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Science & Technology News (645)

Impure Silicon Used to Create Solar Cell

Category: Science & Technology
Posted: October 24, 2014 07:16AM
Author: Guest_Jim_*

Many of the solar cells you can find today are made of ultra-pure silicon, which is a slight problem as such silicon is energy intensive and expensive to make. It is necessary though, for solar panels to efficiently generate electricity. However, researchers at the Norwegian University of Science and Technology have developed a way to create solar cells of a different geometry, made of less-pure silicon.

The new design borrows from fiber optic fabrication by coating silicon fibers in glass, and heating them both up. Once heated, the silicon will melt and the glass will soften enough that they can be stretched, forming a long, thin glass fiber with a silicon core. This process naturally purifies the silicon, be melting and re-solidifying it within the glass. These fibers can then be made into vertical rod radial-junction solar cells, with electrons in the silicon absorbing the energy from the light and being captured at the junction on the surface of the silicon. Planar solar cells, for contrast, must be made of ultra-pure silicon because of the distance the electrons must travel to reach a junction or electrode.

As this manufacturing approach is based on the technique for creating bulk silicon-core fibers, producing solar cells from dirty silicon this way would be rather cheap. The catch is that prototype has only achieved 3.6% efficiency, which is far below commercially available solar panels. Of course, that will change as the technology is further developed.

Source: Norwegian University of Science and Technology

Adaptive Zoom Brought to Riflescope

Category: Science & Technology
Posted: October 23, 2014 02:12PM
Author: Guest_Jim_*

Traditionally a camera's zoom works by changing the distance between lenses. While this does work, it is not particularly ideal, given the size of the necessary mechanics. Adaptive zoom however uses a different approach that requires a less-bulky system, and now researchers at Sandia National Laboratories have successfully brought this technology to riflescopes.

For our eyes to focus on an object, muscles must flex a lens, causing its focal length to change. Adaptive zoom works in the same way, though the lenses are now polymers and the muscles are, in this case, piezoelectric materials. More accurately the muscles are an ultrasonic piezo motor that move a rotor and lead screw, which flex the lenses. The use of an ultrasonic motor is important as it allows the focus and zoom to be maintained, even when power is lost. When tested, this new system showed it could complete 10,000 actuations on just the power of two AA batteries.

Adaptive zoom is not a new technology, but this is the first time it has been built into a riflescope for the military with the Rapid Adaptive Zoom for Assault Rifles (RAZAR), which can change from high to low magnifications at the push of a button. The change in magnification happens quickly and does not require the user to move their hands or eyes, which could save their life in a firefight. This technology could also see use in other optical devices, such as binoculars and cell phone cameras.



Source: Sandia National Laboratories

Real Laser Bullets Filmed

Category: Science & Technology
Posted: October 23, 2014 10:24AM
Author: Guest_Jim_*

What would science fiction be without guns going pew pew with laser bullets? The question can also be, what would reality be with those bolts of energy, and researchers at the Institute of Physical Chemistry of the Polish Academy of Sciences decided to find out. The researchers filmed the laser pulses traveling down a hallway, watching for how they illuminate the area.

Of course a normal camera cannot actually film a light pulse, as light travels too quickly. To overcome this issue, the camera was connected to the laser and recorded consecutive frames for different pulses, combining them into a single film. As the physics involved does not change with each pulse, the film provides all of the information as though the camera recorded just one pulse. Those pulses, by the way, were femtosecond long and 10 terawatts in power. That high power is especially important as it allowed the pulse to create a plasma fiber in the air, as it traveled. This caused the laser to self-focus, allowing it to travel much farther without degrading.

The laser itself had a frequency in the near infrared, but as it traveled through the air, it produced a white light, which is important for potential uses of the laser. White light contains many frequencies, and if this laser were used in a LIDAR system, those frequencies could be used to measure certain elements and compounds in the atmosphere.



Source: EurekAlert!

3D Bi-Stable Display Created

Category: Science & Technology
Posted: October 23, 2014 06:29AM
Author: Guest_Jim_*

A device's LCD display can easily be one of its greatest power drains, thanks to the backlight needed to actually show the image. This is not the only power draw though, as the pixels themselves require energy to maintain an image. Bi-stable displays however, can eliminate this requirement, and now researchers at the Hong Kong University of Science and Technology have created a bi-stable display that can also show 3D images, as reported in The Optical Society's Optics Letters journal.

