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  2. Basis set superposition error - Wikipedia

    en.wikipedia.org/wiki/Basis_set_superposition_error

    As the atoms of interacting molecules (or of different parts of the same molecule - intramolecular BSSE) [1] [2] approach one another, their basis functions overlap. Each monomer "borrows" functions from other nearby components, effectively increasing its basis set and improving the calculation of derived properties such as energy . [ 3 ]

  3. Endomicroscopy - Wikipedia

    en.wikipedia.org/wiki/Endomicroscopy

    Endomicroscopy is a technique for obtaining histology-like images from inside the human body in real-time, [1] [2] [3] a process known as ‘optical biopsy’. [ 4 ] [ 5 ] It generally refers to fluorescence confocal microscopy , although multi-photon microscopy and optical coherence tomography have also been adapted for endoscopic use.

  4. Confocal endoscopy - Wikipedia

    en.wikipedia.org/wiki/Confocal_endoscopy

    Confocal endoscopy, or confocal laser endomicroscopy (CLE), is a modern imaging technique that allows the examination of real-time microscopic and histological features inside the body. In the word "endomicroscopy", endo- means "within" and -skopein means "to view or observe".

  5. Spin contamination - Wikipedia

    en.wikipedia.org/wiki/Spin_contamination

    In computational chemistry, spin contamination is the artificial mixing of different electronic spin-states.This can occur when an approximate orbital-based wave function is represented in an unrestricted form – that is, when the spatial parts of α and β spin-orbitals are permitted to differ.

  6. Observational error - Wikipedia

    en.wikipedia.org/wiki/Observational_error

    If you consider an experimenter taking a reading of the time period of a pendulum swinging past a fiducial marker: If their stop-watch or timer starts with 1 second on the clock then all of their results will be off by 1 second (zero error).

  7. Order of accuracy - Wikipedia

    en.wikipedia.org/wiki/Order_of_accuracy

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  8. Westgard rules - Wikipedia

    en.wikipedia.org/wiki/Westgard_Rules

    They are a set of modified Western Electric rules, developed by James Westgard and provided in his books and seminars on quality control. [1] They are plotted on Levey–Jennings charts, wherein the X-axis shows each individual sample, and the Y-axis shows how much each one differs from the mean in terms of standard deviation (SD). The rules ...

  9. Free-energy perturbation - Wikipedia

    en.wikipedia.org/wiki/Free-energy_perturbation

    Free-energy perturbation (FEP) is a method based on statistical mechanics that is used in computational chemistry for computing free-energy differences from molecular dynamics or Metropolis Monte Carlo simulations. The FEP method was introduced by Robert W. Zwanzig in 1954. [1]