On Fault-Tolerance of Benes Network

Nabanita Das,Jayasree Dattagupta 대한전자공학회 1994 JTC-CSCC : Joint Technical Conference on Circuits Vol.- No.-

Superparamagnetic NiO-doped mesoporous silica flower-like microspheres with high nickel content

Nabanita Pal,Seunghyeok Im,Eun-Bum Cho,Hyunhong Kim,Jongnam Park 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-

Morphology oriented synthesis of metal oxide doped silica structures have fascinating properties whichneeded to be explored extensively. In this work, NiO doped silica microsphere with beautifulflower-likemorphology has been achieved by adopting a facile surfactant-assisted synthetic route using CTAB-ammonia in H2O–ethanol mixed solvent media. The sol–gel synthesis with effective variations of Ni/Si ratiosup to 7.0, followed by a simple hydrothermal treatment and subsequent calcination leads to the formation ofNiO–silica mesostructures with high nickel content. Detailed structural and elemental characterizations byusing powder X-ray analysis (XRD), scanning electron (SEM) and transmission electron microscopy (TEM),N2 adsorption–desorption, X-ray photoelectron spectroscopy (XPS) revealed that single cubic phase NiOdoped mesoporous silica microspheres (for Ni/Si = 5:1 and 7:1) with good surface area (169 and 205 m2 g 1for sample with Ni/Si = 7:1 and 5:1, respectively) and pore width 3–5 nm, have been formed with 3Dflower-like shape and 500–600 nm particle size. These NiO–silica microspheres containing high Ni content up to 76wt% have shown excellent paramagnetic properties at room temperature.

$I_{\lambda}$-convergence in intuitionistic fuzzy $n$-normed linear space

Nabanita Konwar,Pradip Debnath 원광대학교 기초자연과학연구소 2017 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.13 No.1

The notion of lacunary ideal convergence in intuitionistic fuzzy normed linear space (IFNLS) was introduced by the present corresponding author [P. Debnath, Lacunary ideal convergence in intuitionistic fuzzy normed linear spaces, Comput. Math. Appl., 63 (2012), 708-715] and an open problem in that paper was whether every lacunary $I$-convergent sequence is lacunary $I$-Cauchy. Further, a new concept of convergence of sequences in an intuitionistic fuzzy $n$-normed linear space (IFnNLS) was given in [M. Sen, P. Debnath, Lacunary statistical convergence in intuitionistic fuzzy $n$-normed linear spaces, Math. Comput. Modelling, 54 (2011), 2978-2985]. With the help of this new definition of convergence, the main aim of this paper is to introduce the concept of $I_{\lambda}$-convergence in an IFnNLS, where $I$ is an ideal of a family of subsets of positive integers $\mathbb{N}$. We also define $I_{\lambda}$-limit points and $I_{\lambda}$-cluster points and establish relations between them. Finally we introduce the notion of $I_{\lambda}$-Cauchy sequence in IFnNLS. We improve and extend some existing results and give a positive answer to the open problem mentioned above in the setting of an IFnNLS.

Hierarchical multi-metal-doped mesoporous NiO-silica nanoparticles towards a viable platform for Li-ion battery electrode application

Nabanita Pal,조재원,나르시물루,조은범,유재수 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7

Hierarchical nanostructures have received wide attention for their distinguished physical and chemicalproperties of the synthesized materials, mainly in future energy storage applications. In this study, Ni-based multi-metaldoped silica mesoporous nanoflowers were prepared and characterized as a potential anode material for lithium ionbatteries. A facile synthesis strategy is depicted here for Ni-based multi-metal doped silica mesoporous nanoflowers byusing a CTAB surfactant and ammonia basic media in water-ethanol mixed solvent media. Ce, Al, Mn, and Co specieshave been chosen as other additive metals for doping in this mesostructure in order to find the enhanced electrochemicalperformance of the Ni-based silica. Systematic characterization of the material was performed by transmission electronmicroscopy (TEM), scanning electron microscopy (SEM), wide-angle X-ray diffraction (WA-XRD) analysis andN2 sorption, which show 500-600 nm sized particles with fine-looking nanoflower morphology and surface area in therange of 211-405m2g1. The initial charge/discharge capacity was found to be 1,313/178, 990/436, 1,122/234 and 1,585/689 mA h g1 for different Ni-silica, Ni-Ce-silica, Ni-Al-silica and Ni-Co-Mn-Al-silica electrodes, respectively. Theenhanced electrochemical performance for Ce doped Ni-silica compared to other mesoporous samples may be attributedto improved electrical conductivity as well as the hierarchical nanoflower-like structure.

