\documentclass[12pt]{beamer}
\usepackage{pgf,pgfnodes,pgfautomata,pgfheaps}

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%%\def\normalframenumbering{}

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\mode<presentation>
% \setbeamertemplate{background canvas}[vertical shading][bottom=red!10,
% top=blue!10]
\usetheme{Warsaw}
\usefonttheme[onlysmall]{structurebold}

\usepackage[utf8]{inputenc}
\usepackage{amsmath,amssymb}
\usepackage{colortbl}
\usepackage[english]{babel}
% Or whatever. Note that the encoding and the font should match. If T1
% does not look nice, try deleting the line with the fontenc.

\definecolor{ColClaim}{rgb}{0,0,0.8}
\definecolor{Alert}{rgb}{0.8,0,0}
\definecolor{Blank}{rgb}{1,1,1}
\def\claim#1{{\color{ColClaim}#1}}
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\let\framenumbering=\normalframenumbering

\title[\ \kern-190pt\rlap{\blank{J.-P.\ Demailly (Grenoble), Séminaire des Doctorants}}\kern181pt\rlap{\blank{Énergie nucléaire du futur}}\kern181pt\llap{\blank{\framenumbering~}}\kern-10pt]
% (optional, use only with long paper titles)
{Énergie nucléaire du futur, aspects\\
sociétaux, physiques et mathématiques}

%% \subtitle{Presentation Subtitle} % (optional)

\author[] % (optional, use only with lots of authors)
{Jean-Pierre Demailly}

\institute[]{Institut Fourier, Université de Grenoble I\ \ \&\ \ Académie des Sciences de Paris}
% - Use the \inst command only if there are several affiliations.
% - Keep it simple, no one is interested in your street address.

\date[]% (optional)
{18 novembre 2015\\
Séminaire des Doctorants\\
de l'Université d'Aix-Marseille}

%%\subject{Talks}
% This is only inserted into the PDF information catalog. Can be left
% out. 

% If you have a file called "university-logo-filename.xxx", where xxx
% is a graphic format that can be processed by latex or pdflatex,
% resp., then you can add a logo as follows:

%%\def\\{\hfil\break}
\ifpdf
\font\eightrm=ec-lmr10 at 8pt
\else
\font\eightrm=cmr10 at 8pt
\fi

\begin{document}

% Delete this, if you do not want the table of contents to pop up at
% the beginning of each subsection:
%%\AtBeginSubsection[]
%%{
%% \begin{frame}<beamer>
%%    \frametitle{Outline}
%%    \tableofcontents[currentsection,currentsubsection]
%%  \end{frame}
%%}


% If you wish to uncover everything in a step-wise fashion, uncomment
% the following command: 

%\beamerdefaultoverlayspecification{<+->}

\begin{frame}
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  \pgfuseimage{ujf-logo}
  \pgfdeclareimage[height=2cm]{acad-logo}{academie_logo2.pdf}
  \pgfuseimage{acad-logo}
  \vskip-12pt
  \titlepage
\end{frame}

\end{document}