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A new form of electronics manufacturing which embeds silicon nanowires into flexible surfaces could lead to radical new forms of bendable electronics, scientists say.

In a new paper published today in the journal Microsystems and Nanoengineering, engineers from the University of Glasgow describe how they have for the first time been able to affordably ‘print’ high-mobility semiconductor nanowires onto flexible surfaces to develop high-performance ultra-thin electronic layers.

Those surfaces, which can be bent, flexed and twisted, could lay the foundations for a wide range of applications including video screens, improved health monitoring devices, implantable devices and synthetic skin for prosthetics.

Continue reading “Printed electronics breakthrough could lead to flexible electronics revolution” »

Lasers are widely used as high power sources of light operating at a specific frequency. But how does this frequency get selected when a laser is turned on, and how quickly?

Pioneering engineers working with terahertz frequency technology have been researching how individual frequencies are selected when a laser is turned on, and how quickly the selection is made.

The development of specific terahertz equipment has allowed them to investigate this process for the first time. Their results, published in Nature Communications, will underpin the future development of semiconductor lasers, including those used in public and private sector-owned telecommunications systems.

Continue reading “Terahertz technology creates new insight into how semiconductor lasers work” »

A team of scientists has uncovered new molecular properties of water—a discovery of a phenomenon that had previously gone unnoticed.

Liquid water is known to be an excellent transporter of its own autoionization products; that is, the charged species obtained when a water molecule (H₂O) is split into protons (H^{+) and hydroxide ions (OH−). This remarkable property of water makes it a critical component in emerging electrochemical energy production and storage technologies such as fuel cells; indeed, life itself would not be possible if water did not possess this characteristic.}

Water is known to consist an intricate network of weak, directional interactions known as hydrogen bonds. For nearly a century, it was thought that the mechanisms by which water transports the H⁺ and OH⁻ ions were mirror images of each other – identical in all ways except for directions of the hydrogen bonds involved in the process.

Continue reading “The behavior of water—scientists find new properties of H2O” »

When skeletal defects are unable to heal on their own, bone tissue engineering (BTE), a developing field in orthopedics can combine materials science, tissue engineering and regenerative medicine to facilitate bone repair. Materials scientists aim to engineer an ideal biomaterial that can mimic natural bone with cost-effective manufacturing techniques to provide a framework that offers support and biodegrades as new bone forms. Since applications in BTE to restore large bone defects are yet to cross over from the laboratory bench to clinical practice, the field is active with burgeoning research efforts and pioneering technology.

Cost-effective three-dimensional (3D) printing (additive manufacturing) combines economical techniques to create scaffolds with bioinks. Bioengineers at the Pennsylvania State University recently developed a composite ink made of three materials to 3D print porous, bone-like constructs. The core materials, polycaprolactone (PCL) and poly (D, L-lactic-co-glycolide) acid (PLGA), are two of the most commonly used synthetic, biocompatible biomaterials in BTE. Now published in the Journal of Materials Research, the materials showed biologically favorable interactions in the laboratory, followed by positive outcomes of bone regeneration in an animal model in vivo.

Since bone is a complex structure, Moncal et al. developed a bioink made of biocompatible PCL, PLGA and hydroxyapatite (HAps) particles, combining the properties of bone-like mechanical strength, biodegradation and guided reparative growth (osteoconduction) for assisted natural bone repair. They then engineered a new custom-designed mechanical extrusion system, which was mounted on the Multi-Arm Bioprinter (MABP), previously developed by the same group, to manufacture the 3D constructs.

An early prototype of the silicon-chip-sized particle accelerator that scientists at Stanford University are developing. Later, this could be made smaller to be inserted into the body and used to treat tumour.

Kinema Systems and GhostRobotics faced off and shared their pitches with the live audience at NVIDIA’S GPU Technology Conference (GTC) to showcase different approaches with autonomous systems using deep learning, machine learning and AI.

Kinema Systems, based in Menlo Park, Calif., is building innovative deep learning and 3D vision-based robotic solutions for logistics and manufacturing.

From Philadelphia, Pa., GhostRobotics is revolutionizing legged robotics and the market for autonomous unmanned ground vehicles used in unstructured terrain and harsh environments.

Continue reading “Robotics Solutions Using Deep Learning” »

While Facebook and Google recently pulled the plug on their solar-powered internet drones, another company with a lot more experience is having success with the idea. Airbus announced that its solar-powered Zephyr S HAPS (high altitude pseudo-satellite) flew for 25 straight days, setting a time aloft record for any airplane, ever. It shattered the previous record of 14 days, marked by a previous prototype Zephyr aircraft.

The Zephyr flies on sun power alone at over 70,000 feet, an altitude that just a few aircraft like the Concorde and SR-71 Blackbird have reached. That’s well above any weather, and lets it perform reconnaissance, surveillance and communications/internet duties. “[It fills a] capability gap complimentary to satellites, UAVs and manned aircraft to provide persistent local satellite-like services,” Airbus said in a press release. A video of the takeoff (below) shows that it can be lifted and launched by hand. Once aloft, it can be operated for a fraction the cost of a satellite.

Continue reading “Solar-powered aircraft stays aloft for record-breaking 25 days” »

The FBI is warning banks about a fraud scheme called an ATM cash-out, Krebs on Security reports. With this type of heist, attackers typically compromise a bank or payment card processor with malware, disable fraud controls and withdraw large sums of money — sometimes millions of dollars — with cloned bank cards. The FBI reportedly sent an alert to banks last week. “The FBI has obtained unspecified reporting indicating cyber criminals are planning to conduct a global Automated Teller Machine (ATM) cash-out scheme in the coming days, likely associated with an unknown card issuer breach and commonly referred to as an ‘unlimited operation’,” said the notice.

Once hackers gain access to a financial institution’s system, often through phishing, they’ll alter account balances as well as disable maximum ATM withdrawal amounts and transaction limits. That way, they can quickly take out large amounts of cash from ATMs with fraudulent bank cards made from stolen card data and gift cards.

Last month, Krebs on Security reported on two successful applications of this type of scheme. Hackers were able to steal around $2.4 million from The National Bank of Blacksburg through two ATM cash-outs in 2016 and 2017.

The physical conditions that support a geometric interpretation of spacetime, such as the equivalence between rest and inertial mass, are shown not to be necessarily valid in the quantum regime, and a quantum formulation is provided.