Liquid crystal displays operate by twisting the liquid crystals within each pixel, causing different amounts of polarized light to escape. Normally the twisting is controlled by an electric field, but in bi-stable displays the crystals are set in place using a flash of light. This removes the constant power draw and the electrodes to deliver the energy, allowing the displays to be thinner and more efficient. The Hong Kong researchers went a step further with their design though, by building three zones into the display with different polarizations. With the proper glasses and filters, the displayed image will be 3D to the viewer.

Before you prepare to throw out your current monitor or television, the display is far from commercially viable. Currently it is only greyscale and has a refresh rate too low to show video. The technology could still see use with ereaders and possibly in credit cards, as an added security measure.

Source: The Optical Society

Enabling High-Energy Batteries with a Ceramic Material

Category: Science & Technology
Posted: October 22, 2014 02:17PM
Author: Guest_Jim_*

Batteries are a big deal and we keep creating more technologies that rely on them. Naturally we also want the batteries to last longer than they currently do. One way to potentially achieve this is with lithium anode batteries, and researchers at Oak Ridge National Laboratory have made a discovery that could help bring those batteries out of the lab.

In theory a lithium anode battery would offer the highest known theoretical capacity, when used with an aqueous electrolyte. The problem here is that lithium and water react violently together, so something must keep them separated in the battery. What the ORNL researchers have done is identified a new separator called LLZO, which is a cubic garnet material. Unlike some other separators, LLZO is able to withstand very extreme alkaline environments, even staying stable at a pH value over 14.

This great stability can indirectly increase some battery's energy density, as some have turned to diluting the aqueous solution to keep other separators from failing. By removing the need to dilute, the battery can be smaller, bumping its energy density up.

Source: Oak Ridge National Laboratory

Record Transmission Rate for High Frequency Circuitry

Category: Science & Technology
Posted: October 22, 2014 11:29AM
Author: Guest_Jim_*

Everybody wants to get their data faster, whether it is a game or video, the sooner it can be on their screen, the better. Of course achieving higher speeds is not easy and special technologies may be required. Researchers at Chalmers University of Technology have recently set a new record for transmission rate of 40 Gbps when using signals at the high frequency of 140 GHz.

To accommodate the increased bandwidth users' demand, researchers are trying to use signals of higher frequencies. The higher the frequency, the more data a signal can carry, but it is harder to send a 100 GHz or higher signal with enough power to be detected. The Chalmers researchers were able to achieve this in their laboratory though, by wielding semiconducting circuits made of indium phosphide, and will soon be discussing their work at a conference.

The uses for such high speed, wireless data transmission are obviously numerous and include such things as transmitting live cultural and sporting events to screens in high resolution, and making connections between server rooms and even within our homes, without the need for more cables. The researchers believe that in a few years they may even be able to achieve their goal of 100 Gbps wireless transmission.

Source: Chalmers University of Technology

Extending High-Speed Science Network Across the Atlantic

Category: Science & Technology
Posted: October 22, 2014 06:47AM
Author: Guest_Jim_*

Some say we are in the era of big data, where massive collections of information are gathered and shared across the planet. Some of the most massive collections come from and go to research facilities, which is why unbelievably fast networks are built between them. Soon new connections will be built between the United States and Europe, delivering a capacity 340 Gbps, and the project will be managed by Berkeley Lab.

Perhaps the prime example of why this extension is needed is the Large Hadron Collider, as it can produce 30 petabytes of data a year and that value may go up over time (one petabyte is a thousand times larger than a terabyte). To be of any use, that data must be shared with other facilities for processing and study, which this new link will help with. Here in the US it will connect with the Energy Sciences Network, for distribution to US laboratories and universities, while in Europe it will connect to the GÉANT network organization with 100 Gbps links.

The goal is to have the network extension in production by January, to take advantage of the LHC current downtime for upgrades.

