Posts belonging to Category Mathematics



3D Printed Concrete Bridge

Today world’s first 3D printed reinforced, pre-stressed concrete bridge was opened. The cycle bridge is part of a new road around the village of Gemert, in the Netherlands. It was printed at Eindhoven University of Technology. With the knowledge the researchers gained in this project, they are now able to design even larger printed concrete structures.
The bridge is the first civil infrastructure project to be realized with 3D-concrete printing. The bridge is 8 meters long (clear span 6.5 meters) and 3.5 meters wide. As it is a ‘worlds first’, the developers did not take any chances and tested the bridge by putting a load of 5 tons on it, which is a lot more than the load the bridge will actually carry.

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The bridge has to meet all regular requirements of course. It is designed to do its duty – to carry cyclists – for thirty years or more. With more cycles than people in the Netherlands, it is expected that hundreds of cyclists will ride over the printed bridge every day. It is part of a large road construction project, led by the company BAM Infra, and commissioned by the province of North-Brabant.
An important detail is that the researchers at Eindhoven University of Technology have succeeded in developing a process to incorporate steel reinforcement cable while laying a strip of concrete. The steel cable is the equivalent of the reinforcement mesh used in conventional concrete. It handles the tensile stress because concrete cannot deal with tensile stress adequately, but steel can.
One of the main advantages of printing concrete is that much less concrete is needed than in the conventional technique, in which a mold (formwork) is filled with concrete. By contrast, the printer deposits only the concrete where it is needed, which decreases the use of cement. This reduces CO2 emissions, as cement production has a very high carbon footprint.

Another benefit lies in the freedom of form: the printer can make any desired shape, whereas conventional concrete shapes tend to be unwieldy in shape due to use of formwork. Concrete printing also enables a much higher realization speed. No formwork structures have to be built and dismantled, and reinforcement mesh does not have to be put in place separately. Overall, the researchers think the realization will eventually be roughly three times faster than conventional concrete techniques.

Source: https://www.tue.nl/

Within 10 years Planes Could Move Up To 10 Times The Speed Of Sound

An average flight from Miami to Seattle takes about six hours and 40 minutes, but imagine being able to reduce that time to 50 minutes or less. A recent study by NASA and Binghamton University researchers could lead to a drastic decrease in flight times. The study, funded in part by the U.S. Air Force, is one of the first steps toward the creation of planes able to move at hypersonic speeds, five to 10 times the speed of soundBinghamton University Associate Professor of Mechanical Engineering Changhong Ke explained that there are currently quite a few obstacles when it comes to building these super planes. The first of which is finding a material that can hold up to hypersonic travel.

Our study used what are called boron nitride nanotubes (BNNTs). NASA currently owns one of the few facilities in the world able to produce quality BNNTs.” Typically, carbon nanotubes have been used in planes for their strength — they’re stronger than steel — and their ability to conduct heat. However, BNNTs are the wave of the future when it comes to air travel. “While carbon nanotubes can stay stable at temperatures up to 400 degrees Celsius, our study found that BNNTs can withstand up to 900 degrees Celsius,” said Ke. BNNTs are also able to handle high amounts of stress and are extremely lightweight.

Withstanding high temperatures is an important requirement for any material meant to build the world’s next super planes, however, Ke clarified that the material has to be able to maintain both structural and mechanical properties in an oxygen environment. “We weren’t testing this material in a vacuum like what you would experience in space. Materials can withstand much higher temperatures in space. We wanted to see if BNNTs could hold up in the type of environment an average fighter jet or commercial plane would experience.”

While the study has brought new light to the strength and stability of BNNTs, their use on planes may not be a reality for another five to 10 years. “Right now, BNNTs cost about $1,000 per gram. It would be impractical to use a product that expensive,” added Ke. But, that does not mean it will never happen. Carbon nanotubes were about the same price 20 years ago. As more studies indicated the usefulness of carbon nanotubes, the production rates increased and prices went down to the current rate, between $10 and $20 per gram. Ke sees the same fate coming down the line for BNNTs.

