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Eric J. Heller
Eric Johnson "Rick" Heller (born January 10, 1946) is the Abbott and James Lawrence Professor of Chemistry and Professor of Physics at Harvard University. Heller is known for his work on time-dependent quantum mechanics, and also for producing digital art based on the results of his numerical calculations. Early life and education Heller's father was the economist Walter Heller, architect of the first tax cut motivated by fiscal policy, under John F Kennedy. Heller received his BS from the University of Minnesota in 1968, and his PhD in Chemical Physics in 1973 from Harvard University, where he worked with William Reinhardt. Heller was a postdoc at the University of Chicago with Stuart Rice, after which he joined the faculty at the University of California, Los Angeles. Career Heller was a member of the Chemistry faculty at UCLA from 1976 to 1982. In 1981, Heller took a sabbatical at Los Alamos National Laboratory and then stayed on as a staff scientist until 1984 when he ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theoretical Chemistry
Theoretical chemistry is the branch of chemistry which develops theoretical generalizations that are part of the theoretical arsenal of modern chemistry: for example, the concepts of chemical bonding, chemical reaction, valence, the surface of potential energy, molecular orbitals, orbital interactions, and molecule activation. Overview Theoretical chemistry unites principles and concepts common to all branches of chemistry. Within the framework of theoretical chemistry, there is a systematization of chemical laws, principles and rules, their refinement and detailing, the construction of a hierarchy. The central place in theoretical chemistry is occupied by the doctrine of the interconnection of the structure and properties of molecular systems. It uses mathematical and physical methods to explain the structures and dynamics of chemical systems and to correlate, understand, and predict their thermodynamic and kinetic properties. In the most general sense, it is explanation of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Physical Society
The American Physical Society (APS) is a not-for-profit membership organization of professionals in physics and related disciplines, comprising nearly fifty divisions, sections, and other units. Its mission is the advancement and diffusion of knowledge of physics. The society publishes more than a dozen scientific journals, including the prestigious '' Physical Review'' and ''Physical Review Letters'', and organizes more than twenty science meetings each year. APS is a member society of the American Institute of Physics. Since January 2021 the organization has been led by chief executive officer Jonathan Bagger. History The American Physical Society was founded on May 20, 1899, when thirty-six physicists gathered at Columbia University for that purpose. They proclaimed the mission of the new Society to be "to advance and diffuse the knowledge of physics", and in one way or another the APS has been at that task ever since. In the early years, virtually the sole activity of the AP ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alex Dalgarno
Alexander Dalgarno FRS (5 January 1928 – 9 April 2015) was a British physicist who was a Phillips Professor of Astronomy at Harvard University. Biography Alexander Dalgarno was born in London in 1928, and spent his childhood there. He was educated in mathematics and atomic physics at University College, London, earning a Ph.D. in theoretical physics in 1951 under the joint supervision of Harrie Massey and Richard Buckingham. He was an academic at the Queen's University, Belfast from 1951 to 1967 where he worked with Sir David Bates and rose from assistant lecturer to professor. In the 1950s, he laid the foundations for long-range atomic interaction studies which are of critical importance for today's interest in Bose–Einstein condensates. In 1967 he moved to Harvard to join their department of astronomy and held the positions of acting director of Harvard College Observatory, chairman of the department of astronomy, associate director of the Center for Astrophysics Har ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catherine Asaro
Catherine Ann Asaro (born November 6, 1955) is an American science fiction and fantasy author, singer and teacher. She is best known for her books about the Ruby Dynasty, called the Saga of the Skolian Empire. Biography Catherine Asaro was born on November 6, 1955, in Oakland, California, and grew up in El Cerrito, California. She attended Kennedy High School in Richmond, California as part of the Richmond Voluntary Integration Plan. She has a B.S. with highest honors in chemistry from UCLA, and both a master's in physics and a PhD in chemical physics from Harvard University. When not writing and making appearances at conventions and signings, Asaro teaches math, physics, and chemistry. She is the director of the Chesapeake Math Program and has coached various nationally ranked teams with home, private, and public school students, in particular the Chesapeake teams for national tournaments such as the Princeton and Harvard-MIT competitions. She also taught a gifted program i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Quantum Rose
''The Quantum Rose'' is a science fiction novel by Catherine Asaro which tells the story of Kamoj Argali and Skolian Prince Havyrl Valdoria. The book is set in her Saga of the Skolian Empire. It won the 2001 Nebula Award for Best Novel and the 2001 Affaire de Coeur Award for Best Science Fiction. The first third of the novel appeared as a three-part serialization in ''Analog'' magazine in the 1999 May, June and July/August issues. Tor Books published the full novel in 2000. Plot summary ''The Quantum Rose'' is a retelling of the ''Beauty and the Beast'' folktale in a science fiction setting. In the novel, Kamoj Argali, the governor of an impoverished province on the backward planet Balumil, is betrothed to Jax Ironbridge, ruler of a wealthy neighboring province, an arrangement made for political purposes to save her province from starvation and death. Havyrl (Vyrl) Lionstar, a prince of the titular Ruby Dynasty, comes to Balimul as part of a governmental plan to deal with the a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nebula Award
