Information-theoretic meaning of quantum information flow and its applications to amplitude amplification algorithms

Singha Roy, Sudipto,Bae, Joonwoo American Physical Society 2019 Physical Review A Vol.100 No.3

Physicochemical and Microbiological Characteristics of High-Pressure-Processed Ready-to-Eat Hilsa (Tenualosa ilisha) Curry

Kajal Kumar Roy Singha,Nishant R Swami Hulle,Saptashish Deb,P. Srinivasa Rao 한국농업기계학회 2020 바이오시스템공학 Vol.45 No.2

Purpose Hilsa (Tenualosa ilisha) is a commercially significant fish, which is popular as seafood. Although it has a high market value, salted hilsa is usually spoiled by various microorganisms and their metabolic activities that lead to the deterioration of fish quality. Therefore, it is necessary to control the physicochemical and microbiological characteristics of high-quality hilsa products by standardizing the process parameters during their production. Methods Hilsa filets were heat-treated at 75 °C for 5 min and compared with high-pressure-processed samples at different temperatures (40, 50, and 60 °C), pressures (300, 400, and 500 MPa), and hold duration (5, 10, and 15 min). Results The physical, chemical, and microbiological analyses of high-pressure-processed (500 MPa/5 min/50 °C) hilsa fish curry in retort pouch were found to be the most suitable treatment to retain the physicochemical parameters and reduce the microbial load. Moreover, the high-pressure-processed product also received higher sensory scores for texture and color (8.3 and 7.3 out of 10, respectively) compared with the heat-processed curry. Conclusions All the high-pressure treatments showed retention of quality attributes in terms of physical, chemical, and microbiological characteristics of ready-to-eat hilsa curry. This study presents an effective high-pressure processing approach to produce the best quality ready-to-eat hilsa product.

A structural remedy toward bright dipolar fluorophores in aqueous media

Singha, Subhankar,Kim, Dokyoung,Roy, Basab,Sambasivan, Sunderraman,Moon, Hyunsoo,Rao, Alla Sreenivasa,Kim, Jin Yong,Joo, Taiha,Park, Jae Woo,Rhee, Young Min,Wang, Taejun,Kim, Ki Hean,Shin, Youn Ho,Jun Royal Society of Chemistry 2015 Chemical Science Vol. No.

<▼1><P>Structural factors governing the poor emission of dipolar dyes in aqueous media are identified, leading to new acedan derivatives with brighter fluorescence and enhanced two-photon properties.</P></▼1><▼2><P>The donor–acceptor (D–A) type dipolar fluorophores, an important class of luminescent dyes with two-photon absorption behaviour, generally emit strongly in organic solvents but poorly in aqueous media. To understand and enhance the poor emission behaviour of dipolar dyes in aqueous media, we undertake a rational approach that includes a systematic structure variation of the donor, amino substituent of acedan, an important two-photon dye. We identify several factors that influence the emission behaviour of the dipolar dyes in aqueous media through computational and photophysical studies on new acedan derivatives. As a result, we can make acedan dyes emit bright fluorescence under one- and two-photon excitation in aqueous media by suppressing the liable factors for poor emission: 1,3-allylic strain, rotational freedom, and hydrogen bonding with water. We also validate that these findings can be generally extended to other dipolar fluorophores, as demonstrated for naphthalimide, coumarin and (4-nitro-2,1,3-benzoxadiazol-7-yl)amine (NBD) dyes. The new acedan and naphthalimide dyes thus allow us to obtain much brighter two-photon fluorescent images in cells and tissues than in their conventional forms. As an application of these findings, a thiol probe is synthesized based on a new naphthalimide dye, which shows greatly enhanced fluorescence from the widely used <I>N</I>,<I>N</I>-dimethyl analogue. The results disclosed here provide essential guidelines for the development of efficient dipolar dyes and fluorescence probes for studying biological systems, particularly by two-photon microscopy.</P></▼2>

Does Inward Foreign Direct Investments Affect Export Performance of Micro Small and Medium Enterprises in India? An Empirical Analysis

SINGHA, Seema,KUMAR, Brajesh,CHOUDHURY, Soma Roy Dey Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.9

This article examines the effect of inward foreign direct investments (FDI) on the export performance of micro, small & medium enterprises (MSMEs) in India, and investigates the spillover impact and absorption capacity of the MSMEs sector. For the first time, the researchers applied the intersectoral linkage approach to investigate the matter and used a panel dataset between 2006 and 2017. The coefficients of forward and backward linkages are estimated by using the Rasmussen method, the study employs a basic linear panel data model, followed by various diagnostic tests to identify the problem of heteroscedasticity, autocorrelation / serial correlation, cross-sectional dependencies, multicollinearity, time-individual specific tests, and unobserved effects. The PCSE model was applied for robust standard error and the Hausman-Taylor IV model to check the robustness of the result generated in the linear panel data model. Despite the high prevalence of forward and backward intersectoral connections and the Lack of absorption capacity of local firms, the results show that FDI has little of an impact on the export performance of micro, small, and medium-sized businesses in India. This study adds to the existing literature on determining local firms' spillover effect and absorption capacity in response to inward FDI.

