Search results for quartz

Environment Jan 3, 2024

When you sit down to build a sandcastle, take a look around you: The beach is already sculpting

Arenicola, or lugworms, make some of the most beautiful structures on the beach. Little piles of wet sand are cast in a swirl from their rear end as part of their feeding cycle.

Earth Sciences Dec 27, 2023

Arabia's alluvial fans grow and decay with Earth's orbital cycles

Erosion of Earth's topography entrains sediment in rivers flowing across mountains, canyons and other naturally steep landscapes within the catchment. This silt, sand and gravel is transported variably by suspension in the ...

Analytical Chemistry Dec 15, 2023

Study shows how Rembrandt broke new ground with lead-based impregnation of canvas for The Night Watch

New research has revealed that Rembrandt impregnated the canvas for his famous 1642 militia painting "The Night Watch" with a lead-containing substance even before applying the first ground layer. Such lead-based impregnation ...

Environment Dec 6, 2023

Potentially harmful chemical byproducts left behind when sunlight breaks down ocean plastics

Northeastern researchers found in 2021 that an estimated 4 million to 10 million tons of plastic carbon enter the ocean each year. Much of it ends up floating in subtropical currents.

Optics & Photonics Nov 30, 2023

Study finds more stable clocks could measure quantum phenomena, including the presence of dark matter

The practice of keeping time hinges on stable oscillations. In a grandfather clock, the length of a second is marked by a single swing of the pendulum. In a digital watch, the vibrations of a quartz crystal mark much smaller ...

Earth Sciences Nov 21, 2023

Libyan desert's yellow glass: How we discovered the origin of these rare and mysterious shards

The Great Sand Sea Desert stretches over an area of 72,000kmĀ² linking Egypt and Libya. If you find yourself in a particular part of the desert in south-east Libya and south-western parts of Egypt, you'll spot pieces of yellow ...

General Physics Nov 14, 2023

Putting sound waves to work to create safer public spaces

The risk of hearing loss does not come just from loud machinery or other obvious noise. It can also affect people in public environments like theaters and concert halls. Absorbing this excess sound to make public environments ...

Ecology Oct 27, 2023

A mystery disease hit South Africa's pine trees 40 years ago: New DNA technology has found the killer

In the 1970s and 1980s, pine trees growing in various forestry plantations in South Africa's Western Cape province began to die in patches. These trees succumbed to a mysterious root disease and the patches expanded gradually. ...

Earth Sciences Oct 27, 2023

Alpine rock reveals dynamics of plate movements in Earth's interior

Geoscientists analyze rocks in mountain belts to reconstruct how they once moved downward into the depths and then returned to the surface. This history of burial and exhumation sheds light on the mechanisms of plate tectonics ...

Optics & Photonics Oct 24, 2023

Diffraction-limited visible imaging for large aperture telescopes

A new publication from Opto-Electronic Advances discusses diffraction-limited visible imaging for large aperture telescopes.

page 2 from 40