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Prospective,multicentre study of screening,investigation and management of hyponatraemia after subarachnoid haemorrhage in the UK and Ireland

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stroke & Vascular Neurology 2023年第3期8卷 207-216,I0028-I0059页

作者： James J M Loan steven Tominey Kirun Baweja Julie Woodfield Thomas J G Chambers Mark Haley simran s kundu H Y Josephine Tang Anthony N Wiggins Michael T C Poon Paul M Brennan Translational Neurosurgery The University of Edinburgh Centre for Clinical Brain SciencesEdinburghUK Neurosurgery NHS LothianEdinburghUK Neurosurgery Institute of Neurological SciencesGlasgowUK Department of Medicine School of MedicineDentisty and NuringUniversity of GlasgowGlasgowUK Internal Medicine Queen's UniversityKingstonOntarioCanada Centre for Discovery Brain sciences University of EdinburghEdinburghUK Edinburgh Centre for Diabetes and Endocrinology NHS LothianEdinburghUK Radiology University Hospitals Plymouth NHS TrustPlymouthUK Department of Medicine Cork University HospitalUniversity College CorkCorkIreland

Background Hyponatraemia often occurs after subarachnoid haemorrhage(sAH).However,its clinical significance and optimal management are *** audited the screening,investigation and management of hyponatraemia after *** We prospectively identified consecutive patients with spontaneous sAH admitted to neurosurgical units in the United Kingdom or *** reviewed medical records daily from admission to discharge,21 days or death and extracted all measurements of serum sodium to identify hyponatraemia(s were death/dependency at discharge or 21 days and admission duration>10 *** of hyponatraemia with outcome were assessed using logistic regression with adjustment for predictors of outcome after sAH and admission *** assessed hyponatraemia-free survival using multivariable Cox *** 175/407(43%)patients admitted to 24 neurosurgical units developed hyponatraemia.5976 serum sodium measurements were *** osmolality,urine osmolality and urine sodium were measured in 30/166(18%)hyponatraemic patients with complete *** most frequently target daily fluid intake was>3 L and this did not differ during hyponatraemic or non-hyponatraemic episodes.26%(n/N=42/164)patients with hyponatraemia received sodium supplementation.133(35%)patients were dead or dependent within the study period and 240(68%)patients had hospital admission for over 10 *** the multivariable analyses,hyponatraemia was associated with less dependency(adjusted OR(aOR)=0.35(95%CI 0.17 to 0.69))but longer admissions(aOR=3.2(1.8 to 5.7)).World Federation of Neurosurgical societies grade I-III,modified Fisher 2-4 and posterior circulation aneurysms were associated with greater hazards of *** In this comprehensive multicentre prospective-adjusted analysis of patients with sAH,hyponatraemia was investigated inconsistently and,for most patients,was not associated with changes in management or clinical outcome.T

关键词： admitted urine centre

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Dispersion and attenuation of torsional wave in a viscoelastic layer bonded between a layer and a half-space of dry sandy media

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Applied Mathematics and Mechanics(English Edition) 2017年第9期38卷 1313-1328页

作者： P.ALAM s.kundu s.GUPTA Department of Applied Mathematics Indian Institute of Technology(Indian School of Mines)Dhanbad 826004JhrkhandIndia

Propagation of a torsional wave in a doubly-layered half-space structure of an initially stressed heterogeneous viscoelastic layer sandwiched between a layer and a half-space of heterogeneous dry sandy media is studied. A closed form complex expression for the velocity profile is obtained under effective boundary conditions. The real part of the complex expression provides a dispersion equation, and the imaginary part yields a damping equation. The derived dispersion and damped equations are in well agreement with the classical Love wave condition. In addition, to study the effect of the dissipation factor, the attenuation coefficient, the sandy parameters, the initial stress, the hetero- geneity parameters, and the thickness ratio parameter, some noteworthy contemplations are made by numerical calculations and graphical visuals. The results of this paper may present a deeper insight into the behaviour of propagation phenomena in heterogeneous viscoelastic and heterogeneous dry sandy materials that can provide a theoretical guide for the design and optimization in the field of earthquake engineering. The study also reveals that the presence of a damping part due to viscoelasticity affects the torsional wave propagation significantly.