Benford analysis of quantum critical phenomena: First digit provides high finite-size scaling exponent while first two and further are not much better

Bera, Anindita,Mishra, Utkarsh,Singha Roy, Sudipto,Biswas, Anindya,Sen(De), Aditi,Sen, Ujjwal Elsevier 2018 Physics Letters A Vol.382 No.25

<P><B>Abstract</B></P> <P>Benford's law is an empirical edict stating that the lower digits appear more often than higher ones as the first few significant digits in statistics of natural phenomena and mathematical tables. A marked proportion of such analyses is restricted to the first significant digit. We employ violation of Benford's law, up to the first four significant digits, for investigating magnetization and correlation data of paradigmatic quantum many-body systems to detect cooperative phenomena, focusing on the finite-size scaling exponents thereof. We find that for the transverse field quantum <I>XY</I> model, behavior of the very first significant digit of an observable, at an arbitrary point of the parameter space, is enough to capture the quantum phase transition in the model with a relatively high scaling exponent. A higher number of significant digits do not provide an appreciable further advantage, in particular, in terms of an increase in scaling exponents. Since the first significant digit of a physical quantity is relatively simple to obtain in experiments, the results have potential implications for laboratory observations in noisy environments.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Benford's law states that lower digits appear more often than higher ones as first few significant digits. </LI> <LI> First significant digit of observable enough to capture quantum phase transition with high finite-size scaling exponent. </LI> <LI> Higher number of significant digits don't provide appreciable further advantage. </LI> <LI> Results potentially important for observations in noisy environments. </LI> </UL> </P>

Influence of mineral by-products on compressive strength and microstructure of concrete at high temperature

Sahani, Ashok Kr.,Samanta, Amiya K.,Roy, Dilip K. Singha Techno-Press 2019 Advances in concrete construction Vol.7 No.4

In the present work, Granulated Blast Furnace Slag (GBFS) and Fly ash (FA) were used as partial replacement of Natural Sand (NS) and Ordinary Portland Cement (OPC) by weight. One control mix, one with GBFS, three with FA and three with GBFS-FA combined mixes were prepared. Replacements were 50% GBFS with NS and 20%, 30% and 40% FA with OPC. Preliminary investigation on development of compressive strength was carried out at 7, 28 and 90 days to ensure sustainability of waste materials in concrete matrix at room temperature. After 90days, thermo-mechanical study was performed on the specimen for a temperature regime of $200^{\circ}-1000^{\circ}C$ followed by furnace cooling. Weight loss, visual inspection along with colour change, residual compressive strength and microstructure analysis were performed to investigate the effect of replacement of GBFS and FA. Although adding waste mineral by-products enhanced the weight loss, their pozzolanicity and formation history at high temperature played a significant role in retaining higher residual compressive strength even up to $800^{\circ}C$. On detail microstructural study, it has been found that addition of FA and GBFS in concrete mix improved the density of concrete by development of extra calcium silicate gel before fire and restricts the development of micro-cracks at high temperature as well. In general, the authors are in favour of combined replacement mix in view of high volume mineral by-products utilization as fire protection.

Selective Oxidation of Olefins Catalyzed by Polymer-anchored Nickel(Ⅱ) Complex in Water Medium

Manirul Islam,Dildar Hossain,Paramita Mondal,Anupam Singha Roy,Sanchita Mondal,Manir Mobarak 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.12

Selective oxidation of olefins has been carried out in water medium with tert-butylhydroperoxide (TBHP, 70% aqueous)as an oxidant using polymer-anchored Ni(Ⅱ) complex as a catalyst. Several parameters were varied to optimize the reaction conditions. Under the optimized reaction conditions olefins gave selectively allylic oxidation products. The present polymer anchored Ni(Ⅱ) complex can be recycled five times without any appreciable loss in catalytic activity.

Selective Oxidation of Olefins Catalyzed by Polymer-anchored Nickel(II) Complex in Water Medium

Islam, Manirul,Hossain, Dildar,Mondal, Paramita,Roy, Anupam Singha,Mondal, Sanchita,Mobarak, Manir Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.12

Selective oxidation of olefins has been carried out in water medium with tert-butylhydroperoxide (TBHP, 70% aqueous) as an oxidant using polymer-anchored Ni(II) complex as a catalyst. Several parameters were varied to optimize the reaction conditions. Under the optimized reaction conditions olefins gave selectively allylic oxidation products. The present polymer anchored Ni(II) complex can be recycled five times without any appreciable loss in catalytic activity.

Effect of Dipolar Molecule Structure on the Mechanism of Graphene-Enhanced Raman Scattering

Joo, Yongho,Kim, Myungwoong,Kanimozhi, Catherine,Huang, Peishen,Wong, Bryan M.,Singha Roy, Susmit,Arnold, Michael S.,Gopalan, Padma American Chemical Society 2016 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.120 No.25

<P>Graphene-enhanced Raman scattering (GERS) is a promising characterization technique which uses a single layer of graphene. As the electronic coupling of adsorbates with graphene leads to enhancement in the Raman signal, it is of immense interest to explore the factors that affect the coupling of the adsorbates with graphene. To probe this effect we have designed and synthesized a series of dipolar molecules with the general structure, N-ethyl-N-(2-ethyl(1-pyrenebutyrate)-4-(4-R-phenylazo)aniline) where the R-groups are varied from methoxy (-OCH3), methyl (-CH3), hydrogen (-H), nitrile (-CN), nitro (-NO2) to tricyanofuran (TCF) groups. This systematically changes the dipole moments and electronic/optical band gap of the molecules. By noncovalently interfacing these molecules on graphene, the Raman signal is enhanced by a factor of 40-90 at the excitation wavelength of 532 nm. Measurements of the Raman enhancement factor and Raman cross section are complemented with DFT calculations to correlate the dipole moment and the energy level of the hybrid to the Raman scattering efficiency. These studies highlight the relevance of the dipolar nature of chromophores, which determines their dipole moment and the band gap, and the resulting electronic coupling to graphene which simultaneously alters the energy level of the orbitals in the molecule and the Fermi level in graphene, resulting in efficient Raman excitations and GERS.</P>