107 research outputs found
Face of the giant panda sign in Wilson disease
No full textWilson disease usually presents with neurologic or hepatic manifestations. Magnetic resonance imaging (MRI) of the brain is very informative in diagnosiing of this disease, especially in patients with neurological features. High T2 signal intensity in the corpus striatum is the most commonly encountered MRI finding. The 'face of the giant panda' sign is seen on axial T2-weighted MRI, and results from abnormal signal intensities in the midbrain. Though uncommon, the sign is considered as the pathognomonic MRI sign of Wilson disease
Population balance equation for collisional breakage: A new numerical solution scheme and its convergence
No full text<p><strong>Synopsis</strong></p><p>These files represent a reference implementation of the finite volume method for the solution of the discretised population balance equation for collisional breakge. Several test cases are provided. </p><p>Implementation language: Matlab (FORTRAN-derivative)</p><p>The method and its capabilities are described in<br>P. Kuswah, A. Das, J. Saha, A. Bück, "Population balance equation for collisional breakage: A new numerical solution scheme and its convergence", Communications in Nonlinear Science and Numerical Simulation, vol 121, 107244, 2023. </p><p>If the method or code is used in other work, cite<br>P. Kuswah, A. Das, J. Saha, A. Bück, "Population balance equation for collisional breakage: A new numerical solution scheme and its convergence", Communications in Nonlinear Science and Numerical Simulation, vol 121, 107244, 2023. </p><p><strong>License</strong></p><p>The implementation is distributed as-is without taking over any responsibility by the authors or their affiliated institutions for potential damages resulting from its use. </p><p>The implementation is made available under Creative Commons Attribution Non Commercial No Derivatives 4.0 International. </p><p><strong>Folder contents</strong></p><p>The reference implementations are provided for the cases discussed in the mentioned publication. The implementation of the finite volume methode is stored in the sub-folders "DPBE_Brk", calling sequence and required initialisiations are given in the files "Main_FPT.m".</p><p>In case of problems, bug reports, feel free to contact any author.</p><p>On behalf of all authors,</p><p>Andreas Bück<br>Institute of Particle Technology<br>Friedrich-Alexander-Universität Erlangen-Germany<br>[email protected]<br>www.spg.forschung.fau.de</p><p> </p><p>v1.0: 31.08.2023</p>
Data mining – project II
No full textThe purpose of this report is to document what the author had done in the project to investigate
problems in data mining and designing novel algorithms to solve it and compare against existing
approaches. The objective of the project is to determine whether the current approaches to
datamining are optimal and come up with possibly better methods to go about it. The project
requires the author to data mine from a given set of data, analyze the results and attempt to
improve upon existing methodologies.Bachelor of Engineering (Computer Engineering
Effects due to unconventional pairing in transport through a normal metal-superconductor-normal metal hybrid junction
No full textQuantum transport through a helical ring in presence of Aharonov-Bohm flux and Rashba spin-orbit interaction
No full textEffect of concentration variation in graphene oxide (GO) membranes for water flux optimization
No full textIn situ power-loss estimation of IGBT modules
No full textA fault detection and prediction method for insulated-gate bipolar transistors (IGBTs) has been improved over the past decades to reduce system downtime. In situ lifetime estimation of IGBT modules has been challenging due to a number of requirements: the necessity to operate at high voltage in the switching environment and the measurement precision of the gate-threshold voltage or collector-to-emitter voltage. This thesis presents a wear-fatigue estimation framework that consists of collector-to-emitter measurement, power loss calculation, and thermal lifetime prediction model. The measurement circuit enables the estimation of power loss across a variety of IGBT modules with minimum impact on system reliability.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2023-05-01The student, Qichen Jin, accepted the attached license on 2021-04-29 at 10:53.The student, Qichen Jin, submitted this Thesis for approval on 2021-04-29 at 10:58.This Thesis was approved for publication on 2021-04-29 at 15:19.DSpace SAF Submission Ingestion Package generated from Vireo submission #16596 on 2021-09-16 at 20:14:39Made available in DSpace on 2021-09-17T04:06:56Z (GMT). No. of bitstreams: 2
