Search Results - "Valavanis, A"

Silver-based surface plasmon waveguide for terahertz quantum cascade lasers by Han, Y J, Li, L H, Zhu, J, Valavanis, A, Freeman, J R, Chen, L, Rosamond, M, Dean, P, Davies, A G, Linfield, E H

“…Terahertz-frequency quantum cascade lasers (THz QCLs) based on ridge waveguides incorporating silver waveguide layers have been investigated theoretically and…”
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Combining fMRI and DTI: A framework for exploring the limits of fMRI-guided DTI fiber tracking and for verifying DTI-based fiber tractography results by Staempfli, P., Reischauer, C., Jaermann, T., Valavanis, A., Kollias, S., Boesiger, P.

“…A powerful, non-invasive technique for estimating and visualizing white matter tracts in the human brain in vivo is white matter fiber tractography that uses…”
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Extended density-matrix model applied to silicon-based terahertz quantum cascade lasers by Dinh, T. V., Valavanis, A., Lever, L. J. M., Ikonić, Z., Kelsall, R. W.

“…Silicon-based terahertz quantum cascade lasers (QCLs) offer potential advantages over existing III-V devices. Although coherent electron transport effects are…”
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Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations by Agnew, G., Grier, A., Taimre, T., Lim, Y. L., Nikolić, M., Valavanis, A., Cooper, J., Dean, P., Khanna, S. P., Lachab, M., Linfield, E. H., Davies, A. G., Harrison, P., Ikonić, Z., Indjin, D., Rakić, A. D.

“…Terahertz-frequency quantum cascade lasers (THz QCLs) based on bound-to-continuum active regions are difficult to model owing to their large number of quantum…”
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The impact of athrosclerosis on cognition and disability in multiple sclerosis patients: the ATHUS score by Valavanis, A V, Tsitsipa, E, Intzes, S, Psoma, E, Tegos, T

“…Atherosclerosis of the large arteries of the neck could be related to the cognitive and motor deficit. We investigated if the atherosclerosis of common carotid…”
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Extraction-controlled terahertz frequency quantum cascade lasers with a diagonal LO-phonon extraction and injection stage by Han, Y J, Li, L H, Grier, A, Chen, L, Valavanis, A, Zhu, J, Freeman, J R, Isac, N, Colombelli, R, Dean, P, Davies, A G, Linfield, E H

“…We report an extraction-controlled terahertz (THz)-frequency quantum cascade laser design in which a diagonal LO-phonon scattering process is used to achieve…”
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The value of contralateral stenosis as a measure of carotid plaque instability on ultrasound by Tegos, T, Orologas, A, Notas, K, Petrakis, A, Valavanis, A, Xeras, C.H, Papadimitriou, A

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SENSE-DTI at 3 T by Jaermann, T., Crelier, G., Pruessmann, K.P., Golay, X., Netsch, T., van Muiswinkel, A.M.C, Mori, S., van Zijl, P.C.M., Valavanis, A., Kollias, S., Boesiger, P.

“…While holding vast potential, diffusion tensor imaging (DTI) with single‐excitation protocols still faces serious challenges. Limited spatial resolution,…”
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Neuroradiology: The Essentials with MR and CT by Runge, Val M, Smoker, Wendy R. K. Smoker, Valavanis, Anton

“…A practical text on the essentials of neuroradiology Neuroradiology is a core clinical resource that clearly illustrates and describes MR and CT images of the…”
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Environment of Aneurysms and Endovascular Considerations by Valavanis, A.

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Influence of SENSE on image properties in high-resolution single-shot echo-planar DTI by Jaermann, T., Pruessmann, K.P., Valavanis, A., Kollias, S., Boesiger, P.

“…Limited spatial resolution is a key obstacle to the study of brain white matter structure with diffusion tensor imaging (DTI). In its frequent implementation…”
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Resolving fiber crossing using advanced fast marching tractography based on diffusion tensor imaging by Staempfli, P., Jaermann, T., Crelier, G.R., Kollias, S., Valavanis, A., Boesiger, P.

“…Magnetic resonance diffusion tensor tractography is a powerful tool for the non-invasive depiction of the white matter architecture in the human brain…”
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Stable perfectly-matched-layer boundary conditions for finite-difference time-domain simulation of acoustic waves in piezoelectric crystals by Cooper, J.D., Valavanis, A., Ikonić, Z., Harrison, P., Cunningham, J.E.

“…Perfectly-matched-layer (PML) boundary conditions are derived for finite-difference time-domain analysis of acoustic waves within piezoelectric crystals. The…”
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Simulated [111] Si-SiGe terahertz quantum cascade laser by Lever, L., Valavanis, A., Ikonić, Z., Kelsall, R. W.

“…The prospect of developing a silicon laser has long been an elusive goal, mainly due to the indirect band gap and large effective carrier masses. We present a…”
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The Development of a Semtex-H Simulant for Terahertz Spectroscopy by Greenall, N., Valavanis, A., Desai, H. J., Acheampong, D. O., Li, L. H., Cunningham, J. E., Davies, A. G., Linfield, E. H., Burnett, A. D.

“…The development and use of terahertz (THz) frequency spectroscopy systems for security screening has shown an increased growth over the past 15 years. In order…”
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The importance of electron temperature in silicon-based terahertz quantum cascade lasers by Lever, L., Valavanis, A., Evans, C. A., Ikonić, Z., Kelsall, R. W.

“…Quantum cascade lasers (QCLs) are compact sources of coherent terahertz radiation. Although all existing QCLs use III-V compound semiconductors, silicon-based…”
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Fatal Cerebral Venous Air Embolism During Endoscopic Retrograde Cholangiopancreatography—Case Report and Review of the Literature by Nern, C., Bellut, D., Husain, N., Pangalu, A., Schwarz, U., Valavanis, A.

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A Case of Transient Ischemic Attack in a patient with Ulcerative Colitis by Valavanis, A, Tegos, T

“…Arterial stroke is a rare complication of Ulcerative Colitis (UC) and so far there are no guidelines for the treatment of stroke in these patients. The…”
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The Pharyngo-Tympano-Stapedial Variant of the Middle Meningeal Artery: A Case Report by Baltsavias, G., Kumar, R., Valavanis, A.

“…Atypical origin of the middle meningeal artery from the cervical internal carotid artery is a rare angiographic finding. We describe a case of the…”
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Endovascular Occlusion of a Lacerated Primitive Trigeminal Artery during Surgical Resection of Clival Chordoma: A Case Report by Baltsavias, G., Valavanis, A.

“…We describe a case of a persistent primitive trigeminal artery (PPTA) coexistent with a clival chordoma. During surgery of the tumor, the partially…”
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