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Sonu,Mohit Tyagi,A. Kelkar,A. Sahu,M. Sonawane,P.S. Sarkar,A. Pandey,D.B. Sathe,G.D. Patra,T. Vincent,S.G. Singh,R.B. Bhatt Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
For the precise measurements of special nuclear materials (SNM) including Pu and Am isotopes, we have used phoswich detector combination of two single crystal scintillators of Gd<sub>3</sub>Ga<sub>3</sub>Al<sub>2</sub>O<sub>12</sub>:Ce and CsI:Tl. High detection efficiency and sensitivity along with high figure of merit for the discrimination of these phoswich detectors ensures the detection and discrimination of thermal neutrons and gammas from spontaneous fission of Pu and other isotopes in presence of high gamma background. Using this detector, the low energy gammas, which is stopped completely in 1mm thick disc of GGAG, can be also discriminated from high energies gamma and shows linearity in wide range of sample quantities. By changing only the appropriate shielding, the similar setup was used for thermal neutron detection and shows a very good linearity over wide range. The quantity of a test sample was also calculated accurately by using the measured calibrated plot.
Sonu Rani,Khushboo Kumari,Pankaj Kumar,Shiv Prakash,Kriti Tyagi,Sanjay R. Dhakate,Saroj Kumari 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
The remarkable properties exhibited by carbon fibers have generated considerable interest in seekingalternative approaches to replace time-consuming, energy-intensive, and multi-step procedures for theirsynthesis. Among the various stages involved in carbon fiber synthesis, the stabilization step plays a crucialrole as it necessitates an extended duration to transform thermoplastic pitch-fibers into thermosettingfibers, thus preventing them from melting during high-temperature treatments. In this study,isotropic coal tar pitch (ICTP) was transformed into pitch fibers through melt-spinning process and subsequentlysubjected to chemical treatment for stabilization using varying concentrations (ranging from5% to 50% v/v) of aqueous nitric acid (HNO3) solutions. The objective was to determine the optimal concentrationfor effective stabilization. Consequently, this research eliminates the conventional, timeconsumingair-stabilization process by treating the pitch fibers with nitric acid prior to carbonization. To produce carbon fibers, all chemically stabilized pitch fibers were directly carbonized at 1000 C. Comprehensive characterizations including Rheology, Elemental analysis, FTIR, TGA, FE-SEM, XRD,Raman, and XPS were conducted to investigate the chemical and structural transformations occurringduring the fiber processing. It was observed that aqueous nitric acid solutions ranging from 15% to30% (v/v) exhibited superior structural, morphological, and mechanical properties compared to otherconcentrations of HNO3.
Ram Sonu,YADAVRAJ KUMAR,Singh Indraj 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.6
This article compares engine performance, combustion, and emissions at part-load in cylinder deactivation (CD) mode versus the traditional spark ignition mode. This comparison demonstrates the applicability of cylinder deactivation for a compact 3-cylinder engine. Experiments have been performed on a multi-point fuel injection engine having a 1000 cc displacement and equipped with an open engine control unit. A response surface approach has been applied to design experiments and parametric engine optimization. The analysis of variance test indicates that the load is the input factor that impacts the deactivation mode most. At 3500 RPM and 45 N∙m load, the engine performs best in CD mode, with BSFC, BTE, CP, HRR, and UHC values of 332.805 g/kW-hr, 25.26 %, 52.51 bar, 43.24 J, and 10.38 ppm, respectively. The validation test results for CD mode show that the percentage error for the BSFC, BTE, CP, HRR, and UHC responses was found to be 2.86, 2.91, 3.01, 3.47, and 3.97, respectively, within the acceptable range. As compared to SI mode, the current analysis has discovered a considerable decrease in BSFC (11.47 %), an improvement in BTE (12.25 %), a higher CP (80.65 %), a greater HRR (91.74 %), and a decrease in UHC (95.48 %).