Three-Dimensional Channel Potential Model of a Triple Gate MOSFET based on Conformal Mapping Technique

2021 ◽  
pp. 1-9
Author(s):  
Ria Bose ◽  
J. N. Roy
Keyword(s):  
Conformal Mapping ◽  
Potential Model ◽  
Three Dimensional ◽  
Mapping Technique ◽  
Channel Potential

Epitaxial Ni nanoparticles on CaF2(001), (110) and (111) surfaces studied by three-dimensional RHEED, GIXD and GISAXS reciprocal-space mapping techniques

2017 ◽  
Vol 50 (3) ◽  
pp. 830-839 ◽  
Author(s):  
S. M. Suturin ◽  
V. V. Fedorov ◽  
A. M. Korovin ◽  
N. S. Sokolov ◽  
A. V. Nashchekin ◽  
...  
Keyword(s):  
Lattice Structure ◽  
Three Dimensional ◽  
Grazing Incidence ◽  
High Energy ◽  
Reciprocal Space ◽  
Mapping Technique ◽  
Face Centered Cubic ◽  
X Ray ◽  
Cubic Lattice ◽  
Face Centered

The development of growth techniques aimed at the fabrication of nanoscale heterostructures with layers of ferroic 3dmetals on semiconductor substrates is very important for their potential usage in magnetic media recording applications. A structural study is presented of single-crystal nickel island ensembles grown epitaxially on top of CaF2/Si insulator-on-semiconductor heteroepitaxial substrates with (111), (110) and (001) fluorite surface orientations. The CaF2buffer layer in the studied multilayer system prevents the formation of nickel silicide, guides the nucleation of nickel islands and serves as an insulating layer in a potential tunneling spin injection device. The present study, employing both direct-space and reciprocal-space techniques, is a continuation of earlier research on ferromagnetic 3dtransition metals grown epitaxially on non-magnetic and magnetically ordered fluorides. It is demonstrated that arrays of stand-alone faceted nickel islands with a face-centered cubic lattice can be grown controllably on CaF2surfaces of (111), (110) and (001) orientations. The proposed two-stage nickel growth technique employs deposition of a thin seeding layer at low temperature followed by formation of the islands at high temperature. The application of an advanced three-dimensional mapping technique exploiting reflection high-energy electron diffraction (RHEED) has proved that the nickel islands tend to inherit the lattice orientation of the underlying fluorite layer, though they exhibit a certain amount of {111} twinning. As shown by scanning electron microscopy, grazing-incidence X-ray diffraction (GIXD) and grazing-incidence small-angle X-ray scattering (GISAXS), the islands are of similar shape, being faceted with {111} and {100} planes. The results obtained are compared with those from earlier studies of Co/CaF2epitaxial nanoparticles, with special attention paid to the peculiarities related to the differences in lattice structure of the deposited metals: the dual-phase hexagonal close-packed/face-centered cubic lattice structure of cobalt as opposed to the single-phase face-centered cubic lattice structure of nickel.

Impulse Response of Metal-Semiconductor-Metal Photodetectors Using a Conformal Mapping Technique and Extracted Circuit Parameters

1997 ◽  
Vol 36 (Part 1, No. 2) ◽  
pp. 652-656 ◽  
Author(s):  
Walter Wohlmuth ◽  
Mohamed Arafa ◽  
Patrick Fay ◽  
Jong-Wook Seo ◽  
Ilesanmi Adesida
Keyword(s):  
Conformal Mapping ◽  
Impulse Response ◽  
Mapping Technique ◽  
Metal Semiconductor Metal

Evaluation of left ventricular volumes and ejection fraction with a nonfluoroscopic endoventricular three-dimensional mapping technique

2000 ◽  
Vol 140 (4) ◽  
pp. 596-602 ◽  
Author(s):  
Glenn Van Langenhove ◽  
Jaap N. Hamburger ◽  
Peter C. Smits ◽  
Mariano Albertal ◽  
Emile Onderwater ◽  
...  
Keyword(s):  
Ejection Fraction ◽  
Three Dimensional ◽  
Left Ventricular ◽  
Mapping Technique ◽  
Left Ventricular Volumes ◽  
Ventricular Volumes ◽  
Three Dimensional Mapping ◽  
Dimensional Mapping

Virtual electrode theory explains pacing threshold increase caused by cardiac tissue damage

