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Accretion properties of MAXI J1813-095 during its failed outburst in 2018

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Research in Astronomy and Astrophysics 2021年第5期21卷 235-246页

作者： Arghajit Jana Gaurava K.Jaisawal Sachindra Naik Neeraj Kumari Debjit chatterjee kaushikchatterjee Riya Bhowmick Sandip KChakrabarti Hsiang-Kuang Chang Dipak Debnath Astronomy&Astrophysics Division Physical Research LaboratoryNavrangpuraAhmedabad 380009India National Space Institute Technical University of DenmarkElektrovej327-328DK-2800 LyngbyDenmark High Energy Astrophysics Indian Centre for Space PhysicsGaria St RoadKolkata 700084India Department of Physics Indian Institute of TechnologyGandhinagar 382355GujaratIndia Indian Institute of Astrophysics KoramangalaBangalore 560034India Department of Physics “National Tsing Hua University”Hsinchu 30013China

We present the results obtained from detailed timing and spectral studies of a black hole candidate MAXI J1813-095 using Swift,NICER,and NuSTAR observations during its 2018 *** timing behavior of the source is mainly studied by examining NICER light curves in the 0.5−10 keV *** did not find any signature of quasi-periodic oscillations in the power density spectra of the *** carry out spectral analysis with a combined disk blackbody&power law model,and physical two-component advective flow(TCAF)*** the combined disk blackbody&power-law model,we extracted thermal and non-thermal fluxes,photon index and inner disk *** also find evidence for weak reflection in the *** have tested the physical TCAF model on a broadband spectrum from NuSTAR and Swift/*** parameters like mass accretion rates,the size of Compton clouds and the shock strength are *** result affirms that the source remained in the hard state during the entire outburst which indicates a‘failed’*** estimate the mass of the black hole as 7.4±1.5M⊙from the spectral study with the TCAF *** apply the LAOR model for the Fe K line *** this,the spin parameter of the black hole is ascertained as a^(∗)>*** inclination angle of the system is estimated to be in the range of 28°−45°from the reflection *** find the source distance to be∼6 kpc.

关键词： X-Rays:binaries stars individual:(MAXI J1813-095) stars:black holes accretion,accretion disks–shock waves radiation:dynamics

Common polymorphisms of protein tyrosine phosphate non-receptor type 2 gene are not associated with risk of Crohn’s disease in Indian

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World Journal of Gastrointestinal Pathophysiology 2022年第4期13卷 114-123页

作者： kaushik chatterjee Amit Kumar Dutta Ashish Goel Rekha Aaron Vijayalekshmi Balakrishnan Ajith Thomas Anoop John Rajeeb Jaleel Deepu David Reuben Thomas Kurien SD Chowdhury Ebby George Simon AJ Joseph Prasanna Premkumar Anna B Pulimood Department of Gastrointestinal Sciences Christian Medical College and HospitalVellore 632004Tamil NaduIndia Department of Gastroenterology Christian Medical CollegeVellore 632004Tamil NaduIndia Departments of Biostatistics Christian Medical CollegeVellore 632004Tamil NaduIndia

BACKGROUND Multiple genetic risk factors for Crohn’s disease(CD)have been ***,these observations are not consistent across different *** protein tyrosine phosphate non-receptor type 2(PTPN2)gene plays a role in various aspects of host defense including epithelial barrier function,autophagy,and innate and adaptive immune *** common polymorphisms in the PTPN2 gene(rs2542151 and rs7234029)have been associated with risk of CD in Western *** To evaluate the association of PTPN2 gene polymorphisms with risk of CD in Indian *** We conducted a prospective case-control *** with CD were recruited,and their clinical and investigation details were *** were patients without organic gastrointestinal disease or other comorbid *** common polymorphisms in the PTPN2 gene(rs2542151 and rs7234029)were *** was extracted from peripheral blood samples of cases and controls and target DNA was amplified using specific sets of *** amplified fragments were digested with restriction enzymes and the presence of polymorphism was detected by restriction fragment length *** frequency of alleles was *** frequencies of genotypes and alleles were compared between cases and controls to look for significant *** A total of 108 patients with CD(mean age 37.5±12.7 years,females 42.6%)and 100 controls(mean age 39.9±13.5 years,females 37%)were *** the single nucleotide polymorphism(SNP)rs7234029,the overall frequency of G variant genotype(AG or GG)was noted to be significantly lower in the cases compared to controls(35.2%vs 50%,P=0.05).For the SNP rs2542151,the overall frequency of G variant genotype(GT or GG)was noted to be similar in cases compared to controls(43.6%vs 47%,P=0.73).There were no significant differences in minor allele(G)frequency for both polymorphisms between the cases and *** the SNPs had no significant association with a

关键词： PTPN2 gene Crohn’s disease Genetic polymorphism Case-control study Asia Risk factor

