Image Reconstruction and Resolution via Electrical Impedance Tomography

Electrical Impedance Tomography (EIT) is the cheapest imaging method known but with a questionable ability to produce reliable image. Improving the resolution and the quality of the reconstructed image will be the ultimate aim of this project. Image of better quality is achievable with the incremental number of electrodes used. A better image quality is possible with the utilization of a finer-meshed Finite Element Model (FEM) in solving forward problem of the algorithm involves. Further improvement on the images is attainable with the application of image post-processing of Matlab, in which an image of better contrast and noise-free is reconstructed. We are now one step closer in establishing EIT as a reliable imaging technique in the future

Fermion Condensate and Vacuum Current Density Induced by Homogeneous and Inhomogeneous Magnetic Fields in (2+1)-Dimensions

We calculate the condensate and the vacuum current density induced by external static magnetic fields in (2+1)-dimensions. At the perturbative level, we consider an exponentially decaying magnetic field along one cartesian coordinate. Non-perturbatively, we obtain the fermion propagator in the presence of a uniform magnetic field by solving the Schwinger-Dyson equation in the rainbow-ladder approximation. In the large flux limit, we observe that both these quantities, either perturbative (inhomogeneous) and non-perturbative (homogeneous), are proportional to the external field, in agreement with early expectations.Comment: 8 pages, 2 figures. Accepted for publication in Phys. Rev.

Image Reconstruction and Resolution via Electrical Impedance Tomography

Electrical Impedance Tomography (EIT) is the cheapest imaging method known but with a questionable ability to produce reliable image. Improving the resolution and the quality of the reconstructed image will be the ultimate aim of this project. Image of better quality is achievable with the incremental number of electrodes used. A better image quality is possible with the utilization of a finer-meshed Finite Element Model (FEM) in solving forward problem of the algorithm involves. Further improvement on the images is attainable with the application of image post-processing of Matlab, in which an image of better contrast and noise-free is reconstructed. We are now one step closer in establishing EIT as a reliable imaging technique in the future

Image Reconstruction and Resolution via Electrical Impedance Tomography

Electrical Impedance Tomography (EIT) is the cheapest imaging method known but with a questionable ability to produce reliable image. Improving the resolution and the quality of the reconstructed image will be the ultimate aim of this project. Image of better quality is achievable with the incremental number of electrodes used. A better image quality is possible with the utilization of a finer-meshed Finite Element Model (FEM) in solving forward problem of the algorithm involves. Further improvement on the images is attainable with the application of image post-processing of Matlab, in which an image of better contrast and noise-free is reconstructed. We are now one step closer in establishing EIT as a reliable imaging technique in the future

Chiral and Parity Symmetry Breaking for Planar Fermions: Effects of a Heat Bath and Uniform External Magnetic Field

We study chiral symmetry breaking for relativistic fermions, described by a parity violating Lagrangian in 2+1-dimensions, in the presence of a heat bath and a uniform external magnetic field. Working within their four-component formalism allows for the inclusion of both parity-even and -odd mass terms. Therefore, we can define two types of fermion anti-fermion condensates. For a given value of the magnetic field, there exist two different critical temperatures which would render one of these condensates identically zero, while the other would survive. Our analysis is completely general: it requires no particular simplifying hierarchy among the energy scales involved, namely, bare masses, field strength and temperature. However, we do reproduce some earlier results, obtained or anticipated in literature, corresponding to special kinematical regimes for the parity conserving case. Relating the chiral condensate to the one-loop effective Lagrangian, we also obtain the magnetization and the pair production rate for different fermion species in a uniform electric field through the replacement $B\to-iE$.Comment: 9 pages, 10 figure

Free Form of the Foldy-Wouthuysen Transformation in External Electromagnetic Fields

We derive the exact Foldy-Wouthuysen transformation for Dirac fermions in a time independent external electromagnetic field in the basis of the Ritus eigenfunctions, namely the eigenfunctions of the operator $(\gamma \cdot \Pi)^2$, with $\Pi^\mu = p^\mu - e A^\mu$. In this basis, the transformation acquires a free form involving the dynamical quantum numbers induced by the field.Comment: 8 pages. Accepted in J. Phys. A: Math. and Theo. (Fast Track Communication

Oral health of cystic fibrosis patients at a north american center : a pilot study

The objective of this study was to describe the oral health status of Cystic Fibrosis (CF) children in a US facility. Twenty CF children ages 6-18 were recruited from Children?s Hospital of Wisconsin Pulmonary Clinic. Parents completed a health questionnaire. Clinical examinations checked dental caries using the dmft/DMFT index, dental hygiene using the Simplified Greene-Vermillion Index (DI-S), gingival inflammation using the Community Periodontal Index of Treatment Needs, and enamel defects using the modified Developmental Defects of Enamel Index. The majority (90%) brush twice a day, 65% consume sugary snacks, and 70% visit the dentist every 6 months. Clinically, they presented DMFT 0.25 and dmft 0.90, fair oral hygiene with DI-S 1.02, 75% had mild gingivitis and 50% had enamel defects. The more antibiotics they took, significantly more frequent (p=0.007) and more severe (p=0.017) enamel defects were noted. Similar trend was found between the number of surgeries and the presence of enamel defects (p=0.076) and dental caries (p=0.028). Within the limitations of this study, CF patients were found to be at oral health risk due to the high prevalence of dental enamel defects. Oral health for CF children should be part of the multidisciplinary care

Did COVID-19 risk perceptions influence the handwashing behavior of the Filipino population?

The COVID-19 pandemic reminded people of the importance of proper handwashing. The degree of health risk perceptions and handwashing behavior during the COVID-19 pandemic opens essential lessons for delivering water, sanitation, and hygiene (WASH) programs across the globe. We measured the relationship between COVID-19 risk perception and the handwashing behavior of 386 Filipinos in a highly urbanized city in the Philippines. Self-made COVID-19 risk perception scale (CRPS) (Cronbach's α 0.93) and handwashing behavior scale (HBS) (Cronbach's α 0.84) were administered face-to-face. The results show that the overall handwashing behavior has a median of 4.1 (frequently), while the interquartile range (IQR) is 0.5. Regression analysis revealed that COVID-19 risk perception has a significant positive association with overall handwashing behavior (B=0.369, p-value <0.05). The COVID-19 risk perception accounts for 36.9% of the variance in handwashing behavior, F (1, 384) =11.6360, p-value=0.0007. This study proposes that public health authorities target people's experiential learning style in designing and delivering intervention programs against non-compliance with proper handwashing