Automotive
Air taxis hold the promise to revolutionize air transportation. NASA is working to make this vision a reality, collaborating with industry to reduce aircraft noise in our communities.
Dec 7, 2023
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15
Machine learning & AI
The pronounced positive confidence bias that is a characteristic and apparently irrational trait of human decision-making has been replicated and dissected using an artificial intelligence (AI) model. The unnerving result, ...
Nov 29, 2023
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85
Engineering
Cantilever fans move air through a flapping action, similar to hand-fans. Commercially available, they are combined with a piezoelectric bender, which provides their motive force. These fans are low noise, low power and have ...
Engineering
Airplane engines are loud—just ask anyone who lives near an airport. Increased air traffic from next-generation aircraft has the potential for even more disruptive noise. Researchers and engineers at NASA are working to ...
Nov 16, 2023
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28
Energy & Green Tech
A new report by the University of Southampton has been launched to assess the relationship between measures aimed at enhancing ship energy efficiency and underwater radiated noise emissions.
Nov 16, 2023
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10
Engineering
Researchers from Binghamton University and Northeastern University have found a way to improve the tiny sensors used in everything from cellphones and smart watches to biomedical devices.
Nov 15, 2023
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45
Engineering
Nigeria's new works minister, David Umahi, is pushing for the use of rigid pavement in road construction, as against the flexible pavement predominantly in use. This, as the minister noted, is due to the precarious state ...
Nov 9, 2023
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4
Engineering
Researchers at the University of California, Davis, have developed a proof-of-concept sensor that may usher in a new era for millimeter wave radars. In fact, they call its design a "mission impossible" made possible.
Oct 2, 2023
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144
Security
By completely rethinking the way that most Artificial Intelligence (AI) systems protect against attacks, researchers at EPFL's School of Engineering have developed a new training approach to ensure that machine learning models, ...
Sep 28, 2023
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58
Computer Sciences
It is often a nuisance for residents living near railroad lines—and such a multi-faceted challenge for experts that there should be more than one word for "railroad noise." Sounds from steel wheels on rough or smoother ...
Sep 21, 2023
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1
In common use, the word noise means any unwanted sound. In both analog and digital electronics, noise is random unwanted perturbation to a wanted signal; it is called noise as a generalisation of the acoustic noise ("static") heard when listening to a weak radio transmission with significant electrical noise. Signal noise is heard as acoustic noise if the signal is converted into sound (e.g., played through a loudspeaker); it manifests as "snow" on a television or video image. High noise levels can block, distort, change or interfere with the meaning of a message in human, animal and electronic communication.
In signal processing or computing it can be considered random unwanted data without meaning; that is, data that is not being used to transmit a signal, but is simply produced as an unwanted by-product of other activities. "Signal-to-noise ratio" is sometimes used to refer to the ratio of useful to irrelevant information in an exchange.
In biology, noise can describe the variability of a measurement around the mean, for example transcriptional noise describes the variability in gene activity between cells in a population.
In many cases, the special case of thermal noise arises, which sets a fundamental lower limit to what can be measured or signaled and is related to basic physical processes described by thermodynamics, some of which are expressible by simple formulae.
In some fields, noise means unwanted information or data that is not relevant to the hypothesis or theory being investigated or tested.
This text uses material from Wikipedia, licensed under CC BY-SA