Automatic relationship extraction from agricultural text for ontology construction

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Information Processing in Agriculture 2018年第1期5卷 60-73页

作者： Neha kaushik Niladri chatterjee Indian Institute of Technology Delhi Hauz KhasNew Delhi 110016India

In the present era of Big Data the demand for developing efficient information processing techniques for different applications is expanding *** such possible application is automatic creation of *** an ontology is often found to be helpful for answering queries for the underlying *** present work proposes a scheme for designing an ontology for agriculture *** proposed scheme works in two *** the first step it uses domain-dependent regular expressions and natural language processing techniques for automatic extraction of vocabulary pertaining to agriculture *** the second step semantic relationships between the extracted terms and phrases are identified.A rulebased reasoning algorithm RelExOnt has been proposed for the said *** evaluation of the term extraction output yields precision and recall of 75.7%and 60%,*** relation extraction algorithm,RelExOnt performs well with an average precision of 86.89%.

关键词： Relation extraction Term EXtraction NLP Ontology Knowledge-based relation extraction Self-supervised relation extraction

multi-solitons interaction multicomponent plasma extended Poincare–Lighthill–Kuo method head-on collision

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Communications in Theoretical Physics 2016年第2期65卷 237-246页

作者： kaushik Roy Malay Kumar Ghorui Prasanta chatterjee Mouloud Tribeche Beluti M.K.M. High School P.O. -Beluti Dist. Birbhum West Bengal-731301 India Department of Mathematics Siksha Bhavana Visva Bharati University Santiniketan-731235 India plasma Physics Group Theoretical Physics Laboratory Faculty of Physics University of Bab-Ezzouar USTHB B.P. 32 E1 Alia Algiers 16111 Algeria

The propagation and interaction between ion acoustic multi-solitons in an unmagnetized multicomponent plasma consisting of fluid hot ions, positrons and both hot and cold electrons, are investigated by employing the extended Poincare–Lighthill–Kuo（PLK） method. Two different Kortewege-de Vries（K-dV） equations are derived. The Hirota＇s method is applied to get the K-dV multi-solitons solution. The phase shift due to the overtaking and head- on collision of the multi-solitons is obtained.

关键词： Head-on Collision of Ion-acoustic Multi-Solitons in e-p-i Plasma

Soil carbon pools of six ecological regions of the United States

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Journal of Forestry Research 2020年第5期31卷 1933-1938页

作者： Amitava chatterjee Department of Soil Science North Dakota State UniversityFargoND 58108-6050USA

Mineralisable soil organic carbon(SOC)pools vary with ecosystem type in response to changes in climate,vegetation and soil *** the effect of climate and soil factors on SOC pools is critical for predicting change over *** soil samples from six ecoregions of the United States were analyzed for permanganate oxidizable C(KMnO4-C)and mineralizable C *** of SOC ranged from 7.9 mg g^-1(Florida site)to 325 mg g^-1(Hawaii site).Mineralisable C pools and KMnO4-C were highest in soils from the Hawaii *** annual precipitation explains SOC and resistant C pool *** content was related to mineralisable active C pools and bacterial *** annual precipitation and clay content are potential variables for predicting changes in SOC pools at large spatial scales.

关键词： Permanganate oxidizable carbon(KMnO4-C) Resistant carbon pool Mean residence time Soil carbon pools United States

Development of a Tribofidelic Human Heel Surrogate for Barefoot Slip Testing

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Journal of Bionic Engineering 2022年第2期19卷 429-439页

作者： Subhodip chatterjee Arnab Chanda Centre for Biomedical Engineering Indian Institute of Technology DelhiNew Delhi 110016India Department of Biomedical Engineering All India Institute of Medical ScienceNew Delhi 110029India

Barefoot slips contribute to over 37% of recurrent fall-related injuries across all age *** study slip risk across a wide range of flooring conditions,slip meters with barefoot surrogates(i.e.,sensors,as per ASTM standard nomenclature)such as animal skins and rubbers have been used to date,which exhibit biomechanical and frictional properties widely different from the barefoot human *** of a surrogate which can accurately simulate the human heel skin properties would be immensely beneficial for realistic assessment of barefoot slipping risk.A novel surrogate was developed using 3D scanning and printing,and biomimetics,which precisely simulates the biomechanical and frictional properties of the barefoot human heel *** slip testing was conducted with this surrogate on three common bathroom floorings and with six different *** of Friction(COF)results similar to human slipping experiments,high repeatability and reproducibility across wet and oily flooring conditions,were confirmed through experiments with the developed heel skin *** heel skin surrogate would be an indispensable model for accurate estimation of barefoot risk against slips and falls in bathrooms,bathtubs,and swimming pools.