Source: Berkeley Lab

Controlling Crystal Structures with Additive Manufacturing Process

Category: Science & Technology
Posted: October 21, 2014 02:16PM
Author: Guest_Jim_*

Many believe that there will be a new renaissance of sorts in the near future, thanks to 3D printing. Additive manufacturing in general opens up some interesting doors at it allows for the precise construction of objects, with potentially little waste. Now researchers at Oak Ridge National Laboratory have found a way to control the crystal structure of a material using an additive manufacturing system.

To achieve this control, the researchers had to precisely manage the electron beam from an ARCAM electron beam melting system. This system works by fusing layers of metal powder together using an electron beam. In this case, it was a nickel-based part they were creating.

Many properties of a material are influenced by its microstructure, so this work could have some very powerful implications. Microelectronics to jet engine components could all have their characteristics tailored to achieve the performance desired.

Source: Oak Ridge National Laboratory

Novel Laser Tractor Beam Designed

Category: Science & Technology
Posted: October 21, 2014 09:44AM
Author: Guest_Jim_*

Though perhaps not as lauded as some science fiction technologies, tractor beams are still somewhat common in the genre. They are also among the sci-fi technologies that can or do exist, in one form or another. Researchers at the Australian National University have recently developed a laser tractor beam that operates on a different principle than most, allowing it to actually reverse its effects.

Normally a laser-based tractor beam uses the momentum of photons to move the particles they target. This design however uses the laser beam to selectively heat the target particle. That heat then causes air molecules to warm and move away from the surface, forcing the particle to recoil. By moving the hotspot on the particle, the researchers are able to change how the particle moves, potentially having to reverse direction.

As this design uses only a single laser, it is somewhat versatile and could find some interesting applications. These include capturing particles, including pollution, from the air or retrieving other particles for sampling purposes.

Source: Australian National University

Internet Usage Mapped Over the Course of a Day

Category: Science & Technology
Posted: October 21, 2014 05:43AM
Author: Guest_Jim_*

For many of us, the Internet is likely always available, except during an outage. To better understand the Internet and recognize outages, researchers at the University of Southern California tracked Internet usage across the planet for two months. From this data, they created a map that shows the Internet sleeping, as it were.

To collect the data, the research pinged 3.7 million IP address blocks, which would be around 950 million individual addresses, every 11 minutes for two months. This allowed them to establish a baseline for Internet usage and then track its use through the day. In the most developed areas, such as the United States and Europe, usage appeared constant as the routers we use to connect are always on. In less developed and wealthy nations however, usage will fluctuate.

The plan for this research is to help scientists and policymakers understand the normal operation of the Internet. With this information, normal downtimes may not be misidentified as outages and be able to predict how networking policies can influence network usage.



Source: University of Southern California

New Superconducting Circuit Designed

Category: Science & Technology
Posted: October 20, 2014 02:12PM
Author: Guest_Jim_*

Superconductivity is an interesting phenomenon that could have many applications from power lines to computer circuits. Exactly how a superconducting circuit would take shape though is still being determined. Researchers at MIT have recently developed and tested one circuit design that could make superconducting circuits cheaper and easier to produce.

Josephon junctions are a kind of superconducting circuit that have been able to reach 770 GHz, but while they do have great potential, they are hard to make and hard to work with. The new design from MIT is called a nanocryotron, or nTron, and would be much simpler to create as it consists of nanowires forming a T shape. Where the base meets the crossbar though, the base tapers down to a point. When an electrical current is applied to the base, the point causes electrons to bounce off of each other, producing enough heat to warm the crossbar past its critical temperature. This ends the conductivity of the crossbar, until it is cooled again, and thus acts as an electrical switch. This design does have limitations though, such as likely never surpassing 1 GHz, but being simpler to create, working with currents similar to those in other hardware, and an impedance that matches that of mRAM may still make it very useful.

As superconductors can carry a current without resistance, they can work with a percent the energy needed by modern electronics. Of course the liquid-helium cooling system would cut into some of that savings, but it could still be a net improvement.

Source: MIT

Replacement for Rare Earth Elements in LEDs Developed

Category: Science & Technology
Posted: October 20, 2014 09:16AM
Author: Guest_Jim_*

Light emitting diodes for home lighting have been growing in popularity of late, thanks to their efficiency and long lives. One problem they possess though is cost, and that problem may get worse in the future. Rare earth elements are needed for LEDs and many other technologies, and as the supply shrinks, costs will increase, unless someone does something about it.

