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  2. DFTB - Wikipedia

    en.wikipedia.org/wiki/DFTB

    The Density Functional Based Tight Binding method is an approximation to density functional theory, which reduces the Kohn-Sham equations to a form of tight binding related to the Harris functional. The original [ 1 ] approximation limits interactions to a non-self-consistent two center hamiltonian between confined atomic states.

  3. Mass concentration (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Mass_concentration_(chemistry)

    In chemistry, the mass concentration ρ i (or γ i) is defined as the mass of a constituent m i divided by the volume of the mixture V. [1]= For a pure chemical the mass concentration equals its density (mass divided by volume); thus the mass concentration of a component in a mixture can be called the density of a component in a mixture.

  4. Cubic equations of state - Wikipedia

    en.wikipedia.org/wiki/Cubic_equations_of_state

    Solving the equations in Wertheim's theory can be complicated, but simplifications can make their implementation less daunting. Briefly, a few extra steps are needed to compute given density and temperature. For example, when the number of hydrogen bonding donors is equal to the number of acceptors, the ESD equation becomes:

  5. Problem set - Wikipedia

    en.wikipedia.org/wiki/Problem_set

    A problem set, sometimes shortened as pset, [1] is a teaching tool used by many universities. Most courses in physics, math, engineering, chemistry, and computer science will give problem sets on a regular basis. [2] They can also appear in other subjects, such as economics.

  6. Direct methods (crystallography) - Wikipedia

    en.wikipedia.org/wiki/Direct_methods...

    In crystallography, direct methods are a family of methods for estimating the phases of the Fourier transform of the scattering density from the corresponding magnitudes. . The methods generally exploit constraints or statistical correlations between the phases of different Fourier components that result from the fact that the scattering density must be a positive real nu

  7. NYT ‘Connections’ Hints and Answers Today, Sunday ... - AOL

    www.aol.com/nyt-connections-hints-answers-today...

    Get ready for all of today's NYT 'Connections’ hints and answers for #588 on Sunday, January 19, 2025. Today's NYT Connections puzzle for Sunday, January 19, 2025The New York Times.

  8. 10 Things You Should Never Pay For - AOL

    www.aol.com/10-things-never-pay-140000055.html

    6. Bottled Water. While it might seem like a stretch to call the entire bottled water industry a scam … it kinda is. Most bottled water companies simply take municipal water and filter it for ...

  9. Graham's law - Wikipedia

    en.wikipedia.org/wiki/Graham's_law

    Thomas Graham. Graham's law of effusion (also called Graham's law of diffusion) was formulated by Scottish physical chemist Thomas Graham in 1848. [1] Graham found experimentally that the rate of effusion of a gas is inversely proportional to the square root of the molar mass of its particles. [1]

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