High Temperature Deformation Behavior and Processing Maps of FeCoNiCrAlTi Dual Phase High Entropy Alloy

Piyush Kumar,Reliance Jain,M. R. Rahul,Abhijit Ghosh,Sumanta Samal,Gandham Phanikumar 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9

The present study explores the high temperature deformation behavior of FeCoNiCrAlTi dual phase high entropy alloy(henceforth referred to as DP-HEA) in the temperature range of 900–1100 °C (1173–1373 K) and the strain rate varyingfrom 0.001 to 0.1 s−1. The as-cast sample has been characterized using scanning electron microscopy, X-ray diffraction,and differential scanning calorimetry, which reveals the presence of two phases, disordered γ and ordered γ′. A constitutiverelationship between the process parameters (stress temperature, strain, and strain rate) has been drawn using the Arrheniustypeequation to recognize the high temperature deformation behavior of the DP-HEA. The optimum thermomechanicalprocessing window of the DP-HEA has been determined by constructing multiple contour maps based on different parameterssuch as efficiency, strain rate sensitivity, etc. And the optimum processing domain has been found to lie approximately in thetemperature range of 1260–1300 K and SR = 10–2.3–10–2 s−1, 1325–1373 K and SR = 10–1.4–10–1 s−1 & 1173–1193 K andSR = 10–1.3–10–1.55 s−1. Finally, the stable and unstable regimes in the processing maps are correlated with the microstructureof hot deformed samples.

Design and Realization of Fractional Low-Pass Filter of 1.5 Order Using a Single Operational Transresistance Amplifier

Piyush Kumar Tewari,Rachana Arya 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.9

Design of fractional order analog filter, using a single Operational Transresistance Amplifier (OTRA) as an active current mode building block, is presented. The order of the proposed filter is 1.5. The theoretical results have been verified with PSPICE simulation. Obtained filter was realized using OTRA using the RC-RC decomposition technique. Frequency response for the presented filter is shown in the paper. The proposed filter offers some important features: employing single operational transresistance amplifier as an active element, lower sensitivity, insensitive to stray capacitances and parasitic resistances due to internally grounded input terminals of OTRA. Simulation results agree well with the theoretical values.

TURÁN-TYPE INEQUALITIES FOR GAUSS AND CONFLUENT HYPERGEOMETRIC FUNCTIONS VIA CAUCHY-BUNYAKOVSKY-SCHWARZ INEQUALITY

Bhandari, Piyush Kumar,Bissu, Sushil Kumar Korean Mathematical Society 2018 대한수학회논문집 Vol.33 No.4

This paper is devoted to the study of $Tur{\acute{a}}n$-type inequalities for some well-known special functions such as Gauss hypergeometric functions, generalized complete elliptic integrals and confluent hypergeometric functions which are derived by using a new form of the Cauchy-Bunyakovsky-Schwarz inequality. We also apply these inequalities for some sample of interest such as incomplete beta function, incomplete gamma function, elliptic integrals and modified Bessel functions to obtain their corresponding $Tur{\acute{a}}n$-type inequalities.

DEVELOPMENT OF A STANDARD INVENTORY FOR MEASURING ANTECEDENTS OF LUXURY CONSUMPTION IN INDIA

Nikita Sharda,Anil K. Bhat,Piyush Kumar Sinha 글로벌지식마케팅경영학회 2015 Global Fashion Management Conference Vol.2015 No.06

We have examined the antecedents of luxury consumption by conducting a thorough review of literature. Valid scale items for measuring psychological, personal, social, cultural antecedents of luxury consumption in India are proposed. Using Factor Analysis on a sample of 550 responses of the scale items, we have developed a valid questionnaire for Indian luxury consumers. The proposed questionnaire is relevant in context of the proposed model and luxury consumption in India. The proposed questionnaire achieves parsimony in terms of reducing the cardinality of the set of items from 141 to 55.

