Thanks for this advice. I removed the abstract environment and
obtained what I wanted with the following:
\documentclass[12pt,a4paper,twoside]{article}
\usepackage[format=hang]{caption}
\usepackage[top=1.5cm,right=1.2cm,bottom=1.5cm,left=1.5cm]{geometry}
\usepackage[T1]{fontenc}
\usepackage[latin1,utf8]{inputenc}
\usepackage{graphicx}
\begin{document}
\preauthor{\begin{flushleft}}
\author{author 1*, author 2\\
\textit{address 1\\
address 2\\~\\}
\footnotesize*corresponding author: telephone, e-mail\\~\\
Key words: Lorem ipsum dolor sit amet, consectetur adipisicing elit,
sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
}
\postauthor{\end{flushleft}}
\predate{\begin{flushleft}}
\date{~}
\postdate{\end{flushleft}}
\pretitle{\begin{flushleft}\Large}
\title{Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed
do eiusmod tempor incididunt ut labore et dolore magna aliqua.}
\posttitle{\end{flushleft}}
\maketitle
\vspace{1 cm}
\noindent Lorem ipsum dolor sit amet, consectetur adipisicing elit,
sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut
enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
ut aliquip ex ea commodo consequat. Duis aute irure dolor in
reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
pariatur. Excepteur sint occaecat cupidatat non proident, sunt in
culpa qui officia deserunt mollit anim id est laborum.
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad
minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat. Duis aute irure dolor in
reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
pariatur. Excepteur sint occaecat cupidatat non proident, sunt in
culpa qui officia deserunt mollit anim id est laborum.
\begin{figure}
\label{}
\begin{center}
\end{center}
\caption{Excepteur sint occaecat cupidatat non proident, sunt in
culpa qui officia deserunt mollit anim id est laborum.}
\end{figure}
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad
minim veniam, quis nostrud exercitation ullamco laboris nisi ut
aliquip ex ea commodo consequat. Duis aute irure dolor in
reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
pariatur. Excepteur sint occaecat cupidatat non proident, sunt in
culpa qui officia deserunt mollit anim id est laborum.
\end{document}
The final adjustments I would like to make are to change the space
between the title and the top edge of the page (should be 15 mm as set
in the geometry package but the dvi view shows a top margin much
larger. Also the space between the key-word paragraph and the main
body text seems large; vspace did change the appearance.