Showing 20 articles starting at article 501

< Previous 20 articles        Next 20 articles >

Categories: Engineering: Graphene, Paleontology: General

Return to the site home page

     (via sciencedaily.com) 

Two-million-year-old DNA has been identified -- opening a 'game-changing' new chapter in the history of evolution. Microscopic fragments of environmental DNA were found in Ice Age sediment in northern Greenland. Using cutting-edge technology, researchers discovered the fragments are one million years older than the previous record for DNA sampled from a Siberian mammoth bone. The ancient DNA has been used to map a two-million-year-old ecosystem which weathered extreme climate change.

     (via sciencedaily.com)     Original source 

Devastating megafires are becoming more common, in part, because the planet is warming. But a new study suggests bringing 'good fire' back to the U.S. and other wildfire fire-prone areas, as Native Americans once did, could potentially blunt the role of climate in triggering today's wildfires.

     (via sciencedaily.com) 

Dinosaurs dominated the world right up until a deadly asteroid hit the earth, leading to their mass extinction, some 66 million years ago, a landmark study reveals. Fresh insights into dinosaurs' ecosystems -- the habitats and food types that supported their lives -- suggests that their environments were robust and thriving, right up until that fateful day, at the end of the Cretaceous period.

     (via sciencedaily.com) 

Researchers have applied emerging electronic tattoo (e-tattoo) technology to the tricky task of measuring stress levels by attaching a device to people's palms.

     (via sciencedaily.com) 

A lightweight, ultra-shock-absorbing foam made from carbon nanotubes is so good at absorbing and dissipating the energy of an impact, it could vastly improve helmets and prevent concussions and other traumatic brain injuries.

     (via sciencedaily.com) 

The flash Joule heating process turns asphaltenes, a byproduct of crude oil production, into graphene for use in composite materials.

     (via sciencedaily.com) 

First insights into engineering crystal growth by atomically precise metal nanoclusters have been achieved in a new study.

     (via sciencedaily.com) 

Researchers have published a new theory for making batches of carbon nanotubes with a single, desired chirality. Their method could simplify purification of nanotubes that are all metallic or all semiconductors.

     (via sciencedaily.com) 

A recent study has proposed a strategy to synthesize single-crystalline graphite films orders of magnitude large, up to inch scale.

     (via sciencedaily.com) 

Chemists and engineers have discovered a fundamental friction law that is leading to a deeper understanding of energy dissipation in friction and the design of two-dimensional materials capable of minimizing energy loss.

     (via sciencedaily.com) 

Engineers synthesized aligned forests of nanoscale fibers made of boron nitride, or 'white graphene.' They hope to harness the technique to fabricate bulk-scale arrays of these nanotubes, which can then be combined with other materials to make stronger, more heat-resistant composites, for instance to shield space structures and hypersonic aircraft.

     (via sciencedaily.com) 

Researchers have engineered a quantum box for polaritons in a 2D material, achieving large polariton densities and a partially 'coherent' quantum state. New insights from the novel technique could allow researchers to access striking 'collective' quantum phenomena in this material family, and enable ultra-energy efficient and high-performance future technologies. Laying a 'small' 2D material on top of a 'large' layer allowed the researchers to trap and investigate polaritons, comparing them with freely moving polaritons.

     (via sciencedaily.com) 

Researchers have demonstrated how a nanoscale layer of superconducting niobium nitride (NbNx) can be grown directly onto aluminum nitride (AIN). The arrangement of atoms, nitrogen content, and electrical conductivity were found to depend on growth conditions, particularly temperature, and the spacing of atoms in the two materials was sufficiently compatible to produce flat layers. The structural similarity between NbNx and AIN will facilitate the integration of superconductors into semiconductor optoelectronic devices.

     (via sciencedaily.com) 

The carrier concentration and conductivity in p-type monovalent copper semiconductors can be significantly enhanced by adding alkali metal impurities. Doping with isovalent and larger-sized alkali metal ions effectively increased the free charge carrier concentration, and the mechanism was unraveled by their theoretical calculations. Their carrier doping technology enables high carrier concentration and high mobility p-type thin films to be prepared from the solution process, with photovoltaic device applications.

     (via sciencedaily.com) 

Researchers demonstrated a topological insulator device that opens the way towards observing the quantum anomalous Hall effect. Because the currents generated are resistant to scattering, but very sensitive to applied magnetic fields, they may be used for reducing power consumption in computing applications.

     (via sciencedaily.com) 

Physicists have demonstrated a new magnetized state in a monolayer of tungsten ditelluride. This material of one-atom thickness has an insulating interior but a conducting edge, which has important implications for controlling electron flow in nanodevices.

     (via sciencedaily.com) 

How do different materials react to the impact of ions? This is a question that plays an important role in many areas of research -- for example in nuclear fusion research, when the walls of the fusion reactor are bombarded by high-energy ions. However, it is difficult to understand the temporal sequence of such processes. A research group has now succeeded in analyzing on a time scale of one femtosecond what happens to the individual particles involved when an ion penetrates materials such as graphene or molybdenum disulphide.

     (via sciencedaily.com) 

Researchers have used an atomically thin material to build a device that can change the color of laser beams. Their microscopic device -- a fraction of the size of conventional color converters -- may yield new kinds of ultra-small optical circuit chips and advance quantum optics.

     (via sciencedaily.com) 

Superconductors are the key to lossless current flow. However, the realization of superconducting diodes has only recently become an important topic of fundamental research. An international research team has now succeeded in reaching a milestone: the demonstration of an extremely strong superconducting diode effect in a single two-dimensional superconductor.

     (via sciencedaily.com) 

An international research team has detected novel quantum effects in high-precision studies of natural double-layer graphene. This research provides new insights into the interaction of the charge carriers and the different phases, and contributes to the understanding of the processes involved.