Climate change and vulnerability assessment in Mousuni Island: South 24 Parganas District

Nabanita Mukherjee,Giyasuddin Siddique 대한공간정보학회 2018 Spatial Information Research Vol.26 No.2

This paper is an endeavor to assess the impact of climate change on physical, ecological and socio economic vulnerability of Mousuni Island which is one of the 10 most vulnerable ocean-confronting Islands in South 24 Parganas District of West Bengal according to WWF India, 2010. Landsat imageries have been analyzed to identify shoreline changes; Spectral Radiance Model and Split Window Algorithm have been executed for land surface temperature change analysis and supervised classification is employed for detecting landuse alteration. Flood prone area has been worked out from modified normalized difference water index and SRTM DEM dataset. Normalized difference vegetation index and normalized difference salinity index are also employed to find out change in forest cover and salinity respectively. Socio-economic vulnerability has been identified by primary survey and secondary data sources. The result indicates that climate change causes vulnerability of life processes of rural folk forcing them to become ecological refugees.

Surfactant-assisted synthesis of ceria–titania-rich mesoporous silica materials and their catalytic activity towards photodegradation of organic dyes

Pal, Nabanita,Mukherjee, Indrani,Chatterjee, Sriparna,Cho, Eun-Bum The Royal Society of Chemistry 2017 Dalton Transactions Vol.46 No.29

<▼1><P>A series of Ce–Ti-doped mesoporous silica materials have been prepared under basic conditions. The materials played a pivotal role in visible-light-induced degradation of toxic Rhodamine B.</P></▼1><▼2><P>Ceria–titania doped highly ordered hexagonal and cubic mesoporous silica composite samples with varying amounts of Ce and Ti have been synthesized using hexadecyltrimethylammonium bromide (CTAB) surfactant as a template under basic conditions in the presence of ammonia. The removal of the template resulted in the formation of mesoporous composites doped with Ce and Ti, which were thoroughly characterized <I>via</I> small-angle X-ray scattering (SAXS), wide-angle X-ray diffraction (WAXRD), N2 adsorption, scanning and transmission electron microscopy analysis with energy-dispersive spectrometry mapping (SEM-TEM-EDS), inductively coupled plasma atomic emission spectrophotometry (ICP-AES), and ultraviolet-visible diffuse reflectance spectrometry (UV-visible). The electronic states of Ti and Ce species present on the surface of silica were also investigated by X-ray photoelectron spectroscopy (XPS). The catalytic activity of these Ti-modified ceria–silica samples for the photodecomposition of rhodamine B under visible-light irradiation was investigated. The results revealed that a sample with a higher Ti content, as well as equal amounts of Ce and Ti, displayed higher catalytic activity for the photodegradation of the organic dye rhodamine B.</P></▼2>

Catalytic activity of Ce^IVO₂/Ce₂ ^IIIO₃-silica mesoporous composite materials for oxidation and esterification reactions

Pal, Nabanita,Cho, Eun-Bum,Kim, Dukjoon,Gunathilake, Chamila,Jaroniec, Mietek Elsevier 2015 Chemical Engineering Journal Vol.262 No.-

