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XDrawChem is a free software program for drawing chemical structural formulas, available for Unix and macOS. It is distributed under the GNU GPL . In Microsoft Windows this program is called WinDrawChem.
ChemWindow is a chemical structure drawing molecule editor and publishing program now published by John Wiley & Sons as of 2020, [1] originally developed by Bio-Rad Laboratories, Inc. [2] [3] It was first developed by SoftShell International in the 1990s. [4]
Because actual rather than absolute values of the forecast errors are used in the formula, positive and negative forecast errors can offset each other; as a result, the formula can be used as a measure of the bias in the forecasts. A disadvantage of this measure is that it is undefined whenever a single actual value is zero.
Any non-linear differentiable function, (,), of two variables, and , can be expanded as + +. If we take the variance on both sides and use the formula [11] for the variance of a linear combination of variables (+) = + + (,), then we obtain | | + | | +, where is the standard deviation of the function , is the standard deviation of , is the standard deviation of and = is the ...
This is a list of common chemical compounds with chemical formulae and CAS numbers, indexed by formula. This complements alternative listing at list of inorganic compounds. There is no complete list of chemical compounds since by nature the list would be infinite.
Molecule builder-editor for Windows, Linux, Unix, and macOS. All source code is licensed under the GNU General Public License (GPL) version 2. Supported languages include: Chinese , English , French , German , Italian , Russian , Spanish , and Polish .
2018/4/24 Origin 2018b. Matrices embedded in workbook, Worksheet/matrix data preview, Dynamic graph preview in analysis, Distributed batch processing on multi-core CPU (app). 2017/11/9 Origin 2018. Cell formula, Unicode, Bridge chart, changed to a more compact file format (OPJU). 2016/11/10 Origin 2017.
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.