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Acta Metallurgica Sinica(English Letters) 2013年第2期26卷 206-216页

作者： Manidipto Mukherjee tapan kumar pal Welding Technology Centre Metallurgical and Material Engineering Department Jadavpur University

The effect of alloy segregation and delta （δ） ferrite contents on surface cracking of three standard （i.e. AISI 304L, AISI 310S and AISI 321） and two low nickel （i.e. LNi-1 and LNi-0.3） austenitic stainless steels （ASS） during hot roiling was investigated using optical microscopy （OM）, automatic image analyzer, scanning electron microscopy （SEM）, energy dispersive X-ray spectroscopy （EDX） and electron probe micro analyzer （EPMA）. It was observed that the amount of 6-ferrite varied among different grades and also distributed heterogeneously across the width of the steel plates. In general, low nickel ASS showed higher amount of 6-ferrite compared to the standard ASS grades. The tendency to surface cracking during hot rolling gradually increased with increasing 6-ferrite content. Interestingly, carbon and nitrogen exerted maximum effect on 6-ferrite formation. The higher carbon and nitrogen content in the steel decreased 6-ferMte content. In addition, the segregation of Cu and Mn plays significant role in low nickel ASS and Ni-Cr in case of standard ASS has profound effect on surface cracking of the steel plates. A possible cause of surface crack formation/origination in steel plates during hot rolling was discussed.

关键词： Austenitic stainless steel Hot rolling Surface cracking Alloy segregation δ ferrite

Development of a new coated electrode with low nickel content for welding ductile iron and its response to austempering

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International Journal of Minerals,Metallurgy and Materials 2018年第9期25卷 1090-1103页

作者： tapan Sarkar Ajit kumar Pramanick tapan kumar pal Akshay kumar Pramanick Welding Technology Centre Jadavpur University Department of Forge Technology NIFFT

Coated Electrodes with small amounts of nickel were developed for welding ductile iron(DI) and conversion of the same into austempered ductile iron(ADI) after austempering. Among six electrodes, Trials 3 and 4 were selected for establishing crack-free weld deposits via preheating and post-weld heat treatment. Austenitization was performed at 900°C for 2 h and austempering at 300 or 350°C for three different holding times to observe the results of austempering with respect to the microstructure, hardness, and austempering kinetics of the samples. The microstructures of the weld deposits showed needle-like bainitic ferrite with small amounts of retained austenite when treated at 300°C and feathery bainitic ferrite with large amounts of retainedaustenite when treated at 350°C. The electrode labeled with Trial 3 revealed greater austenite contents than that labeled with Trial 4 when treated with a 2 h holding time regardless of the austempering temperature applied. The transformation rate of the bainitic ferrite of Trial 3 was relatively higher than that of Trial 4 and showed a lower rate constant, leading to a higher diffusion rate of carbon in austenite.

关键词： electrode development microstructure XRD analysis transformation kinetic microhardness

Organic farming in India: a vision towards a healthy nation

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Food Quality and Safety 2020年第2期4卷 69-76页

作者： Suryatapa Das Annalakshmi Chatterjee tapan kumar pal Department of Food and Nutrition Maharani Kasiswari CollegeUniversity of CalcuttaKolkataIndia Department of Home Science University of CalcuttaKolkataIndia Department of Biotechnology Bengal Institute of TechnologyKolkataIndia

Food quality and safety are the two important factors that have gained ever-increasing attention in general *** grown foods have immense adverse health effects due to the presence of higher pesticide residue,more nitrate,heavy metals,hormones,antibiotic residue,and also genetically modified ***,conventionally grown foods are less nutritious and contain lesser amounts of protective *** the quest for safer food,the demand for organically grown foods has increased during the last decades due to their probable health benefits and food safety *** food production is defined as cultivation without the application of chemical fertilizers and synthetic pesticides or genetically modified organisms,growth hormones,and *** popularity of organically grown foods is increasing day by day owing to their nutritional and health *** farming also protects the environment and has a greater socio-economic impact on a *** is a country that is bestowed with indigenous skills and potentiality for growth in organic *** India was far behind in the adoption of organic farming due to several reasons,presently it has achieved rapid growth in organic agriculture and now becomes one of the largest organic producers in the ***,organic farming has a great impact on the health of a nation like India by ensuring sustainable development.

