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Resonance phenomena in dielectric media: A review and comparison of acoustic and electromagnetic modes

Journal of Advanced Dielectrics 2023年第4期13卷 35-40页

作者： Gunnar Gidion taimur aftab Leonhard M.Reindl Stefan J.Rupitsch Department of Microsystems Engineering University of Freiburg Georges-Köhler-Allee 10679110 Freiburg im BreisgauGermany

The theory and application of resonances and vibrational modes are part of the foundation of *** this contribution,examples of acoustical resonators are highlighted,and compared to electromagnetic *** an example from architecture,we describe the phenomenon of whispering galleries;such modes are nowadays known in dielectric and optical resonators.A specimen of a semicircular whispering bench in Park Sanssouci in Potsdam is acoustically investigated and demonstrated to show low losses for sound propagation.A special acoustical bug is discussed which was used for the espionage of the *** in *** Sovyets could interrogate this passive device by radio *** working principle was based on the electromagnetic resonance of the cavity that the sound-sensitive membrane was part *** underlying relation between excitation and resonance is compared to the sound production in flue organ pipes.A stopped flue organ pipe was investigated using a piezoelectric film sensor inside the pipe *** results show that even-numbered modes,which are usually suppressed in the radiated sound of a stopped pipe,are still present in the vibrations inside the resonator.

关键词： Whispering gallery dielectric resonator passive wireless microphone flue organ pipe ferroelectret sensor

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Atypical focal nodular hyperplasia of the liver

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Hepatobiliary & Pancreatic Diseases International 2011年第1期10卷 104-106页

作者： Muhammad Rizwan Khan taimur Saleem Tanveer Ul Haq Kanwal aftab Section of General Surgery Department of Surgery Aga Khan UniversityStadium Road Department of Pathology Aga Khan UniversityStadium Road Section of Interventional Radiology Department of RadiologyAga Khan UniversityStadium Road Aga Khan University Hospital Medical College Aga Khan UniversityStadium Road

BACKGROUND:Focal nodular hyperplasia,a benign hepatic tumor,is usually ***,rarely the entity can cause symptoms,mandating intervention. METHOD:We present a case of focal nodular hyperplasia of the liver,which caused a considerable diagnostic dilemma due to its atypical presentation. RESULTS:A 29-year-old woman presented with a 15-year history of a progressively increasing mass in the right upper quadrant which was associated with pain and emesis. Examination showed a firm,mobile mass palpable below the right subcostal margin.A computed tomography scan of the abdomen showed an exophytic mass arising from hepatic segments III and *** biopsy of the hepatic mass was *** showed a vascular tumor that was supplied by a tortuous branch of the proper hepatic artery. Surgical intervention for removal of the mass was undertaken. Intra-operatively,two large discrete tumors were found and completely *** examination showed features consistent with focal nodular hyperplasia. CONCLUSION:This description of an unusual case of focal nodular hyperplasia of the liver highlights the point that the diagnosis of otherwise benign hepatic tumors may be difficult despite extensive work-up in some cases.

关键词： focal nodular hyperplasia atypical liver

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