Atira asteroids, also known as Apohele asteroids, are a group of asteroids that have orbits entirely within the orbit of Earth. This means that their maximum distance from the Sun is less than that of the Earth's average distance from the Sun, which is about 1 astronomical unit (AU). Atira asteroids are named after the first discovered member of this group, 163693 Atira, which was identified in 2003.
In astrology, asteroids are small celestial bodies that orbit the Sun, primarily located in the asteroid belt between Mars and Jupiter. While traditional astrology primarily focuses on the planets in our solar system, the inclusion of asteroids has gained popularity among astrologers in recent decades. Asteroids are believed to carry specific meanings and energies that can influence a person's birth chart, much like planets do.
Asteroid impact prediction is the process of assessing the likelihood that an asteroid will collide with Earth or another celestial body. This involves a variety of scientific techniques and methods to track and calculate the orbits of asteroids, analyze their physical properties, and predict their potential paths over time. Key components of asteroid impact prediction include: 1. **Observational Data**: Astronomers use telescopes and other instruments to detect and monitor asteroids.
Apollo asteroids are a group of near-Earth asteroids that have orbits that cross Earth's orbit. They are named after the first identified member of this group, 1862 Apollo, discovered in 1932. Apollo asteroids have semi-major axes greater than 1 astronomical unit (AU), which is the average distance from the Earth to the Sun, and they typically have eccentric orbits that bring them into close proximity to Earth.
The Amor asteroids are a group of near-Earth asteroids that have orbits that are primarily outside Earth's orbit but can come close to it. The term "Amor asteroid" refers to those objects that do not cross Earth's orbit but can approach it closely. They are named after the asteroid 1221 Amor, which was discovered in 1932.
The American Physical Society (APS) honors members who have made significant contributions to the field of physics by electing them as Fellows. Each year, various physicists are nominated and selected based on their accomplishments and contributions to physical science and research. The list of APS Fellows is extensive and covers many years.
The American Physical Society (APS) recognizes outstanding contributions to the field of physics by electing members to the status of Fellow. The list of APS Fellows includes physicists who have made significant contributions in various areas of physics, including research, education, and outreach.
The List of American Physical Society (APS) Fellows from 1972 to 1997 refers to the compilation of individuals who were recognized by the APS for their contributions to the field of physics during that period. Being named a Fellow of the American Physical Society is a prestigious honor bestowed upon members who have made significant advancements in the field of physics, including research, teaching, and service.
The List of American Physical Society Fellows (1921–1971) refers to a compilation of individuals who were recognized as Fellows of the American Physical Society (APS) during those years. The APS, founded in 1899, established the fellowship program in 1921 to honor members for their exceptional contributions to the field of physics.
A supersolid is a state of matter that exhibits properties of both solids and superfluids. In a supersolid, the material has a crystalline structure, which is characteristic of solids, but it also exhibits superfluid-like behavior, such as the ability to flow without viscosity. This fascinating phase of matter combines the rigidity of a solid with the frictionless flow of a superfluid, allowing it to display unique and counterintuitive characteristics.
Helimagnetism is a type of magnetic ordering that occurs in certain materials, characterized by a helical arrangement of magnetic moments (spins) within a spiral structure. In helimagnetic materials, the magnetic spins rotate in a helical fashion as a function of position, leading to a three-dimensional, non-collinear arrangement. This is different from ferromagnetism, where spins are aligned parallel to each other, and antiferromagnetism, where adjacent spins are aligned in opposite directions.
Vectra is a brand name for a type of high-performance thermoplastic known as liquid crystal polymer (LCP). These materials are notable for their exceptional thermal and chemical stability, as well as their mechanical strength. Vectra is often used in applications that demand materials capable of withstanding high temperatures and harsh environments, such as in the automotive, aerospace, and electronics industries.
Twisted nematic field effect refers to a configuration commonly used in liquid crystal displays (LCDs) that involves a specific arrangement of liquid crystal molecules. In particular, the "twisted nematic" (TN) structure is characterized by the orientation of liquid crystal molecules being twisted at an angle across a thin layer of liquid crystal material. Here's a breakdown of the concepts involved: 1. **Liquid Crystals**: These materials have properties between those of liquids and solid crystals.
Thermotropic crystals are a type of liquid crystal that exhibit changes in their optical properties in response to variations in temperature. These materials can transition between different phases, such as liquid crystal, isotropic liquid, and crystalline solid states, depending on the temperature conditions. In thermotropic liquid crystals, the molecular arrangement changes with temperature, leading to different phases with distinct optical characteristics, such as birefringence.
The term "tactoid" can refer to a few different concepts depending on the context, but it is primarily used in materials science and chemistry. In this context, a tactoid refers to a specific arrangement of materials within a composite or dispersed system, particularly in relation to colloidal structures or liquid crystals.
Photoalignment is a process used in material science and engineering, particularly in the field of liquid crystal displays (LCDs) and photonic devices. It involves the alignment of molecular or polymeric materials through exposure to light, usually UV (ultraviolet) or polarized light. The technique is based on the principle that light can influence the orientation of certain materials, typically those that are photosensitive or have photoresponsive properties.
Paranematic susceptibility refers to the response of a nematic liquid crystal to an external electric or magnetic field, particularly in terms of its alignment or orientation. In the context of liquid crystals, "paranematic" generally refers to a state where the liquid crystal molecules are predominantly aligned in a certain direction but not as ordered as in a fully nematic phase. The susceptibility aspect indicates how much the orientation of the liquid crystal is affected by the external field.
Para-Azoxyanisole, also known as p-(methoxyphenylazo)anisole, is a chemical compound belonging to the class of azo compounds. Azo compounds are characterized by the presence of a functional group that contains a nitrogen-nitrogen double bond (N=N) linking two aromatic rings.
Nematicon is a type of optical switch that uses liquid crystals to control the passage of light. Typically, it consists of a device that can manipulate the light's properties, such as its intensity or phase, by adjusting the orientation of liquid crystal molecules in response to an electric field. This technology leverages the unique characteristics of liquid crystals, allowing for rapid switching and potential applications in telecommunications, displays, and other optical systems.
Mesogens are a type of molecule that play a crucial role in the field of liquid crystals. Specifically, they are the mesogenic units that possess elongated shapes and are responsible for the liquid crystalline properties of materials. These molecules can orient themselves in a way that allows them to exhibit both liquid and solid characteristics, depending on temperature and other conditions. Generally, mesogens contain a rigid core, often composed of aromatic rings, along with flexible alkyl chains.