<P><B>Abstract</B></P> <P>Bifunctional catalytic performance of various ceria-containing mesoporous silica samples have been investigated for oxidation as well as acid-catalyzed esterification reactions under mild conditions. Hexagonal (<I>p</I>6<I>mm</I>) and cubic (<I>Ia</I>3<I>d</I>) ordered mesoporous silica materials with incorporated Ce<SUP>IV</SUP>O<SUB>2</SUB> were synthesized with high Ce content and successfully reduced to Ce<SUB>2</SUB> <SUP>III</SUP>O<SUB>3</SUB>-silica species under H<SUB>2</SUB> gas flow. Small angle X-ray scattering (SAXS) analysis of the samples shows ordered patterns of the materials studied. The surface area and porosity of the samples were determined from N<SUB>2</SUB> adsorption isotherms. Both the oxidation states of ceria have been proved as highly efficient catalysts for liquid phase oxidation of numerous hydrocarbons like cyclohexene, styrene, benzyl alcohol, and xylene and so on at room temperature under solvent-free conditions, whereas Lewis basicity of cerium oxide has been explored for esterification reaction of various alcohols like benzyl alcohol, octanol, and decanol and so on using acetic acid under mild conditions. The surface acidic sites present on both Ce<SUP>IV</SUP>O<SUB>2</SUB>-silica and Ce<SUB>2</SUB> <SUP>III</SUP>O<SUB>3</SUB>-silica composites have been measured and compared by ammonia-TPD analysis performed at 393K. The reusability and heterogeneity of the catalysts with minimum loss have also been examined under identical conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Scale-up synthesis was performed for mesoporous silica/Ce<SUP>IV</SUP>O<SUB>2</SUB> and Ce<SUB>2</SUB> <SUP>III</SUP>O<SUB>3</SUB>-silica composites. </LI> <LI> Ordered mesostructure was preserved for Ce/Si molar ratio up to 0.5. </LI> <LI> Esterification of various alcohols shows high performance under mild temperature conditions. </LI> <LI> Solvent-free oxidation of hydrocarbons shows high performance at room temperature. </LI> <LI> Acylation of various alcohols shows high performance in the presence of acetic acid. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Ce<SUP>IV</SUP>O<SUB>2</SUB> and Ce<SUB>2</SUB> <SUP>III</SUP>O<SUB>3</SUB>-silica composite mesoporous materials are proved to be highly efficient heterogeneous, reusable catalyst for solvent-less oxidation of different hydrocarbons at room temperature as well as acylation of various aromatic and aliphatic alcohols in presence of acetic acid under mild conditions.</P> <P>[DISPLAY OMISSION]</P>

A novel epoxypropoxy flavonoid derivative and topoisomerase II inhibitor, MHY336, induces apoptosis in prostate cancer cells

Patra, Nabanita,De, Umasankar,Kang, Jin-Ah,Kim, Ji Mim,Ahn, Mee Young,Lee, Jaewon,Jung, Jee H.,Chung, Hae Young,Moon, Hyung Ryong,Kim, Hyung Sik Elsevier 2011 european journal of pharmacology Vol.658 No.2

<P><B>Abstract</B></P><P>Here, we reported the synthesis of a novel topoisomerase II inhibitor, MHY336, which that has strong topoisomerase-mediated anticancer activity but fewer side effects than other topoisomerase II inhibitors. The catalytic activity of MHY336 on the topoisomerase II enzyme was the same as that of the etoposide. In a cell-free system, MHY336 exhibited a potent activity on scavenging of reactive oxygen species against 3-morpholinosydnonimine hydrochloride (SIN-1)-induced oxidative stress. An <I>in vitro</I> cell-based assay demonstrated that MHY336 significantly inhibited the proliferation of three prostate cancer cell lines, LNCaP, PC-3, and DU145 cells. Notably, the cytotoxicity of MHY336 was more potent in LNCaP cells (IC<SUB>50</SUB>=1.39μM) than in DU145 (IC<SUB>50</SUB>=2.94μM) and PC3 cells (IC<SUB>50</SUB>=3.72μM). Furthermore, MHY336 treatment induced similar levels of cytotoxicity compared to doxorubicin treatment (IC<SUB>50</SUB>=1.55μM) in LNCap cells. Also, MHY336 significantly down-regulated topoisomerase II alpha expression and up-regulated p53 expression in LNCaP cells (wild-type p53), whereas it up-regulated the topoisomerase II alpha protein in both DU145 and PC3 cells (p53 mutated or deleted). MHY336 induced G2/M or S phase arrest in LNCaP cells through a well-documented topoisomerase II-dependent mechanism. Further studies using Annexin V-FITC binding assay, DAPI staining, and Western blot analyses illustrated that MHY336 markedly induced apoptotic cell death via the mitochondria-mediated intrinsic pathway in LNCaP cells. These results suggest that MHY336 is an attractive chemotherapeutic agent because of its topoisomerase II-mediated anti-tumour activity in human prostate cancer.</P>