关键词： attenuation dissipation viscoelastic sandy heterogeneous initial stress,phase damping

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Viscous cosmology in holographic dark energy with Granda–Oliveros cut-off

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Communications in Theoretical Physics 2023年第2期75卷 144-156页

作者： simran Kaur C P singh Department of Applied Mathematics Delhi Technological UniversityBawana RoadDelhi-110042India

We study the effect of bulk viscosity on holographic dark energy(HDE)with Granda–Oliveros infra-red *** focus on a generalized form of the bulk viscous coefficient which successfully describes the present-day evolution of the *** observe that the model with bulk viscosity provides an elegant description of the early and late-time evolution of the *** constrain the model through the combined observational data of the strong Lensing system(sLs),measurements of Hubble parameter,Type Ia supernova data of Pantheon sample and local H_(0)measured by *** best-fit values obtained from two different combinations of data,we estimate the present value of Hubble’s constant H_(0)=71.567-0.848+1.448and H_(0)=69.197-1.924+1.563,the deceleration parameter q_(0)=-0.535-0.016+0.016and q_(0)=-0.536-0.016+0.016,and the equation of state w_(0)=-0.690-0.010+0.010and w_(0)=-0.691-0.011+0.011,*** HDE model with bulk viscosity exhibits the phase transition from decelerated epoch to accelerated epoch.A comparison of the model with the standardΛCDM model is discussed with the statefinder and cosmographic parameters.

关键词： viscosity holographic dark energy cosmology

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Interacting tachyonic scalar field

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Communications in Theoretical Physics 2021年第2期73卷 102-107页

作者： A kundu s D Pathak V K Ojha Department of Physies Lovely Professional UniversityPhagwaraPunjab144411India school of sciences SAGE University BhopalMadhya Pradesh462022India

We discuss the coupling between dark energy and matter by considering a homogeneous tachyonic scalar field as a candidate for dark *** obtained the functional form of scale factor by assuming that the coupling strength depends linearly on the Hubble parameter and energy *** also estimated the cosmic age of the Universe for different values of coupling constant.

关键词： dark energy dark matter scalar field achyonic scalar field

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An analytical study on the Rayleigh wave generation in a stratified structure

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Applied Mathematics and Mechanics(English Edition) 2020年第7期41卷 1039-1054页

作者： A.MANDI s.kundu P.PATI P.C.PAL Department of Mathematics and Computing Indian Institute of Technology(Indian School of Mines)Dhanbad 826004India

In this paper,an analytical method is used to investigate the Rayleigh wave generation in a stratified structure and the wave generation in a dry sandy layer constrained between the couple stress and inhomogeneous orthotropic *** study is devoted to analyzing the impact of various effective parameters associated with the media on the phase velocities of the *** displacement components for each medium are derived by implementing the separable variable *** frequency equa-tion is secured by using the displacement components in the boundary conditions,imposed at the interfaces between the layer and ***,the secured equation is the relation between the phase velocity and the wave *** computations are performed,and graphical representations are demonstrated between the phase velocity and the wave number for both phase velocities with different values of the *** comparison between the phase velocities is observed for the same value of each pa-rameter.

关键词： Rayleigh wave dry sandy layer couple stress orthotropic phase velocity wave number

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Influence of linearly varying density and rigidity on torsional surface waves in inhomogeneous crustal layer

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Applied Mathematics and Mechanics(English Edition) 2012年第10期33卷 1239-1252页

作者： s.GUPTA s.KVIsHWAKARMA D.K.MAJHI s.kundu Department of Applied Mathematics Indian School of Mines

The present work deals with the possibility of propagation of torsional surface wave in an inhomogeneous crustal layer over an inhomogeneous half space. The layer has inhomogeneity which varies linearly with depth whereas the inhomogeneous half space exhibits inhomogeneity of three types, namely, exponential, quadratic, and hyperbolic discussed separately. The dispersion equation is deduced for each case in a closed form. For a layer over a homogeneous half space, the dispersion equation agrees with the equa- tion of the classical case. It is observed that the inhomogeneity factor due to linear variation in density in the inhomogeneous crustal layer decreases as the phase velocity increases, while the inhomogeneity factor in rigidity has the reverse effect on the phase velocity.

关键词： torsional wave phase velocity crustal layer exponential quadratic,hyperbolic

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Periodontal conditions and treatment in urban and rural population of West Bengal,India

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Asian Pacific Journal of Tropical Medicine 2010年第2期3卷 152-157页

作者： Mehta R kundu D Chakrabarty s Bharati P Department of Periodontia Dr.R.Ahmed Dental College & Hospital Biological Anthropology Unit Indian Statistical Institute

Objective:To search adequate epidemiological data on periodontal conditions for the planning of oral health programs in Indian population,and to determine the prevalence of periodontal diseases,in regards to age and gender of urban and rural population in West ***. Methods:22 542 subjects aged 15 years onwards,representative of rural and urban areas of West Bengal were examined for their periodontal conditions using the community periodontal index(CPI).Results:supra and/or sub gingival calculus dominated as the most frequent score (score 2) among males(76.51%) and females(76.58%),which was least affected in young age group and higher in rural *** of highest score were significant(Ps(Psextants affected by scores 1,2,3,& 4 were more in the rural *** treatment needed was predominantly typeⅡ(scaling and improved oral hygiene).Conclusions: The severe periodontal condition(score 2,3 and 4) is observed among rural males in older age group more than its urban counterparts of West Bengal,India.