关键词： food safety organic food biodiversity sustainable farming conventional farming

Development and validation of a high throughput LC–MS/MS method for simultaneous quantitation of pioglitazone and telmisartan in rat plasma and its application to a pharmacokinetic study

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Journal of Pharmaceutical Analysis 2017年第6期7卷 381-387页

作者： Pinaki Sengupta Bappaditya Chatterjee Uttam kumar Mandal Bapi Gorain tapan kumar pal Department of Pharmaceutical Technology Kulliyyah of PharmacyInternational Islamic University MalaysiaMalaysia Lincoln University College Malaysia Bioequivalence Study Centre Jadavpur UniversityKolkataIndia

Management of cardiovascular risk factors in diabetes demands special attention due to their co-existence. Pioglitazone （PIO） and telmisartan （TLM） combination can be beneficial in effective control of cardiovascular complication in diabetes. In this research, we developed and validated a high throughput LC-MS/MS method for simultaneous quantitation of PIO and TLM in rat plasma. This developed method is more sensitive and can quantitate the analytes in relatively shorter period of time compared to the previously reported methods for their individual quantification. Moreover, till date, there is no bioanalytical method available to simultaneously quantitate PIO and TLM in a single run. The method was validated according to the USFDA guidelines for bioanalytical method validation. A linear response of the analytes was observed over the range of 0.005-10 pg/mL with satisfactory precision and accuracy. Accuracy at four quality control levels was within 94.27%-106.10%. The inlxa- and inter-day precision ranged from 2.32% to 10.14% and 5.02% to 8.12%, respectively. The method was reproducible and sensitive enough to quantitate PIO and TLM in rat plasma samples of a preclinical pharmacokinetic study. Due to the potential of PIO-TLM combination to be therapeutically explored, this method is expected to have significant usefulness in future.

关键词： LC-MS/MS Rat plasma Pharmacokinetic applicability Telmisartan Pioglitazone Pharmacokinetic application

High-cycle fatigue behavior of friction stir butt welded 6061 aluminium alloy

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Transactions of Nonferrous Metals Society of China 2014年第3期24卷 648-656页

作者： Hrishikesh DAS Debayan CHAKRABORTY tapan kumar pal Welding Technology Centre Metallurgical and Material Engineering DepartmentJadavpur University

Friction stir welding （FSW） of 6061 aluminium alloy butt joint was carried out at each rotation speed of 600, 800, 1000, 1200 r/min for two different travel speeds, 80 and 100 mm/min, at a constant probe depth of 1.85 mm. The calculated energy input based on the FSW parameters studied shows that the ultimate tensile strength （UTS） of the butt joint is obtained within a certain range of energy input of 297 kJ to 354 kJ out of total range of energy input studied from 196 kJ to 405 kJ. The fatigue behaviors of high-strength and low-strength joints performed at different stress ratios, i.e., 0.5, 0.3, 0.1, -0.3, -0.5, indicate that the fatigue behaviors of both the welds are sensitive to the microstructural features, such as stir zone （SZ）, thermo mechanically affected zone （TMAZ） and heat affected zone （HAZ）. The observed fatigue strengths were discussed in terms of the microstructure, crack path behavior and fracture surface.

关键词： Al alloy friction stir welding (FSW) high cycle fatigue stress ratio (R-ratio) crack path

Effect of Nano Size TiO<sub>2</sub>Particles on Mechanical Properties of AWS E 11018M Type Electrode

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Materials Sciences and Applications 2011年第9期2卷 1285-1292页

作者： tapan kumar pal Utpal kumar Maity 不详

Addition of nano size particles of TiO2 in the coating of shielded metal arc welding electrode (E 11018M) partially substituting the conventional micro size TiO2 was studied for possible enhanced electrode characteristics. The results show that the nano size particle of TiO2 improved recovery of elements such as Mn, Ni, Mo, Ti etc. as well as increased all-weld-metal tensile and charpy impact properties at –51℃. Furthermore, the charpy impact properties were found to be very sensitive to variations in Ti content of the weld deposit.

关键词： High Strength Steel Coated Electrode Nano Size Tio2 Strength and Toughness

Continuous Wave Diode Laser Surface Texturing of Austenitic and Pearlitic Steels

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Materials Sciences and Applications 2015年第10期6卷 889-906页

作者： Sulthan Mohiddin Shariff Suresh Koppoju tapan kumar pal Padmanabham Gadhe Shrikant Viswanath Joshi International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI) Hyderabad India Department of Metallurgical and Materials Engineering Jadavpur University Kolkata India

Microstructuring of steel resulting in directional solidification and texturing, previously observed in various metallic materials during pulsed laser processing, melt-spinning, high-gradient liquid metal melting, zone melting etc., is reported for the first time in continuous wave diode laser processing of steels. Influence of laser interaction time on surface morphology/topology of austenitic manganese and pearlitic steels is investigated utilizing a wide rectangular multi-mode diode laser beam. X-ray diffraction analysis of the laser treated austenitic steel surface showed strong texturing influence, with preferred crystallographic orientation of γ-Fe crystals in the (200) plane, which increased with interaction time. In case of pearlitic steel, no such texturing influence could be observed. The free surface topologies were also observed to be different in each case, with well-aligned domes of γ-Fe observed in laser treated austenitic steel as compared to randomly oriented fine domes of metal oxides in pearlitic one. In situ surface temperature measurement during laser irradiation indicated higher temperature on pearlitic steel than in austenitic manganese steel owing to its lower effective thermal conductivity associated with higher oxide film formation.

