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  2. Size consistency and size extensivity - Wikipedia

    en.wikipedia.org/wiki/Size_consistency_and_size...

    In quantum chemistry, size consistency and size extensivity are concepts relating to how the behaviour of quantum-chemistry calculations changes with the system size. Size consistency (or strict separability) is a property that guarantees the consistency of the energy behaviour when interaction between the involved molecular subsystems is nullified (for example, by distance).

  3. Coupled cluster - Wikipedia

    en.wikipedia.org/wiki/Coupled_cluster

    The choice of the exponential ansatz is opportune because (unlike other ansatzes, for example, configuration interaction) it guarantees the size extensivity of the solution. Size consistency in CC theory, also unlike other theories, does not depend on the size consistency of the reference wave function.

  4. Davidson correction - Wikipedia

    en.wikipedia.org/wiki/Davidson_correction

    Davidson correction improves both size consistency and size extensivity of CISD energies. [2] [4] Therefore, Davidson correction is frequently referred to in literature as size-consistency correction or size-extensivity correction. However, neither Davidson correction itself nor the corrected energies are size-consistent or size-extensive.

  5. Category:Quantum chemistry - Wikipedia

    en.wikipedia.org/wiki/Category:Quantum_chemistry

    Size consistency and size extensivity; Slater determinant; Slater integrals; Slater–Condon rules; Slater-type orbital; Slater's rules; Sonochemistry; Spherium; Spin contamination; Spin engineering; Spin transition; Spin-forbidden reactions; State-universal coupled cluster; STO-nG basis sets; Superatom; Symmetry-adapted perturbation theory

  6. Coagulation (water treatment) - Wikipedia

    en.wikipedia.org/wiki/Coagulation_(water_treatment)

    Jar test for coagulation. The dose of the coagulant to be used can be determined via the jar test. [1] [5] The jar test involves exposing same volume samples of the water to be treated to different doses of the coagulant and then simultaneously mixing the samples at a constant rapid mixing time. [5]

  7. Water treatment - Wikipedia

    en.wikipedia.org/wiki/Water_treatment

    Dalecarlia Water Treatment Plant, Washington, D.C. Water treatment is any process that improves the quality of water to make it appropriate for a specific end-use. The end use may be drinking, industrial water supply, irrigation, river flow maintenance, water recreation or many other uses, including being safely returned to the environment.

  8. Fluoride once again scrutinized for possible effect on ... - AOL

    www.aol.com/fluoride-once-again-scrutinized...

    Fluoride has been added to public water supplies in the U.S. for decades. No studies in the U.S. have flagged any measurable decreases in children's cognitive development since fluoride was ...

  9. Membrane technology - Wikipedia

    en.wikipedia.org/wiki/Membrane_technology

    Water treatment is any process that improves the quality of water to make it more acceptable for a specific end-use. Membranes can be used to remove particulates from water by either size exclusion or charge separation. [19] In size exclusion, the pores in the membrane are sized such that only particles smaller than the pores can pass through ...

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