The Nebula Awards annually recognize the best works of science fiction or fantasy published in the United States. The awards are organized and awarded by the Science Fiction and Fantasy Writers of America (SFWA), a nonprofit association of professional science fiction and fantasy writers. They were first given in 1966 at a ceremony created for the awards, and are given in four categories for different lengths of literary works. A fifth category for film and television episode scripts was given 1974–78 and 2000–09, and a sixth category for game writing was begun in 2018. In 2019 SFWA announced that two awards that were previously run under the same rules but not considered Nebula awards—the Andre Norton Award for Middle Grade and Young Adult Fiction and the Ray Bradbury Award for Outstanding Dramatic Presentation—were to be considered official Nebula awards. The rules governing the Nebula Awards have changed several times during the awards' history, most recently in 2010. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freak Waves
Rogue waves (also known as freak waves, monster waves, episodic waves, killer waves, extreme waves, and abnormal waves) are unusually large, unpredictable, and suddenly appearing surface waves that can be extremely dangerous to ships, even to large ones. They are distinct from tsunamis, which are often almost unnoticeable in deep waters and are caused by the displacement of water due to other phenomena (such as earthquakes). A rogue wave appearing at the shore is sometimes referred to as a sneaker wave. In oceanography, rogue waves are more precisely defined as waves whose height is more than twice the significant wave height (''H'' or SWH), which is itself defined as the mean of the largest third of waves in a wave record. Therefore, rogue waves are not necessarily the biggest waves found on the water; they are, rather, unusually large waves for a given sea state. Rogue waves seem not to have a single distinct cause, but occur where physical factors such as high winds and stron ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Few-body Systems
In mechanics, a few-body system consists of a small number of well-defined structures or point particles. Quantum mechanics In quantum mechanics, examples of few-body systems include light nuclear systems (that is, few-nucleon bound and scattering states), small molecules, light atoms (such as helium in an external electric field), atomic collisions, and quantum dots. A fundamental difficulty in describing few-body systems is that the Schrödinger equation and the classical equations of motion are not analytically solvable for more than two mutually interacting particles even when the underlying forces are precisely known. This is known as the few-body problem. For some three-body systems an exact solution can be obtained iteratively through the Faddeev equations. It can be shown that under certain conditions Faddeev equations should lead to Efimov effect. Some special cases of three-body systems are amenable to analytical solutions (or nearly so) - by special treatments - suc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantum Mirage
In physics, a quantum mirage is a peculiar result in quantum chaos. Every system of quantum dynamical billiards will exhibit an effect called ''scarring'', where the quantum probability density shows traces of the paths a classical billiard ball would take. For an elliptical arena, the scarring is particularly pronounced at the foci, as this is the region where many classical trajectories converge. The scars at the foci are colloquially referred to as the "quantum mirage". The quantum mirage was first experimentally observed by Hari Manoharan, Christopher Lutz and Donald Eigler at the IBM Almaden Research Center in San Jose, California in 2000. The effect is quite remarkable but in general agreement with prior work on the quantum mechanics of dynamical billiards in elliptical arenas. Quantum corral The mirage occurs at the foci of a quantum corral, a ring of atoms arranged in an arbitrary shape on a substrate. The quantum corral was demonstrated in 1993 by Lutz, Eigler, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scar (physics)
Quantum scarring refers to a phenomenon where the Quantum state, eigenstates of a classically chaotic quantum system have enhanced Density matrix, probability density around the paths of unstable classical periodic orbits. The instability of the periodic orbit is a decisive point that differentiates quantum scars from the more trivial observation that the probability density is enhanced in the neighborhood of stable periodic orbits. The latter can be understood as a purely classical phenomenon, a manifestation of the Correspondence principle, Bohr correspondence principle, whereas in the former, quantum interference is essential. As such, scarring is both a visual example of quantum-classical correspondence, and simultaneously an example of a (local) quantum suppression of chaos. A classically chaotic system is also Ergodicity, ergodic, and therefore (almost) all of its trajectories eventually explore evenly the entire accessible phase space. Thus, it would be natural to expect tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quantum Chaos
Quantum chaos is a branch of physics which studies how chaos theory, chaotic classical dynamical systems can be described in terms of quantum theory. The primary question that quantum chaos seeks to answer is: "What is the relationship between quantum mechanics and classical chaos?" The correspondence principle states that classical mechanics is the classical limit of quantum mechanics, specifically in the limit as the ratio of Planck's constant to the Action (physics), action of the system tends to zero. If this is true, then there must be quantum mechanisms underlying classical chaos (although this may not be a fruitful way of examining classical chaos). If quantum mechanics does not demonstrate an exponential sensitivity to initial conditions, how can exponential sensitivity to initial conditions arise in classical chaos, which must be the correspondence principle limit of quantum mechanics?''Quantum Signatures of Chaos'', Fritz Haake, Edition: 2, Springer, 2001, , .Michae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Resonance Raman Spectroscopy
Resonance Raman spectroscopy (RR spectroscopy) is a Raman spectroscopy technique in which the incident photon energy is close in energy to an electronic transition of a compound or material under examination. The frequency coincidence (or ''resonance'') can lead to greatly enhanced intensity of the Raman scattering, which facilitates the study of chemical compounds present at low concentrations. Raman scattering is usually extremely weak, since only about 1 in 10 million photons that hit a sample are scattered with a loss ( Stokes) or gain (anti-Stokes) in energy from changes in vibrational energy of the molecules in the sample; the rest of the photons are scattered with no change in energy. Resonance enhancement of Raman scattering requires the incident wavelength (usually from a laser) to be close to that of an electronic transition of the molecules. In larger molecules the change in electron density can be largely confined to one part of the molecule, a chromophore, and in these c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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