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The Sérsic profile is a mathematical function used to describe the brightness distribution of astronomical objects, particularly galaxies and bulges of galaxies. It was introduced by the Argentine astronomer José Sérsic in 1963. This profile is an extension of the simpler exponential (for disk-like structures) and de Vaucouleurs (for elliptical structures) profiles, allowing for a more flexible representation of the surface brightness of an object.

Velocity dispersion is a measure of the range of velocities within a group of objects, such as stars in a galaxy or galaxies in a cluster. It quantifies how much the velocities of the objects deviate from the average velocity of the group. In a more technical sense, it is defined as the standard deviation of the velocities of the objects in the sample. In astrophysics, velocity dispersion is an important metric because it provides insights into the dynamics and mass distribution of celestial bodies.

Fission products are the nuclei that are produced when a heavy nucleus undergoes nuclear fission. During the fission process, a heavy atomic nucleus, such as uranium-235 or plutonium-239, absorbs a neutron and becomes unstable, leading it to split into two or more smaller nuclei. This splitting releases a significant amount of energy, along with additional neutrons that can further propagate the fission reaction.

Rashid Sunyaev is a prominent astrophysicist known for his significant contributions to cosmology and astrophysics. Born on March 1, 1943, in Russia, he is best known for his work on the Sunyaev-Zel'dovich effect, which describes the distortion of the cosmic microwave background radiation caused by the passage of the radiation through hot gas, typically found in galaxy clusters.

In 2005, several computer companies and technology firms were disestablished or ceased operations. Here are a few notable examples: 1. **Apple's PowerComputing** - While the company was established in the 1990s, it became defunct in 2005. Power Computing was known for making Macintosh clones but struggled to compete after Apple moved to a more closed ecosystem.

Euclidean geometry is a mathematical system that describes the properties and relationships of points, lines, planes, and figures in a two-dimensional or three-dimensional space based on the postulates and theorems formulated by the ancient Greek mathematician Euclid around 300 BCE.

The Vis-viva equation is an important equation in orbital mechanics that relates the speed of an object in orbit to its distance from the center of the body it is orbiting and the gravitational parameter of that body. It provides a way to calculate the orbital velocity of an object at any point in its orbit, given its distance from the center of mass of the central body.

Josef Meixner may refer to a specific individual or could relate to various contexts, such as a notable person in academia, the arts, or business, but I don't have specific information on a person named Josef Meixner.

Maximilien Toepler does not appear to be a widely recognized historical figure, concept, or entity as of my last knowledge update in October 2023. It's possible that you may be referring to a specific person or subject that is not well-documented or known outside of a niche context.

Otto Willi Gail (1896–1963) was a German composer and theorist known for his contributions to music, particularly in the fields of harmonic theory and musical forms. He explored various aspects of music, including structural analysis and innovative compositional techniques. Gail's works often reflect a deep understanding of music theory, and he was keen on integrating contemporary ideas into traditional forms.

Paul Eugen Sieg was a German mathematician known for his contributions to various fields, including mathematics and logic. He is particularly noted for his work on mathematics education and the development of mathematical logic.

Paul Söding is a prominent German mathematician known for his contributions in the fields of analysis and mathematical modeling. He has worked extensively on topics such as inverse problems, mathematical physics, and non-linear analysis. Additionally, he has been involved in educational initiatives and has published various papers and books in his areas of expertise.

Petra Rudolf is not a widely recognized figure or term as of my last knowledge update in October 2023. It's possible that it could refer to a specific individual, a fictional character, or be a less well-known topic.

Stephan W. Koch is a physicist known for his work in the field of condensed matter physics and quantum physics. He has contributed to various areas, including quantum transport, complex quantum systems, and nonequilibrium physics. He has published numerous research papers and is recognized within the scientific community for his contributions.

Jitendra Nath Goswami may refer to a notable individual, but without additional context, it's challenging to provide specific information. There are many individuals with that name, and it could pertain to various fields such as academia, art, or local community services.

Kasturi Lal Chopra refers to a specific case related to the Indian legal system, particularly in connection with contract law and the enforcement of agreements. The case highlights the principles of offer, acceptance, consideration, and the binding nature of contracts. It can be used as a reference point in discussions about contractual obligations and disputes.

Sergey Lebedev is a prominent Russian scientist known for his contributions to the fields of mathematics and computer science, particularly in areas related to computational complexity, algorithm theory, and cryptography. His work often involves the theoretical foundations of computing, exploring how algorithms function and their efficiency.

Valery Alekseyevich Legasov was a prominent Soviet chemist and a key figure in the response to the Chernobyl nuclear disaster, which occurred in April 1986. He was born on September 1, 1936, and passed away on April 27, 1988. Legasov played a critical role in investigating the causes of the disaster and in the development of responses to mitigate its aftermath.

The Randles–Sevcik equation is a fundamental relationship in electrochemistry that describes the current response of a redox-active species undergoing a diffusion-controlled process during a cyclic voltammetry experiment. It relates the peak current (\(I_p\)) measured during the voltammetric scan to various parameters, including the concentration of the active species, the scan rate, and the diffusion coefficient.