Inglis–Teller equation 1970-01-01
The Inglis–Teller equation is a mathematical expression used in the field of atomic physics and quantum mechanics to describe the behavior of electrons in a quantum system, particularly in the context of atomic ionization processes. It is named after physicists A. R. Inglis and R. Teller, who developed the equation to provide insights into the ionization of atoms in strong electric fields.
Internal conversion (chemistry) 1970-01-01
Internal conversion is a non-radiative process in chemistry and physics where an excited molecule transitions to a lower energy state (usually the ground state) without the emission of a photon. Instead of releasing energy as light, the molecule dissipates the energy as vibrational or thermal energy to its surroundings. In more detail, when a molecule absorbs energy and moves to an excited electronic state, it may undergo various relaxation processes to return to a lower energy state.
Intervalence charge transfer 1970-01-01
Intervalence charge transfer (IVCT) refers to a molecular electronic transition in which an electron is transferred between two metal centers that have different oxidation states within a complex, typically in mixed-valence compounds. This type of charge transfer occurs in systems where there are two or more closely spaced metal ions, and at least one is in a different oxidation state from the others.
Straw man (dummy) 1970-01-01
A "straw man" argument is a rhetorical device or logical fallacy where someone misrepresents, oversimplifies, or distorts an opponent's argument to make it easier to attack or refute. Instead of engaging with the actual position or reasoning of the opponent, the person creates a "straw man" version of the argument that is weaker and easier to refute.
Dutch astrophysicists 1970-01-01
The term "Dutch astrophysicists" generally refers to scientists from the Netherlands who specialize in astrophysics, the branch of astronomy that deals with the physical properties and behavior of celestial objects and phenomena. Dutch astrophysicists have made significant contributions to various areas of research, including cosmology, stellar dynamics, planetary science, and the study of galaxies.
Dutch relativity theorists 1970-01-01
"Dutch relativity theorists" typically refers to a group of physicists and scientists from the Netherlands who have made significant contributions to the theory of relativity, particularly in the early 20th century. The most notable among them is Hendrik Lorentz, who, along with Henri Poincaré, developed key concepts that later influenced Albert Einstein's formulation of special relativity.
Freek J. Beekman 1970-01-01
Freek J. Beekman is not a widely recognized figure as of my last update in October 2023, so specific information about him may not be readily available. It is possible that he could be a person involved in academia, research, or a specialized field, but I would need more context to provide accurate information.
Aimee Johnson 1970-01-01
Aimee Johnson could refer to multiple individuals, but without specific context, it's challenging to determine exactly who you mean. Aimee Johnson might be a common name associated with various professionals, including those in fields like academia, business, or the arts.
Alex Eskin 1970-01-01
Alex Eskin is a prominent mathematician known for his work in the fields of dynamical systems, ergodic theory, and mathematical physics. He has made significant contributions to the understanding of the statistical properties of dynamical systems, particularly in relation to flows on surfaces and the behavior of geodesics. Eskin has also worked on connections between dynamics and geometry, including studies of flat surfaces and their properties.
Axiom schema 1970-01-01
An Axiom schema is a principle or framework in formal logic and mathematics that allows for the description of a set of axioms based on a specified pattern or template. It is typically used in systems of formal logic, such as propositional logic or predicate logic, to generate an infinite number of axioms from a finite number of axiom schemes.
Isomeric shift 1970-01-01
Isomeric shift (or isotopic shift) is a phenomenon observed in nuclear magnetic resonance (NMR), particularly in the context of Mössbauer spectroscopy. It refers to the change in energy of gamma rays emitted or absorbed by a nucleus when it is in a different chemical or physical environment compared to a reference state. In the case of Mössbauer spectroscopy, the isomeric shift is primarily influenced by the electronic environment surrounding the nucleus, particularly the s-electron density at the nucleus.
Doppler cooling 1970-01-01
Doppler cooling is a technique used in atomic and molecular physics to reduce the temperature of a sample, typically of atoms or ions, by using the principles of the Doppler effect. It is particularly effective for cooling atoms to very low temperatures, near the absolute zero threshold, which allows for the study of quantum phenomena and precision measurements. The technique relies on the interaction between laser light and atoms.
Doppler effect 1970-01-01
The Doppler effect is a phenomenon observed when the source of a wave (such as sound or light) is moving relative to an observer. It describes the change in frequency (or wavelength) of the wave as perceived by the observer due to the relative motion. 1. **Sound Waves**: When a sound source moves towards an observer, the sound waves get compressed, resulting in a higher frequency (or pitch) of the sound.
Doppler radio direction finding 1970-01-01
Doppler radio direction finding is a technique used to determine the direction of a radio frequency transmission source by analyzing the Doppler effect on the received signal. The Doppler effect refers to the change in frequency or wavelength of a wave in relation to an observer moving relative to the source of the waves. In the context of radio direction finding, this effect is used to ascertain the location of a transmitter.
Doppler tracking 1970-01-01
Doppler tracking refers to a technique used in various fields, including astronomy, telecommunications, and navigation, to determine the speed and position of an object by analyzing the changes in frequency or wavelength of signals received from that object. The method is based on the Doppler effect, which describes how the frequency of a wave changes for an observer moving relative to the source of the wave.
Ives–Stilwell experiment 1970-01-01
The Ives-Stilwell experiment is an important experiment in the field of relativistic physics that investigates the effects of time dilation, a key concept of Einstein's theory of special relativity. First conducted in the 1930s by American physicists Herbert Ives and Gilbert Stilwell, the experiment focuses on the Doppler effect of light emitted from a moving source. In the experiment, hydrogen ions (H+) are accelerated to high velocities.
Laser Doppler imaging 1970-01-01
Laser Doppler imaging (LDI) is a non-invasive diagnostic technique used to measure and visualize blood flow in tissues. It leverages the Doppler effect, which is the change in frequency or wavelength of light (or sound) in relation to an observer moving relative to the source of the waves. In the context of LDI, a laser beam is directed at the tissue of interest.
Laser Doppler vibrometer 1970-01-01
A Laser Doppler Vibrometer (LDV) is an optical device used to measure vibrations or oscillations of an object without any physical contact. It operates on the principle of the Doppler effect, where the frequency of light reflected off a moving surface changes according to the velocity of that surface.
"On the Coloured Light of Binary Stars and Some Other Stars of the Heavens" is a scientific paper written by the astronomer William Huggins, published in the late 19th century, specifically in 1866. In this work, Huggins discusses the phenomenon of colored light emitted by binary stars and other celestial objects. Huggins was among the pioneers of astrophysics and made significant contributions to the field of spectroscopy—the study of how light interacts with matter.
Photoacoustic Doppler effect 1970-01-01
The photoacoustic Doppler effect is a phenomenon that combines principles of photoacoustic imaging and the Doppler effect to provide information about the movement of scattering particles, such as blood cells, in a medium. It exploits the interaction between light and sound waves to measure dynamics at a microscopic level. ### Key Concepts: 1. **Photoacoustic Effect**: This is the generation of acoustic waves (sound) following the absorption of light (usually from a laser).