检索结果-南通市图书馆

Buckling analysis of nanobeams with exponentially varying stiffness by differential quadrature method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第7期26卷 218-227页

作者： S Chakraverty laxmi Behera Department of Mathematics National Institute of Technology Rourkela

We present the application of differential quadrature（DQ） method for the buckling analysis of nanobeams with exponentially varying stiffness based on four different beam theories of Euler-Bernoulli, Timoshenko, Reddy, and *** formulation is based on the nonlocal elasticity theory of Eringen. New results are presented for the guided and simply supported guided boundary conditions. Numerical results are obtained to investigate the effects of the nonlocal parameter,length-to-height ratio, boundary condition, and nonuniform parameter on the critical buckling load parameter. It is observed that the critical buckling load decreases with increase in the nonlocal parameter while the critical buckling load parameter increases with increase in the length-to-height ratio.

关键词： differential quadrature method exponentially varying stiffness different beam theories

Vibration and buckling analyses of nanobeams embedded in an elastic medium

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第9期24卷 489-496页

作者： S Chakraverty laxmi Behera Department of Mathematics National Institute of Technology Rourkela

Boundary characteristic orthogonal polynomials are used as shape functions in the Rayleigh–Ritz method to investigate vibration and buckling of nanobeams embedded in an elastic medium. The present formulation is based on the nonlocal Euler–Bernoulli beam theory. The eigen value equation is developed for the buckling and vibration analyses. The orthogonal property of these polynomials makes the computation easier with less computational effort. It is observed that the frequency and critical buckling load parameters are dependent on the temperature, elastic medium, small scale coefficient,and length-to-diameter ratio. These observations are useful in the mechanical design of devices that use carbon nanotubes.

关键词： Rayleigh–Ritz method boundary characteristic orthogonal polynomials nonlocal elasticity theory Euler–Bernoulli beam theory

Effect of growth on wood traits in seed-raised plantations of Dalbergia sissoo Roxb.

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2015年第1期26卷 241-245页

作者： Pramod Pande laxmi Rawat Forest Research Institute

We studied the effect of growth on wood anatomical dimensions and specific gravity of seed-raised plantation wood of Dalbergia sissoo with twelve trees of different diameters and similar ages. Fiber length ranged from 925 to1,287 lm, fiber-diameter was 19–23 lm, wall thickness was4.2–5.4 lm, vessel-element-length was 152–188 lm, vesselelement-diameter was 152–200 lm, and specific gravity was0.59–0.72. Growth parameters including tree height, diameter at breast height, net primary productivity and net ecosystem productivity were significantly and positively *** parameters showed non-significant positive relationships with fiber-length, fiber diameter, wall thickness, vessel element length, and vessel element diameter. The trend of wood traits increased with growth. Specific gravity showed non-significant negative relationships with growth parameters. Although the growth rate had varied relationships with wood properties, as reported by various workers, the wood element dimensions showed no significant relationship with growth parameters and there was little effect of growth rate on wood traits in seed-raised plantation of D. sissoo.

关键词： Fiber dimensions Vessel-element dimensions Specific gravity Growth parameters

Pulmonary capillary hemangiomatosis or hepatopulmonary syndrome in a patient with calcinosis,Raynaud’s phenomenon,esophageal dysmotility,sclerodactyly and telangiectasia syndrome?

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2020年第2期133卷 243-244页

作者： Bijaya laxmi Shrestha Ying-Kang Jin Pediatric Department Guangzhou Medical UniversityGuangzhouGuangdong 510623China Pediatric Pulmonary Department Guangzhou Women and Children’s Medical CenterGuangzhou Medical UniversityGuangzhouGuangdong 510623China

To the Editor:We were interested in the article,which reported a woman with calcinosis,Raynaud’s phenomenon,esophageal dysmotility,sclerodactyly and telangiectasia(CREST)syndrome who developed progressive dyspnea on exertion and was later diagnosed with pulmonary capillary hemangiomatosis(PCH)that was confirmed by an open lung biopsy.[1]We would like to remark that the diagnosis of PCH is inconclusive from just history,treatment,and histological *** case also does not specify a clear connection between PCH and CREST syndrome;therefore,we believe we need to explore another possible disease association.

关键词： esophageal motility diagnosis

Latitudinal fluctuation in global concentration of CO2 and CH4 from shortwave infrared spectral observation by GOSAT during COVID-19

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2021年第12期14卷 1882-1896页

作者： laxmi Kant Sharma Rajani Kant Verma Department of Environmental Science School of Earth SciencesCentral University of RajasthanAjmerIndia

Various countries have rapidly implemented strict actions to slow the blowout of *** events were dis-regarded,and anthropogenic activities such as industrial and transport systems were at a *** countries were on lockdown,including the largest emitters of carbon *** to these lockdowns,anthropogenic activities have been reduced and reported that air quality improves at a regional scale in many countries,including ***,the current study using Greenhouse Gases Observing Satellite(GOSAT/IBUKI)datasets to monitor the fluctuation of the average global concentration of dry mole fractions of atmospheric Methane(CH_(4))and Carbon Dioxide(CO_(2))during these pandemic lockdowns from January to June *** emphasize no significant reduction in the average concentration of dry mole fractions of atmospheric CH_(4) over the globe,but a minor reduction was observed in global CO_(2) *** average concentration of both gases compares at each ten-degree *** study reveals that,against the regional breakdowns,these short time lockdowns are not enough to control the concentration of these greenhouse gases at a larger scale,such as 10°latitude and globally,except for a minor reduction in CO_(2) concentration.

