World’s most sensitive thermometer made from light

By exploiting the difference between the speed of two different beams of colored light when traveling through a heated crystalline disk, University of Adelaide researchers claim to have produced the world’s most sensitive thermometer – with an accuracy of 30 billionths of a degree.
The thermometer works by using a laser to inject red and green light into a highly polished crystalline disk. As the refractive index (basically, how much the light is bent) of the crystal is dependent upon the ambient temperature, the two colors travel at slightly different speeds in the crystal and the researchers are able to measure that minute speed difference and extrapolate a very accurate temperature reading.
“By forcing the light to circulate thousands of times around the edge of this disk in the same way that sound concentrates and reinforces itself in a curve in a phenomena known as a ‘whispering gallery’ – as seen in St Paul’s Cathedral in London – we can measure this minuscule difference in speed with great precision,” said Professor Andre Luiten, Chair of Experimental Physics in IPAS and the School of Chemistry and Physics.
A “whispering gallery” is usually a circular or hemispherical structure where whispered acoustic communication is possible from any part of the internal circumference to any other part because waves form on the walls to carry the sound around. This phenomenon also exists for light, so the University of Adelaide team has taken advantage of this resonance to concentrate the beams around a disk.
Claimed to be three times more precise than any other thermometer currently available, the researchers from the school’s Institute for Photonics and Advanced Sensing (IPAS) are hopeful that the new technique could be redesigned to take a myriad other ultra-sensitive measurements including pressure, humidity, force, or looking for a specific chemical.
“Being able to measure many different aspects of our environment with such a high degree of precision, using instruments small enough to carry around, has the capacity to revolutionize technologies used for a variety of industrial and medical applications where detection of trace amounts has great importance,” Professor Luiten added.
According to the team, it was also able to control active suppression of temperature fluctuations in the system by controlling the intensity of the driving laser to further enhance the accuracy of the temperature readings.
The research has been published in the journal Physical Review Letters.

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Lasers could be used to detect drunk drivers

It used to be that the only way you could get a speeding ticket was if a police officer personally witnessed your overly-fast driving. Then photo radar came along. Well, when it comes to drunk driving, lasers could soon be the equivalent of photo radar. Polish researchers at the Military University of Technology in Warsaw have demonstrated how the high-intensity beams of light can be used to detect the presence of alcohol – even exhaled alcohol – in passing vehicles.
The scientists used a type of stand-off detection, the general term for the ability to identify substances at a distance. Typically, it’s used to detect things such as explosives or other hazardous materials, without getting dangerously close to them.
In this particular case, a laser was shone through a car’s cabin via its windows, onto a mirror located on the other side of the car, and then reflected back through the windows to a photodetector. Inside the car, alcohol vapor was emitted into the air, in a concentration similar to what would be exhaled by someone with a blood alcohol level of 0.1 percent.
By analyzing the reflected laser light, it was possible to determine how much of the original beam had been absorbed by alcohol vapor in the vehicle’s cabin. This in turn allowed the scientists to accurately deduce the amount of alcohol in the air.
The idea is that from there, an automated system could snap a photo of the car showing its license plate number, which would then be transmitted to police waiting down the road. Officers could then pull the car over and subject the driver to a breathalyzer test. The system could not simply issue a ticket based on the laser reading, as the alcohol vapor could be coming only from passengers in the car, or from spilled alcohol.
It’s definitely possible that drunk drivers could thwart the system by keeping their windows rolled down to air out the cabin, or by placing laser-blocking items on the window glass. In those cases, however, the system could still alert officers to the fact that those vehicles might be ones to check out.
The scientists are now in the process of optimizing the technology for commercialization by making it more compact, robust and user-friendly.
A paper on their research was recently published in the Journal of Applied Remote Sensing.

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Lasers could be used to detect drunk drivers