Source: https://www.binghamton.edu/

Computer Reads Body Language

Researchers at Carnegie Mellon University‘s Robotics Institute have enabled a computer to understand body poses and movements of multiple people from video in real time — including, for the first time, the pose of each individual’s hands and fingers. This new method was developed with the help of the Panoptic Studio — a two-story dome embedded with 500 video cameras — and the insights gained from experiments in that facility now make it possible to detect the pose of a group of people using a single camera and a laptop computer.

Yaser Sheikh, associate professor of robotics, said these methods for tracking 2-D human form and motion open up new ways for people and machines to interact with each other and for people to use machines to better understand the world around them. The ability to recognize hand poses, for instance, will make it possible for people to interact with computers in new and more natural ways, such as communicating with computers simply by pointing at things.

Detecting the nuances of nonverbal communication between individuals will allow robots to serve in social spaces, allowing robots to perceive what people around them are doing, what moods they are in and whether they can be interrupted. A self-driving car could get an early warning that a pedestrian is about to step into the street by monitoring body language. Enabling machines to understand human behavior also could enable new approaches to behavioral diagnosis and rehabilitation, for conditions such as autism, dyslexia and depression.

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We communicate almost as much with the movement of our bodies as we do with our voice,” Sheikh said. “But computers are more or less blind to it.”

In sports analytics, real-time pose detection will make it possible for computers to track not only the position of each player on the field of play, as is now the case, but to know what players are doing with their arms, legs and heads at each point in time. The methods can be used for live events or applied to existing videos.

To encourage more research and applications, the researchers have released their computer code for both multi-person and hand pose estimation. It is being widely used by research groups, and more than 20 commercial groups, including automotive companies, have expressed interest in licensing the technology, Sheikh said.

Sheikh and his colleagues have presented reports on their multi-person and hand pose detection methods at CVPR 2017, the Computer Vision and Pattern Recognition Conference  in Honolulu.

Source: https://www.cmu.edu/

Very Fast Magnetic Data Storage

For almost seventy years now, magnetic tapes and hard disks have been used for data storage in computers. In spite of many new technologies that have been developed in the meantime, the controlled magnetization of a data storage medium remains the first choice for archiving information because of its longevity and low price. As a means of realizing random access memories (RAMs), however, which are used as the main memory for processing data in computers, magnetic storage technologies were long considered inadequate. That is mainly due to its low writing speed and relatively high energy consumption.

In 1956, IBM introduced the first magnetic hard disc, the RAMAC. ETH researchers have now tested a novel magnetic writing technology that could soon be used in the main memories of modern computers

Pietro Gambardella, Professor at the Department of Materials of the Eidgenössische Technische Hochschule Zürich (ETHZ, Switzerland), and his colleagues, together with colleagues at the Physics Department and at the Paul Scherrer Institute (PSI), have now shown that using a novel technique, magnetic storage can still be achieved very fast and without wasting energy.

In 2011, Gambardella and his colleagues already demonstrated a technique that could do just that: An electric current passing through a specially coated semiconductor film inverted the magnetization in a tiny metal dot. This is made possible by a physical effect called spin-orbit-torque. In this effect, a current flowing in a conductor leads to an accumulation of electrons with opposite magnetic moment (spins) at the edges of the conductor. The electron spins, in turn, create a magnetic field that causes the atoms in a nearby magnetic material to change the orientation of their magnetic moments. In a new study the scientists have now investigated how this process works in detail and how fast it is.

The results were recently published in the scientific journal Nature Nanotechnology.

Source: https://www.ethz.ch/

Chinese Quantum Satellite Sends ‘Unbreakable’ Code

China has sent an “unbreakablecode from a satellite to the Earth, marking the first time space-to-ground quantum key distribution technology has been realized, state media said. China launched the world’s first quantum satellite last August, to help establish “hack proofcommunications, a development the Pentagon has called a “notable advance“. The official Xinhua news agency said the latest experiment was published in the journal Nature, where reviewers called it a “milestone“.

The satellite sent quantum keys to ground stations in China between 645 km (400 miles) and 1,200 km (745 miles) away at a transmission rate up to 20 orders of magnitude more efficient than an optical fiber, Xinhua cited Pan Jianwei, lead scientist on the experiment from the state-run Chinese Academy of Sciences, as saying.

That, for instance, can meet the demand of making an absolute safe phone call or transmitting a large amount of bank data,” Pan said. Any attempt to eavesdrop on the quantum channel would introduce detectable disturbances to the system, Pan said. “Once intercepted or measured, the quantum state of the key will change, and the information being intercepted will self-destruct,” Xinhua said.