关键词： Diode Laser Texturing Pearlitic Steel Austenitic Manganese Steel Directional Solidification Oxidation Surface Morphology Surface Topology

Intricacies during pregnancy with gestational diabetes mellitus

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World Journal of Clinical Cases 2025年第1期13卷 62-64页

作者： Richa Rattan Rimesh pal Parul Chawla Gupta Arvind kumar Morya Ripunjay Prasad Department of Endocrinology Post Graduate Institute of Medical Education and ResearchChandigarh 160012India Department of Ophthalmology Post Graduate Institute of Medical Education and ResearchChandigarh 160012PunjabIndia Department of Ophthalmology All India Institute of Medical SciencesHyderabad 508126TelanganaIndia Department of Ophthalmology RP Eye InstituteDelhi 110001India

The study by Cao et al aimed to identify early second-trimester biomarkers that could predict gestational diabetes mellitus(GDM)development using advanced proteomic techniques,such as Isobaric tags for relative and absolute quantitation isobaric tags for relative and absolute quantitation and liquid chromatography-mass spectrometry liquid chromatography-mass *** analysis revealed 47 differentially expressed proteins in the GDM group,with retinol-binding protein 4 and angiopoietin-like 8 showing significantly elevated serum levels compared to *** these findings are promising,the study is limited by its small sample size(n=4 per group)and lacks essential details on the reproducibility and reliability of the protein quantification methods ***,the absence of experimental validation weakens the interpretation of the protein-protein interaction network identified through bioinformatics *** study's focus on second-trimester biomarkers raises concerns about whether this is a sufficiently early period to implement preventive interventions for *** GDM risk during the first trimester or pre-conceptional period may offer more clinical *** its limitations,the study presents valuable insights into potential GDM biomarkers,but larger,well-validated studies are needed to establish their predictive utility and generalizability.

关键词： Gestational diabetes mellitus Biomarkers Differentially expressed proteins Retinol-binding protein 4 Angiopoietin-like 8 Proteomics Lifestyle interventions Early prediction

Isolation and in vivo hep-atoprotective activity of Melothria heterophylla(Lour.) *** chemically induced liver injuries in rats

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Asian Pacific Journal of Tropical Medicine 2011年第8期4卷 619-623页

作者： Arijit Mondal tapan kumar Maity Dilipkumar pal Santanu Sannigrahi Jagadish Singh Department of Pharmaceutical Technology Jadavpur UniversityKolkata-700 032India School of Pharmaceutical Sciences IFTM UniversityMoradabad-244 001India NSHM College of Pharmaceutical Technology 124 B.L Saha RoadKolkata-700 053West BengalIndia

Objective:To investigate hepatoprotective activity of ethanol extract of Melothria heterophyila Lour Cogn.（EEMH） against CCl4-induced hepatic damage in ***:β-sitosterol was isolated by column chromatography and characterized *** different doses（200 and 400 mg/kg bw） of EEMH were administered orally in alternate *** hepatoprotective activity was studied in liver by measuring biochemical parameters such as serum aspartate amino transferase（AST）,alanine amino transferase（ALT）,alkaline phosphatase（ALP）,total protein and total *** peroxidation product and different antioxidant enzyme activities were assessed in liver ***:EEMH reduced all biochemical parameters and lipid peroxidation,as well as it increased the antioxidant enzyme activities in comparison with *** protective effect of the extract on CCl4 induced damage was confirmed by histopathological examination of the ***:This result strongly supports the protective effect of EEMH against acute liver injury,and may be attributed to its antioxidative activity.

关键词： Carbon tetrachloride Hepatoprotective activity Melothria helerophylla β-sitosterol Silymarin

Full-Duplex Cooperative Relaying with Non-Linear Energy Harvesting for Vehicular Communication

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Journal of Communications and Information Networks 2023年第4期8卷 369-377页

作者： Vaijayanti Panse tapan kumar Jain Indian Institute of Information Technology Nagpur441108India

This paper analyses the performance of fullduplex(FD)dual-hop vehicular cooperative network with decode-and-forward(DF)*** FD relay nodes,we examine the effects of non-linear hybrid power time splitting(PTS)based energy harvesting(EH).All three nodes—source(S),relay(R),and destination(D)are assumed to be moving *** expressions for the system's outage probability(OP)over double(cascaded)Rayleigh fading channels are *** also analyse the impact of residual self-interference(RSI)caused at FD relay on system's *** compare the performance of system with two relay selection techniques,namely,maximum channel gain-based(Max-G)relay selection and minimum RSI-based(Min-SI)relay *** paper considers the joint effect of time splitting ratio and self-interference cancellation(SIC)level to find the optimum EH ***,the effect of time splitting ratio and average signal-to-noise ratio(SNR)on outage and throughput performance of the system are also investigated in this *** derived expressions are validated through Monte Carlo simulations.

关键词： Cooperative communication vehicular networks energy harvesting full-duplex outage probability