How to get bold serif upright?

Question

As explained here at bullet point 6

http://www.tandf.co.uk/journals/authors/style/Mathematical-Scripts.pdf

I need to produce

bold serif italic for vectors
bold serif upright for matrices

The answer here from Mico:

Bold, italic math (\bm) and sansmath

Shows how the package \bm can be used to get bold serif italic, which solves the first problem.

But how can I get a bold serif upright?

I tired using \mathbf but although the font produced it upright and bold it is roman rather than serif?

Note that I am working in the bespoke document class rQUF2e which can be found in section 2 style guidelines here:

http://www.tandfonline.com/action/authorSubmission?journalCode=rquf20&page=instructions#submission

\documentclass{rQUF2e}  
\usepackage{epstopdf}
\begin{document}

 $\bm{u}$ was produced using slash bm and, as desired, gives a bold (math italic) u, $\mathbf{u}}$ produced using slash mathbf produces a bold upright u but it's the roman font version of u.     

\end{document}

Baz

Answer 1

"Roman" is essentially another name for an upright serif font (or viewed another way "Roman" style is the most common style of upright fonts with serifs) so the style guide is asking you to use \mathbf that is, bold roman letters.