|
Archief:
maandag
dinsdag
woensdag
donderdag
vrijdag
zaterdag
zondag
[ Home ] [ Dagbladen ] [ Vacatures ] [ Weersberichten ] |
|
Archief:
maandag
dinsdag
woensdag
donderdag
vrijdag
zaterdag
zondag
[ Home ] [ Dagbladen ] [ Vacatures ] [ Weersberichten ] |
Researchers have discovered a way to tune some semiconductors to reduce the amount of energy needed to eject electrons. The approach works by placing a bilayer coating of an insulator and graphene on top of the semiconductor then applying a voltage between the semiconductor and graphene. This bilayer approach could improve the efficiency of electromechanical devices and electron accelerators. 
PNNL researchers are investigating the cybersecurity vulnerabilities of an increasingly smart food and agriculture sector. 
The FDA has announced a new medical device product classification "whole room microbial reduction device" which establishes FDA regulation of UV robots intended to reduce the number of pathogens in unoccupied patient rooms, operating rooms and other areas in healthcare facilities where non-critical medical devices are present. 
In Journal of Applied Physics, researchers describe an acoustic metasurface that uses pingpong balls, with small holes punctured in each, as Helmholtz resonators to create inexpensive but effective low-frequency sound insulation. The coupling between two resonators led to two resonance frequencies, and more resonant frequencies meant the device was able to absorb more sound. At the success of two coupled resonators, the researchers added more, until their device resembled a square sheet of punctured pingpong balls, multiplying the number of resonant frequencies that could be absorbed. 
In Review of Scientific Instruments, scientists developed a microwave microstrip line planar resonator sensor tool to detect water adulteration in honey. The tool is compact, cost-effective, and easily fabricated. The microstrip line resonator sensor is fabricated on a dielectric substrate, which is an insulator that can efficiently support electrostatic fields, such as ceramic or glass. The team tested honey samples with varying water content and found that the sensor's resonance frequency consistently decreases with increased added water content. 
Within a neighboring dwarf galaxy known as the Small Magellanic Cloud (SMC) lies a dramatic region of star birth - NGC 346, shown here. As the brightest and largest star-forming region in the SMC, it has been studied intensely by a variety of telescopes. NASA's Hubble Space Telescope showed a visible-light view filled with thousands of stars. More recently, NASA's James Webb Space Telescope offered a near-infrared vista highlighting both cool and warm dust. Now, Webb has turned its mid-infrared gaze to NGC 346, revealing streamers of gas and dust studded with bright patches filled with young protostars. 
UC San Diego engineers developed electronic "stickers" that measure the force exerted by one object upon another. The force stickers are wireless, run without batteries and fit in tight spaces, making them versatile for a wide range of applications, from surgical robots to smart implants and inventory tracking. 
Scientists using natural tracers off Queensland's coast have discovered the source of previously unquantified nitrogen and phosphorous having a profound environmental impact on the Great Barrier Reef. 
The hunt for the world's most ancient mammals descended into academic warfare in the seventies, researchers from the University of Bristol have discovered. 
Scientists have found that concrete's compressive strength can be increased by 4,1% and its flexural strength by 3,4% by adding a small amount of coconut shell (only 5%). In doing so, the material's performance increased by 6,1% compared to clear concrete. 
Genes sfrp and smoothened are crucially important for regeneration of lost organs. Scientists have found out that regeneration of sea cucumbers depends on genes sfrp (sfrp1/2/5, sfrp3/4) and gene smo. 
Biologists have analyzed about 200 articles dedicated to composition of connective tissue (Extracellular Matrix) of echinoderms. That has enabled them for the first time to compare the composition of extracellular matrix of echinoderms and vertebrates. 
The "Margaritaville" in Jimmy Buffett's famous song isn't a real place, but it's long been associated with the Florida Keys. This string of tropical islands is home to the only living coral barrier reef in the continental US, along with many animals found nowhere else in the world. 
A team of researchers from Queen Mary University of London and the University of Campinas in Brazil has found that tropical forest ecosystems are more reliant on aquatic insects than temperate forest ecosystems and are therefore more vulnerable to disruptions to the links between land and water. 
Utrecht University geologist Suzanna van de Lagemaat has reconstructed a massive and previously unknown tectonic plate that was once one-quarter the size of the Pacific Ocean. Her colleagues in Utrecht had predicted its existence over 10 years ago based on fragments of old tectonic plates found deep in the Earth's mantle. 
An international team of scientists have discovered a huge spike in radiocarbon levels 14,300 years ago by analysing ancient tree-rings found in the French Alps.