The news agency said there were “enormous prospects” for applying this new generation of communications in defense and finance.

Source: http://www.reuters.com/

Artificial Intelligence At The Hospital

Diagnosing cancer is a slow and laborious process. Here researchers at University Hospital Zurich painstakingly make up biopsy slides – up to 50 for each patient – for the pathologist to examine for signs of prostate cancer. A pathologist takes around an hour and a half per patient – a task IBMs Watson supercomputer is now doing in fractions of a second.

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“If the pathologist becomes faster by using such a system I think it will pay off. Because my time is also worth something. If I sit here one and a half hours looking at slides, screening all these slides, instead of just signing out the two or three positive ones, and taking into account that there may be a .1 error rate, percent error rate. this will pay off, because I can do in one and a half hours at the end five patients,” says Dr. Peter Wild, University Hospital Zürich.

The hospital’s archive of biopsy images is being slowly fed into Watson – a process that will take years. But maybe one day pathologists won’t have to view slides through a microscope at all. Diagnosis is not the only area benefiting from AI. The technology is helping this University of Sheffield team design a new drug that could slow down the progress of motor neurone disease. A system built by British start-up BenevolentAI is identifying new areas for further exploration far faster than a person could ever hope to.

Benevolent basically uses their artificial intelligence system to scan the whole medical and biomedical literature. It’s not really easy for us to stay on top of millions of publications that come out every year. So they can interrogate that information, using artificial intelligence and come up with ideas for new drugs that might be used in a completely different disease, but may be applicable on motor neurone disease. So that’s the real benefit in their system, the kind of novel ideas that they come up with,” explains Dr. Richard Mead, Sitran, University of Sheffield. BenevolentAI has raised one hundred million dollars in investment to develop its AI system, and help revolutionise the pharmaceutical industry.

Source: http://www.reuters.com/

Artificial Intelligence Tracks In Real Time Everybody In The Crowd

Artificial Intelligence that can pick you out in a crowd and then track your every move. Japanese firm Hitachi‘s new imaging system locks on to at least 100 different characteristics of an individual … including gender, age, hair style, clothes, and mannerisms. Hitachi says it provides real-time tracking and monitoring of crowded areas.

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Until now, we need a lot of security guards and people to review security camera footage. We developed this AI software in the hopes it would help them do just that,” says Tomokazu Murakami, Hitachi researcher.

The system can help spot a suspicious individual or find a missing child, the makers say. So, an eyewitness could provide a limited description, with the AI software quickly scanning its database for a match.
In Japan, the demand for such technology is increasing because of the Tokyo 2020 Olympics, but for us we’re developing it in a way so that it can be utilized in many different places such as train stations, stadiums, and even shopping malls,” comments Tomokazu Murakami.

High-speed tracking of individuals such as this will undoubtedly have its critics. But as Japan prepares to host the 2020 Olympics, Hitachi insists its system can contribute to public safety and security.

Source: http://uk.reuters.com/

Graphene And Fractals Boost The Solar Power Storage By 3000%

Inspired by an American fern, researchers have developed a groundbreaking prototype that could be the answer to the storage challenge still holding solar back as a total energy solution. The new type of electrode created by RMIT University (Australia) researchers could boost the capacity of existing integrable storage technologies by 3000 per cent. But the graphene-based prototype also opens a new path to the development of flexible thin film all-in-one solar capture and storage, bringing us one step closer to self-powering smart phones, laptops, cars and buildings. The new electrode is designed to work with supercapacitors, which can charge and discharge power much faster than conventional batteries. Supercapacitors have been combined with solar, but their wider use as a storage solution is restricted because of their limited capacity.

RMIT’s Professor Min Gu said the new design drew on nature’s own genius solution to the challenge of filling a space in the most efficient way possible – through intricate self-repeating patterns known as “fractals”.