As reported in the Journal of the American Chemical Society, researchers have developed an alternative to the rare earth elements in LEDs that is instead based on copper iodide. This material is much more abundant and can still be tuned to produce a variety of colors, including white. The white light the researchers were able to make was also warmer than that typical white LEDs emit.

Source: American Chemical Society

Interactive Typewriter Created

Category: Science & Technology
Posted: October 20, 2014 05:56AM
Author: Guest_Jim_*

It can be weird to think of the number of technologies that future generations may never encounter, and one of these will likely be the typewriter. With computers and word processors, it would seem like typewriters no longer serve a purpose. With some imagination and creativity though, a student at the University of Plymouth has resurrected a typewriter and connected it to the Internet.

It was not an easy task, as some parts had to be built and supplied by a German company, but it was a fun project, according to the 22-year-old student. The typewriter, called Dico, can tell when someone is approaching it using ultrasound, and will then connect to a random person on an Internet chat service. Using micro-controllers and solenoids, messages can be received and typed onto the paper to be read, though sometimes it will be encrypted. This was intentional, to cause the user to think about online security.

The student would like to refine Dico some more and may even build another, so the pair can talk to each other. This is not the only time he has converted older technology into something new and interesting, as he gave the 1950s short wave radio the ability to create small poems from people's brain activity.

Source: University of Plymouth

New Magnetic Mirror Created

Category: Science & Technology
Posted: October 17, 2014 12:31PM
Author: Guest_Jim_*

Mirrors are fairly common and useful objects, but do you know how they work? When light, electromagnetic radiation strikes a mirror, it interacts with the electrical component, causing the reflection to have the reverse electric field. Though not possible naturally, metamaterials can allow for magnetic mirrors that reflect the magnetic component, and, as reported in The Optical Society's Optica journal, a new design has been developed.

The reason metamaterials are required for a magnetic mirror has to do with the fact that magnetic fields interact with charged particles, but light has no charge. The first metamaterials to achieve magnetic mirroring only worked on long microwave frequencies. More recent designs using 'fish-scale' shaped metallic components allow for shorter wavelengths, but have considerable signal loss and are very dependent on the components' particular shapes. The new design addresses these issues by using a 2D array of non-metallic dielectric resonators. These resonators interact strongly with the magnetic component of light and, being made out of tellurium, have a low signal loss compared to their metallic counterparts.

Among the reasons magnetic mirrors would be useful is that traditional mirrors reversing the electric components of light, causes that component to cancel out, at the surface. This prevents nanoscale antennas and quantum dots from interacting with the light. By preserving the electric component, a magnetic mirror would allow for the maximum absorption of the light, and new technologies.

Source: The Optical Society

World's Thinnest Electric Generator Created

Category: Science & Technology
Posted: October 17, 2014 05:42AM
Author: Guest_Jim_*

More many modern technologies, thin is in, but this example may be a bit extreme. Researchers at Columbia University and the Georgia Institute of Technology have discovered a 2D material that exhibits the piezoelectric effect. This effect links mechanical deformation to the creation of electrical voltages.

Molybdenum disulfide (MoS2) is part of a family of materials known as transition metal dichalcogenides, which are 2D semiconductors. In theory, they can all be piezoelectric because they all break central symmetry, but this is the first time one has been successfully tested. While MoS2 did demonstrate the effect though, it does not always. As a bulk material, it does not, but even when working with atomically-thin sheets, it does not always. There must be an odd number of layers to generate any electricity, because with an even number the layers' output voltages will actually cancel each other out. Also electricity was only generated when the material was deformed in a specific direction.

Even with all of these conditions, this is still an important discovery, as it suggests other piezoelectric materials that can be just atoms thick. Being so thin, the materials will be naturally flexible, making it possible to use these generators to power wearable devices.

Source: Columbia University

New Speed Record for LEDs

Category: Science & Technology
Posted: October 16, 2014 05:26AM
Author: Guest_Jim_*

We may not think about it when we turn a light on, but every light source only produces so many photons in a second. Depending on the application, this emission speed can be critical, such as in telecommunications where 10 billion photons need to be produced in the blink of an eye. Typical LEDs only produce 10 million photons in that much time, but researchers at Duke University have found a way to close the gap.