68Ga-DOTA-RGD2 Uptake in Plantar Fasciitis: New Insights into its Pathogenesis

Piyush Aggarwal,Singh Harmandeep,Kumar Rajender,Aman Sharma 대한핵의학회 2022 핵의학 분자영상 Vol.56 No.3

Plantar fasciitis is chronic degenerative tendinopathy of the plantar fascia. Although it has many treatment modalities, none has been very effective due to the largely unknown pathogenesis of this condition. 68Ga-DOTA-RGD2 has an upcoming role in assessing disease activity and treatment response in rheumatoid arthritis. In the present case, we demonstrate the potential role of angiogenesis imaging in understanding the pathogenesis of plantar fasciitis and provide new opportunities for novel imaging options.

Incidental Muscle Uptake of 177 Lu-DOTATATE in Peripheral Vascular Disease

Piyush Aggarwal,Kunal Ramesh Chandekar,Ashwani Sood,Shakti Zerial,Rajender Kumar,Anindita Sinha 대한핵의학회 2021 핵의학 분자영상 Vol.55 No.6

Somatostatin receptor (SSTR)-based imaging and therapy has emerged as well-established modality in neuroendocrinetumors. However, its role in inflammation imaging is still evolving. We present a 48-year-old male with metastatic neuroendocrinetumor who underwent lutetium-177-based somatostatin receptor-based therapy. The post-therapy scan showed afocal tracer uptake in the left calf muscle in addition to the expected tracer uptake at the primary and metastatic sites. Further,cross-sectional imaging and biochemical investigations revealed peripheral vascular disease (PVD). The incidental traceruptake in the calf on post-therapy scan potentiates the role of somatostatin receptor scintigraphy in identifying macrophagespecificinflammatory reactions.

Versatile Role of 1 8 F-FDG PET/CT in a Patient with Pan-cerebellar Paraneoplastic Manifestation Due to Underlying Hodgkin’s Lymphoma

Piyush Aggarwal,Anwin Joseph Kavanal,Harmandeep Singh,Rajender Kumar,Rajeev Ranjan,Jitupam Baishya,Anish Bhattacharya 대한핵의학회 2021 핵의학 분자영상 Vol.55 No.6

Hodgkin’s lymphoma most commonly presents as painless lymphadenopathy and systemic B symptoms like fever, nightsweats, and weight loss. But rarely, it can present with unusual paraneoplastic manifestations. In the present case, we reporta 30-year-old woman who presented with sub-acute onset pan-cerebellar symptoms. The serum neuronal antibody panel wasnegative. She underwent F-18 FDG PET/CT to evaluate the neoplastic etiology as the underlying cause, which demonstratedboth the primary etiology and the paraneoplastic changes in the brain.

A Study of Antibacterial Activity of Some Novel 8-Methoxy-4-methyl-quinoline Derivatives

Singh, Sheoraj,Kumar, Vikas,Kumar, Ashok,Sharma, Shalabh,Dua, Piyush Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.12

In the present study, some quinoline derivatives have been synthesized like 8-methoxy-4-methyl-2-amino-(3'-chloro-2'-oxo-4'-substituted aryl-1'-azetidinyl)quinolines 8-12 and 8-methoxy-4-methyl-2-amino-(2'-substituted aryl-4'-oxo-1',3'-thiazolidin-3'-yl) quinolines 13-17 from 8-methoxy-4-methyl-2-(substituted arylidenyliminoamino)-quinolines 3-7. The structural assignments of these compounds were based on spectral (IR, $^1H$-NMR, Mass) and elemental (C, H, N) analysis. Further, these compounds were evaluated for antibacterial activity against various bacterial strains. Three compounds 10, 11 and 16 were found to exhibit potent antibacterial activity as compared to the standard drug amphicillin.