It used to be that the only way you could get a speeding ticket was if a police officer personally witnessed your overly-fast driving. Then photo radar came along. Well, when it comes to drunk driving, lasers could soon be the equivalent of photo radar. Polish researchers at the Military University of Technology in Warsaw have demonstrated how the high-intensity beams of light can be used to detect the presence of alcohol – even exhaled alcohol – in passing vehicles.
The scientists used a type of stand-off detection, the general term for the ability to identify substances at a distance. Typically, it’s used to detect things such as explosives or other hazardous materials, without getting dangerously close to them.
In this particular case, a laser was shone through a car’s cabin via its windows, onto a mirror located on the other side of the car, and then reflected back through the windows to a photodetector. Inside the car, alcohol vapor was emitted into the air, in a concentration similar to what would be exhaled by someone with a blood alcohol level of 0.1 percent.
By analyzing the reflected laser light, it was possible to determine how much of the original beam had been absorbed by alcohol vapor in the vehicle’s cabin. This in turn allowed the scientists to accurately deduce the amount of alcohol in the air.
The idea is that from there, an automated system could snap a photo of the car showing its license plate number, which would then be transmitted to police waiting down the road. Officers could then pull the car over and subject the driver to a breathalyzer test. The system could not simply issue a ticket based on the laser reading, as the alcohol vapor could be coming only from passengers in the car, or from spilled alcohol.
It’s definitely possible that drunk drivers could thwart the system by keeping their windows rolled down to air out the cabin, or by placing laser-blocking items on the window glass. In those cases, however, the system could still alert officers to the fact that those vehicles might be ones to check out.
The scientists are now in the process of optimizing the technology for commercialization by making it more compact, robust and user-friendly.
A paper on their research was recently published in the Journal of Applied Remote Sensing.

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Acoustic tractor beam pulls in macroscopic objects

The tractor beam is a staple of science fiction. Aliens use them to haul up unwilling earthlings into flying saucers for probing, and spacecraft use them to seize enemy ships or tow captured objects around in space. Now a group of researchers working at the University of Dundee actually claim to have built one. But instead of lasers, it uses ultrasonic waves to pull macroscopic objects in.
Working in cooperation with colleagues from Southampton University and Illinois Wesleyan University, the team used an ultrasound array to direct energy behind an object to exert force upon it and drag it towards the energy source. Using an ultrasound device clinically approved for use in MRI-guided focused ultrasound surgery, the team was able to move surprising large objects of approximately 1 cm in size.
“We were able to show that you could exert sufficient force on an object around one centimeter in size to hold or move it, by directing twin beams of energy from the ultrasound array towards the back of the object,” said Dr Christine Demore of the Institute for Medical Science and Technology (IMSAT) at Dundee. “This is the first time anyone has demonstrated a working acoustic tractor beam and the first time such a beam has been used to move anything bigger than microscopic targets.”
The object targeted by the acoustic tractor beam was triangular in shape, which allowed the researchers to use the effects of “nonconservative” forces (in this case, friction), to be overcome by directing ultrasonic beams of equal power and angle of incidence at the sides of the object. As they were deflected, they exerted a pressure behind the object, thereby pushing it toward the ultrasonic energy source.
And it isn’t just tractor beams the team has been working on either. In collaboration with Dr Gabe Spalding from Illinois Wesleyan University, the Dundee researchers have previously demonstrated that Dr Who’s “sonic screwdriver” could also be created using a comparable ultrasonic array pointed at an object to push it away as well as make it spin.
Lasers have previously been used by other researchers to create tractor beams, but their influence has so far been limited to the microscopic level.NASA is also conducting experiments in this field, but the University of Dundee acoustic tractor beam seems to be the first one so far to move objects of a significant size.
The work was carried out as part of the “Electronic Sonotweezers: Particle Manipulation with Ultrasonic Arrays” program initiated by the Engineering and Physical Sciences Research Council (EPSRC).
The results of their research have been published in the journal Physical Review Letters.
Source: The University of Dundee

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Cloaked DNA devices evade the body’s immune system

Researchers from Harvard University’s Wyss Institute for Biologically Inspired Engineering have developed a cloaked DNA nanodevice capable of evading the body’s immune defenses. The design was inspired by real world viruses and could be used to diagnose cancer and better target treatments to specific areas of tissue.
The researchers used a method known as “DNA origami” to construct the nanoscale device. This method involves folding a long strand of DNA into three-dimensional shapes and programming them to carry molecular instructions to specific cells. In 2012, researchers from Wyss demonstrated the potential of this approach by constructing a barrel-shaped robotic device, loading it with an antibody and programming it to hone in on leukemia and lymphoma cells. Once located, the antibody activated the cells’ “suicide switch,” causing them to self-destruct through what is known as apoptosis.
While this delivery mechanism could prove useful in treating a variety of diseases, one significant obstacle is that in testing, the nanorobots are quickly digested after being injected into the bloodstream of mice. This led the researchers at Wyss to explore how they could prevent the particles from being chewed up before performing their task.
“We suspected that a virus-like envelope around our particles could solve our problem,” says Wyss Institute Core Faculty member and lead author of the study, William Shih, Ph.D.
The team set about replicating a type of virus that protects its genome using a solid protein casing and layer of oily coating. Within this coating is a double layer of phospholipid, a lipid containing phosphate that helps viruses to evade the immune system.
In testing the resilience of the nanodevices in the body, the team loaded them with fluorescent dye and injected them into mice, some with the phospholipid coating and some without. The uncoated devices were quickly broken down, with whole-body imaging revealing a concentrated glow in the bladder. Those receiving the coated version showed a full-bodied glow, indicating that the devices remained in the bloodstream for hours after being injected.
The team also observed a link between the presence of the coated nanodevices in the bloodstream and activation of the immune system. Two particular immune-activating molecules were found to be 100-fold lower in mice administered the coated devices as opposed to those given the uncoated versions.
Such manipulation of the immune system could prove beneficial for treating certain conditions, such as activating the immune system to fight cancer cells or conversely, suppressing it to allow transplanted tissue to become established. Despite these potential applications, the researchers are mindful of the potential for adverse effects.
“Activating the immune response could be useful clinically or it might be something to avoid,” says Steve Perrault, Ph.D., a Wyss Institute Technology Development fellow. “The main point is that we can control it.”
The team’s research was published in the journal ACS Nano.
You can hear more about the cloaked nanodevices from the researchers in the video below.