The leaves of the western swordfern are densely crammed with veins, making them extremely efficient for storing energy and transporting water around the plant,” said Gu, Leader of the Laboratory of Artificial Intelligence Nanophotonics at RMIT.

mimicking fern

Our electrode is based on these fractal shapes – which are self-replicating, like the mini structures within snowflakes – and we’ve used this naturally-efficient design to improve solar energy storage at a nano level. “The immediate application is combining this electrode with supercapacitors, as our experiments have shown our prototype can radically increase their storage capacity30 times more than current capacity limits.   “Capacity-boosted supercapacitors would offer both long-term reliability and quick-burst energy release – for when someone wants to use solar energy on a cloudy day for example – making them ideal alternatives for solar power storage.”  Combined with supercapacitors, the fractal-enabled laser-reduced graphene electrodes can hold the stored charge for longer, with minimal leakage.

Source: https://www.rmit.edu.au/

Your browsing history may be up for sale soon

A US House committee is set to vote on whether to kill privacy rules that would prevent internet service providers (ISPs) from selling users’ web browsing histories and app usage histories to advertisers. Planned protections, proposed by the Federal Communications Commission (FCC) that would have forced ISPs to get people’s consent before hawking their data – are now at risk. Here’s why it matters.

Your web browsing patterns contain a treasure trove of data, including your health concerns, shopping habits and visits to porn sites. ISPs can find out where you bank, your political views and sexual orientation simply based on the websites you visit. The fact that you’re looking at a website at all can also reveal when you’re at home and when you’re not.

spy your dataIf you ask the ISPs, it’s about showing the user more relevant advertising. They argue that web browsing history and app usage should not count as “sensitiveinformation.
Not all ISPs want to abolish the privacy protections. A list of several smaller providers – including Monkeybrains.net, Cruzio Internet and Credo Mobile – have written to representatives to oppose the decision. “One of the cornerstones of our businesses is respecting the privacy of our customers,” they said.
How does this differ from the way Google and Facebook use our data?
It’s much harder to prevent ISPs from tracking your data. You can choose not to use Facebook or Google’s search engine, and there are lots of tools you can use to block their tracking on other parts of the web, for example EFF’s Privacy Badger.

Consumers are generally much more limited for choice of ISP, in some cases only having one option in a given geographical area. This means they can’t choose one of the ISPs pledging to protect user data.

Source: https://www.theguardian.com/

Artificial Intelligence Writes Code By Looting

Artificial intelligence (AI) has taught itself to create its own encryption and produced its own universal ‘language. Now it’s writing its own code using similar techniques to humans. A neural network, called DeepCoder, developed by Microsoft and University of Cambridge computer scientists, has learnt how to write programs without a prior knowledge of code.  DeepCoder solved basic challenges of the kind set by programming competitions. This kind of approach could make it much easier for people to build simple programs without knowing how to write code.

deep coder

All of a sudden people could be so much more productive,” says Armando Solar-Lezama at the Massachusetts Institute of Technology, who was not involved in the work. “They could build systems that it [would be] impossible to build before.”

Ultimately, the approach could allow non-coders to simply describe an idea for a program and let the system build it, says Marc Brockschmidt, one of DeepCoder’s creators at Microsoft Research in Cambridge. UK.DeepCoder uses a technique called program synthesis: creating new programs by piecing together lines of code taken from existing software – just like a programmer might. Given a list of inputs and outputs for each code fragment, DeepCoder learned which pieces of code were needed to achieve the desired result overall.

Source: https://www.newscientist.com/

War: Never Underestimate The Power Of Small

If there is one lesson to glean from Picatinny Arsenal‘s new course in nanomaterials, it’s this: never underestimate the power of smallNanotechnology is the study of manipulating matter on an atomic, molecular, or supermolecular scale. The end result can be found in our everyday products, such as stained glass, sunscreen, cellphones, and pharmaceutical products. Other examples are in U.S. Army items such as vehicle armor, Soldier uniforms, power sources, and weaponry. All living things also can be considered united forms of nanotechnology produced by the forces of nature.
explosive3-dimensional tomography generated imaging of pores within a nanoRDEX-based explosive

People tend to think that nanotechnology is all about these little robots roaming around, fixing the environment or repairing damage to your body, and for many reasons that’s just unrealistic,” said Rajen Patel, a senior engineer within the Energetics and Warheads Manufacturing Technology Division, or EWMTD. The division is part of the U.S. Army Armament Research, Development and Engineering Center or ARDEC. “For me, nanotechnology means getting materials to have these properties that you wouldn’t expect them to have.”

