clean up acid rain by putting a filter on your power plant. But global warming is different--you'd have to shut down that power plant, and replace it with a windmill or a solar panel.
And so the full power of the fossil fuel industry--the most profitable business in the planet's history--has been brought to bear on the fight, and they play hard and dirty. The Koch Brothers spend huge sums to underwrite the network of global warming skeptics; the US Chamber of Commerce emerged as the biggest campaign funder of them all, shuttling 94% of its donations to climate deniers. This kind of clout carried the day: the biggest dream of DC Washington groups was the so-called 'cap-and-trade' bill, behind which they mustered every insider technique they'd spent the last four decades perfecting. But in the end they didn't come close: Harry Reid refused to even schedule a floor vote, knowing that he was far short of the votes needed to pass the bill. The White House stayed on the sidelines.
To us, the lesson is pretty clear. Since we're never going to have as much money as the fossil fuel industry, we need to rebuild the kind of mass movement that marked 1970: bodies, passion, and creativity are the currencies we can compete in. It's not impossible. Working with next to no money, the fledgling campaign at 350.org managed over the last three years to coordinate 15,000 rallies in 189 countries--every nation on earth save North Korea. It's been active in every US state and Congressional district. And this week, it combined forces with another important American grass roots climate campaign, 1Sky, for extra reach.
1Sky was founded in the same spirit, and at the same time, as 350.org, and has worked to develop leaders around the country and help build a base of hundreds allies. Together, we'll be smarter, bolder, faster, and more creative than we were before.
This new and expanded 350.org will mobilize on a large scale--circle Sept. 24 on your calendar for a worldwide day of bike-based action. But it's also going aggressively after the backroom money, with a far-reaching new campaign that tackles the US Chamber of Commerce for its climate stance.
This youth-based campaign is linking up with labor, with faith communities, with frontline communities who have the most experience trying to shut down dirty power plants in their backyards. Most of all it's actually out in the streets, organizing new blood. The idea is not to supplant the Washington green groups, but instead to give the whole movement new clout--enough clout to withstand the crushing power of oil money. And enough energy to let us get off defense and back on the attack.
We don't know if we'll win in the end: the science of climate change grows darker by the day, and the window for effective action is swiftly closing. But any chance requires people power replacing corporate power. In the year of Tunisia and Egypt and Wisconsin, it's worth a try.
USDA senior scientist sends “emergency” warning to US Secretary of Agriculture Tom Vilsack on a new plant pathogen in Roundup Ready GM soybean and corn that may be responsible for high rates of infertility and spontaneous abortions in livestock Dr. Mae-Wan Ho
An open letter appeared on the Farm and Ranch Freedom Alliance founded and run by Judith McGeary to save family farms in the US [1, 2]. The letter, written by Don Huber, professor emeritus at Purdue University, to Secretary of Agriculture Tom Vilsack, warns of a pathogen “new to science” discovered by “a team of senior plant and animal scientists”. Huber says it should be treated as an “emergency’’, as it could result in “a collapse of US soy and corn export markets and significant disruption of domestic food and feed supplies.”
The letter appeared to have been written before Vilsack announced his decision to authorize unrestricted commercial planting of GM alfalfa on 1 February, in the hope of convincing the Secretary of Agriculture to impose a moratorium instead on deregulation of Roundup Ready (RR) crops.
The new pathogen appears associated with serious pervasive diseases in plants - sudden death syndrome in soybean and Goss' wilt in corn – but its suspected effects on livestock is alarming. Huber refers to “recent reports of infertility rates in dairy heifers of over 20%, and spontaneous abortions in cattle as high as 45%.”
This could be the worst nightmare of genetic engineering that some scientists including me have been warning for years [3] (see Genetic Engineering Dream or Nightmare, ISIS publication): the unintended creation of new pathogens through assisted horizontal gene transfer and recombination.
