Acinic cell carcinoma, papillary-cystic variant of the parotid gland: A case report with review of literature

SummaryAcinic cell carcinoma (ACC) is a rare, slow growing, low grade neoplasm of salivary glands and some extra salivary sites. ACC-papillary cystic variant is histologically composed of tumor with papillary and cystic growth patterns, with varying proportions of one or more of 5 cell types which include “hobnail” acinar, intercalated, vacuolated, non-specific glandular and clear cells. The clinical picture is not specific and diagnosis is based on the histopathologic examination. The present case describes ACC—papillary cystic variant and discusses the myriad architectural patterns exhibited by it

Relationship Between the Thermodynamic Parameters, Structure, and Anticorrosion Properties of Al-Zr-Ni-Fe-Y Alloys

The influence of the chemical composition on the crystallization process, amorphous phase formation, and the anticorrosion properties of Al-Zr-Ni-Fe-Y alloys are presented. To reduce the number of experiments, a thermodynamic approach was applied in which the entropy and Gibbs free energy of representative alloys were optimized. The low glass-forming ability of Al-Zr-Ni-Fe-Y alloy systems was related to the crystallization of the Al3Zr phase from the melt. The structural analysis showed that phases containing Ni and Fe, such as Al19Ni5Y3, Al10Fe2Y, and Al23Ni6Y4, played a key role in the formation of amorphous alloys. According to this, the simultaneous addition of Ni/Fe and Y is important to prevent the crystallization of Al-based alloys in the melt. The formation of an amorphous phase in Al80Zr5Ni5Fe5Y5 alloys and the complete amorphization of Al85Ni5Fe5Y5 alloys were responsible for the high corrosion resistance compared with fully crystalline alloys. Moreover, the addition of Y had a significant impact on the anticorrosion properties. The XPS results showed that the alloys tended to form a passive Al2O3 and Y2O3 layer on the surface

Quantitative analysis of mast cells in oral submucous fibrosis

Back ground: On the Indian subcontinent, the use of smokeless tobacco in various forms is very popular. Oral submucous fibrosis is a chronic condition of the oral mucosa, which results in a marked rigidity with progressive inability to open the mouth and has an increased risk of undergoing carcinomatous changes about four to eight percent. Objectives: The objective of this study was to evaluate whether early recognization and subsequent prevention of its transformation into an advanced stage would assist in early treatment of this condition. Method: This study was undertaken by retrieving the records and the paraffin blocks of the confirmed cases of 30 oral submucous fibrosis and 10 normal buccal mucosa as control. Two sets of sections were obtained. One set subjected to Toluidine Blue staining and the other set subjected to Hematoxylin & Eosin. Result: The mast cell response in oral sub mucous fibrosis was reported to be high in the early stages where the reaction of the tissue to the irritant is strong. As the disease advances tissue becomes less reactive, gets hyalinized and occasionally shows degeneration where the mast cells are reduced and are often even fewer than in the normal mucosa. Conclusion: Since this disease is known to be prevalent in India due to the habits, the study was conducted to observe different histopathological features and the occurrence of mast cells in various grades of Oral Sub Mucous fibrosis. This study also emphasizes the role of mast cells and its concentration in different grades of OSMF

Adaptive Modularity for Power Electronics Based Electrolysis Systems for Green Hydrogen

Electrolysis holds tremendous potential in reducing the carbon footprint and providing energy dense fuels such as methane. Such systems can be integrated with renewable energy systems with the aid of power electronics interfaces. However, this integration is not straight-forward and imposes various converter design challenges. This paper presents the current state-of-the-art electrolyzer systems, and a simple model of an alkaline regenerative stack with four degrees of freedom. To gain insights with regards to limitations/trade-offs, a sensitivity analysis is conducted on this model. Based on these insights, the challenges associated with power electronics converter design for this application have been discussed along with the trade-offs associated with the electrolyser system. Furthermore, the concept of adaptive modularity for efficiency and reliability improvement has been discussed.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.DC systems, Energy conversion & Storag

Impact of Electrolyzer on the Operation of a Dual Active Bridge Converter

Electrolysis requires a high DC current at low voltage to produce hydrogen from water. Designing power converters for such a load requirement could be challenging while fulfilling the galvanic isolation needs. Therefore, prior knowledge of the electrolyzer's impact on the converter operation should be needed. In this context, this paper investigates the behavior of the Dual Active Bridge (DAB) converter when utilized for electrolysis. A MATLAB simulation of DAB with a 10 kW alkaline electrolyzer is developed. Several converter parameters, such as the phase shift angle, series inductance, peak and RMS currents, and voltage gain, are analyzed during electrolysis. Distinct operating behavior is observed from the analysis.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.DC systems, Energy conversion & Storag

Not Available

Not AvailableNot AvailableNot Availabl

Natural polymer based composite membranes for water purification: a review

The ever-growing population, environmental pollution and ecological degradation cause suffering to human race due to chemicals and other water contaminants such as chemicals, heavy metals, pesticides and insecticides. Hence, attempts are made to purify water by advanced technologies employing smart materials. The advanced nanotechnology aids to control structural and chemical functionality in the composite materials which potentially escort novel membrane module for water purification. This review focuses on the existing membrane technology involved in water purification and portrays molecular-level rationally designed approaches for engineering biopolymer based selective membranes. - 2019, - 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.Scopu