The Purcell effect describes how emissions from fluorescent molecules can be increased when the molecules are near an intense light source. To create that light source, the researchers sandwiched the molecules between a 75 n silver nanocube and a thin film of gold. When the cube size and gap are tuned properly, the researchers realized a 1000 fold increase in fluorescence speed for the LED.

That record-setting speed may be surpassed before long though, as the researchers believe that aligning the molecules could magnify the effect. Regardless, fast light sources like this could prove invaluable for telecommunications and even quantum cryptography.

Source: Duke University

Two New Types of Qubits Created

Category: Science & Technology
Posted: October 15, 2014 03:41PM
Author: Guest_Jim_*

Teams around the world are working on technologies to enable quantum computers, and some teams are right next to each other. Two teams at the University of New South Wales have independently developed two quantum bit, or qubit systems, and have even set some records with them.

The fundamental units in quantum computers are qubits, which are particles put into a superposition. Superposition is a phenomenon that allows something to exist in multiple, exclusionary states at the same time, and from this quantum computers would be able to run algorithms far different than conventional computers. Superposition is fragile though, so qubits must be designed for great accuracy, and to achieve that here, both teams used pieces of pure silicon-28, which is nonmagnetic, unlike the mix of isotopes in modern electronics. One team put a phosphorus atom in their silicon, actually creating two qubits (the nucleus and the electron) while the other created an artificial atom that is very similar to MOSFETs, a kind of silicon transistor.

The ability to build a qubit in and from silicon is of great importance as it could allow current manufacturing methods and tools to construct quantum computers in the future. The phosphorus-atom qubit design also managed to survive for 35 seconds, which is impressive for any solid-state qubit, but is actually the record for silicon qubits.



Source: University of New South Wales

Researchers See Dopant Atoms Move

Category: Science & Technology
Posted: October 15, 2014 11:13AM
Author: Guest_Jim_*

If not for dopants, much of today's technology may not exist. Doping is the process of adding atoms to a material, to change its properties, and is critical for controlling the characteristics of semiconductors. After being placed in a material though, the doping atoms can move around, and ORNL researchers have finally caught them in the act.

Previous studies examining the diffusion of doping atoms had to use indirect macroscopic methods, and were limited to the surfaces of materials. By using a scanning transmission electron microscope though, the researchers were able to watch the as manganese and cerium atoms moved through the bulk of a piece of aluminum nitride. Just as theory predicted, though counter to normal expectations, the larger cerium atoms were observed to move while the smaller manganese atoms remained stationary.

By understanding how dopant atoms behave, this research could lead to better semiconductor devices, including LED lights. The color emitted by these lights is determined by the dopants, and their movement could affect when the LED fails.

Source: Oak Ridge National Laboratory

Understanding How Nanoparticles Can Enter the Skin

Category: Science & Technology
Posted: October 15, 2014 06:23AM
Author: Guest_Jim_*

Nanoparticles are a technology that could one day become completely ubiquitous with uses in everything from medicine to cosmetics. Before that can happen though, we must first learn how they behave, including how they can penetrate human skin. Researchers at the University of Southampton have recently conducted the research to determine just how that behavior works.

Other studies have examined why some nanoparticles will enter the skin and others will not, but never quite had the level of control necessary to make definitive statements. This new research does though, as it controlled the surface charge, shape, and functionality of gold nanoparticles for its tests. The results indicate that nanorods with a positive charge are two to six times better at penetrating the skin than other nanoparticles. Coating them with penetrating peptides increased the penetration by up to a factor of ten, allowing the particles to reach into the dermis.

This work could be used to develop nanoparticles for topical drug delivery, but it could also be used to prevent nanoparticles from entering the skin. If a cosmetic were to contain potentially toxic nanoparticles, they could be prevented from entering the skin just by designing them to be unable to.

Source: University of Southampton

Smart Batteries Could Give Warnings Before Short-Circuits

Category: Science & Technology
Posted: October 14, 2014 06:13AM
Author: Guest_Jim_*

The prospect of a battery exploding is not something anyone likes to think about, but the possibility does exist. With lithium-ion batteries seeing more and more use in consumer electronics, airplanes, and electric vehicles, the danger is only growing. Researchers at Stanford University decided to do something about this and have created a smart battery that can alert a user, before a fatal short circuit.