Mn-Doped Ordered Mesoporous Ceria–Silica Composites and Their Catalytic Properties toward Biofuel Production

Pal, Nabanita,Cho, Eun-Bum,Kim, Dukjoon,Jaroniec, Mietek American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.29

<P>A series of Mn-doped ordered mesoporous ceria–silica composites was synthesized by using hexadecyltrimethylammonium bromide as a soft template under ammonia basic conditions. After template removal, Mn-doped mesoporous ceria–silica composites were thoroughly characterized by small-angle X-ray scattering, which revealed highly ordered 2D-hexagonal (<I>p</I>6<I>m</I>) framework. Other techniques such as wide-angle X-ray diffraction, N<SUB>2</SUB> adsorption, scanning and transmission electron microscopic analysis with energy-dispersive spectrometry mapping, inductive coupled plasma atomic emission spectrophotometry, ultraviolet–visible spectrometry, and <SUP>29</SUP>Si cross-polarization magic-angle spinning NMR were used to show the effect of Mn incorporation into the ceria–silica composites. The electronic states of the surface Mn and Ce species were also investigated by X-ray photoelectron spectroscopy. These Mn-doped mesoporous ceria–silica composites were successfully reduced under a flowing H<SUB>2</SUB>/N<SUB>2</SUB> gas mixture at an elevated temperature without noticeable changes in their hexagonally ordered mesostructures. These materials were applied as heterogeneous and reusable catalysts for transesterification of different esters, such as methyl benzoate and ethyl cyanoacetate, in the presence of various alcohols, such as <I>n</I>-octanol and <I>n</I>-butanol, to produce biodiesels under solventless mild conditions.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-29/jp504801h/production/images/medium/jp-2014-04801h_0016.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp504801h'>ACS Electronic Supporting Info</A></P>

Fluctuations in fruit fly abundance and infestation in sweet gourd fields in relation to varied meteorological factors

Md Ruhul Amin,Nabanita Paul NANCY,Md. Ramiz Uddin MIAH,Md Giashuddin MIAH,권오석,서상재 한국곤충학회 2019 Entomological Research Vol.49 No.5

The study was conducted with the aim of furthering our understanding of seasonality in the population dynamics and infestation rates of the fruit fly Bactrocera spp. in sweet gourd (Cucurbita moschata) during winter and summer in 2017. We also investigated the effects of using methyl eugenol traps on fly abundance and infestation. Two fruit fly species, namely, B. cucurbitae and B. dorsalis, were present in the sweet gourd field, and we observed fluctuations in their abundance. Compared to B. dorsalis, B. cucurbitae was significantly more abundant in both winter and summer. Infestation level was found to be the highest in fields lacking methyl eugenol traps in both seasons. Fruit fly larval population per infested fruit was higher in summer than in winter. Fly abundance was significantly and positively correlated with mean temperature and rainfall but significantly and negatively correlated with light intensity. Relative humidity was insignificantly but positively correlated with fly abundance. The temperature, light intensity, relative humidity, and rainfall individually explained 48.9, 24.1, 0.8, and 1.6% of variation in fruit fly abundance, respectively. The combined effect of the weather parameters on fruit fly abundance was 75.4% and was significant predictor of fruit fly abundance.