A Novel Method for Making a 2D-FEA Model Considering Three-Dimensional Effect Equivalently in Analysis of Switched Reluctance Motors

AbstractIn contrast to hypertrophic cardiomyopathy, there has been reported no specific pattern of cardiomyocyte array in dilated cardiomyopathy (DCM), partially because lack of alignment assessment in a three-dimensional (3D) manner. Here we have established a novel method to evaluate cardiomyocyte alignment in 3D using intravital heart imaging and demonstrated homogeneous alignment in DCM mice. Whilst cardiomyocytes of control mice changed their alignment by every layer in 3D and position twistedly even in a single layer, termed myocyte twist, cardiomyocytes of DCM mice aligned homogeneously both in two-dimensional (2D) and in 3D and lost myocyte twist. Manipulation of cultured cardiomyocyte toward homogeneously aligned increased their contractility, suggesting that homogeneous alignment in DCM mice is due to a sort of alignment remodelling as a way to compensate cardiac dysfunction. Our findings provide the first intravital evidence of cardiomyocyte alignment and will bring new insights into understanding the mechanism of heart failure.

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Design Considerations and Selection of Cost-Effective Switched Reluctance Drive for Radiator Cooling Fans

Electronics ◽

10.3390/electronics10080917 ◽

2021 ◽

Vol 10 (8) ◽

pp. 917

Author(s):

Ickjin Son ◽

Grace Firsta Lukman ◽

Mazahir Hussain Shah ◽

Kwang-Il Jeong ◽

Jin-Woo Ahn

Keyword(s):

Low Cost ◽

Cost Effective ◽

Magnetic Characteristics ◽

Switched Reluctance Motors ◽

Switched Reluctance ◽

Design Considerations ◽

Cooling Fan ◽

Cooling Fans ◽

Power Switches ◽

Selection Of

Switched reluctance motors (SRMs) are simple in structure, easy to manufacture, magnet-less, brushless, and highly robust compared to other AC motors which makes them a good option for applications that operate in harsh environment. However, the motor has non-linear magnetic characteristics, and it comes with various pole-phase combinations and circuit topologies that causes many difficulties in deciding on which type to choose. In this paper, the viability of SRM as a low-cost, rugged machine for vehicle radiator cooling fan is considered. First, necessary design considerations are presented, then three commonly use types of SRM are analyzed: A 3-phase 6/4, 3-phase 12/8, and a 4-phase 8/6 to find their static and dynamic characteristics so the most suitable type can be selected. Simulation results show that the 8/6 SRM produces the highest efficiency with less phase current which reduces the converter burden. However, with asymmetric half bridge converter, eight power switches are required for 8/6 SRM and thus put a burden on the overall drive cost. As a solution, the Miller converter with only six switches for four phase SRM. To verify the proposed idea, the 8/6 SRM was manufactured and tested. The results show that Miller converter can be used for the proposed SRM with slightly reduced efficiency at 80.4%.

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On-line Detection and Mitigation of Faulty Position-signal for Switched Reluctance Motors

2020 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES) ◽

10.1109/pedes49360.2020.9379611 ◽

2020 ◽

Author(s):

Rajdeep Banerjee ◽

Parthasarathi Sensarma

Keyword(s):

Line Detection ◽

Switched Reluctance Motors ◽

Switched Reluctance ◽

Position Signal ◽

On Line

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The Use of Right Angle Fluorescence Spectroscopy to Distinguish the Botanical Origin of Greek Common Honey Varieties

Applied Sciences ◽

10.3390/app11094047 ◽

2021 ◽

Vol 11 (9) ◽

pp. 4047

Author(s):

Marinos Xagoraris ◽

Panagiota-Kyriaki Revelou ◽

Eleftherios Alissandrakis ◽

Petros A. Tarantilis ◽

Christos S. Pappas

Keyword(s):

Fluorescence Spectroscopy ◽

External Validation ◽

Three Dimensional ◽

Excitation Wavelength ◽

Botanical Origin ◽

Linear Discriminant ◽

Classification Score ◽

Hydroxybenzoic Acids ◽

Unifloral Honey ◽

Novel Method

The standardization of the botanical origin of honey reflects the commercial value and quality of honey. Nowadays, most consumers are looking for a unifloral honey. The aim of the present study was to develop a novel method for honey classification using chemometric models based on phenolic compounds analyzed with right angle fluorescence spectroscopy, coupled with stepwise linear discriminant analysis (LDA). The deconstructed spectrum from three-dimensional-emission excitation matrix (3D-EEM) spectra provided a correct classification score of 94.9% calibration and cross-validation at an excitation wavelength (λex) of 330 nm. Subsequently, a score of 81.4% and 79.7%, respectively, at an excitation wavelength (λex) of 360 nm was achieved. Each chemometric model confirmed its power through the external validation with a score of 82.1% for both. Differentiation could be correlated with hydroxycinnamic and hydroxybenzoic acids, which absorb in this region of the spectrum. Fluorescence spectroscopy constitutes a rapid and sensitive technique, which, when combined with the stepwise algorithm and LDA method, can be used as a reliable and predictive authentication tool for honey. This study indicates that the developed methodology is a promising technique for determination of the botanical origin of common Greek honey varieties. Our long-term ambition is to support producers and suppliers to remain in a competitive national and international market.

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