At one end of a lithium-ion battery is a carbon anode, and at the other a lithium metal-oxide cathode. Between them is a polymer separator that keeps the electrodes apart, while allowing lithium ions to flow through it. If a dendrite were to form from the anode though, it could pierce the separator and reach the cathode, causing a short. What the Stanford researchers have done to avoid this is add a layer of copper right next to the separator. The copper will act like a third electrode, measuring the voltage between the anode and the separator. If a dendrite does grow from the anode and touch the copper, the voltage difference will drop to zero, and thus provide a warning of impending failure.

By changing the distance from the anode, it would be possible to tune how much lead-time a warning comes with. By placing it closer to the anode, shorter dendrites will be detected, long before they can reach the cathode, cause a short, and potentially a fire.

Source: Stanford University

Dynamic Encryption Scheme Created

Category: Science & Technology
Posted: October 13, 2014 08:02AM
Author: Guest_Jim_*

Data security has always been important, but has never been quite as valued as it is now. To that end, new security systems are being developed, such as the dynamic encryption system created by a professor at the Technical University of Denmark.

Many telecommunication operators use the Advanced Encryption Standard (AES) to protect things like phone calls, and while it works, it is possible to decrypt it with enough computing power. This dynamic encryption system adds more layers to the encryption, making it more complex and difficult to crack, but what makes it especially effective is that it randomly chooses the layers to add. Every time someone makes a phone call using this system, AES and some additional layers are used to protect it, but with the next call, different layers are used. Even if someone were able to eavesdrop, they would find it harder to decrypt because they would not know the exact methods used to encrypt the transmission.

The dynamic encryption system is currently being marketed as a way to counter industrial espionage by the Dencrypt company the Denmark professor started.

Source: Technical University of Denmark

New Probe for Measuring Electric Fields Created

Category: Science & Technology
Posted: October 10, 2014 11:42AM
Author: Guest_Jim_*

Many devices and technologies rely on electric fields in one way or another, which makes it important to know the fields involved. To that end, researchers at NIST and the University of Michigan have developed a new electric field probe that uses some powerful quantum properties.

At the heart of the probe is a cylinder containing atoms that have been put into high-energy, Rydberg states using red and blue lasers. In these states, the rubidium or cesium atoms are extremely sensitive and reactive to electromagnetic fields, with electric fields altering the frequencies of light they absorb. This use of quantum mechanics actually makes the system self-calibrating, improving its precision. This allows it to measure field strengths as low as 0.8 millivolts per meter, which is 100 times weaker than conventional methods can measure. The range of frequencies it can measure reaches from 1 to 500 GHz, covering radio, microwave, millimeter-wave, and sub terahertz bands, but it may be possible to reach up to 1 THz.

For the time being the probe is tabletop sized, but by using photonic structures, it should be possible to shrink it down, possibly allowing it to be part of a NIST on a chip. Potential uses include testing and calibrating antennas, sensors, biomedical, and nanoelectronic systems, as well as enable the development of future devices.

Source: NIST

New Particle May help Explain a Fundamental Force

Category: Science & Technology
Posted: October 10, 2014 07:14AM
Author: Guest_Jim_*

One of the curious facts physics has given us is that there are only four fundamental forces in the Universe. The gravitational force, electromagnetic force, weak nuclear force, and strong nuclear force are all that exist, with everything we may experience being the results of these. Both gravity and the electromagnetic force are pretty well understood, while the nuclear forces are trickier to grasp. A new discovery by researchers at the University of Warwick however, may change that with regards to the strong force.

While gravity dominates on the large scale and electromagnetism covers how molecules interact with each other, as well as how electrons bind to nuclei, the strong nuclear force explains how quarks in protons and neutron stay together. It is so strong that it contributes more to the mass of a proton than the quarks that comprise it. The math behind the force are very complicated though and not well understood, in part because it is difficult to test predictions with experiments. That may change though thanks to the discovery of Ds3*(2860)-, which contains a charm quark and has a spin of 3. Charm quarks are heavier than the up and down quarks in protons and neutrons, making them easier to run calculations for. Having spin 3 is useful as a way to easily identify the particle.

