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Just like the 'bar' in the reduced Planck constant, in physics people need to use the same 'bar' across differential sign $d$ to indicate a imperfect differential in, say, a quasi-static process. How do I type it? For example, enter image description here

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  • With amsmath and \usepackage[T1]{fontenc}: $\text{\dj}$ (or $\text{\textit{\dj}}$ – probably a good idea to define a custom command…) – cgnieder Apr 18 '17 at 15:16
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Here's one way, with a stack... which overlays a nonmath - upon a math d. It currently does not work in smaller math styles.

\documentclass{book}
\usepackage{stackengine}
\newcommand\bard{\ensurestackMath{\stackengine{.7ex}{d}{\mbox{-}\mkern-1.6mu}{O}{r}{F}{T}{L}}}
\begin{document}
$\bard Q = dU + P\, dV$
\end{document}

enter image description here

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