关键词： Lockdown pandemic air quality greenhouse gas methane carbon dioxide

Characterization of saline soil for the halophytes of largest inland saline wetland of India using geospatial technology

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第4期41卷 1277-1291页

作者： Naik RAJASHREE Sharma laxmi KANT Singh AVINASH Department of Environmental Science School of Earth SciencesCentral University of RajasthanBandarsindriAjmer 305817India

About 23%of the surface area and 44%of the volume of all the lakes are occupied by saline lakes in the ***,agricultural diversion,illegal encroachment,pollution,and invasive species could cause these lakes to dry up completely or partially by *** saltpan encroachment is causing Sambhar,India’s largest saline lake,to shrink by 4.23%every *** study aims to characterize the soil parameters where halophytes are growing.A literature survey was conducted for halophytes and soil *** study area was divided into four zones for stratified random *** sampling was conducted in February *** soil indicators for halophyte selected were pH,electrical conductivity,moisture,salinity,organic carbon,and organic *** obtained results were interpolated in the geospatial platform for soil characteristic *** is found that no research is conducted on halophytes of the *** on soil are also inconsistent and only six common parameters could be *** show that the pH ranged 9.37-7.66,electrical conductivity was 16.1-0.38,moisture 23.37%-1.2%,organic carbon 3.29%-0.15%,organic matter 5.6%-0.2%,and salinity 8.86%-0.72%.Though these results show improved condition as compared to last few years,in long term,the lake is *** the UN Decade of Ecosystem Restoration(2021-2030),if these causes are not addressed,the ecosystem may completely dry up.

关键词： halophytes inland lakes saline wetlands soil geospatial mapping interpolation

Flotation tree analysis for recovery of sillimanite from red sediments

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2015年第5期25卷 843-848页

作者： laxmi T. Rao R.Bhima Advanced Materials Technology Department Institute of Minerals & Materials Technology Aryan Institute of Engineering and Technology Bijupatnaik University of Technology

In this paper an attempt is made to recover sillimanite by flotation tree analysis process and conventional flotation process from non magnetic fraction of red *** experimental results of both the processes are *** data reveal that the deslimed sample contains 33.2%(by weight) total heavy minerals and out of which the sillimanite mineral content is 3.6%(by weight).It is observed that flotation tree analysis needs 10 cells to get five output products and where as conventional flotation process needs 15 cells to recover similar grade of five output ***,flotation tree analysis is not only economic process but also efficient process(to say efficient process,the tree analysis product should be higher grade).

关键词： Tree analysis Flotation Red sediment Sillimanite

Recovery of Total Heavy Minerals from Badlands of Basanputti Village,Odisha

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2012年第6期23卷 892-899页

作者： T laxmi Rajalaxmi Mohapatra R Bhima Rao Institute of Minerals and Materials Technology Council of Scientific and Industrial ResearchBhubaneswar 751013India Aryan Institute of Engineering and Technology Bijupatnaik UniversityBhubaneswarIndia

The badland topography of Basanputti Village, Ganjam District, Odisha, possesses red sediments. The typical red sediment deposit, on average, consists of 71.8% total heavy minerals （THM）, out of which 62.1% are ilmenite. The other heavy minerals sillimanite, zircon, garnet, monazite, and pyriboles are in the order of abundance identified. In this present study, Mozley mineral separator has been used to recover THM from red sediment. Mineral separator results indicate that a product ob- tained contains 72.2% by weight with 94.4% THM and 95% recovery. The ilmenite concentrate recov- ered using dry low-intensity magnetic separator from the THM concentrate can be used in pigment in- dustries after suitable pyrometallurgical/chemical processing methods.

关键词： red sediment total heavy mineral (THM) Mozley mineral separator Perm roll mag-netic separator ilmenite zircon.

Soret and Dufour effects on unsteady MHD flow past an infinite vertical porous plate with thermal radiation

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2010年第12期31卷 1481-1496页

作者： S.R.VEMPATI A.B.laxmi-NARAYANA-GARI Department of Mathematics University College of ScienceOsmania University

The objective of the present study is to investigate the effect of flow parameters on the free convection and mass transfer of an unsteady magnetohydrodynamic flow of an electrically conducting, viscous, and incompressible fluid past an infinite vertical porous plate under oscillatory suction velocity and thermal radiation. The Dufour （diffusion thermo） and Soret （thermal diffusion） effects are taken into account. The problem is solved numerically using the finite element method for the velocity, the temperature, and the concentration field. The expression for the skin friction, the rate of heat and mass transfer is obtained. The results are presented numerically through graphs and tables for the externally cooled plate （Gr 〉 0） and the externally heated plate （Gr 〈 0） to observe the effects of various parameters encountered in the equations.

关键词： mass transfer magnetohydrodynamic flow vertical plate suction velocity,Soret and Dufour number thermal radiation finite element method