The hope is that it will be possible to use Ds3*(2860)- as a benchmark for testing theories concerning the strong nuclear force. The particle was discovered from data from the LHC, and now there is hope that other new particles will be discovered that could help explain the weak nuclear force. Eventually such work may even provide answers for why there is more matter than antimatter.

Source: University of Warwick

New Fusion Reactor Design that could be Cheaper than Conventional Power Plants

Category: Science & Technology
Posted: October 9, 2014 12:39PM
Author: Guest_Jim_*

Sustainable nuclear fusion has been a target for researchers for decades, as it could potentially provide immense power from seawater and have produce little waste. Now there are many different groups working on different reactor designs and technologies across the planet, all with the goals stability and efficiency. Researchers at the University of Washington have designed a new reactor concept that could achieve both goals.

Critical to all fusion reactor designs is a mechanism that uses magnetic fields to control the superheated plasma fuel. While some designs call for superconductors to produce these fields, this design instead passes an electrical current through the plasma. The result is a dramatic reduction in size, required materials, and thereby cost. The researchers predict that a fusion power plant using this kind of reactor could provide a gigawatt of power and cost $2.7 billion. A similarly powerful coal plant costs approximately $2.8 billion, so the fusion plant would be in direct economic competition.

So far the prototype has demonstrated its ability to sustain the plasma efficiently. The final design, which will be ten times larger and more powerful, is still years into the future.

Source: University of Washington

Advanced Laser System for Remotely Mapping 3D Surfaces

Category: Science & Technology
Posted: October 9, 2014 05:52AM
Author: Guest_Jim_*

Lasers are a technology many television shows, movies, books, and games like to use in possible and impossible ways. Among the possible ways is using a laser system to scan a room or object, to create a 3D map of it, potentially for forensic use. Now researchers at NIST have developed a new mapping system that offers great accuracy, range, and speed

Laser detection and ranging (LADAR) is not a new technology as it bounces lasers off of objects, and analyzes the reflected light to determine distance. What is novel about the NIST system is its use of a frequency comb, which is able to precisely measure different frequencies of light. Here it is used to constantly calibrate the laser as it sweeps through a range of frequencies, increasing the system's accuracy and speed. It is actually able to resolve distances to within 10 micrometers, in half a millisecond, from as far away as 10.5 meters. In just 8.5 minutes, a 3D image of one million pixels can be generated.

The system is roughly the size of a desktop, but it should be possible to shrink it down to a chip-scale device. No doubt that will be useful for mapping crime scenes, but it could also find use with precision machining and assembly.

Source: NIST

Important Advance in Acoustic Imaging Made

Category: Science & Technology
Posted: October 8, 2014 03:05PM
Author: Guest_Jim_*

Chances are, most people are familiar with medical ultrasounds that use sound waves to peer into a patient, without doing any harm to the body. Ultrasounds are also used to image metal structures, in an effort to find cracks that could cause critical failures. The technology has been limited to just large problems for some time though, but researchers at the University of Bristol have finally developed a nonlinear technique that is much more sensitive.

Acoustic nonlinearity is an old idea, but no imaging method has been developed before now. It works by looking at the differences between acoustic fields generated from parallel elements in an ultrasonic array, as they are fired sequentially. The results are sound waves that are more sensitive to changes in the material, including microstructure changes, before they develop into macroscopic problems.

By catching cracks before they begin, it will be easier to predict the life of a structure, which could lead to thinner and lighter structures, including future aircraft. As the technique works with modern inspection equipment, it could be quickly adopted and put to use for its many applications.

Source: University of Bristol

Social Media Used to Manage Moods

Category: Science & Technology
Posted: October 8, 2014 07:01AM
Author: Guest_Jim_*

Some days, things just do not seem to go right and put you in a bad mood. When this happens, what do you do? According to researchers at the Ohio State University, many of us will look at social media profiles of those in worse situations than us.

The social networks many people use online are very special in that people are able to manage their use of them, whereas offline you do not always have a choice of who you encounter. Normally people look for positive news, but the researchers decided to investigate if this changes when the user is in a bad mood. To put their subjects in a bad mood, the researchers gave 168 college students a test on facial emotion recognition and randomly reported their performance as terrible or excellent. Now primed with a positive or negative mood, the participants were asked to review a new social networking site. On the site were eight profiles that had very similar, mundane postings, with the only real differences being with the profile rankings of career success and attractiveness. Those rankings were either very low or very high.