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Will superhuman powers give us superhuman problems

Any mention of cyborgs or superpowers evokes fantastical images from the realms of science fiction and comic books. Our visions of humans with enhanced capabilities are borne of our imaginations and the stories we tell. In reality, though, enhanced humans already exist … and they don’t look like Marvel characters. As different human enhancement technologies advance at different rates, they bleed into society gradually and without fanfare. What’s more, they will increasingly necessitate discussion about areas that are often overlooked – what are the logistics and ethics of being superhuman? Gizmag spoke to a number of experts to find out.

Our natural tendency is to focus on the functionality of enhanced humans. Abilities like super-strength, flight or telepathy seem so far removed from that of which we’re capable and so desirable that it’s understandable for us to focus on these possibilities. The individual, social and ethical consequences of enhanced humans are considered far less in popular culture, however.
“People tend to imagine the current state of human enhancement as either much more advanced or retarded than it really is,” Steve Fuller, Auguste Comte Chair in Social Epistemology in the Department of Sociology at the University of Warwick, tells Gizmag. “I realize that this sounds paradoxical, but generally speaking it helps to explain the curious blend of impatience and disappointment that surrounds the topic. This simply reflects the fact that people know more about human enhancement from its own hype and science-fictional representations – which can be positive or negative – than from what’s actually available on the ground.”
Professor Andy Miah, director of the Creative Futures Institute at the University of the West of Scotland, has spent much of his career looking at the potential for human enhancement and what it might mean for us. Speaking to Gizmag, he explains that enhancement is not a new phenomenon, but that, increasingly, we have important decisions that will have to be made.
Miah argues that as society becomes more advanced, more and more difficult decisions surrounding human enhancement will be thrust upon us. “I thinks it’s inevitable that we will have to make these decisions,” he says, explaining that the only other option would be to halt human progress with an archetypal head-in-the-sand scenario.

Trade-offs

The issues that society will have to consider range from straightforward personal issues to highly complex and abstract social issues. Beginning with the more personal considerations, Miah uses the example of super-strength. “In order for that, you are going to need added muscle mass, which will likely compromise your potential for speed and agility,” he says. It’s a simple proposition used to show that any enhancement is likely to have side-effects.
Kevin Warwick, Professor of Cybernetics at the University of Reading, tells Gizmag that it will be important for people to consider what they are getting themselves into and what exactly they want to achieve. “The nature of the enhancement will take on dramatically different forms,” he explains. “Has anyone done it before? It could be dangerous; could go wrong. There could be side effects that we know little or nothing about.”
Another example is provided by social psychologist Bertolt Meyer in a recent Wired article. Meyer, who was born without his lower left arm, asks whether people would have a limb amputated to replace it with a prosthesis that was to some extent better. Even now, though, he notes a potential trade-off. “Augmented bodies that contain connected technology give the word hacking a new meaning,” he says in the article. “My i-limb connects to my iPhone, but my iPhone is connected to the internet. Technically, a part of my body has become hackable.”
Fuller agrees that such unintended consequences are the main consideration required when thinking about enhancement. “If, say, your memory is successfully enhanced, consider how else this might change your way of living and your relationship with people.” Warwick reiterates this point by asking, “With superintelligence, what would the enhanced folk do with the stupid unenhanced?”.

