?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F351%2F&rft.title=Formation+Response+of+High+Frequency+Electromagnetic+Waves&rft.creator=Hadj-Sassi%2C+K.&rft.creator=Clawson%2C+R.&rft.subject=Energy+and+utilities&rft.subject=Materials&rft.description=Core+samples+from+rock+formations+respond+to+electromagnetic+radiation+based+on+an+effective+permittivity%2C+which+depends+on+the+conductivity+and+permittivity+of+the+constituent+components+of+the+rock%2C+as+well+as+the+geometric+structure+of+these+constituents+and+the+frequency+of+the+radiation.+This+study+analyzes+the+effect%2C+for+radiation+of+1+to+100+Mhz%2C+of+discrete+inclusions+having+a+different+permittivity+from+the+surrounding+medium.+The+focus+is+on+the+effect+of+certain+geometric+features%2C+namely%2C+the+individual+size+of+the+inclusions%2C+their+overall+volume+fraction%2C+the+presence+of+sharp+edges%2C+and+their+aspect+ratio.+%0D%0A%0D%0AIt+is+found+that+the+volume+fraction+has+the+strongest+impact+on+the+effective+permittivity%2C+linear+at+first+but+higher+order+at+higher+volume+fractions.+The+aspect+ratio+of+the+inclusions+has+a+moderate+effect%2C+which+is+exaggerated+in+the+extreme+case+of+needle-like+inclusions%2C+and+which+can+also+be+seen+in+a+stronger+nonlinearity.+There+is+also+a+possibility+that+some+features+in+the+shape+of+the+inclusion+boundaries+may+influence+the+frequency+dependence+of+the+effective+permittivity.+Inclusion+size+and+sharp+edges+have+negligible+effect.&rft.date=2011&rft.type=Study+Group+Report&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F351%2F1%2FSLB-waves.pdf&rft.identifier=++Hadj-Sassi%2C+K.+and+Clawson%2C+R.++(2011)+Formation+Response+of+High+Frequency+Electromagnetic+Waves.++%5BStudy+Group+Report%5D+++++