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Asymptote is also notable for having a graphical interface coded in Python (and the Tk widget set), xasy.py – this allows an inexperienced user to quickly draw up objects and save them as .asy source code which can then be examined or edited by hand. The program's syntax was originally described by using a Yacc compatible grammar.
Learn how to measure and classify the polarity of chemical bonds using bond dipole moments, which are vectors representing the separation of positive and negative charges. Find examples of polar and nonpolar molecules and their properties.
A causal loop diagram (CLD) is a visual tool to show how variables in a system are causally related. A reinforcing loop is a cycle that amplifies variations in a variable, while a balancing loop is a cycle that corrects deviations from a goal.
Learn how to draw Lewis structures, also called Lewis dot formulas, to show the bonding and lone pairs of electrons in molecules and ions. Find methods, examples, exceptions, and a table for calculating bonds and lone pairs.
Arrow pushing or electron pushing is a technique used to describe the progression of organic chemistry reaction mechanisms. [1] It was first developed by Sir Robert Robinson . In using arrow pushing, "curved arrows" or "curly arrows" are drawn on the structural formulae of reactants in a chemical equation to show the reaction mechanism .
A coordinate covalent bond is a type of covalent bond in which the two electrons come from the same atom. It is common in coordination compounds and Lewis acid-base interactions. Learn about its formation, examples, and comparison with other electron-sharing modes.
In mathematics, a spherical coordinate system is a coordinate system for three-dimensional space where the position of a given point in space is specified by three real numbers: the radial distance r along the radial line connecting the point to the fixed point of origin; the polar angle θ between the radial line and a polar axis; and the ...
To draw a pole figure, one chooses a particular crystal direction (e.g. the normal to the (100) plane) and then plots that direction, called a pole, for every crystal relative to a set of directions in the material. In a rolled metal, for example, the directions in the material are the rolling direction, transverse direction and rolling plane ...