Social impacts

This application of practicality places the idea of human enhancement under a whole new light compared to its presentation in popular culture. It provides an instant recognition that being bestowed with a “super-power” is unlikely to come without its costs. Furthermore, it only complicates matters when considered on a larger scale.
Miah poses the question of what impact life-extension will have on society. We are already living longer and, already, there is a strain being placed on society. Care, pensions and housing are all impacted by aging populations. So what if we had the option of living to 200? 500? 1000? Trying to conceive how this might impact society requires a huge speculative leap, says Miah.
The issues aren’t limited to the present time or to immediate consequences, however. Society also has to consider the potential consequences for future generations of modifying humans today. “If we find out how to remove a specific gene to cure a disease, we may find that in 200 years time that gene is hugely important for another reason,” Miah explains.
Similarly, he poses another lateral ethical dilemma. “If we develop the ability to improve our own intelligence,” he asks, “do we have a responsibility to do so for animals too? That would completely change our view of animals and animal rights.” Although radical, this concept is not that far-fetched. India recently gave dolphins “non-human person” status, recognizing their high intelligence and providing them with specific rights.

Considerations

The main social considerations for enhancement technology, Fuller suggests, are ensuring their equitable distribution, so that priority is given to those for whom enhancement serves to reduce already existing inequalities rather than increasing them, and the extent to which we will tolerate personal enhancement.
“We are effectively encouraging people to experiment with all sorts of modes of being – involving transgenic and prosthetic implants – that could easily result in a diversity of capacities previously unseen in human history,” says Fuller, “some of which are likely to incorporate some measure of what we now call disability.”
Almost counter-intuitively, Fuller also points out that we would have to consider the place of people who, for religious or other reasons, refuse to be enhanced, however legal or safe. Is it fair to leave people behind or put them at a disadvantage simply because they opt-out of a post-human world?

Future enhancement

Fuller says he agrees with the transhumanist idea that we need to take greater risks with our bodies and our environments in order to flourish in the long term, but believes that we must have legal, social, political and economic safeguards in place. He is keen for state and international agencies to become actively involved to ensure that the enhancement market is appropriately regulated and doesn’t exacerbate the social problems we already have. While he points out that such intervention can’t always be relied upon, Fuller suggests that advancement of the technology is likely to happen regardless.
“Generally speaking, even if states end up being either very laissez-faire or prohibitive in their approach to these new technologies, they will happen by other means, i.e. outside the jurisdiction of the state,” predicts Fuller. “A good case in point is seasteading.org, a floating vessel outside of territorial waters that is designed to house research for doing challenging science that is currently not allowed by over-restrictive ethics panels at universities.”
Warwick suggests that, despite the minefield of ethical dilemmas to be navigated and potential for individuals with increasingly varied capabilities, the market is likely to develop much like any other. “[The future of human enhancement probably involves] initially exciting, pioneering experimentation over the next few years,” he predicts. “Then lots of commercial opportunities opening up.”
For more information: Andy MiahSteve FullerKevin Warwick

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Microstructured materials as strong as steel yet less dense than water

Researchers in Germany have developed a lightweight, high-strength material inspired by the framework structure of bones and wood and the shell structure of bees’ honeycombs. Created using 3D laser polymer printing combined with a ceramic coating, the material is less dense than water but, relative to its size, boasts strength comparable to high-performance steel or aluminum.Although inspired by nature, the polymer microarchitecture produced by a team at the Karlsruhe Institute of Technology (KIT) outperforms its natural counterparts in terms of strength/density ratio. The underlying structure was produced using a process of 3D laser lithography or polymer printing and hardening.

A number of structures were tested, including triangular, hexagonal and honeycomb. These were then coated by gas deposition to provide extra strength, with coatings of a ceramic material and alumina both tested. The polymer structure measured roughly 50 µm long, wide, and high, while various coating thicknesses were tested ranging from 10 nm to 200 nm.
It was found that a honeycomb polymer structure with an alumina coating of 50 nm yielded the highest stability to density ratio. This microarchitecture outperformed the triangular and hexagonal counterparts produced and tested, while no additional strength was achieved after a coating thickness of 50 nm of alumina was exceeded. This optimized honeycomb structure failed at a pressure of 28 kg/mm2, yet only had a density of 810 kg/m3, which the team says exceeds the stability/density ratio of bones, massive steel or aluminum.
“The novel lightweight construction materials resemble the framework structure of a half-timbered house with horizontal, vertical, and diagonal struts,” said study co-author Jens Bauer. “Our beams, however, are only 10 µm in size.”
The team says microstructured materials are often used for insulation or as shock absorbers, and that such open-pore materials can be used as filters in the chemical industry.
The team’s results have been published in the journal Proceedings of the National Academy of Sciences.

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