2004 ◽  
Vol 286 (6) ◽  
pp. H2183-H2194 ◽  
Author(s):  
Aleksandre T. Sambelashvili ◽  
Vladimir P. Nikolski ◽  
Igor R. Efimov
Keyword(s):  
Tissue Damage ◽  
Cardiac Tissue ◽  
Three Dimensional ◽  
Rabbit Heart ◽  
Mapping Technique ◽  
Electrode Polarization ◽  
Pacing Threshold ◽  
Antibody Staining ◽  
Threshold Increase ◽  
Virtual Electrode

The virtual electrode polarization (VEP) effect is believed to play a key role in electrical stimulation of heart muscle. However, under certain conditions, including clinically, its existence and importance remain unknown. We investigated the influence of acute tissue damage produced by continuous pacing with strong current (40-mA, 4-ms biphasic pulses with 4-Hz frequency for 5 min) on stimulus-generated VEPs and pacing thresholds. A fluorescent optical mapping technique was used to obtain stimulus-induced transmembrane potential distribution around a pacing electrode applied to the ventricular surface of a Langendorff-perfused rabbit heart ( n = 5). Maps and pacing thresholds were recorded before and after tissue damage. Spatial extents of electroporation and cell uncoupling were assessed by propidium iodide ( n = 2) and connexin43 ( n = 3) antibody staining, respectively. On the basis of these data, passive and active three-dimensional bidomain models were built to determine VEP patterns and thresholds for different-sized areas of the damaged region. Electrophysiological results showed that acute tissue damage led to disappearance of the VEP with an associated significant increase in pacing thresholds. Damage was expressed in electroporation and cell uncoupling within a ∼1.0-mm-diameter area around the tip of the electrode. According to computer simulations, cell uncoupling, rather than electroporation, might be the direct cause of VEP elimination and threshold increase, which was nonlinearly dependent on the size of the damaged region. Fiber rotation with depth did not substantially affect the numerical results. The study explains failure to stimulate damaged tissue within the concepts of the VEP theory.

An analytical model for coplanar waveguide on silicon-on-insulator substrate with conformal mapping technique

2011 ◽  
Vol 20 (1) ◽  
pp. 010210 ◽  
Author(s):  
Da-Wei He ◽  
Xin-Hong Cheng ◽  
Zhong-Jian Wang ◽  
Da-Wei Xu ◽  
Zhao-Rui Song ◽  
...  
Keyword(s):  
Conformal Mapping ◽  
Analytical Model ◽  
Coplanar Waveguide ◽  
Silicon On Insulator ◽  
Mapping Technique ◽  
Insulator Substrate

Three-dimensional endocardial impedance mapping: a new approach for myocardial infarction assessment

2001 ◽  
Vol 280 (1) ◽  
pp. H179-H188 ◽  
Author(s):  
Tamir Wolf ◽  
Lior Gepstein ◽  
Gal Hayam ◽  
Asaph Zaretzky ◽  
Rona Shofty ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Three Dimensional ◽  
Interventional Cardiology ◽  
Mapping Technique ◽  
Control Group ◽  
Myocardial Tissue ◽  
Coronary Artery Ligation ◽  
Accurate Identification ◽  
Artery Ligation ◽  
Electromechanical Mapping

Precise identification of infarcted myocardial tissue is of importance in diagnostic and interventional cardiology. A three-dimensional, catheter-based endocardial electromechanical mapping technique was used to assess the ability of local endocardial impedance in delineating the exact location, size, and border of canine myocardial infarction. Electromechanical mapping of the left ventricle was performed in a control group ( n = 10) and 4 wk after left anterior descending coronary artery ligation ( n = 10). Impedance, bipolar electrogram amplitude, and endocardial local shortening (LS) were quantified. The infarcted area was compared with the corresponding regions in controls, revealing a significant reduction in impedance values [infarcted vs. controls: 168.8 ± 11.7 and 240.7 ± 22.3 Ω, respectively (means ± SE), P < 0.05] bipolar electrogram amplitude (1.8 ± 0.2 mV, 4.4 ± 0.7 mV, P < 0.05), and LS (−2.36 ± 1.6%, 11.9 ± 0.9%, P < 0.05). The accuracy of the impedance maps in delineating the location and extent of the infarcted region was demonstrated by the high correlation with the infarct area (Pearson's correlation coefficient = 0.942) and the accurate identification of the infarct borders in pathology. By accurately defining myocardial infarction and its borders, endocardial impedance mapping may become a clinically useful tool in differentiating healthy from necrotic myocardial tissue.

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