Huber writes in closing: “I have studied plant pathogens for more than 50 years. We are now seeing an unprecedented trend of increasing plant and animal diseases and disorders. This pathogen may be instrumental to understanding and solving this problem. It deserves immediate attention with significant resources to avoid a general collapse of our critical agricultural infrastructure.”
The complete letter is reproduced below.
| Dear Secretary Vilsack: A team of senior plant and animal scientists have recently brought to my attention the discovery of an electron microscopic pathogen that appears to significantly impact the health of plants, animals, and probably human beings. Based on a review of the data, it is widespread, very serious, and is in much higher concentrations in Roundup Ready (RR) soybeans and corn-suggesting a link with the RR gene or more likely the presence of Roundup. This organism appears NEW to science! This is highly sensitive information that could result in a collapse of US soy and corn export markets and significant disruption of domestic food and feed supplies. On the other hand, this new organism may already be responsible for significant harm (see below). My colleagues and I are therefore moving our investigation forward with speed and discretion, and seek assistance from the USDA and other entities to identify the pathogen's source, prevalence, implications, and remedies. We are informing the USDA of our findings at this early stage, specifically due to your pending decision regarding approval of RR alfalfa. Naturally, if either the RR gene or Roundup itself is a promoter or co-factor of this pathogen, then such approval could be a calamity. Based on the current evidence, the only reasonable action at this time would be to delay deregulation at least until sufficient data has exonerated the RR system, if it does. For the past 40 years, I have been a scientist in the professional and military agencies that evaluate and prepare for natural and manmade biological threats, including germ warfare and disease outbreaks. Based on this experience, I believe the threat we are facing from this pathogen is unique and of a high risk status. In layman's terms, it should be treated as an emergency. A diverse set of researchers working on this problem have contributed various pieces of the puzzle, which together presents the following disturbing scenario: Pathogen Location and Concentration Linked with Outbreaks of Plant Disease Implicated in Animal Reproductive Failure The pathogen may explain the escalating frequency of infertility and spontaneous abortions over the past few years in US cattle, dairy, swine, and horse operations. These include recent reports of infertility rates in dairy heifers of over 20%, and spontaneous abortions in cattle as high as 45%. For example, 450 of 1,000 pregnant heifers fed wheatlege experienced spontaneous abortions. Over the same period, another 1,000 heifers from the same herd that were raised on hay had no abortions. High concentrations of the pathogen were confirmed on the wheatlege, which likely had been under weed management using glyphosate. Recommendations It is urgent to examine whether the side-effects of glyphosate use may have facilitated the growth of this pathogen, or allowed it to cause greater harm to weakened plant and animal hosts. It is well-documented that glyphosate promotes soil pathogens and is already implicated with the increase of more than 40 plant diseases; it dismantles plant defenses by chelating vital nutrients; and it reduces the bioavailability of nutrients in feed, which in turn can cause animal disorders. To properly evaluate these factors, we request access to the relevant USDA data. I have studied plant pathogens for more than 50 years. We are now seeing an unprecedented trend of increasing plant and animal diseases and disorders. This pathogen may be instrumental to understanding and solving this problem. It deserves immediate attention with significant resources to avoid a general collapse of our critical agricultural infrastructure. |
1. “Researcher: Glyphosate (Roundup) or Roundup Ready Crops May Cause Animal Miscarriages”, Jill Richardson, La Vida Locavore, 18 February 2011
http://www.lavidalocavore.org/diary/4523
2. “Researcher: Glyphosate (Roundup) or Roundup Ready Crops May Cause Animal Miscarriages”, 18 February 2011, http://farmandranchfreedom.org/gmo-miscarriages
3. Ho MW. Genetic Engineering Dream of Nightmare? The Brave New World of Bad Science and Big Business, Third World Network, Gateway Books, MacMillan, Continuum, Penang, Malaysia, Bath, UK, Dublin, Ireland, New York, USA, 1998, 1999, 2007 (reprint with extended Introduction). http://www.i-sis.org.uk/genet.php