关键词： Barefoot Surrogate Slip Fall Bathroom Bathtub

Isolation and characterization of a profenofos degrading bacterium

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Journal of Environmental Sciences 2009年第11期21卷 1591-1597页

作者： Saadatullah Malghani Nivedita chatterjee Key Laboratory of Biogeology and Environmental Geology Ministry of Education of China School of Environmental StudiesChina University of Geosciences

Profenofos, a well known organophosphate pesticide, has been in agricultural use over the last two decades for controlling Lepidopteron pests of cotton and tobacco crops. In this study, a bacterial strain, OW, was isolated from a long term profenofos exposed soil by an enrichment technique, and its ability to degrade profenofos was determined using gas chromatography. The isolated strain OW was identified as Pseudomonas aeruginosa according to its physiological and biochemical properties, and the analysis of its 16S rRNA gene sequence. The strain grew well at pH 5.5-7.2 with a broad temperature profile. Bioremediation of profenofos-contaminated soil was examined using soil treated with 200 μg/g profenofos, which resulted in a higher degradation rate than control soils without inoculation. In a mineral salt medium （FTW）, removal in the level of profenofos of 86.81% was obtained within 48 h of incubation. The intermediates of profenofos metabolism indicated that the degradation occurred through a hydrolysis mechanism, and one of the metabolites was found to be 4 bromo-2-cholorophenol （BCP） which in turn was also mineralized by the strain. The results of this study highlighted the potentiality of P. aeruginosa as a biodegrader which could be used for the bioremediation of profenofos contaminated soil.

关键词： profenofos organophosphate pesticide Pseudomonas aeruginosa

Novel synthesis with an atomized microemulsion technique and characterization of nano-calcium carbonate(CaCO_3)/poly(methyl methacrylate) core-shell nanoparticles

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Particuology 2013年第6期11卷 760-767页

作者： Aniruddha chatterjee Satyendra Mishra University Institute of Chemical Technology North Maharashtra University

The synthesis of hard-core/soft-shell calcium carbonate （CaCO3）/poly（methyl methacrylate）（PMMA） hybrid structured nanoparticles （〈100nm） by an atomized microemulsion polymerization process is reported. The polymer chains were anchored onto the surface of nano-CaCO3 through use of a cou- pling agent, triethoxyvinyl silane （TEVS）. Ammonium persulfate （APS）, sodium dodecyl sulfate （SDS） and n-pentanol were used as the initiator, surfactant and cosurfactant, respectively. The polymeriza- tion mechanism of the core-shell latex particles is discussed. The encapsulation of nano-CaCO3 by PMMA was confirmed using a transmission electron microscope （TEM）. The grafting percentage of the core-shell particles was investigated by thermogravimetric analysis （TGA）. The nano-CaCO3/PMMA core-shell par- ticles were characterized by Fourier transform infrared （FTIR） spectroscopy and differential scanning calorimetry （DSC）. The FTIR results revealed the existence of a strong interaction at the interface of the nano-CaCO3 particle and the PMMA, which implies that the polymer chains were successfully grafted onto the surface of the nano-CaCO3 particles through the link of the coupling agent, In addition, the TGA and DSC results indicated an enhancement of the thermal stability of the core-shell materials compared with that of the pure nano-PMMA, The nano-CaCO3/PMMA particles were blended into a polypropylene （PP） matrix by melt processing. It can also be observed using scanning electron microscopy （SEM） that the PMMA chains grafted onto the CaCO3 nanoparticles interfere with the aggregation of CaCO3 in the polymer matrix （PP matrix） and thus improve the compatibility of the CaCO3 nanoparticles with the PP matrix.

关键词： Atomized microemulsion Core-shell nanoparticles Thermal properties Compatibility of core-shell nanoparticles with polymer matrix

Time-dependent diffusive interactions between dark matter and dark energy in the context of k-essence cosmology

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Research in Astronomy and Astrophysics 2021年第1期21卷 15-24页

作者： Abhijit Bandyopadhyay Anirban chatterjee Department of Physics Ramakrishna Mission Vivekananda Educational and Research InstituteBelur MathHowrah 711202India

We investigated the scenario of time-dependent diffusive interaction between dark matter and dark energy and showed that such a model can be accommodated within the observations of luminosity distanceredshift data in Supernova la(SN la)*** obtain constraints on different relevant parameters of this model from the observational *** consider a homogeneous scalar field(t)driven by a k-essence Lagrangian of the form L=V(φ)F(X)with constant potential V(φ)=V,to describe the dynamics of dark energy in this *** the temporal behaviour of the FRW scale factor,the equation of state and total energy density of the dark fluid,extracted from the analysis of SN la(JLA)data,we have obtained the time-dependence of the k-essence scalar field and also reconstructed the form of the function F(X)in the k-essence Lagrangian.

关键词： Dark Energy Dark Matter k-essence