Everybody still focused on the profile of the more successful and attractive people, but those participants in a bad mood spent significantly more time looking at the other profiles. The researchers believe this shows that when we are in a bad mood, we will try to manage it by seeking out people in worse situations for a self-esteem boost, as we compare ourselves to them.

Source: Ohio State University

Using Online Games to Combat Scientific Fraud and Cherry-Picked Data

Category: Science & Technology
Posted: October 7, 2014 04:08PM
Author: Guest_Jim_*

Something many people are likely not aware of is the amount of fraud and cherry-picking in the sciences, including life sciences. This comes in part from a great pressure to publish, being overwhelmed by data, and from the people creating the hypothesis also being the ones to test it. To combat these issues, researchers at Carnegie Mellon University and Stanford University suggest using massive online labs that use video games to essentially crowd source the work.

Online labs have been used before as some of the researchers involved with this work recently reported the success of their own lab, EteRNA. Some 150,000 participants all registered to help develop and test hypotheses, and process the results of the experiments. With so many people involved, many sets of eyes are on every detail, so any mistake will likely be caught, and biases will be removed as those testing a hypothesis are not necessarily those who developed it. This also makes otherwise overwhelming amounts of data manageable as many thousands of people will look at the data, instead of the handful in a lab. It also keeps the entire process open and transparent.

The researchers making this suggestion do note two challenges that have to be overcome for this approach to work. One is the cost to create a massive online lab, which is still within the budge of the usual life science grant, but more importantly the view that video games do not align with serious or rigorous research.

Source: Carnegie Mellon University

New Web Privacy System Developed

Category: Science & Technology
Posted: October 7, 2014 12:12PM
Author: Guest_Jim_*

Privacy is a great concern for a great many people, and it is can also be tricky to achieve with how much technology today relies on sharing data. Such sharing opens up the possibility of data being illegitimately accessed without the consent or even the knowledge of the user. Researchers at the University College London, Stanford Engineering, Google, Chalmers, and Mozilla Research however, have recently created a new privacy system that might just be able to keep our data private, without breaking web applications.

The new system is call Confinement with Origin Web Labels (COWL) and works by confining data to only the party it was originally shared with. So, with COWL if a web app requests information from a website, it will receive that information, but will be prevented from sending it anywhere else. This way the site sharing the data maintains control, even after its transmission. This is in contrast to Same Origin Policy, which prevents programs from reading data from other websites and thus prevents mashup applications, or Cross-Origin Resource Sharing, which can easily be made to expose information.

Prototypes of COWL have already been tested for Chrome and Firefox and showed no perceptible impact on page-loading. For those interested in using COWL, it will be made freely available on the 15th of this month at http://cowl.ws/.

Source: University College London

US Navy Successfully Demonstrates Swarming of Unmanned Surface Vehicles

Category: Science & Technology
Posted: October 7, 2014 06:31AM
Author: Guest_Jim_*

In recent years we have seen an explosion of unmanned vehicles and vehicles capable of directing themselves, such as small drones and self-driving cars. Such vehicles are not limited to the land and air though, as the Office of Naval Research has been developing Unmanned Surface Vehicles (USVs) that could be used to protect manned ships. Now ONR researchers have successfully completed tests on a system giving these USVs swarm capability.

Swarming has long been a focus of robotics and artificial intelligence research, as it allows groups of individual actors to act as one, more powerful force. By bringing it to USVs, the vehicles are able to quickly respond to threats and work together, such as plotting out routes to interdict other vessels. The technology for automating the boats, called CARACaS (Control Architecture for Robotic Agent Command and Sensing), can fit into transportable kits and can be installed into most boats. It was also recently demonstrated in the James River in Virginia by as many as 13 boats acting to escort a Navy ship, and swarm a threatening ship.

The future of these boats and system is to deploy them to protect larger, manned ships, and to send them into dangerous situations, instead of Sailors or Marines. The boats would have offensive capabilities for deterring or destroying adversaries, but weapons fire could only be initiated by a supervising Sailor.



Source: Office of Naval Research

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