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15 hours ago · Graphene is the only form of carbon (or solid material) in which every atom is available for chemical reaction from two sides (due to the 2D structure). Atoms at the edges of a graphene sheet have special chemical reactivity. Graphene has the highest ratio of edge atoms of any allotrope. Defects within a sheet increase its chemical reactivity.
15 hours ago · The law Every physical body spontaneously and continuously emits electromagnetic radiation and the spectral radiance of a body, B ν, describes the spectral emissive power per unit area, per unit solid angle and per unit frequency for particular radiation frequencies. The relationship given by Planck's radiation law, given below, shows that with increasing temperature, the total radiated ...
15 hours ago · The Planck constant, or Planck's constant, denoted by , [1] is a fundamental physical constant [1] of foundational importance in quantum mechanics: a photon 's energy is equal to its frequency multiplied by the Planck constant, and the wavelength of a matter wave equals the Planck constant divided by the associated particle momentum.
15 hours ago · Chaos theory is an interdisciplinary area of scientific study and branch of mathematics. It focuses on underlying patterns and deterministic laws of dynamical systems that are highly sensitive to initial conditions. These were once thought to have completely random states of disorder and irregularities. [1]
15 hours ago · Definition. Fatigue in a medical context is used to cover experiences of low energy that are not caused by normal life. A 2021 review proposed a definition for fatigue as a starting point for discussion: "A multi-dimensional phenomenon in which the biophysiological, cognitive, motivational and emotional state of the body is affected resulting in significant impairment of the individual's ...
- Exhaustion, weariness, tiredness, lethargy, listlessness
- Internal medicine and most other specialities
15 hours ago · Myalgic encephalomyelitis/chronic fatigue syndrome ( ME/CFS) is a debilitating long-term medical condition. People with ME/CFS experience delayed worsening of the illness after minor physical or mental activity, which is the hallmark symptom of the illness. [10] Other core symptoms are a greatly reduced ability to do tasks that were previously ...
15 hours ago · Cholera ( / ˈkɒlərə /) is an infection of the small intestine by some strains of the bacterium Vibrio cholerae. [4] [3] Symptoms may range from none, to mild, to severe. [3] The classic symptom is large amounts of watery diarrhea lasting a few days. [2] Vomiting and muscle cramps may also occur. [3]
