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Extensive Analysis of Multi Strand Billet Caster Tundish Using Numerical Technique

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World Journal of Mechanics 2019年第2期9卷 29-51页

作者： rohit agarwal Mrityunjay K. Singh Ram Bachchan Kumar Biswajit Ghosh Sudhansu Pathak Tata Steel Limited Jamshedpur India

Continuous casting of steel involving different grades in the same casting sequence remains a challenge to billet caster operators. The intermixed composition obtained during the grade change does not meet the specification of either grade and must be downgraded. Incorrect identification of this intermixed region may result in non-conforming products reaching the customer. In this study, a numerical model based on CFD (computational fluid dynamics approach) has been developed which predicts the start and end of the intermixed composition and the tonnage to be downgraded under different casting conditions. This model was validated and the results were in good agreement with the actual plant data for a 6-strand billet caster at LD-1 of TATA Steel, India. This model is used to calculate transition tonnage for different scenarios, e.g. when one of the outermost strands is not functional or some combinations are not functional and varying casting speed during operation. Furthermore, impact of different design of baffles on performance of Tundish has been evaluated to find a way to reduce transition or intermixed composition.

关键词： Continuous Casting CFD Billet Tundish Grade Change Modelling Quality Control Fluid Flow Heat Transfer

Identifying malicious accounts in blockchains using domain names and associated temporal properties

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Blockchain(Research and Applications) 2023年第3期4卷 39-51页

作者： rohit Kumar Sachan Rachit agarwal Sandeep Kumar Shukla C3i Hub Indian Institute of Technology KanpurKanpur 208016India CSE Department Indian Institute of Technology KanpurKanpur 208016India Bennet University Greater Noida 201310India Merkle Science Bangalore 560102India

The rise in the adoption of blockchain technology has led to increased illegal activities by cybercriminals costing billions of *** machine learning algorithms are applied to detect such illegal *** algorithms are often trained on the transaction behavior and,in some cases,trained on the vulnerabilities that exist in the *** our approach,we study the feasibility of using the Domain Name(DN)associated with the account in the blockchain and identify whether an account should be tagged malicious or ***,we leverage the temporal aspects attached to the *** approach achieves 89.53%balanced-accuracy in detecting malicious blockchain *** our results identify 73769 blockchain DNs that show malicious behavior at least once,out of these,34171 blockchain DNs show persistent malicious behavior,resulting in 2479 malicious blockchain DNs over ***,none of these identified malicious DNs were reported in new officially tagged malicious blockchain DNs.

关键词： Blockchain Machine learning Suspect identification Domain name Temporal properties

Correlation between tear fluid and serum vitamin D levels

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Eye and Vision 2016年第1期3卷 178-182页

作者： Swaminathan Sethu rohit Shetty Kalyani Deshpande Natasha Pahuja Nandini Chinnappaiah Aarti agarwal Anupam Sharma Arkasubhra Ghosh GROW Research Laboratory Narayana Nethralaya Foundation#258/A Hosur RoadNarayana Health CityBommasandra560099 BangaloreIndia Cornea and Refractive Surgery Division Narayana NethralayaBangaloreIndia

Background:Vitamin D deficiency is associated with a range of systemic diseases including ocular *** objective of this study is to measure tear vitamin D levels and investigate the correlation between serum and tear vitamin D ***:A total of 48 healthy volunteers without any systemic and ocular disease were recruited for this observational cohort *** was collected using clot activator coated Vacutainer®Plus *** fluid was collected using Schirmer’s *** and tear total 25-hydroxyvitamin D levels were measured by competitive chemiluminescent ELISA and the correlation between the levels were ***:The measured serum 25-hydroxyvitamin D level ranged between 3.3 and 27.5 ng/ml(Mean±SEM,9.4±0.7 ng/ml;Median 8.4 ng/ml).Significantly(p<0.0001)higher level of 25-hydroxyvitamin D was detected in the tears(Mean±SEM,17.0±1.6 ng/ml;Range 3.2–45.8 ng/ml;Median,16.3 ng/ml)compared to *** average of~2 fold(Mean±SEM,1.9±0.2;Range 0.4–5.8;Median,1.7)higher 25-hydroxyvitamin D was observed in tears compared to serum in the *** addition,a positive correlation was observed between serum and tear 25-hydroxyvitamin D levels(r=0.5595;p<0.0001).Conclusions:A higher level of 25-hydroxyvitamin D was observed in the tear fluid compared to that of the *** would be beneficial to consider tear vitamin D levels to study its role with reference to ocular surface diseases.

关键词： Vitamin D 25-hydroxyvitamin D 1,25-dihydroxyvitamin D Tears Serum

Miliary nodules due to secondary pulmonary hemosiderosis in rheumatic heart disease

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World Journal of Radiology 2011年第2期3卷 51-54页

作者： Gyanendra Agrawal Ritesh agarwal Manoj Kumar rohit Venkat Mahesh Rakesh Kumar Vasishta Department of Pulmonary Medicine Postgraduate Institute of Medical Education and Research Department of Cardiology Postgraduate Institute of Medical Education and Research Department of Histopathology Postgraduate Institute of Medical Education and Research

Pulmonary hemosiderosis is defined as the clinical and functional consequence of iron overload of the lungs,which usually occurs due to recurrent intra-alveolar *** can manifest as miliary mottling and should be entertained in the differential diagnosis of patients presenting with miliary nodules on chest radiography,especially those with mitral *** management of secondary pulmonary hemosiderosis secondary to valvular heart disease includes valvuloplasty and/or valve *** radiological opacities may disappear with successful treatment of the underlying valvular disease in many ***,they may persist with no physiological impairment to the ***,we present a 32-year-old man with mitral stenosis who presented with fever and miliary shadows on chest radiography,which was ultimately diagnosed as secondary pulmonary hemosiderosis.

关键词： Miliary nodules Mitral stenosis Tuberculosis:Hemosiderosis