Structural, electrical, magnetic and narrow band gap-correlated optical characteristics of multiferroic [Pb(Fe0.5Nb0.5)O3]0.5−[(Ba0.8Sr0.2)TiO3]0.5

Pati Dinesh Kumar,Das Piyush R.,Parida B. N.,Behera B.,Padhee R. 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6

The research article reports the various functional properties of barium strontium titanate [(Ba 0.8Sr0.2)TiO 3]-modifi ed lead iron niobate [Pb(Fe 0.5Nb0.5)O3] ceramic oxide synthesized by the solid-state method. Rietveld and POWD studies proved that the composition crystallizes in tetragonal structure as the primary phase. Ti–O perovskite vibrations were studied by Fourier transform infrared (FTIR) analysis. The TiO 6 octahedral stretching, O–Ti–O vibrations and Nb–O–Fe stretching vibrations of PFN were studied by Raman spectroscopy. The broadening of Raman modes was analysed in the framework of Heisenberg’s uncertainty principle using phonon confi nement model. Field emission gun-scanning electron microscopy (FESEM) and energy-dispersive X-ray spectroscopy (EDS) studies revealed the dense grain distributions, grain growth and purity. UV–visible analysis was done to study the narrow band gap and Urbach energy. The eff ect of structural distortions and electronegativity on band gap were analysed. The photocatalytic response was studied by estimating the band edge levels +/H 2 1 Introduction The search for room temperature multiferroic materials is one of the most vital aspects in the fi eld of material science because of its enormous applications in multi- functional devices. Lead iron niobate (PFN) belongs to the family of multiferroic electroceramics with perovskite structure having formulation ABO 3 or A(B′B″)O3, where B′ and B″ are, respectively, low and high valence cati- ons like Fe 3+ and Nb 5+. The 3d 5 electrons of Fe 3+ boosts magnetic orders and the 6s 2 electrons of Pb 2+ generate the ferroelectric orderings [ 1 ]. PFN ceramics are widely used in device applications [ 2 –4 ] such as multilayer capaci- tors, actuators, transducers and so on due to their large values of relative permittivity, diff use phase transition Vol.:(0123456789) 1 3 using Mulliken’s model. The evaluated conduction band minimum level is suffi ciently negative with respect to the H (0 eV) level, which strongly signifi es the possible occurrence of the photocatalytic hydrogen emission reaction. A detailed electrical analysis was done to study the dielectric properties, relaxation, negative temperature coeffi cient of resistance (NTCR)-type response and DC conductivity. AC conductivity studies revealed the presence of overlapping large polaron tun- nelling (OLPT) model. The eff ect of oxygen vacancies on relaxation and its correlation with activation energy were discussed. Multiferroic nature was confi rmed from room temperature studies of P–E and M–H hysteresis loops. Fe 3+ Fe 3+ (F centre) exchange and Fe 3+ Fe 2+ double exchange mechanisms were discussed. A magnetic improvement was noticed on reduction of temperature to 50 K. The simultaneous existence of weak ferroelectricity and ferromagnetism is one of the interesting outcomes of the present study, which may provide a new multiferroic material for advanced electro-optical applications.

THE EVOLUTION OF A NEW ONLINE DIGITAL MARKET: A MULTISTAKEHOLDER PERSPECTIVE

Mayukh Dass,Piyush Kumar,Srinivas K. Reddy 글로벌지식마케팅경영학회 2018 Global Marketing Conference Vol.2018 No.07

In this research, we investigate the dynamics of one market cycle of Indian art through its various phases of development from early growth to peak and then through a decline. Using the entire online market data for Modern Indian art, we examine how the internal dynamics of the price formation process during auctions changed during the course of this market’s evolution. Our results show that the structure of the price formation process varies systematically over the course of the cycle and the impact of the brand (artist), the product (painting), market information (pre-auction estimates), demand (competition), and consumer (bidder) characteristics changed across the stages of market evolution. Specifically, the revenue, price per square inch, and the number of lots sold (items) from established artists closely followed the overall trend in the market. On the other hand, the number of lots and revenue from emerging artists had a minimal increase during the growth phase of the market. However, these artists maintained their value even when the market was declining. Furthermore, 80% of the lots by established artists beat the preauction estimates during the growth period, compared to only 40% for emerging artists. In contrast, during the decline stage, more lots from emerging artists (8%) beat the preauction estimates than lots from established artists (2%). We also find that bidders entered the auction much earlier during the growth phase of the market than during the maturity and decline stages. These findings have implications for multiple stakeholders in the online art auction market including, sellers, buyers, artists, and auction houses.