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  2. Doppler spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Doppler_spectroscopy

    Doppler spectroscopy (also known as the radial-velocity method, or colloquially, the wobble method) is an indirect method for finding extrasolar planets and brown dwarfs from radial-velocity measurements via observation of Doppler shifts in the spectrum of the planet's parent star. As of November 2022, about 19.5% of known extrasolar planets ...

  3. Doppler broadening - Wikipedia

    en.wikipedia.org/wiki/Doppler_broadening

    A particular case is the thermal Doppler broadening due to the thermal motion of the particles. Then, the broadening depends only on the frequency of the spectral line, the mass of the emitting particles, and their temperature , and therefore can be used for inferring the temperature of an emitting (or absorbing) body being spectroscopically ...

  4. List of unsolved problems in chemistry - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Protein folding problem: Is it possible to predict the secondary, tertiary and quaternary structure of a polypeptide sequence based solely on the sequence and environmental information? Inverse protein-folding problem: Is it possible to design a polypeptide sequence which will adopt a given structure under certain environmental conditions?

  5. Inverse problem - Wikipedia

    en.wikipedia.org/wiki/Inverse_problem

    An inverse problem in science is the process of calculating from a set of observations the causal factors that produced them: for example, calculating an image in X-ray computed tomography, source reconstruction in acoustics, or calculating the density of the Earth from measurements of its gravity field.

  6. AI was everywhere in 2024. Here are the biggest stories of ...

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    In analyzing chemistry, physics, and biology problems, the new model outperformed PhD-level scientists in problem-solving proficiency. However, these advances worry experts in the field.

  7. Ambiguity function - Wikipedia

    en.wikipedia.org/wiki/Ambiguity_function

    In pulsed radar and sonar signal processing, an ambiguity function is a two-dimensional function of propagation delay and Doppler frequency, (,).It represents the distortion of a returned pulse due to the receiver matched filter [1] (commonly, but not exclusively, used in pulse compression radar) of the return from a moving target.

  8. Just How Worried About Social Security Should You Be Right Now?

    www.aol.com/just-worried-social-security-now...

    The biggest problem plaguing Social Security. Social Security is a complex program, and one of the more confusing aspects is the financial state of its trust funds: the Old-Age and Survivors ...

  9. Interferometry - Wikipedia

    en.wikipedia.org/wiki/Interferometry

    Interferometry typically uses electromagnetic waves and is an important investigative technique in the fields of astronomy, fiber optics, engineering metrology, optical metrology, oceanography, seismology, spectroscopy (and its applications to chemistry), quantum mechanics, nuclear and particle physics, plasma physics, biomolecular interactions ...

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