Showing 20 articles starting at article 321

< Previous 20 articles        Next 20 articles >

Categories: Ecology: Trees, Physics: Acoustics and Ultrasound

Return to the site home page

     (via sciencedaily.com) 

The forensic-voice-comparison system, based on state-of-the-art automatic-speaker-recognition technology, outperformed all the listeners.

     (via sciencedaily.com)     Original source 

Woody climbing plants, known as lianas, are more likely to infest smaller trees in Malaysian forests and therefore stop them growing to their full potential, which may have implications for climate change.

     (via sciencedaily.com)     Original source 

A recent experiment provides evidence of a bark beetle species' agricultural capability. The fruit-tree pinhole borer can suppress the growth of weed fungi and promote food fungi.

     (via sciencedaily.com) 

Researchers have developed a machine-learning technique that captures and models the underlying acoustics of a scene from a limited number of sound recordings. The system can accurately simulate what any sound, like a song, would sound like if a person were to walk around to different locations in a scene.

     (via sciencedaily.com) 

When two musical notes are played simultaneously, the human ear can perceive weak additional tones called combination tones. While less perceivable, objective combination tones are also generated by some musical instruments. Researchers have now used violins to explore these rarely studied objective combination tones. They found that the combination tones produced by higher-quality violins were much stronger and clearly audible and powerful air resonance and violin sound quality are linked. The higher-quality violins produced a stronger air resonance due to several factors, including structural material and crafting techniques.

     (via sciencedaily.com) 

Researchers have created a newborn hearing screening system that uses cheap earbuds and a smartphone instead of an expensive commercial device.

     (via sciencedaily.com)     Original source 

Scientists conducted a 7-year study on seedling recruitment and mortality in a national park in Chiang Mai, in northern Thailand. During the study period, an extremely strong El Niño event occurred, leading to a stronger and longer drought than normal. Seasonally dry tropical forests (SDTFs), which experience an annual dry season, are considered drought-tolerant. Nevertheless, the study found that seedling mortality increased in SDTFs when severe and prolonged drought occurred.

     (via sciencedaily.com)     Original source 

Scientists have developed a method for the direct observation of fine roots, which control the uptake of nutrients and water by trees. This provides a valuable addition to the existing knowledge of carbon and nutrient cycling in the forest floor, leading to further understanding of the carbon cycle from the view point of initial carbon input into the soil and aiding forest management and soil conservation.

     (via sciencedaily.com)     Original source 

Plastic sheets coated with an Eu3+ film that converts UV light to red light were able to accelerate growth of vegetal plants and trees.

     (via sciencedaily.com) 

A new study has shed new light on a mysterious, unpredictable and potentially devastating kind of astrophysical event.

     (via sciencedaily.com)     Original source 

Danes shuttle nearly a million tons of garden waste from their gardens every year. But we would be doing the climate a great service if we just left it alone, according to the new calculations. At the same time, leaves and other garden waste are a boon for backyard biodiversity and soil.

     (via sciencedaily.com)     Original source 

Researchers found thousands of seedlings growing after recent fires in Montana, especially at sites with cooler, damper conditions -- often found in the shade of the dead trees and upper canopy, as well as on the north side of mountains with higher elevations and more undergrowth. Researchers found fewer seedlings at sites with less shade and drier, hotter conditions.

     (via sciencedaily.com) 

A research team has developed a skin-attachable auditory sensor, which recognizes human voices in noisy environments and when users wear facemasks. The new sensor will be useful in microphones that facilitate communication in disaster situations and for healthcare devices that diagnose respiratory diseases.

     (via sciencedaily.com) 

Study shows that not only are loud vehicles flying overhead a cause of noise pollution-related stress, the effect of that stress remains on the body even after noise levels have decreased.

     (via sciencedaily.com) 

Jazz must swing -- jazz musicians agree on that. However, even 100 years after the beginnings of jazz, it is still unclear what exactly constitutes the swing feel. With a sophisticated experiment and data analyses on more than 450 well-known jazz solos, physicists together with psychologists have unraveled a secret of swing. They were able to demonstrate that certain systematic deviations in timing are a key component of swing. These microtiming deviations are so small that they are not perceived as such even by professional jazz musicians, who nonetheless are using them unconsciously.

     (via sciencedaily.com) 

The risk of transmission from an infected person on a wind instrument is generally much lower than for people who sing or speak, provided that one spends the same amount of time in their vicinity, according to a new study.

     (via sciencedaily.com) 

Researchers have developed cutting-edge technology to diagnose patients with heart failure in record time. The state-of-the-art technology uses magnetic resonance imaging (MRI) to create detailed 4D flow images of the heart. But unlike a standard MRI scan, which can take up to 20 minutes or more, the new 4D heart MRI scan takes just eight minutes.

     (via sciencedaily.com) 

Researchers develop a method to identify aortic valve dysfunction using complex network analysis that is accurate, simple to use, and low-cost. They used heart sound data to create a complex network of connected points, which was split into sections, and each part was represented with a node. If the sound in two portions was similar, a line was drawn between them. In a healthy heart, the graph showed two distinct clusters of points, with many nodes unconnected. A heart with aortic stenosis contained many more correlations and edges.

     (via sciencedaily.com) 

Abundant internet claims about the acoustic power of the Saturn V suggest that it melted concrete and lit grass on fire over a mile away, but such ideas are undeniably false. Researchers used a physics-based model to estimate the rocket's acoustic levels and obtained a value of 203 decibels, which matched the limited data from the 1960s. So, while the Saturn V was extremely loud, that kind of power is nowhere near enough to melt concrete or start grass fires.

     (via sciencedaily.com) 

Orchestral ensembles have faced many challenges when starting to perform again during the COVID pandemic, and contamination is a chief concern: specifically, whether wind instruments are vectors of contamination through aerosol dispersion. Researchers worked with musicians to deepen our understanding of how much aerosol is produced and dispersed by wind instruments. They used visualization to characterize the flow, tracked fog particles in the air, and measured aerosol concentration from wind instruments with a particle counter. Then they combined these to develop an equation to describe aerosol dispersion.