Ali Mousavi

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Modelling static and dynamic hysteresis in time domain reluctance networks

9th IET International Conference on Computation in Electromagnetics (CEM 2014), 2014

ABSTRACT This paper introduces a novel method for taking into account the losses of magnetic mate... more ABSTRACT This paper introduces a novel method for taking into account the losses of magnetic materials in a time domain reluctance network analysis. The reluctance network method is a fast and practical method of electromagnetic analysis of magnetic devices. However, in conventional methods only non-linear properties of magnetic materials are considered. The method presented in this work improves the reluctance network method to manage both static hysteresis and dynamic eddy currents in the time domain. It can be used for calculation of losses and consider their effects in transient studies. The accuracy and efficiency of the method is confirmed by experiment.

Implementation of hysteresis model in transient analysis of nonlinear reluctance networks

This paper introduces a method for implementation of hysteresis models in nonlinear reluctance ne... more This paper introduces a method for implementation of hysteresis models in nonlinear reluctance networks for performing transient analyses. The proposed method for solving the nonlinear circuits is based on local linearization and doesn't have the problems of non-convergency and demands to high number of iteration. The ability of coupling between electrical and magnetic circuit make it very suitable for study transient phenomena in a power network related to nonlinearity of magnetic materials such as ferroresonance, inrush current and DC magnetization.

Psychometric evaluation of the Persian version of the Type 2 Diabetes and Health Promotion Scale (T2DHPS): a diabetes‐specific measure of lifestyle

Scandinavian Journal of Caring Sciences, 2014

BackgroundA healthy lifestyle is important for maintaining health and preventing complications in... more BackgroundA healthy lifestyle is important for maintaining health and preventing complications in patients with type 2 diabetes, and yet, few instruments are available to measure this.AimThe aim of the present study was to examine the psychometrics of a recently developed tool that can be used to screen for a health‐promoting lifestyle in patients with type 2 diabetes.MethodsData were collected from outpatients attending diabetes clinics. The Type 2 Diabetes and Health Promotion Scale (T2DHPS), EQ‐5D, medical records and a demographic questionnaire were administered to 368 participants. Forward–backward translation of the original English version was used to develop a Persian version. Internal consistency of the scale was assessed by Cronbach's alpha and item‐to‐total correlation. Acceptability was measured by assessing floor and ceiling effects for each item and subscale. The item scaling test was used to examine the convergent and discriminant validity of the measure. Pearson ...

Diagnostic Ability of 384-Slice Computed Tomographic Angiography in Prediction of Myocardial Ischemia in Patients with Myocardial Bridging (MB) as Compared to SPECT-MPI Examination

Iranian Journal of Radiology, 2018

Background: During the past decade, coronary computed tomographic angiography (CCTA) has become t... more Background: During the past decade, coronary computed tomographic angiography (CCTA) has become the primary non-invasive imaging technique for the assessment of myocardial bridging (MB). Objectivs: The aim of this study was to evaluate the ability of CCTA to predict myocardial ischemia in patients with MB. Patients and Methods: A total of 32 MB patients (21 males and 11 females) participated in this study. Eleven MB parameters were measured to assess the ability of CCTA to predict MB patients with ischemia. In order to evaluate ischemia, all the patients underwent single positron emission computed tomography-myocardial perfusion imaging (SPECT-MPI) examination. Results: Ischemia was observed in 17 patients (53.1%), while 15 patients (46.9%) did not show signs of ischemia. Out of the 32 patients, superficial MB was observed in 15 patients while deep MB was identified in 12, and borderline was observed in five patients. All MB examined parameters were found to be significantly different between ischemic and non-ischemic patients, except for the location and tunnel artery diameter in diastole. Moreover, a cutoff value of 0.65 mm was able to discriminate ischemia with a sensitivity of 100%, specificity of 93%, and yield area under the receiver operating characteristic (ROC) curve (AUC) of 0.996. Also, by considering the depth cutoff value of 1.75 mm, ischemia can be distinguished with sensitivity and specificity of 100%. MB length had a lower discrimination power, with a cut off value of 22.5 mm yield, 76% sensitivity, 67% specificity, and AUC = 0.810 in the diagnosis of ischemia. Conclusion: CCTA was a reliable modality with high accuracy to depict MB, identify high risk MB, and prevent unnecessary SPECT-MPI examination.

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