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Previous issue date: 2021-04-29Embargo set by: Seth Robbins for item 118716
Lift date: 2023-09-17T04:07:01Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemAuthor requested closed access (OA after 2yrs) in Vireo ETD systemLimite
Condition monitoring of SiC MOSFETs on LLC resonant converter
No full textSilicon carbide (SiC) MOSFETs are widely acknowledged for low loss, fast switching and remarkable thermal conductivity compared to silicon (Si) counterparts. SiC-based power electronic converters, therefore, are optimal when operated at medium voltage to high voltage in high switching frequency applications, which results in a much higher power density than Si-based power converters. The reliability of SiC devices, however, remains a significant hindrance to their wide adoption in power electronics in transportation, industry and military applications. Real-time condition monitoring of SiC devices in SiC-based power converters addresses the reliability issues by providing an early sign of potential failure. Since one of the most consistent failure precursors of a degraded SiC MOSFET is an increase of gate leakage current, a circuitry is developed to track and estimate the on-state gate leakage current of the device during operation. To demonstrate the functionality of the proposed method, an LLC full-bridge resonant converter that operates at a medium voltage and high switching frequency was designed and used to obtain the experimental results. This converter will operate at various duty ratios, DC-link voltages, switching frequencies and output loads to show the consistency and accuracy of the proposed condition monitoring method. With proper calibration, this cost-effective method obtains an accurate gate leakage estimation which opens opportunities to perform prognostic and health monitoring of SiC devices.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-05-01The student, Patrick Wang, accepted the attached license on 2021-04-23 at 02:17.The student, Patrick Wang, submitted this Thesis for approval on 2021-04-23 at 02:49.This Thesis was approved for publication on 2021-04-26 at 14:56.DSpace SAF Submission Ingestion Package generated from Vireo submission #16521 on 2021-09-16 at 17:05:03Made available in DSpace on 2021-09-17T02:34:46Z (GMT). No. of bitstreams: 2
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Previous issue date: 2021-04-26Embargo set by: Seth Robbins for item 118577
Lift date: 2023-09-17T02:34:57Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemAuthor requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Onl
Exploring cosmological implications of the modified Raychaudhuri equation in non-gravitating vacuum energy theory
No full textThis article investigates the modified Raychaudhuri Equation (RE) in the context of Non-Gravitating Vacuum Energy (NGVE) theory and its implications for various cosmological characteristics. The equation is formulated based on the NGVE framework, in which global scale invariance generates a unique geometry. The newly developed geometry introduces a metric that is conformally connected to the conventional metric, with the conformal factor dependent on scalar field potentials. The cosmological study is carried out under the framework of a flat Friedmann–Lemaître–Robertson–Walker (FLRW) universe. Assuming matter behaves as an ideal fluid in the modified geometry, we formulate models for conditional expansion, collapse, and steady state, governed by the scalar field . In this context, the caustic solution and the focusing theorem are also studied. Scalar field solutions for exponential and power-law scale factors are also derived using NGVE theory’s equations of motion. Finally, graphical analysis is used to investigate the behavior of the interaction terms that appear in the modified RE under these scale factors
Form Invariance of Raychaudhuri equation in the presence of Inflaton-type fields
No full textWe show that the Raychaudhuri equation remains form invariant for certain solutions of scalar fields whose Lagrangian is non-canonical and of the form , with and the potential. Solutions exist for both homogeneous and inhomogeneous fields that are like inflatons. Certain recent observations indicate that the cosmos is inhomogeneous and thus our results are in sync with the latest observations. So the Raychaudhuri equation can accommodate primordial inhomogeneities as well as cosmologically relevant scenarios.6 page
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