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{\bf Abstract Registration Number 544} \\
{\bf Parallel sessions: 5,3} \\
{\bf Plenary sessions: 7,5}
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\abstractheader{\bf Measurement of Di-jet Cross-Sections
       in Low $Q^2$ Deep-Inelastic \\ Scattering Processes at HERA and the
       Extraction of an \\ Effective Parton Density of the Virtual Photon\\
H1 Collaboration, DESY}

\abstractbody{
 Differential di-jet cross sections
 are measured in deep-inelastic scattering processes 
 for photon virtuality $Q^2>1.6$\, GeV$^2$ with the H1 detector at HERA. 
 The results are compared  
 with leading and next-to-leading order QCD calculations which include
 the effects of a resolved component to the virtual photon. 
 The suppression of the parton density with increasing virtuality of 
 the photon is quantified using the ratio of di-jet production
 in resolved to direct photon-proton interactions.
 An effective leading order parton density for the virtual photon
 is extracted in different bins of the photon virtuality.
 The parton densities are compared with QCD inspired model predictions.
}

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