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  2. Wave packet - Wikipedia

    en.wikipedia.org/wiki/Wave_packet

    A looped animation of a wave packet propagating without dispersion: the envelope is maintained even as the phase changes. In physics, a wave packet (also known as a wave train or wave group) is a short burst of localized wave action that travels as a unit, outlined by an envelope.

  3. Wavelet packet decomposition - Wikipedia

    en.wikipedia.org/wiki/Wavelet_packet_decomposition

    Wavelet Packet Decomposition is a powerful signal processing technique that offers a multi-resolution analysis of the timber's moisture content. This approach allows for a detailed examination of the signal at different frequency bands, providing a more comprehensive understanding of the moisture distribution within the material.

  4. Periodic travelling wave - Wikipedia

    en.wikipedia.org/wiki/Periodic_travelling_wave

    In some (unusual) cases both end points of a branch (family) of periodic travelling wave solutions are homoclinic solutions, [37] in which case one must use an external starting point, such as a numerical solution of the partial differential equations. Periodic travelling wave stability can also be calculated numerically, by computing the spectrum.

  5. Charge density wave - Wikipedia

    en.wikipedia.org/wiki/Charge_density_wave

    The effect is somewhat analogous to the standing wave in a guitar string, which can be viewed as the combination of two interfering, traveling waves moving in opposite directions (see interference (wave propagation)). The CDW in electronic charge is accompanied by a periodic distortion – essentially a superlattice – of the atomic lattice.

  6. CPK coloring - Wikipedia

    en.wikipedia.org/wiki/CPK_coloring

    pink Several of the CPK colors refer mnemonically to colors of the pure elements or notable compound. For example, hydrogen is a colorless gas, carbon as charcoal , graphite or coke is black, sulfur powder is yellow, chlorine is a greenish gas, bromine is a dark red liquid, iodine in ether is violet, amorphous phosphorus is red, rust is dark ...

  7. 'Lessons in Chemistry' Features an All-Pink 1950s Kitchen ...

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  8. Bragg's law - Wikipedia

    en.wikipedia.org/wiki/Bragg's_law

    It describes how the superposition of wave fronts scattered by lattice planes leads to a strict relation between the wavelength and scattering angle. This law was initially formulated for X-rays, but it also applies to all types of matter waves including neutron and electron waves if there are a large number of atoms, as well as visible light ...

  9. Spartan (chemistry software) - Wikipedia

    en.wikipedia.org/wiki/Spartan_(chemistry_software)

    Spartan is a molecular modelling and computational chemistry application from Wavefunction. [2] It contains code for molecular mechanics, semi-empirical methods, ab initio models, [3] density functional models, [4] post-Hartree–Fock models, [5] thermochemical recipes including G3(MP2) [6] and T1.