关键词： Periodontal diseases Treatment needs Urban and rural population Age group Gender

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Modeling a Novel Hyper-Parameter Tuned Deep Learning Enabled Malaria Parasite Detection and Classification

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Computers, Materials & Continua 2023年第12期77卷 3289-3304页

作者： Tamal Kumar kundu Dinesh Kumar Anguraj s.V.sudha Department of Computer science&Engineering Koneru Lakshmaiah Education FoundationVaddeswaramAndhra PradeshIndia Department of Artificial Intelligence and Data science KPR Institute of Engineering and TechnologyCoimbatoreTamil Nadu641407India

A theoretical methodology is suggested for finding the malaria parasites’presence with the help of an intelligent hyper-parameter tuned Deep Learning(DL)based malaria parasite detection and classification(HPTDL-MPDC)in the smear images of human peripheral *** existing approaches fail to predict the malaria parasitic features and reduce the prediction *** trained model initiated in the proposed system for classifying peripheral blood smear images into the non-parasite or parasite classes using the available online *** Adagrad optimizer is stacked with the suggested pre-trained Deep Neural Network(DNN)with the help of the contrastive divergence method to *** features are extracted from the images in the proposed system to train the DNN for initializing the visible *** smear images show the concatenated feature to be utilized as the feature vector in the proposed ***,hyper-parameters are used to fine-tune DNN to calculate the class labels’*** suggested system outperforms more modern methodologies with an accuracy of 91%,precision of 89%,recall of 93%and F1-score of 91%.The HPTDL-MPDC has the primary application in detecting the parasite of malaria in the smear images of human peripheral blood.

关键词： Malaria parasite classification hyper-parameter deep neural network the feature vector

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Propagation of Love waves in non-homogeneous substratum over initially stressed heterogeneous half-space

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Applied Mathematics and Mechanics(English Edition) 2013年第2期34卷 249-258页

作者： s.GUPTA D.K.MAJHI s.kundu s.K.VIsHWAKARMA Department of Applied Mathematics Indian School of Mines

The paper studies the propagation of Love waves in a non-homogeneous substratum over an initially stressed heterogeneous half-space. The dispersion equation of phase velocity is derived. The velocities of Love waves are calculated numerically as a function of kH and presented in a number of graphs, where k is the wave number, and H is the thickness of the layer. The case of Gibson＇s half-space is also considered. It is observed that the speed of Love waves is finite in the vicinity of the surface of the half-space and vanishes as the depth increases for a particular wave number. It is also observed that an increase in compressive initial stresses causes decreases of Love waves velocity for the same frequency, and the tensile initial stress of small magnitude in the half-space causes increase of the velocity.

关键词： Love waves initial stress heterogeneous half-space Gibson's half-space,dispersion equation phase velocity

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Electroosmotic oscillatory flow of micropolar fluid in microchannels:application to dynamics of blood flow in microfluidic devices

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Applied Mathematics and Mechanics(English Edition) 2014年第6期35卷 749-766页

作者： J.C.MIsRA s.CHANDRA G.C.sHIT P.K.kundu Department of Mathematics Institute of Technical Education and ResearchSiksha O Anusandhan University Department of Mathematics Jadavpur University

The electroosmotic flow of a micropolar fluid in a microchannel bounded by two parallel porous plates undergoing periodic vibration is studied. The equations for conservation of linear and angular momentums and Gauss＇s law of charge distribution are solved within the framework of the Debye-Hückel approximation. The fluid velocity and microrotation are assumed to depend linearly on the Reynolds number. The study shows that the amplitude of microrotation is highly sensitive to the changes in the magnitude of the suction velocity and the width of the microchannel. An increase in the micropolar parameter gives rise to a decrease in the amplitude of microrotation. Numerical estimates reveal that the microrotation of the suspended microelements in blood also plays an important role in controlling the electro-osmotically actuated flow dynamics in microbio-fluidic devices.

关键词： blood flow electrohydrodynamic effect microfluidics channel flow

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