The subject can be separated into multiple types (nanomedicine, nanomachines, nanoelectronics, nanocomposites, nanophotonics and more), which can benefit areas, such as communications, medicine, environment remediation, and manufacturingNanomaterials are defined as materials that have at least one dimension in the 1-100 nm range (there are 25,400,000 nanometers in one inch.) To provide some size perspective: comparing a nanometer to a meter is like comparing a soccer ball to the earth.

Picatinny‘s nanomaterials class focuses on nanomaterials‘ distinguishing qualities, such as their optical, electronic, thermal and mechanical properties–and teaches how manipulating them in a weapon can benefit the warfighter. While you could learn similar information at a college course, Patel argues that Picatinny‘s nanomaterial class is nothing like a university class. This is because Picatinny‘s nanomaterials class focuses on applied, rather than theoretical nanotechnology, using the arsenal as its main source of examples. “We talk about things like what kind of properties you get, how to make materials, places you might expect to see nanotechnology within the Army,” explained Patel. The class is taught at the Armament University.

In 2010, an article in The Picatinny Voice titled “Tiny particles, big impact: Nanotechnology to help warfighters” discussed Picatinny’s ongoing research on nanopowders. It noted that Picatinny‘s Nanotechnology Lab is the largest facility in North America to produce nanopowders and nanomaterials, which are used to create nanoexplosives. It also mentioned how using nanomaterials helped to develop lightweight composites as an alternative to traditional steel.

Not too long ago making milligram quantities of nanoexplosives was challenging. Now, we have technologies that allow us make pounds of nanoexplosives per hour at low cost“. Pilot scale production of nanoexplosives is currently being performed at ARDEC. The broad interest in developing nanoenergetics such as nano-RDX and nano-HMX is their remarkably low initiation sensitivity. There are two basic approaches to studying nanomaterials: bottom-up (building a large object atom by atom) and top-down (deconstructing a larger material). Both approaches have been successfully employed in the development of nanoenergetics at ARDEC. One of the challenges with manufacturing nonmaterials can be coping with shockwaves. A shockwave initiates an explosive as it travels through a weapon‘s main fill or the booster. When a shockwave travels through an energetic charge, it can hit small regions of defects, or voids, which heat up quickly and build pressure until the explosive reaches detonation. By using nanoenergetics, one could adjust the size and quantity of the defects and voids, so that the pressure isn’t as strong and ultimately prevent accidental detonation.

It’s a major production challenge because if you want to process nanomaterials–if you want to coat it with some polymer for explosives–any kind of medium that can dissolve these types of materials can promote ripening and you can end up with a product which no longer has the nanomaterial that you began with,”  However, nanotechnology research continues to grow at Picatinny as the research advances in the U.S. Army.

Source: https://www.dvidshub.net/

SpaceX Hyperloop A Step Closer To Reality

The Hyperloop high-speed transportation system has moved a step closer to reality. Teams competed to design subscale versions of the transport pods that could one day whisk passengers between San Francisco and Los Angeles in under half an hour. The competition was hosted by SpaceX and its founder, Elon Musk. Although Musk is not directly involved in the construction of the Hyperloop, the billionaire entrepreneur originally envisioned the concept, having created an open-source plan that encouraged others to build it. The idea is that passengers would travel through low-pressure steel tubes at up to 800 mph (1,288 kph), propelled by a magnetic accelerator. The fastest pod in the competition reached 58mph (93 kph). That was designed and built by a 35-person team from the Technical University of Munich, Germany.

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What made our team stand out is actually a compressor which we bought out of an old aircraft. It’s there to reduce drag and give us some additional speed.” A team from Delft University of Technology in the Netherlands achieved the highest overall score in the competition for their pod with a levitation, stabilization and braking system based on permanent magnets“, said Josef Fleischmann, member of the WARR team from Technical University of Munich.

Hyperloop, the technology is pretty much there already, we just have to implement it. One of the things this competition is for is to show the world that we can do this and convince them that we should build it somewhere and get the ball rolling,” explains Mars Geuze, technical of Delft Hyperloop.
SpaceX has said it will hold a second competition, open to both new and existing student teams, in Summer 2017, this time focused only on maximum speed.

Source: http://delfthyperloop.nl/#intro
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